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2019.08.26_CCO.p12and11.1_CapeFearPFASLoadingReductionPlan The Chemours Company Fayetteville Works 22828 NC Highway 87 W Fayetteville, NC 28306 August 26, 2019 Sheila Holman Assistant Secretary for the Environment 1601 Mail Service Center Raleigh, NC 27699-1601 sheila.holman@ncdenr.gov Kemp Burdette Cape Fear River Watch 617 Surry Street Wilmington, NC 28401 (910) 762-5606 kemp@cfrw.us Re: Submission Pursuant to Consent Order Paragraphs 12 and 11.1 Dear Ms. Holman and Mr. Burdette, Chemours is pleased to submit the enclosed Cape Fear River PFAS Loading Reduction Plan, pursuant to paragraphs 12 and 11.1 of the Consent Order entered by the Superior Court for Bladen County on February 25, 2019. The Reduction Plan and its attachments were developed by our consultant, Geosyntec Consultants of NC, P.C. DEQ has approved Geosyntec as a third party for this work under the Consent Order. As we have previously reported, Chemours has already implemented several actions that have significantly reduced PFAS loadings originating from Fayetteville Works to the Cape Fear River. These actions have included, among others, the cessation of process wastewater discharges, installation of new air emissions controls, lining of the cooling water channel and sediment ponds, and groundwater extraction from three perched zone monitoring wells. The enclosed Reduction Plan proposes the implementation of seven additional actions to further reduce PFAS loadings to the River. Geosyntec has developed these recommended actions, and Chemours has agreed their implementation will support reducing loading to the River in accordance with Consent Order paragraph 12. The seven proposed actions are: 1. Capture and Treat Old Outfall 002 Water 2. Capture and Treat Groundwater from Seeps 3. Targeted Sediment Removal from Conveyance Network 4. Develop a Stormwater Pollution Prevention Plan 5. Targeted Stormwater Source Control and/or Treatment 6. Decommission and Replace Remaining Portion of the Terracotta Pipe 7. Assess Potential for Groundwater Intrusion into Conveyance Network 2 The seven actions proposed in the enclosed Reduction Plan are supported by recent environmental characterization work and data analyses presented in four separate reports attached to the Reduction Plan. These attached reports are the 1) PFAS Mass Loading Model, 2) Seeps and Creeks Investigation Report, 3) Outfall 002 Assessment, and 4) Terracotta Pipe Grouting Report. The PFAS Mass Loading Model report includes the characterization of PFAS in downstream raw water intakes, pursuant to paragraph 11.1 of the Consent Order. We would also like to emphasize that our environmental data collection, characterization, and assessment efforts remain ongoing. Pursuant to paragraph 16 of the Consent Order, Chemours will be submitting before the end of this year a Corrective Action Plan, and in that Plan Chemours anticipates that it will propose additional actions to further reduce PFAS mass loading from Fayetteville Works to the Cape Fear River based on the outcome of our ongoing efforts. *** As specified in the Consent Order, Chemours is simultaneously transmitting this submission to downstream public water utilities. We look forward to meeting with DEQ and Cape Fear River Watch soon to discuss this submission and the path forward for implementation. Sincerely, Brian D. Long Plant Manager Chemours – Fayetteville Works Enclosure Cape Fear River PFAS Loading Reduction Plan and Attachments 3 Cc: William F. Lane, DEQ Francisco Benzoni, NC DOJ Michael Abraczinskas, DAQ Michael Scott, DWM Linda Culpepper, DWR David C. Shelton, Chemours John F. Savarese, WLRK Geoff Gisler, SELC Downstream Public Water Utilities CAPE FEAR RIVER PFAS LOADING REDUCTION PLAN Chemours Fayetteville Works, NC Prepared for The Chemours Company FC, LLC 22828 NC Highway 87 Fayetteville, NC 28306 Prepared by Geosyntec Consultants of NC, P.C. 2501 Blue Ridge Road, Suite 430 Raleigh, NC 27607 Geosyntec Project Number TR0795 August 26, 2019 Reduction Plan ii August 26, 2019 TABLE OF CONTENTS EXECUTIVE SUMMARY .............................................................................................. v 1 INTRODUCTION ................................................................................................ 1 2 SITE SETTING AND PFAS MASS LOADING MODEL ASSESSMENT ....... 3 2.1 Site Setting ................................................................................................... 3 2.2 PFAS at the Site ........................................................................................... 9 2.3 PFAS Mass Loading Model ...................................................................... 10 2.4 Modeled Estimates of Downstream HFPO-DA Concentrations ............... 14 3 COMPLETED REDUCTION ACTIONS .......................................................... 16 4 CONSENT ORDER PARAGRAPH 12 PROPOSED ACTIONS ..................... 18 4.1 Overview of Proposed Actions .................................................................. 18 4.2 Planned and In-Progress Additional Assessment Activities ...................... 19 4.3 Detailed Descriptions of Proposed Actions ............................................... 21 Action 1: Capture and Treat Old Outfall 002 Water ................................ 21 Action 2: Capture and Treat Seeps ........................................................... 21 Action 3: Targeted Sediment Removal from Conveyance Network ........ 22 Action 4: Develop and Implement a Stormwater Pollution Prevention Plan (SWPPP) ................................................................................................... 23 Action 5: Implement Targeted Stormwater Source Control and/or Treatment .................................................................................................. 24 Action 6: Decommission and Replace Remaining Portion of the Terracotta Pipe .......................................................................................... 25 Action 7: Assess Potential for Groundwater Intrusion into Conveyance Network .................................................................................................... 25 5 PARAGRAPH 12(D) OUTFALL 002 ............................................................... 28 6 SUMMARY ........................................................................................................ 32 7 REFERENCES ................................................................................................... 33 Reduction Plan iii August 26, 2019 LIST OF TABLES Table 1: Mass Loading Model Total Table 3+ PFAS including HFPO-DA Contributions per Pathway .................................................................................................................... 13 Table 5: Proposed Paragraph 12 PFAS Loading Reduction Actions ............................. 18 Table 6: Potential Outfall 002 Control Approaches ....................................................... 29 Table 7: Estimated Outfall 002 HFPO-DA Reductions by Conveyance Network Flow Component ...................................................................................................................... 30 LIST OF FIGURES Figure 1: Cape Fear River Watershed and Downstream Intakes ...................................... 4 Figure 2: Site Location ..................................................................................................... 5 Figure 3: Site Conveyance Network ................................................................................. 6 Figure 4: Site Geology Cross-Section adapted from Parsons, 2018. ................................ 8 Figure 5: PFAS Transport Pathways Conceptual Diagram (not to scale) ...................... 12 Figure 6: Modeled and Measured HFPO-DA Concentration Time Series at Kings Bluff Intake Canal. ................................................................................................................... 15 Figure 7: Lower and Best Estimates of HFPO-DA Load Reductions in Outfall 002 Compared to 2018 Loads. ............................................................................................... 31 LIST OF ATTACHMENTS ATTACHMENT 1: Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes. ATTACHMENT 2: Seeps and Creeks Investigation Report ATTACHMENT 3: Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge and Evaluation of Potential Control Options ATTACHMENT 4: Decommissioning Summary of Grouting of East-West Section of Terracotta Pipe from Chemours Monomers IXM Area ATTACHMENT 5: HFPO-DA Loading Reductions Estimate Reduction Plan iv August 26, 2019 ACRONYMS AND ABBREVIATIONS % Percent CAP Corrective Action Plan CFRW Cape Fear River Watch cfs Cubic Feet Per Second DFSA Difluoro-sulfo-acetic acid EPA United States Environmental Protection Agency EPA RTC NC EPA Research Triangle Park North Carolina ft feet ft bgs feet below ground surface HDPE high density polypropylene HFPO Hexafluoropropylene Oxide HFPO-DA Hexafluoropropylene Oxide Dimer Acid HP/EC hydraulic profiling and electrical conductivity L/s liters per second lbs/yr pounds per year mg/s milligrams per second MMF Difluoromalonic acid MSL Mean Sea Level MTP Perfluoro-2-methoxypropanoic acid NCDEQ North Carolina Department of Environmental Quality ng/L nanograms per liter NCCW Non Contact Cooling Water NVHOS Perfluoroethoxysulfonic acid PFAS per- and polyfluoroalkyl substances PFMOAA perfluoro-1-methoxyacetic acid PMPA Perfluoromethoxypropyl carboxylic acid PPA Area Polymer Processing Acid Area PPF Acid Perfluoropropionic acid SWPPP Stormwater Pollution Prevention Plan TA TestAmerica Laboratories, Inc. WWTP Wastewater treatment plant Reduction Plan v August 26, 2019 EXECUTIVE SUMMARY Geosyntec Consultants of NC, P.C.(Geosyntec) has prepared this Cape Fear River PFAS Reduction Plan (Reduction Plan) for The Chemours Company FC, LLC (Chemours) pursuant to Paragraph 12 of the Consent Order among Chemours, the North Carolina Department of Environmental Quality (NCDEQ) and Cape Fear River Watch (CFRW). Geosyntec has developed the proposed recommended actions detailed in this plan and Chemours anticipates that following NCDEQ and CFRW review, the parties will come to an agreement to amend the Consent Order to incorporate the proposed recommended actions. This Reduction Plan proposes Chemours implement seven actions, listed in the table below within five years of Consent Order Amendment, to reduce mass loading of PFAS originating from the Chemours Fayetteville Works Facility (the Site). Four of these actions would be implemented within two years of Consent Order Amendment and three of the actions would be implemented within five years of Consent Order Amendment (assuming all necessary permits and authorizations are provided in a timely manner). The actions proposed here also support the requirements of Consent Order Paragraph 16 pursuant to which Chemours will submit a Corrective Action Plan for Groundwater by December 31, 2019. As part of the Corrective Action Plan submittal, Chemours anticipates that it will propose additional actions to reduce PFAS mass loading to the Cape Fear River based on the outcome of environmental characterization efforts and quantitative analyses presently on-going in support of the Corrective Action Plan preparation. Proposed Actions to Reduce PFAS Loading to Cape Fear River Approximate Years to Implement 1) Capture and Treat Old Outfall 002 Water 2 2) Capture and Treat Groundwater from Seeps 5 3) Targeted Sediment Removal from Conveyance Network 1 4) Develop a Stormwater Pollution Prevention Plan (SWPPP) 1 5) Targeted Stormwater Source Control and/or Treatment 4 6) Decommission and Replace Remaining Portion of the Terracotta Pipe 2 7) Assess Potential for Groundwater Intrusion into Conveyance Network 5 Reduction Plan 1 August 26, 2019 1 INTRODUCTION Geosyntec has prepared this per- and polyfluoroalkyl substances (PFAS) reduction plan (Reduction Plan) pursuant to Paragraph 12 of the February 25, 2019 Consent Order among Chemours, the North Carolina Department of Environmental Quality (NCDEQ) and Cape Fear River Watch (CFRW). To date Chemours has already implemented a number of actions which have reduced PFAS loading originating from the Chemours Fayetteville Works Site (the Site). Specifically, Hexafluoropropylene Oxide Dimer Acid (HFPO-DA) load has been reduced by over 95% downstream in the Cape Fear River as described later in Section 3. This Reduction Plan proposes seven additional actions to further reduce the remaining HFPO-DA and PFAS loadings to the Cape Fear River. Geosyntec has developed these recommended actions and Chemours has agreed their implementation will support reducing loading to the Cape Fear River in accordance with Consent Order Paragraph 12. Four of the actions proposed in the Reduction Plan would be completed within two years of Consent Order Amendment and three of the actions would be completed within five years of Consent Order Amendment (assuming all necessary permits and authorizations are timely provided). Taken together these actions are estimated to reduce PFAS loading in the Cape Fear River of Table 3+ compounds, the compounds identified at the Site, by greater than 50% from present loading (based on mass loading results). In addition to Old Outfall 002 and the Seeps, onsite groundwater discharge contributes relatively more mass to the Cape Fear River than the remaining other pathways. At this time, assessment of onsite groundwater discharge is ongoing. The results of this ongoing assessment will be presented in the Consent Order paragraph 18 assessment report due September 30, 2019. Onsite groundwater will also be addressed in the Consent Order paragraph 16 Corrective Action Plan due December 31, 2019. The actions proposed in this Reduction Plan are supported by recent environmental characterization work and data analyses presented in four separate reports attached to this Reduction Plan. These reports are: • “PFAS Mass Loading Model” – Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes (Attachment 1): This report identifies transport pathways that contribute measurable PFAS load to the Cape Fear River by estimating total PFAS mass loading originating from the facility to the Cape Fear River and comparing these estimates to empirically measured PFAS loading in the Cape Fear River. The results of the modeling analysis are used in this Reduction Plan to support Reduction Plan 2 August 26, 2019 the selection actions proposed. The PFAS Mass Loading Model Report also presents a Characterization of PFAS at downstream raw water intakes pursuant to Paragraph 11.1 of the Consent Order. • Seeps and Creeks Investigation Report (Attachment 2): This document presents a summary of recent environmental characterization work and data that are used in the PFAS Mass Loading Model. • “Outfall 002 Assessment” – Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge and Evaluation of Potential Control Options (Attachment 3): This document presents data and a technical analysis related to Outfall 002 to support actions proposed in this Reduction Plan, along with an evaluation of potential reductions of HFPO-DA and perfluoro-1- methoxyacetic acid (PFMOAA) from eight potential control approaches (nine including in-progress air emissions reductions). • “Terracotta Pipe Grouting Report” – Decommissioning Summary of Grouting of East-West Section of Terracotta Pipe from Chemours Monomers IXM Area (Attachment 4): This document summarizes the recent work completed at the Site to decommission a portion of the terracotta pipe. • HFPO-DA Loading Reductions Estimate (Attachment 5): This document presents an assessment of HFPO-DA loading reductions since June 2017 at Outfall 002, to the Cape Fear River and to the environment. The remainder of this report is organized as follows: • Section 2: Site Setting and PFAS Mass Loading Model Assessment – This section presents an overview description of the facility, environmental setting, PFAS mass loading pathways to the Cape Fear River and results of the PFAS Mass Loading Model. • Section 3: Completed Reduction Actions – This section lists actions Chemours has already undertaken to reduce PFAS loading the environment and the Cape Fear River. • Section 4: Consent Order Paragraph 12 Proposed Actions – This section lists the proposed actions, including interim benchmarks, to reduce PFAS loading originating from the facility and reaching the Cape Fear River. • Section 5: Paragraph 12(d) Outfall 002 – Pursuant to Consent Order Paragraph 12(d) this section evaluates whether an 80% reduction in HFPO- DA and (PFMOAA) in Outfall 002 is technologically and/or economically feasible within 2 years of Consent Order Amendment. Reduction Plan 3 August 26, 2019 • Section 6: Summary – This section summarizes the Reduction Plan actions presented in this document. • Section 7: References – This section lists documents referenced. 2 SITE SETTING AND PFAS MASS LOADING MODEL ASSESSMENT This section presents an overview description of the Site Setting and reviews the distribution of Site Associated PFAS and the Mass Loading Model results. 2.1 Site Setting The Site is located on the Cape Fear River 7-miles upstream of the Bladen Bluffs water intake and 55-miles upstream of the Kings Bluff Intake Canal as shown on Figure 1. The Site is situated in the northwestern portion of Bladen County and southern portion of Cumberland county about 20 miles from the Fayetteville, NC city center. There are several operating areas at the site as shown in Figure 2. Chemours operates two manufacturing areas on the Site, the Chemours Monomers IXM Area and the Polymer Processing Aid Area (PPA Area). Chemours also operates the wastewater treatment plant (WWTP) and Power Area; filtered water and demineralized water are produced in the Power Area. Two tenants also operate on the Site; Kuraray America Inc. (Kuraray) and E.I. du Pont de Nemours and Company (DuPont). The land surface is relatively flat in the manufacturing areas of the Site and slopes down a bluff with about a 100-foot change in elevation towards the Cape Fear River on the east side of the Site. To the north of the Site, the property slopes towards Willis Creek, which is a tributary that discharges to the Cape Fear River. To the south of the manufacturing area is the Old Outfall Channel, which also discharges to the Cape Fear River. Farther south, off the Site, is Georgia Branch Creek which is a tributary to the Cape Fear River. River water used at the Site as non-contact cooling water (NCCW) is transmitted through the Site Conveyance Network to Outfall 002 through a series of channels and piping sections shown in Figure 3. The Site Conveyance Network also transmits stormwater and treated process water from the Waste Water Treatment Plant. There are five sections of the Site Conveyance Network identified in Figure 3: • The Wood Lined Trench which transmits NCCW from Kuraray operations and stormwater from the western portion of the Site; • The Cooling Water Channel which transmits NCCW from the Chemours Monomers IXM Area and stormwater from the northeast portion of the Site; Reduction Plan 4 August 26, 2019 • The Wastewater Treatment Plant Discharge which transmits treated sanitary, some NCCW, Kuraray and DuPont process waters, and some stormwater; • The DuPont Area Ditches which transmit NCCW for DuPont operations and stormwater from the southeast portion of the Site; and • The Open Channel to Outfall 002 which transmits the combined flows from the previous sections to Outfall 002 with some additional stormwater additions. Figure 1: Cape Fear River Watershed and Downstream Intakes Reduction Plan 5 August 26, 2019 Figure 2: Site Location Reduction Plan 6 August 26, 2019 Figure 3: Site Conveyance Network Site Geology As described by Parsons (2018), Bladen County is within the Coastal Plain Physiographic Province, which consists of a seaward thickening wedge of sedimentary deposits ranging in age from Cretaceous to Recent. Paleozoic metamorphic and igneous rocks underlie these deposits. The Site is underlain by the Black Creek Formation, which is characterized by lignitic clay with thin beds and laminae of fine-grained micaceous sand as well as thick lenses of cross-bedded sand. The upper portion of the formation may also contain glauconitic, fossiliferous clayey sand lenses. The Black Creek Formation and surficial deposits are the principal potable water aquifers in the region. Based on the lithology logged during onsite investigations, the Site is underlain by a fine- to medium-grained sand unit with thin discontinuous interbedded silt/clay lenses. The Reduction Plan 7 August 26, 2019 sand extends to a depth of approximately 65 feet below ground surface (ft bgs) (elevation of +80 feet MSL). The saturated portion of this unit has been identified as the Surficial Aquifer. Beneath this unit is a 7- to 15-foot-thick, laterally-continuous dense clay that has been identified as the Black Creek Confining Unit. The elevation of this unit (approximately +65 to +77 ft MSL) indicates that it, too, should outcrop along the bluff face adjacent to the Cape Fear River, and potentially along the embankment near Willis Creek. Beneath this confining unit is the Black Creek Aquifer, which is approximately 8 to 20 ft thick and is encountered at depth between 80 and 100 ft bgs (elevation of approximately +45 to +65 ft MSL) at the top of the bluff. Beneath this aquifer is a massive dense clay (with minor sand stringers) that has been identified as the Upper Cape Fear Confining Unit. This unit was not fully penetrated at the Site; however, it extended to at least 200 ft bgs (elevation of -55 ft MSL). Beneath the manufacturing area, the uppermost sand unit is locally bisected by an aerially extensive stiff clay lens. This clay lens is limited in lateral extent to the east, north and south by local topography and pinches out (terminates) to the west of the manufacturing area. The depth to the top of the clay lens is approximately 15 to 18 ft bgs. The clay lens becomes thinner moving west across the manufacturing area and ranges from approximately one foot to approximately 19 feet (ft) thick. Site Hydrogeology The hydrogeology of the Site includes a perched water zone and two aquifers; the Perched Zone, the Surficial Aquifer and the Black Creek Aquifer as shown in Figure 4. The Perched Zone is aerially limited and generally is located above the top of a discontinuous clay layer present in the manufacturing area. Based on recent investigations and on-going evaluations, the Perched Zone may have been influenced by seepage of water through the previously unlined sedimentation basins and infiltration of non-contact cooling water from previously unlined drainage ditches. In 2018, the sedimentation basins and Cooling Water Channel were lined. Where perched water is present, it is encountered from between 6 to 20 ft bgs. The lateral extent of the Perched Zone is controlled by topography and the lateral extent of the clay lens. The Surficial and Black Creek Aquifers are mostly separated by the Black Creek confining unit, a clay layer. This clay layer is not fully confining as geological and geochemical data indicate water and PFAS transfer has occurred from the Surficial Aquifer to the Black Creek Aquifer. The Black Creek Aquifer is the uppermost identified regional hydrogeologic unit. Flow in the Black Creek Aquifer is toward the Cape Fear River. The Cape Fear River stage is also lower than the base of the Black Creek Aquifer, indicating that the Cape Fear River is also a discharge boundary for the Black Creek Aquifer. Reduction Plan 8 August 26, 2019 Below the Black Creek Aquifer is the Upper Cape Fear Confining Unit. This clay is over 30-ft thick and is an aquitard to potential further downward flow based on limited onsite geological borings and USGS groundwater wells at the Site that demonstrate minimal hydraulic connection between the Black Creek Aquifer and the Upper Cape Fear Aquifer. Figure 4: Site Geology Cross-Section adapted from Parsons, 2018. The Surficial Aquifer is a shallow unconfined aquifer encountered at approximately 50 ft bgs. Groundwater elevations range from approximately 100 to 107 ft above MSL in the western areas of the Site to approximately 93 ft above MSL in the eastern areas of the Site, indicating that groundwater flow is generally toward the Cape Fear River. The Cape Fear River stage is typically near +30 ft MSL, which is lower than the base elevation of the Surficial Aquifer, indicating that the Cape Fear River is a discharge boundary for the Surficial Aquifer. Based on groundwater elevations near Willis Creek, portions of the creek are “gaining” (groundwater discharges to the creek) and portions are “losing” (surface water infiltrates to the underlying groundwater). Georgia Branch Creek also appears to be a gaining stream near where State Road 1303 crosses Highway 87. The Surficial and Black Creek Aquifers are mostly separated by the Black Creek confining unit, a clay layer. This clay layer is not fully confining as geological and Reduction Plan 9 August 26, 2019 geochemical data indicate water and PFAS transfer has occurred from the Surficial Aquifer to the Black Creek Aquifer. The Black Creek Aquifer is the uppermost identified regional hydrogeologic unit. Flow in the Black Creek Aquifer is toward the Cape Fear River. The Cape Fear River stage is also lower than the base of the Black Creek Aquifer, indicating that the Cape Fear River is also a discharge boundary for the Black Creek Aquifer. Below the Black Creek Aquifer is the Upper Cape Fear Confining Unit. This clay is over 34-ft thick and is an aquitard to potential further downward flow based on limited onsite geological borings and USGS groundwater wells at the Site that demonstrate minimal hydraulic connection between the Black Creek Aquifer and the Upper Cape Fear Aquifer. Groundwater in the Perched Zone, and the Surficial and Black Creek Aquifers at Site flow towards the bluff. As groundwater reaches the bluff above the Cape Fear River, it is expressed at ground surface as seeps. The confluence of the “seeps” create four channelized flows of expressed groundwater towards the river, designated as Seeps A, B, C, and D. The Cape Fear River The Site is located adjacent to the west bank of the Cape Fear River and draws water for use at the Site, with more than 95% of the water used as non-contact cooling water and then returned to the river. The Cape Fear River is also a water source for downstream communities served by raw water intakes located at Bladen Bluffs and Kings Bluff Intake Canal, located approximately 5 miles and 55 miles downstream. Drinking water sourced from the Cape Fear River contains certain chemicals from several sources including 1,4- dioxane, trihalomethanes associated with bromide content in raw river water, pharmaceuticals, personal care products, endocrine disrupting chemicals, and PFAS. A brief description of these chemicals and their presence in the Cape Fear River was reported previously (Geosyntec, 2018). 2.2 PFAS at the Site PFAS is a term used for a group of man-made carbon-based chemicals composed of a fully or partially fluorinated chain of carbon atoms (referred to as a “tail”) at one end of the carbon chain and a nonfluorinated, polar functional group (referred to as a “head”) at the other end. Recent estimates (Wang et. al., 2017) suggest over 3,000 PFAS are or have been produced across various industries and for various applications. Chemours manufactures per- and polyfluoroalkyl ether compounds and polymers at the Site. The PFAS originating from the Chemours Fayetteville Works Site are characterized primarily by the presence of ether bonds, i.e. two carbons connected by an oxygen atom. To date Reduction Plan 10 August 26, 2019 twenty-four (24) PFAS compounds that are present in Site process water have been identified and had reference standards produced (Geosyntec, 2019a). Of these twenty- four (24) compounds, analytical methods exist for twenty (20), the Table 3+ SOP method, with methods presently being developed for the remaining four (4) compounds [Difluoro- sulfo-acetic acid (DFSA), Difluoromalonic acid (MMF), Perfluoro-2-methoxypropanoic acid (MTP) and Perfluoropropionic acid (PPF Acid)]. PFAS from other sources are also present in the Cape Fear River (Geosyntec, 2018). The current grouping of Table 3+ PFAS, including HFPO-DA which can also be analyzed by other methods, is used to represent PFAS loads originating from the facility. In site groundwater and process water Table 3+ PFAS constitute over 99% of the quantitated PFAS mass (Attachment 1 and 2). PFAS associated with the Site have been released through a range of pathways, including: (i) to air via air emissions, (ii) to surface water via Outfall 002, and (iii) to soil and groundwater from piping that has either been replaced or will be replaced as described later in this Reduction Plan. These PFAS releases have resulted in PFAS being detected in environmental media both onsite and offsite. Geosyntec developed a mass loading model (Attachment 1) pursuant to Consent Order Paragraph 12 that assesses relative PFAS loading contributions from nine different transport pathways. 2.3 PFAS Mass Loading Model The PFAS Mass Loading Model assesses the contribution of different transport pathways to overall mass loading of PFAS originating from the facility to the Cape Fear River. Pathways contributing to loading are shown in Figure 5 and listed below as follows: Transport Pathway 1: Upstream Cape Fear River and Groundwater – pathway is comprised of contributions from non-Chemours related PFAS sources on the Cape Fear River and tributaries upstream of the Site, and upstream offsite groundwater with Table 3+ compounds present from aerial deposition Transport Pathway 2: Willis Creek – Groundwater and stormwater discharge and aerial deposition to Willis Creek and then to the Cape Fear River Transport Pathway 3: Direct aerial deposition of PFAS on the Cape Fear River; Reduction Plan 11 August 26, 2019 Transport Pathway 4: Outfall 002 – Comprised of (i) water drawn from the Cape Fear River and used as non-contact cooling water, (ii) treated non-Chemours process water and (iii) Site stormwater which are then discharged through Outfall 002; Transport Pathway 5: Onsite Groundwater – Direct upwelling of site groundwater to Cape Fear River from Black Creek Aquifer; Transport Pathway 6: Seeps – Groundwater Seeps (currently identified seeps are A, B, C and D) above the Cape Fear River water level on the bluff face from the facility that discharge into the Cape Fear River; Transport Pathway 7: Old Outfall 002 – Groundwater discharge to Old Outfall 002 and stormwater runoff flows into the Cape Fear River; Transport Pathway 8: Adjacent and Downstream Groundwater – Offsite groundwater adjacent and downstream of the Site upwelling to the Cape Fear River; and, Transport Pathway 9: Georgia Branch Creek – Groundwater, stormwater discharge and aerial deposition to Georgia Branch Creek and then to the Cape Fear River. The PFAS Mass Loading Model Report (Attachment 1) estimated PFAS loading to the Cape Fear River using a combination of measured and estimated data to develop mass loading estimates by pathway. The recent investigations of the seeps and creeks at the Site (Attachment 2) are the basis for much of the measured data used in the mass loading model. The inputs used in the model (e.g. groundwater concentrations, seep flow rates, river flow rates, etc.,) are described in the PFAS Mass Loading Model Report (Attachment 1). The model was then calibrated and evaluated against observed downstream river PFAS mass loadings. The best calibrated version of the model was used to assign loadings coming for each of the nine transport pathways to the observed concentrations in the Cape Fear River. The model was calibrated using the sum of Table 3+ PFAS loadings. The sum of Table 3+ compounds was selected as the calibration parameter as the Table 3+ compounds represent greater than 99% of the PFAS mass quantitated in Site groundwater, seeps and the Old Outfall 002. Reduction Plan 12 August 26, 2019 Figure 5: PFAS Transport Pathways Conceptual Diagram (not to scale) The mass loading model estimated that the Old Outfall 002 and Seeps (Transport Pathways 7 and 6 respectively) have the highest contribution of Table 3+ PFAS mass loading to the Cape Fear River. As described in the mass loading model report (Attachment 1), these estimates are based on two mass loading characterization events (May and June 2019). These two pathways (Transport Pathways 7 and 6) combined are estimated to contribute greater than 50% of the loading to the Cape Fear River. Onsite groundwater is the next highest mass loading pathway to the Cape Fear River with estimated loadings between 17% to 22%. Reduction Plan 13 August 26, 2019 Table 1: Mass Loading Model Total Table 3+ PFAS including HFPO-DA Contributions per Pathway Pathway Total Table 3+ Estimated Loading Percentage per Pathway per Event May 2019 Event June 2019 Event [1] Upstream River Water and Groundwater 4% 15% [2] Willis Creek 10% 4% [3] Aerial Deposition on the River < 2% < 2% [4] Outfall 002 4% 7% [5] Onsite Groundwater 22% 17% [6] Seeps 32% 24% [7] Old Outfall 002 23% 29% [8] Offsite Adjacent and Downstream Groundwater < 2% < 2% [9] Georgia Branch Creek 4% 3% For all Transport Pathways, the loading estimates will vary over time due to a range of potential factors, including but not limited to: • Detections of PFAS at or near analytical practical quantitation limits have more variability; • Elevated method reporting limits; • Standard uncertainty (often ± 20%) in analytical laboratory results; • Flow rate estimates in the river, seeps, groundwater and creeks are over- or under- predicted compared to actual flow rates. Transport Pathway 1 (upstream river water and groundwater) may have additional variability due to the presence of three Table 3+ compounds, Byproduct 4, Byproduct 5 and (NVHOS), whose upstream load is not consistent with identified release pathways from the Site (Attachment 2). Analytical results from Byproduct 4 and 5 also had a consistent high bias based on data quality evaluations. These three compounds were detected in both the May and June events at locations upstream where no other Table 3+ compounds were detected, including PMPA, which has the highest offsite concentrations in the immediate area surrounding the Site. In upcoming quarterly sampling events, Chemours will collect Cape Fear River samples at these same upstream locations and additional locations to assess the spatial and temporal trends of these three compounds in the upstream Cape Fear River. Last, future events taken during, or immediately after, larger storm events may result in pathways with stormwater components potentially having higher mass loadings, i.e. variability, potentially from stormwater runoff. Reduction Plan 14 August 26, 2019 2.4 Modeled Estimates of Downstream HFPO-DA Concentrations The mass loading model simulates concentrations of PFAS originating from the Site at downstream intakes over time as shown in Figure 66 for Kings Bluff Intake Canal. This plot shows the measured concentrations of HFPO-DA from samples collected at Kings Bluff Intake Canal compared to modeled concentrations estimated from the mass loading model. To simulate the modeled time series, the model incorporated the twice weekly Outfall 002 sample concentration results, measured Outfall 002 flow rates and Cape Fear River flow volumes; all other loading parameters developed for the model as presented in the PFAS Mass Loading Model Report were kept constant. As Figure 6 results show modeled HFPO-DA results correspond to measured data. This suggests that the model is also a useful predictive tool to understand the benefit of potential PFAS mass loading reductions to river loads and concentrations. Reduction Plan 15 August 26, 2019 Figure 6: Modeled and Measured HFPO-DA Concentration Time Series at Kings Bluff Intake Canal. Modeled HFPO-DA concentrations are calculated based on calculated and estimated mass loadings from off-Site and onsite groundwater, nearby tributaries, Outfall 002, and Old Outfall 002. Reduction Plan 16 August 26, 2019 3 COMPLETED REDUCTION ACTIONS Actions already implemented by Chemours have reduced yearly HFPO-DA mass loadings from the facility to the environment by at minimum 5,150 pounds per year (lbs/yr) compared to pre-June 2017 emissions and discharges (Attachment 5). Specifically, air emission reductions to date, on an annualized basis for 2019, have resulted in an estimated yearly reduction of 2,150 pounds of HFPO-DA, a greater than 93% reduction. Cessation of Chemours process water discharge to Outfall 002 resulted in at minimum an estimated yearly reduction of 3,000 lbs/yr of HFPO-DA. These actions have reduced HFPO-DA mass loadings, through Outfall 002, by over 99% from June 2017 levels to 2018 levels (Attachment 5). This has resulted in a reduction of HFPO-DA loading in the Cape Fear River. Present estimates of HFPO-DA mass loading to the Cape Fear River from all pathways are between 64 and 129 pounds per year (lbs/yr). This represents upwards of a 95% reduction in mass loading to the Cape Fear River (Attachment 5). These reductions will be further enhanced by implementation of the Thermal Oxidizer by the end of 2019, which will control over 99.99% of PFAS emissions routed to it, and the actions proposed in this plan will further reduce HFPO-DA and other PFAS loadings to the environment. Chemours has also implemented multiple actions to further reduce loading of PFAS to the Cape Fear River including lining of the previously unlined portions of the Cooling Water Channel and sediment ponds as well as groundwater extraction from three perched zone monitoring wells. Specifically, in November 2018 Chemours lined the Cooling Water Channel surrounding the Monomers IXM Area and the sediment ponds to the west of the Monomers IXM Area to reduce infiltration of water to the Perched Zone. Over time, as the water table of the Perched Zone declines from these measures, the mass loading coming from the Perched Zone to other geological units and seeps will decline leading to reduced mass loads to the Cape Fear River. Between February 2018 and February 2019 over 45,000 gallons of groundwater from MW-24, NAF-03 and NAF-12 were extracted, and extraction of groundwater from these three wells will continue (Parsons, 2019a). The extracted groundwater has elevated concentrations of Table3+ compounds and this water is disposed of offsite. This groundwater extraction reduces the hydraulic head in the Perched Zone and consequently reduces the PFAS loading from the Perched Zone to the Cape Fear River via aquifers and groundwater seeps. This groundwater extraction also reduces the amount of PFAS mass present in the aquifer. Reduction Plan 17 August 26, 2019 Last, Outfall 002 loading rates in 2019, integrating both dry and wet weather periods, are presently 8% lower than in calendar year 2018. This reduction is potentially a result of various completed actions at the Site, including reduced air emissions. Loading at Outfall 002 is expected to continue a downward trajectory year over year. Reduction Plan 18 August 26, 2019 4 CONSENT ORDER PARAGRAPH 12 PROPOSED ACTIONS This section presents the seven proposed actions to reduce mass loading of PFAS originating from the Site. First an overview of the actions is presented, followed by additional assessment activities that are planned and in-progress that support developing and refining these actions and last a detailed description of each proposed action, along with proposed interim benchmarks are presented. 4.1 Overview of Proposed Actions Beyond actions taken to date (Section 3), the following seven additional proposed actions are estimated to reduce the remaining mass loading of Total Table 3+ PFAS to the Cape Fear River by greater than 50%. These proposed reductions are summarized in Table 2 below and described in the sub-sections below. Table 2: Proposed Paragraph 12 PFAS Loading Reduction Actions Proposed Action Years to Implement Pathway(s) Reduced Estimated Cape Fear River Total Table3+ PFAS Loading Reduction *,** lbs/yr % 1) Capture and Treat Old Outfall 002 Water with a 99% reduction in loading 2 [7] Old Outfall 002 320 to 400 23% to 29% 2) Capture and Treat Seeps with a 95% reduction in loading 5 [5] Seeps 430 to 320 30% to 23% 3) Targeted Sediment Removal from Conveyance Network 1 [4] Outfall 002 20 to 40 Using a 40% reduction at Outfall 002 from actions 3 to 7 (mid-range between lower and best estimates) 1.6% to 2.8% Using a 40% loading reduction at Outfall 002 from actions 3 to 7 (mid- range between lower and best estimates) 4) Develop and Implement a Stormwater Pollution Prevention Plan (SWPPP) 1 [4] Outfall 002 5) Targeted Stormwater Source Control and/or Treatment 4 [4] Outfall 002 6) Terracotta Pipe Decommissioning and Replacement 2 [4] Outfall 002 7) Assessing Potential for Groundwater Intrusion into Conveyance Network 5 [4] Outfall 002 * reductions based on mass loading model estimates from two characterization events. Subsequent characterization events may yield different estimates depending on environmental conditions at the time of sampling due to the dynamic nature of the different transport pathways. ** Total estimated reductions were estimated by summing the may estimates (left hand side number together) and the June estimates (right hand side numbers) together. Both events estimated a 55% reduction for proposed actions. These proposed actions are believed to be feasible within a two to five-year time period based on the present state of knowledge regarding the Site and its subsurface conditions. The first two proposed actions target reducing the highest PFAS concentration pathways Reduction Plan 19 August 26, 2019 (Seeps and Old Outfall) that presently reach the Cape Fear River directly. The other five actions work systematically to reduce Outfall 002 PFAS loadings contributed by the Site. Taken together, these seven actions are estimated to achieve a greater than 50% reduction of Total Table 3+ PFAS mass loading to the Cape Fear River. 4.2 Planned and In-Progress Additional Assessment Activities Based on current data and understandings, technologically and economically feasible actions that could be implemented in two to five years were not identified for the Willis Creek, Georgia Branch Creek and offsite groundwater pathways. Any potential actions for these pathways would be extensively disruptive to local wildlife habitats and costs would be disproportionately high compared to relative benefits. In addition to Old Outfall 002 and the Seeps, onsite groundwater discharge contributes relatively more mass to the Cape Fear River than the remaining other pathways. Geosyntec has recommended that Chemours conduct additional assessment activities regarding the total PFAS loading originating from the facility, including onsite groundwater. Some of these activities will be presented in the Consent Order paragraph 18 On and Offsite Assessment report due September 30, 2019. Based on these activities, Chemours anticipates that it may propose additional actions, including addressing onsite groundwater in the Corrective Action Plan due December 31, 2019 pursuant to Consent Order paragraph 16. These anticipated additional actions would be directed toward reducing total PFAS loading and some of them may potentially be completed within two to five years. Activities recommended and presently being conducted to assess anticipated additional actions include the following: • Completing six additional quarterly assessments of mass loading to the Cape Fear River. Activities in these events will include sampling and flow gauging at the mouths of Seeps A through D, Old Outfall 002, Outfall 002, Willis Creek, Georgia Branch Creek. Also, samples will be collected upstream and downstream of the Site in the Cape Fear River; • Conducting an assessment of Cape Fear River bottom sediment temperatures adjacent to the Site to identify potential zones of increased groundwater upwelling. This will be reported in the On and Offsite Assessment Report due on September 30, 2019; • Conducting further site investigation and characterization activities, including the installation of additional monitoring wells onsite to further delineate PFAS concentrations and geology. Multiple wells have been installed as noted below Reduction Plan 20 August 26, 2019 to further assess hydrogeology and groundwater PFAS concentrations. These wells will be reported in the On and Offsite Assessment Report due on September 30, 2019. o Fifteen additional wells installed adjacent to the Cape Fear River (six pre- existing wells); o Two additional wells installed adjacent to Old Outfall 002 (ten wells were installed adjacent to Old Outfall 002 as part of the PlumeStop™ pilot study (Parsons, 2019); o One well installed adjacent to Willis Creek (four pre-existing wells); and o Three wells installed adjacent to Georgia Branch Creek (no pre-existing wells). • Characterizing further the geology and hydrogeology at 24 locations adjacent to the Cape Fear River using hydraulic profiling and electrical conductivity (HPT/EC) tools. This characterization will be reported in the On and Offsite Assessment Report due on September 30, 2019; • Preparing a numerical model to evaluate groundwater flow conditions in the three water bearing units at Site and evaluate groundwater interactions with the Cape Fear River, to assess the efficacy and support design of potential future actions. This will be prepared to support the Corrective Action Plan due December 31, 2019. • Installing 20 offsite monitoring wells to support further understanding of the horizontal and vertical distribution of PFAS originating from the facility potentially present offsite. These wells will be reported in the On and Offsite Assessment Report due on September 30, 2019; • Conducting continued bimonthly sampling characterization sampling pursuant to Paragraph 11(b) and (c) of the Consent Order; and • Conducting two additional stormwater grab sampling events to assess spatial and temporal trends and loadings from different areas to loads observed at Outfall 002. Reduction Plan 21 August 26, 2019 4.3 Detailed Descriptions of Proposed Actions The following sub-sections list and describe the actions Chemours proposes implementing. The sub-section for each action includes background, the specific proposed action, and proposed benchmarks with associated dates. The first action describes capturing water from Old Outfall 002 and the second action describes capture and treating the seeps. Actions 3 through 7 describe proposed actions to reduce mass loading to the Cape Fear River attributable to Outfall 002. Later in the Reductions Plan Section 5 presents an assessment pursuant to Paragraph 12(d) of the Consent Order if 80% reductions to Outfall 002 loads are technologically and/or economically feasible in a two-year time period after Consent Order Amendment. Action 1: Capture and Treat Old Outfall 002 Water Background: Based on estimates presented in the Mass Loading Model report (Attachment 1) the Old Outfall 002 contributes between 23% to 29% of Total Table 3+ PFAS Loadings to the Cape Fear River. As part of the Consent Order, Chemours is required to implement a remedy that either: (i) captures and treats the dry weather flow of Old Outfall 002 at the location of a proposed dam just upstream of where Old Outfall 002 crosses under Glengerry Road and reduce concentrations of HFPO-DA and PFMOAA in the treated water by 99% or (ii) achieves equivalent or greater reductions. Implementing this 99% reduction remedy will reduce loading of PFAS originating from the facility to the Cape Fear River by an estimated 23 to 29%. Proposed Actions and Benchmarks: Chemours will continue to comply with the existing Consent Order requirements by implementing an ex situ capture and treat remedy for Old Outfall 002. Action 2: Capture and Treat Seeps Background: Water samples collected from Seeps A to D were found to have elevated PFAS concentrations. Based on estimates presented in the Mass Loading Model report the Seeps contribute between 24% to 32% of the Total Table 3+ PFAS loading to the Cape Fear River. Proposed Action: Within five years of Consent Order Amendment, Chemours will implement a capture and treat remedy which will aim to reduce PFAS mass loading from Seeps A, B, C and D by up to 95% provided NCDEQ and other permitting authorities issue required permits. Chemours is presently conducting a detailed evaluation of potential capture approaches, including ex situ capture and treatment of the seeps and in situ groundwater capture and treatment. The capture and treat remedy may also be supported by other measures which would limit mass loading to the seeps. For example, Reduction Plan 22 August 26, 2019 these measures may include hydraulic containment, capping, or in situ sorptive remedies. These supportive approaches will be evaluated as part of Consent Order Paragraph 16 (Corrective Action Plan). Proposed Benchmarks: Chemours proposes proceeding with the following benchmarks and schedule for seep capture provided permitting authorities grant required permits: • Select Seep Capture Approach. December 31, 2019. The capture approach for the seeps will be included as part of the Corrective Action Plan. The selection of the capture approach will be supported by a numerical modeling analysis. • Initial Seep Capture Design. 1 year and 6 months from Consent Order amendment. Initial design will be based on the outcome of numerical model evaluation and continued quarterly seeps and creeks monitoring. • Final Seep Capture Design. 2 years and 6 months from Consent Order amendment. The final design will be based on additional quarterly seeps and creeks monitoring results. • Permit Approval for Seep Capture. 3 years and 6 months from Consent Order Amendment. NCDEQ and other potential permitting authorities have issued required permits. • Remedy Implementation. 5 years from Consent Order Amendment. Seep Capture Remedy Constructed and Operational. Mass Loading reduction of 95% Total Table 3+ PFAS from seeps. Action 3: Targeted Sediment Removal from Conveyance Network Background: PFAS from historical aerial deposition may be present in onsite soils. If impacted soils enter the Site Conveyance Network, they can contribute PFAS to the Cape Fear River via Outfall 002. Investigations of the Site Conveyance Network indicate potential increases in PFAS contributions from sediments present in the Conveyance Network in the open section of the Cooling Water Channel surrounding Monomers IXM and in the Open Channel from where the Waste Water Treatment Facility effluent joins the Channel to the end of the Channel. Presently the loading reductions at Outfall 002 from targeted sediment removal cannot be accurately quantified. Removing sediments from the Cooling Water Channel and the Open Channel to Outfall 002 is expected to support reducing loadings from these Site Conveyance flow components. Reduction Plan 23 August 26, 2019 Proposed Action: Chemours will develop a plan to remove sediment present in the sections of the Site Conveyance Network. Chemours will perform the sediment removal during the yearly turnaroud (when the Site pauses production activities), including passing water through the Site Conveyance Network, to perform yearly preventative maintenance. Proposed Benchmarks: Chemours will remove sediments from the open section of the Cooling Water Channel and the Open Channel to Outfall 002 from the Wastewater Treatment Plant to and including the Outfall 002 sump within 1 year of Consent Order Amendment with reporting due within 1 year and six months of Consent Order Amendment. Action 4: Develop and Implement a Stormwater Pollution Prevention Plan (SWPPP) Background: PFAS from historical aerial deposition may be present onsite soils. If these soils enter the Site Conveyance Network, they can contribute to PFAS at Outfall 002. Stormwater Pollution Prevention Plans provide facility-specific guidance on best management practices to reduce the potential for stormwater-related increases in discharge concentrations. Implementation of the SWPPPs reduce the potential for stormwater contamination from industrial activities and potential sources, such as impacted soils or active construction or soil stockpiling, which will reduce the potential for increased Outfall 002 PFAS concentrations during rainfall events. Presently the expected loading reductions at Outfall 002 from developing and implementing a SWPPP cannot be accurately quantified. This action will help to put in place best practices that are expected to support and help maintain anticipated loading reductions across the entire Site Conveyance Network and at Outfall 002. Proposed Action: Chemours will fund a third party to prepare a SWPPP. Facility personnel will be trained to support implementation and compliance with SWPPP best management practices (BMPs) and inspection procedures. Proposed Benchmarks: A SWPPP will be prepared within 120 days of Consent Order Amendment. Identified facility staff will be trained on how to implement the SWPPP within one year of Consent Order Amendment. Reduction Plan 24 August 26, 2019 Action 5: Implement Targeted Stormwater Source Control and/or Treatment Background: A stormwater grab sampling program was completed in June 2019. This program consisted of collecting water samples from 24 locations across the Site and results from this program indicated areas of elevated PFAS concentrations in stormwater. This suggests that some combination of targeted source control and stormwater collection and treatment could achieve measurable mass loading reductions. At present only one stormwater grab sampling event has been possible due to rainfall patterns since April 2019. A preliminary analysis using the data from this one sampling event suggest that between 16% and 30% of HFPO-DA loading at Outfall 002 can be reduced through targeted stormwater source control and/or treatment approaches. Since only one data set exists at present, additional data and assessment activities are necessary to develop a better understanding of stormwater levels and spatial patterns throughout the Site in order to select and design suitable approaches. Proposed Action: Chemours will fund third party contractors to conduct two additional stormwater grab sampling programs to evaluate stormwater concentrations. Chemours will also fund a third-party contractor to develop a hydrologic stormwater model to assess potential mass loading reductions and to develop a targeted stormwater action plan and best management practices based on the data from the stormwater grab sampling events and the outcome of the modeling analysis. This plan will outline initial actions to be performed. The performance evaluation reporting of the actions will include any potentially recommended supplementary actions. Proposed Benchmarks: Chemours proposes proceeding with the following benchmarks and schedule for Targeted Stormwater Source Control and/or Treatment provided permitting authorities grant required permits: • Complete Stormwater Grab Sample Program: 8 months after Consent Order amendment. • Complete Hydrologic Model Analysis: 1 year after Consent Order Amendment. • Complete Targeted Stormwater Action Plan: 1 year and 6 months after Consent Order Amendment. • Stormwater Actions Plan Actions Implemented: 2 years and 6 months after Consent Order Amendment. • Evaluation of Initial Actions and Supplemental Recommendations: 4 years after Consent Order Amendment. Reduction Plan 25 August 26, 2019 Action 6: Decommission and Replace Remaining Portion of the Terracotta Pipe Background: The remaining portion of the terracotta pipe is a buried pipe at the Site and is presently used to: (i) transmit process water from Kuraray operations to the Wastewater Treatment Plant and (ii) transmit filter wash water from the filtered and demineralized water production facility to the Wastewater Treatment Plant. Prior to June 21, 2017, process wastewaters from the Chemours Monomers IXM Area were transmitted to the Wastewater Treatment Plant via an east-west section of the terracotta pipe. Between June 21, 2017 and November 29, 2017 Chemours diverted process wastewater from the Monomers IXM area away from the Wastewater Treatment Plant and to offsite disposal. On November 29, 2017, Chemours severed the terracotta pipe connection from the Chemours Monomers IXM Area to prevent the potential for process wastewater to be conveyed by the terracotta pipe. In February 2019, Chemours grouted the east-west section of the terracotta pipe (Attachment 4) to limit the potential for groundwater or stormwater to infiltrate this section of the pipe and potentially be transmitted to the Wastewater Treatment Plant and then to Outfall 002 and the Cape Fear River. Recent sampling at locations along the terracotta pipe indicate that PFAS are still present, potentially adhered to remnant sediments or potentially infused onto/into the clay pipe itself (Attachment 3). Kuraray and Chemours are planning to decommission the terracotta pipe and replace it with an above ground pipe. Replacing the terracotta pipe is estimated to reduce HFPO-DA loadings to Outfall 002 between 1% and 2%. Proposed Action: Within 2 years of Consent Order Amendment, Chemours will decommission the terracotta pipe by removing the connection of the terracotta pipe to the Wastewater Treatment Plant. Flows of water to the Wastewater Treatment Plant from the terracotta pipe will be transmitted through newly constructed above ground piping. Proposed Benchmarks: Chemours will decommission the terracotta pipe within two years of the Consent Order Amendment. Action 7: Assess Potential for Groundwater Intrusion into Conveyance Network Background: Water samples collected from the Outfall 002 Open Channel during sampling events conducted in April and June 2019 pursuant to Consent Order Paragraph 11(b) have shown increases in HFPO-DA concentrations along the Open Channel to Outfall 002, near the DuPont Area (Attachment 3; Geosyntec 2019b) with no point sources evident suggesting a diffuse source. The source of these increased HFPO-DA concentrations has not been determined but may be potentially related to: Reduction Plan 26 August 26, 2019 • Sediments in the channel. Sediment samples in the Outfall 002 open channel were too fine and could not be reliably collected during sampling conducted in July 2019. These sediments can be removed as per Action 3 above, and samples of the removed sediment would be sent for analysis of PFAS concentrations; and • Potentially perched zone groundwater containing HFPO-DA enters the Open Channel to Outfall 002 near the DuPont Area where perched zone groundwater levels may potentially be higher than water levels in the Outfall Channel. Groundwater in this area also contains HFPO-DA at concentrations higher than in Outfall 002 (66,000 ng/L at PZ-24; Parsons, 2019c). The Outfall Channel is lined with a grout filled revetment mat and underlain with Geotextile to limit connectivity with the surrounding environment. If groundwater levels are higher than the water levels in the Outfall Channel, then groundwater intrusion is possible in principle but may be limited by the materials from which the channel is constructed. While at present the expected reductions from this action to PFAS loading at Outfall 002 cannot be accurately quantified, this action in combination with Actions 3 described in this document have the potential to reduce facility-based loadings from the Open Channel to Outfall 002. Loadings from the Open Channel to Outfall 002 were estimated to represent between 38% and 69% of the dry weather loading attributable to the facility (i.e. excluding intake contributions) from the April and June 2019 sampling events respectively (Attachment 3). Proposed Actions: During Site turnaround Chemours will (a) survey the elevations of the bottom of the Open Channel and the Outfall 002 sump near the DuPont Area to compare channel bottom elevations to measured nearby groundwater elevations in monitoring wells, and (b) inspect the Open Channel from where the Cooling Water Channel joins the Open Channel to the end of the Open Channel, including the sump, for groundwater entering the Open Channel. If this assessment indicates there is a potential for groundwater to enter into the Site Conveyance Network in this area, Chemours will prepare an action plan to mitigate this contribution to Outfall 002 concentrations. Proposed Benchmarks: Chemours proposes proceeding with the following benchmarks and schedule for assessing the potential for groundwater intrusion into the Open Channel to Outfall 002: • Open Channel sediment removal within 1 year of Consent Order Amendment with reporting due within 1 year and six months of Consent Order Amendment. Reduction Plan 27 August 26, 2019 • Survey elevation of bottom of Open Channel to Outfall 002 and measure water levels in nearby groundwater wells during Site turnaround within 1 year of consent order amendment with reporting due within 1 year and 6 months of consent order amendment. • Inspect Open Channel to Outfall 002 for evidence of any direct connection to groundwater during Site turnaround within 1 year of consent order amendment with reporting due within 1 year and 6 months of consent order amendment. • If necessary, assess potential alternatives for reducing groundwater intrusion: 1 year after Consent Order Amendment. • Conduct actions resulting from alternatives analysis (if necessary): 3 to 5 years after Consent Order Amendment depending on actions recommended and permitting authorities granting any potentially required permits. Reduction Plan 28 August 26, 2019 5 PARAGRAPH 12(D) OUTFALL 002 Of the seven (7) actions Chemours has proposed implementing five (5) proposed actions will reduce Total Table 3+ PFAS loadings to Outfall 002. Similar to Cape Fear River PFAS Loading reductions described earlier, Chemours has reduced HFPO-DA loadings to Outfall 002 by over 99% through completed actions as described in Section 3. With these reductions, Outfall 002 in contributes only between 4% to 7% of Total Table 3+ PFAS mass loading to the Cape Fear River and between 1% and 4% of HFPO-DA loading to the Cape Fear River (Attachment 1). Consequently, any reductions to Outfall 002 under normal operating conditions do little to reduce total mass loadings, especially compared to the proposed reductions for the Old Outfall and the Seeps which together will result in greater than 50% reductions of Total Table 3+ PFAS loading to the Cape Fear River. Regarding further Outfall 002 reductions the Consent Order states: The burden is on Chemours to demonstrate that the concentrations of GenX and perfluoro-1-methoxyacetic acid (PFMOAA) detected in Outfall 002 cannot be reduced by at least 80% from baseline levels, including after measurable storm events, as defined in 40 C.F.R. 122.21(g)(7)(ii), within 2 years. The Outfall 002 Assessment Report (Attachment 3) reported the Outfall 002 load for HFPO-DA and PFMOAA for the calendar year 2018. could further reduce HFPO-DA and PFMOAA concentrations at Outfall 002 and assessed potential reductions from these approaches. These approaches are listed in Table 3 below, including the time length to implement, anticipated Outfall 002 reductions where they can be estimated, and if the approach is technologically and economically feasible. The five proposed actions related to Outfall 002 are estimated to achieve a combined HFPO-DA reduction between 27% to 53% of Outfall 002 yearly HFPO-DA loading; this is estimated to be 0.4% to 2.4% of the HFPO-DA loading to the Cape Fear River. The anticipated loadings for PFMOAA could not be assessed; the available PFMOAA data were too limited to make reduction estimates at present. The estimated HFPO-DA loading reductions would be achieved by reducing the dry weather loads from the Cooling Water Channel and the Open Channel, reducing loads from stormwater through targeted source control and treatment and replacing the terracotta pipe. Including HFPO-DA reductions in 2019 increases the estimated potential combined HFPO-DA loading reduction total to 35% to 61% at Outfall 002, or 0.5% to 2.7% of HFPO-DA loadings to the Cape Fear River. These estimated potential reductions are summarized below in Figure 7, with both lower and “best” estimates shown (Attachment 3). Reduction Plan 29 August 26, 2019 Two control approaches, G and H in Table 3 were at present assessed to be economically infeasible. Approaches G, (Separating Stormwater and Non-Contact Cooling Water Conveyances and Treating Stormwater End of Pipe), requires extensive construction of piping network. Both approaches G and H (treating stormwater and non-contact cooling water end of pipe) would require enormous treatment media usage and treatment system infrastructure. The extremely high anticipated costs would be disproportionately large compared to estimated benefits to Cape Fear River loading reductions, particularly as Outfall 002 at present is only a relatively small contributor to River loadings. Table 3: Potential Outfall 002 Control Approaches Potential Outfall 002 Control Approaches Years to Implement HFPO-DA Reduction to Outfall 002 HFPO-DA Reduction to Cape Fear River Technologically and Economically Feasible A: Targeted Sediment Removal – Proposed Action 3 1 NQ Note 1 NQ Note 1  B: Develop and Implement a SWPPP – Proposed Action 4 1 NQ Note 1 NQ Note 1  C: Targeted Stormwater Source Control and/or Treatment – Proposed Action 5 4 16 to 30% 1%  E: Reducing Potential Groundwater Intrusion – Proposed Action 7 3 to 5 6 to 13% 0.5%  D: Decommissioning and Replacing the Remaining Portion of the Terracotta Pipe – Proposed Action 6 2 1 to 2% 0.1%  F: Additional Investigation to Assess and Control Dry Weather Cooling Water Channel Sources – Note 1 2 to 4 Note 1 4 to 8% 0.2 to 0.4%  Note 1 G: Separating Stormwater and Non-Contact Cooling Water Conveyances and Treating Stormwater End of Pipe 5 40% 2%  H: Treating Stormwater and Non-Contact Cooling Water End of Pipe 3 80% 3%  NQ – not quantifiable 1 – Targeted sediment treatment, SWPPP actions and targeted stormwater source control and treatment may accomplish Cooling Water Channel loading reductions making no additional benefit to further investigations. The range of 2 to 4 years for these additional investigations recognizes that the targeted sediment removal and targeted stormwater approaches would be attempted first in this sequence. Reduction Plan 30 August 26, 2019 Table 4: Estimated Outfall 002 HFPO-DA Reductions by Conveyance Network Flow Component Conveyance Network Flow Component Actions Estimated to Contribute to Loading Reductions Estimated Range of HFPO-DA Reductions at Outfall 002 2018 to 2019 Reductions - Air abatement, - Site practices 8% Stormwater (Targeted Areas) - Action 5 – Targeted Stormwater 16 to 30% Open Channel to Outfall 002 - Action 3 – Sediment Removal - Action 4 – SWPPP - Action 7 – Assess Groundwater Intrusion 6 to 13% Wastewater Treatment Plant / Terracotta Pipe - Action 6: Terracotta Pipe 1 to 2% Cooling Water Channel* (i.e. CWC) - Action 3 – Sediment Removal - Action 4 – SWPPP - Action 5 – Targeted Stormwater - If needed, further assessment - As Needed Investigation and Control of Dry Weather Loading Sources 4 to 8% Total 35% to 61% * The anticipated reduction percentages presented for the Cooling Water Channel assume that sediment removal, stormwater actions and SWPPP together will accomplish the estimated reductions shown here and if not then the Cooling Water Channel investigation and control of dry weather loading sources, which is a potential action under consideration not a proposed action at this time, would be implemented later as necessary. Reduction Plan 31 August 26, 2019 Figure 7: Lower and Best Estimates of HFPO-DA Load Reductions in Outfall 002 Compared to 2018 Loads. The anticipated reduction percentages presented for the Cooling Water Channel assume that sediment removal, stormwater actions and SWPPP together will accomplish the estimated reductions shown here and if not then the Cooling Water Channel investigation and control of dry weather loading sources, which is a potential action under consideration not a proposed action at this time, would be implemented later as necessary. CWC – Cooling Water Channel WWTP – Wastewater Treatment Plant 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Lower Estimate of Reductions from Proposed Control Measures Best Estimate of Reductions from Proposed Control MeasuresReductions as Percent of Total LoadReductions Yielded in 2019 CWC Contributions WWTP/Terracotta Pipe Open Channel Contributions Stormwater (Targeted Areas) Reduction Plan 32 August 26, 2019 6 SUMMARY To date Chemours has reduced the loading of HFPO-DA in the Cape Fear River by over 95%. Chemours is committed to further reducing PFAS loadings, including HFPO-DA, to the Cape Fear River. Pursuant to Consent Order Paragraph 12 Geosyntec has developed the proposed recommended actions detailed in this plan and Chemours anticipates that following NCDEQ and CFRW review, the parties will come to an agreement to amend the Consent Order to incorporate the proposed recommended actions. This reduction plan proposes seven actions that would reduce the Total Table 3+ PFAS loadings in the Cape Fear River by greater than 50% from observed May and June 2019 levels. These actions will be implemented over a two to five-year period upon Consent Order Amendment. The selection of these actions was supported by numerous field investigations, development of a PFAS Mass Loading Model and an assessment of HFPO-DA and PFMOAA at Outfall 002. The PFAS Mass Loading Model identified three PFAS transport pathways (the Old Outfall 002 onsite groundwater and Seeps) as primary contributors to Cape Fear River Table 3+ PFAS mass loading. Consequently, two of the actions focus on reducing mass loading from these pathways. The Outfall 002 assessment identified areas of HFPO-DA and PFMOAA loading in the Site Conveyance network that guided the selection of five actions to reduce HFPO-DA and PFMOAA loading at Outfall 002. Chemours is also advancing additional characterization efforts at the Site to support the selection and placement of these and other actions to further reduce PFAS loading originating from the facility to the Cape Fear River. These potential additional actions will be evaluated in the Corrective Action Plan due December 31, 2019. Reduction Plan 33 August 26, 2019 7 REFERENCES Geosyntec 2018: Assessment of the Chemical and Spatial Distribution of PFAS in the Cape Fear River, September 17, 2018 Geosyntec 2019a: Site Associated PFAS Fate and Transport Study, Chemours Fayetteville Works. June 2019. Geosyntec 2019b: Characterization of PFAS in Process and Non-Process Wastewater and Stormwater Quarterly Report #1. Chemours Fayetteville Works July 31, 2019. Parsons, 2018. Additional Site Investigation Report, Chemours Fayetteville Works Site. RCRA Permit No. NCD047368642-R1. January 31, 2018. Parsons, 2019a: Results of Temporary Perched Zone Groundwater Pumping, Chemours Fayetteville Works Site. RCRA Permit No. NCD047368642-R2-M3. June 2019. Parsons, 2019b: Old Outfall 002 Remedial Options Plan, Chemours Fayetteville Works Site. RCRA Permit No. NCD047368642-R2-M3. May 2019. Parsons, 2019c: Southeast Perched Zone Investigation Report. Chemours Fayetteville Works. RCRA Permit No. NCD047368642-R2-M3. March 2019 ATTACHMENT 1: Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes CAPE FEAR RIVER PFAS MASS LOADING MODEL ASSESSMENT AND PARAGRAPH 11.1 CHARACTERIZATION OF PFAS AT INTAKES Chemours Fayetteville Works, NC Prepared for The Chemours Company FC, LLC Fayetteville Works 22828 NC Highway 87 W Fayetteville, NC 28306 Prepared by Geosyntec Consultants of NC, P.C. 2501 Blue Ridge Road, Suite 430 Raleigh, NC 27607 Geosyntec Project Number TR0795 August 2019 PFAS Mass Loading Model Assessment i August 26, 2019 TABLE OF CONTENTS EXECUTIVE SUMMARY ......................................................................................................... VII 1. INTRODUCTION ....................................................................................................................1 1.1 Objectives .................................................................................................................................1 1.2 Document Organization ...........................................................................................................2 2. SITE BACKGROUND .............................................................................................................3 3. SITE SETTING ........................................................................................................................4 3.2 Cape Fear River and Downstream Public Water Utility Intakes ..............................................7 3.3 Potential PFAS Transport Pathways to Cape Fear River .........................................................7 4. PFAS MASS LOADING MODEL DESIGN ...........................................................................9 4.1 Upstream Cape Fear River (Transport Pathway 1) ................................................................11 4.2 Tributaries – Willis Creek, Georgia Branch Creek, and Old Outfall 002 (Transport Pathways 2, 7 and 9) ......................................................................................................................................12 4.3 Aerial Deposition to the Cape Fear River (Transport Pathway 3) .........................................12 4.4 Onsite Groundwater (Transport Pathways 5 and 6) ...............................................................12 4.4.1 Indirect Pathway – Groundwater Seeps to River (Transport Pathway 6) .........13 4.4.2 Direct Pathway – Groundwater Discharge to River (Transport Pathway 5) .....13 4.5 Outfall 002 and Facility Stormwater Runoff (Transport Pathway 4) .....................................13 4.6 Offsite Groundwater (Transport Pathway 8) ..........................................................................14 5. MODEL CALIBRATION AND SENSITIVITY ANALYSIS ..............................................15 5.1 Model Calibration ...................................................................................................................15 5.2 Model Results .........................................................................................................................17 5.3 Sensitivity Analysis ................................................................................................................19 6. LIMITATIONS AND ASSUMPTIONS ................................................................................21 7. SUPPLEMENTAL ACTIVITIES ..........................................................................................22 8. CONSENT ORDER PARAGRAPH 11.1 ANALYSIS .........................................................23 8.1 Assessment Methodology .......................................................................................................24 8.1.1 PFAS Compound Source Origination Assessment ...........................................24 9. SUMMARY ...........................................................................................................................26 10. REFERENCES .......................................................................................................................28 PFAS Mass Loading Model Assessment ii August 26, 2019 LIST OF TABLES Table 1: PFAS Mass Loading Model Potential Pathways Table 2: Analytical Methods and Analyte List Table 3: Summary of Analytical Results – Total PFAS and Total Table 3+ Table 4: Summary of Flow Rate Input Values Table 5: Model Estimated Total Table 3+ Mass Loading Calibration Table 6: Model Estimated Total Table 3+ Mass Loading Contributions Per Pathway Table 7-A: Observed Concentrations and Mass Loading at Bladen Bluffs - May 2019 and June 2019 Table 7-B: Observed Concentrations and Mass Loading at Kings Bluff - May 2019 and June 2019 Table 8-A: Estimated Pathway Contribution to Observed Concentration at Bladen Bluffs - May 2019 Table 8-B: Estimated Pathway Contribution to Observed Concentration at Bladen Bluffs - June 2019 Table 8-C: Estimated Pathway Contribution to Observed Concentration at Kings Bluff - May 2019 Table 8-D: Estimated Pathway Contribution to Observed Concentration at Kings Bluff - June 2019 Table 9-A: Estimated Mass Loading with 1st Quartile Input Values – May 2019 Table 9-B: Estimated Mass Loading with 1st Quartile Input Values – June 2019 Table 10-A: Estimated Contribution Percentage of Pathway to Total Mass Loading – May 2019 Table 10-B: Estimated Contribution Percentage of Pathway to Total Mass Loading – June 2019 Table 11: Estimated Mass Loading Source Origination Percentages Per Compound Per Pathway PFAS Mass Loading Model Assessment iii August 26, 2019 LIST OF FIGURES Figure 1: Site Location Map Figure 2: Potential PFAS Pathways to the Cape Fear River from Site Figure 3: Cape Fear River Watershed and Downstream Public Utility Intakes Figure 4: Comparison of Observed and Best-fit Modeled Total Table 3+ Mass Loading at Bladen Bluffs Figure 5: Estimated Pathway Contributions to Observed Total Table 3+ Concentrations Adjacent to Bladen Bluffs Intake Figure 6: Modeled and Empirical HFPO-DA Time Series at Kings Bluff Figure 7: Estimated Source of Observed Total PFAS Concentration at Bladen Bluffs and Kings Bluff PFAS Mass Loading Model Assessment iv August 26, 2019 LIST OF APPENDICES Appendix A: Supplemental Analytical Data Appendix B: Supplemental Flow Gauging Data Appendix C: Supporting Calculations – Direct Aerial Deposition on Cape Fear River Appendix D: Supporting Calculations – On Site Groundwater Flow Estimate Appendix E: Supporting Calculations – Off Site Groundwater Flow Estimate Appendix F: Summary of Sensitivity Analysis Results PFAS Mass Loading Model Assessment v August 26, 2019 ACRONYMS AND ABBREVIATIONS % Percent bgs Below Ground Surface CFPUA Cape Fear Public Utility Authority CO Consent Order CSM Conceptual Site Model DuPont E.I. du Pont de Nemours and Company EPA Environmental Protection Agency (United States) ft Feet HPT/EC Hydraulic Profiling Tool and Electrical Conductivity HFPO-DA Hexafluoropropylene oxide dimer acid LTW Long-Term Wells MSL Mean Sea Level m/s Meters per Second NCDEQ North Carolina Department of Environmental Quality NRMSE Normalized Root Mean Square Error NVHOS Perfluoroethoxysulfonic acid PFAS Per- and polyfluoroalkyl substances PMPA Perfluoro-2-methoxypropanoic acid PVF Polyvinyl Fluoride SOP Standard Operating Protocol USGS United States Geological Survey WWTP Wastewater Treatment Plant PFAS Mass Loading Model Assessment vii August 26, 2019 EXECUTIVE SUMMARY Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this report for The Chemours Company FC, LLC (Chemours) to describe the mass loading model developed to inform a plan to reduce per- and polyfluoroalkyl substances (PFAS) to the Cape Fear River from the Chemours Fayetteville Works Site (the Site) pursuant to Paragraph 12 of the executed Consent Order (CO) dated 25 February 2019 among the North Carolina Department of Environmental Quality (NCDEQ), Cape Fear River Watch, and Chemours. The model presented in this report is required by Consent Order Paragraph 12 and is one of four documents supporting the Cape Fear River PFAS Reduction Plan (“the Reduction Plan”). The objective of the model is to identify the PFAS loading from transport pathways originating from the Site to the Cape Fear River. This objective is accomplished by estimating total PFAS mass loading originating from the Site to the Cape Fear River, including estimates of loading from nine transport pathways, and comparing these estimates to empirically measured PFAS loading in the Cape Fear River. The results of the modeling analysis have been used to support the selection of PFAS mass loading reduction actions being proposed in the Reduction Plan. PFAS mass loading is defined, in this model, as the combined mass per unit time (e.g. nanograms per second) from potential sources. The model estimates PFAS contributions from nine pathways (i.e. compartments) such as various creeks and groundwater to estimate Cape Fear River mass loading using measured Cape Fear River flow volumes. These estimated mass loading are then compared to measured in-river mass loading as an assessment of model calibration. The mass loading model constructed, calibrated, and applied is a quantitative estimate of the current understanding of the conceptual site model and transport pathways. It is based on availability of data points, and thus in a complex and dynamic environment, there are uncertainties. The model was constructed based on discrete field observations, which were then interpolated to approximate conditions across the model domain and assumed to be representative in between the measured points. This model is useful to identify trends in mass loading to the Cape Fear River for a range of conditions and support identification of potential target pathways for actions to achieve objectives for mass loading and corresponding concentration reductions of Site associated PFAS in the Cape Fear River. A total of 21 iterative calibration scenarios were performed to optimize the model-estimated total Table 3+ mass loading in the Cape Fear River to approximately match empirical mass loading at the Bladen Bluffs raw water intake based on the May and June 2019 field programs. For each calibration iteration, the estimated total Table 3+ mass loading to the river was compared to empirical loading at Bladen Bluffs, for the same sampling time period and five input parameter scenarios (1st quartile, median, 3rd quartile, average and geometric mean values for concentration and flow) to assess how the variability in the possible set of input parameters chosen would affect PFAS Mass Loading Model Assessment viii August 26, 2019 results. Calibrated model-fit was tested through computation of a normalized root mean square error (NRMSE) between modeled and empirical mass loading. Calibration results indicate that a lower bound NRMSE of 0.16 was achieved assuming the 1st quartile model input parameter values for nine calibration steps. To identify a best-fit model amongst these nine calibrations steps, the lowest sum of NRMSE between modeled and empirical mass loading for all five input parameter scenarios was evaluated. Calibration results indicate that a best-fit model was achieved for calibration step 8 assuming the 1st quartile model input parameter values. The best-fit model identified in calibration assumes the following 1st quartile model input parameter values: (a) onsite discharge area of 58%; (b) upper Black Creek Aquifer hydraulic conductivity of 1x10-6 meters per second (m/s); (c) lower Black Creek Aquifer hydraulic conductivity of 1.5x10-4 m/s; and (d) offsite Surficial Aquifer hydraulic conductivity of 2.5x10-4 m/s. From the nine transport pathways evaluated the mass loading model estimates that the Old Outfall 002 and Seeps (Transport Pathways 7 and 6 respectively) are the largest contributors of Table 3+ PFAS mass to the Cape Fear River based on inputs from the two mass loading characterization events (May and June 2019). These two pathways combined contribute approximately 53% to 55% of the loading of Table 3+ PFAS to the Cape Fear River. Onsite groundwater (Transport Pathway 5) is the next largest contributing mass loading pathway to the Cape Fear River with 17% and 22%. Additional assessments and characterization of onsite groundwater are currently being undertaken, including preparing a numerical groundwater model to evaluate groundwater interactions with the Cape Fear River and to evaluate the efficacy and support design of potential future actions. Additionally, six more quarterly field events evaluating mass loading to the river will be completed to assess and refine these mass loading findings over time and in different weather and seasonal conditions. Pathway Total Table 3+ Estimated Loading Percentage per Pathway per Event May 2019 Event June 2019 Event [1] Upstream River Water and Groundwater 4% 15% [2] Willis Creek 10% 4% [3] Aerial Deposition on Water Features < 2% < 2% [4] Outfall 002 4% 7% [5] Onsite Groundwater 22% 17% [6] Seeps 32% 24% [7] Old Outfall 002 23% 29% [8] Offsite Adjacent and Downstream Groundwater < 2% < 2% [9] Georgia Branch Creek 4% 3% PFAS Mass Loading Model Assessment ix August 26, 2019 Using a combination of mass loading model assessment results and observed PFAS concentrations at downriver raw water intakes, an assessment was performed pursuant to Paragraph 11.1 of the Consent Order, to estimate the percentage of PFAS loading at downriver raw water intakes as originating from the Site, other sources, or at present unknown sources (which could be either the Site or the other sources). On a total PFAS basis this analysis indicated that at Bladen Bluffs and Kings Bluff raw water intakes for the May and June 2019 sampling events, between 68% to 84% of PFAS may have originated from the Site. Meanwhile, between 13% to 29% of PFAS may have originated from other, non-Chemours sources and 2% to 3% may have originated from unknown sources which may potentially be non-Chemours or Chemours sources; the unknown sources will assessed in upcoming planned characterization activities. Actions proposed in the Reduction Plan and the upcoming Corrective Action Plan due on December 31, 2019 will reduce the total PFAS loading to the Cape Fear River and significantly reduce the loading originating from the Site. The mass loading model developed provides a basis for continued evaluation of the PFAS mass load contributions to the Cape Fear River. Additional sampling events are planned, and this data will be used in the model to confirm the parameters used to date. In the first two sampling events, the largest contributing pathways are the seeps (A to D) and Old Outfall 002. The mass loading model will serve to inform proposed PFAS loading reductions and as remedial measures are put in place to then support quantification of PFAS loading reductions. PFAS Mass Loading Model Assessment 1 August 26, 2019 1. INTRODUCTION Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this report which describes the mass loading model assessment completed for The Chemours Company FC, LLC (Chemours) for the Fayetteville Works (Site) in Bladen County, North Carolina. This report describes a mass loading model that was developed to inform a plan to reduce per- and polyfluoroalkyl substances (PFAS) to the Cape Fear River from the Site pursuant to Paragraph 12 of the executed Consent Order (CO) dated 25 February 2019 among the North Carolina Department of Environmental Quality (NCDEQ), Cape Fear River Watch, and Chemours. This report also presents a characterization of PFAS at downstream raw water intakes based on the mass loading model assessment pursuant to Paragraph 11.1 of the CO. CO Paragraph 12 relates to the “Accelerated Reduction of PFAS Contamination in the Cape Fear River and Downstream Water Intakes” and requires the development of a model that accounts for sources of PFAS from the Facility contributing loading of PFAS into the Cape Fear River, Willis Creek, Georgia Branch, and Old Outfall 002. Geosyntec has been approved by NCDEQ and contracted by Chemours to perform the modeling effort for CO Paragraph 12(b). This model is presented here in this report. 1.1 Objectives The objective of this report is to describe the modeling analyses (the PFAS mass loading model) undertaken to estimate PFAS mass loading originating from the facility to the Cape Fear River directly and through Willis Creek, Georgia Branch Creek, Old Outfall 002, four groundwater seeps on the bluff near the manufacturing area to the Cape Fear River, and discharging groundwater that reach the Cape Fear River from the Site. The objective of the model is to evaluate total PFAS mass loading originating from the facility to the Cape Fear River and estimate the percentage of mass loading coming from each transport pathway in empirically measured PFAS mass in the river. The results of the modeling analysis will be used to support the selection of PFAS mass loading reductions actions by helping identify which transport pathways contribute the most to total PFAS loading from the facility in the Cape Fear River. PFAS mass loading is defined, in this model, as the combined mass per unit time (e.g. nanograms per second) from potential sources. The model estimates PFAS contributions from multiple pathways (i.e. compartments) such as various creeks and groundwater to estimate Cape Fear River concentrations using measured Cape Fear River flow volumes. These estimated concentrations are then compared to measured in-river concentrations as an assessment of model calibration. Results from the calibrated model are then used in combination with known background and upstream PFAS Mass Loading Model Assessment 2 August 26, 2019 PFAS concentrations to characterize PFAS mass loading contributions from the Site to downstream raw water intakes, as required in Paragraph 11.1 in the CO, and assess potential reductions in PFAS mass loading to the Cape Fear River. 1.2 Document Organization The remainder of this document contains the following sections: • Section 2 – Site Background – this section describes Site background and use; • Section 3 – Site Setting – this section describes the Site setting, including the current understanding of the conceptual site model and potential transport pathways for PFAS originating from the facility; • Section 4 – PFAS Mass Loading Model Design – this section describes how the PFAS mass loading model was constructed and developed; • Section 5 – Model Calibration and Sensitivity Analysis – this section describes how the model was calibrated, including calibration datasets; and procedures for addressing uncertainties associated with the model; • Section 6 – Limitations and Assumptions – this section presents a discussion of some limitations and assumptions of the mass loading model assessment; • Section 7 – Supplemental Activities – this section summarizes additional and ongoing field activities; • Section 8 – Paragraph 11.1 Characterization of PFAS Mass Loading in Downstream Raw Water Intakes – this section describes PFAS mass loading contributions from the Site to downstream raw water intakes; • Section 9 – Summary – this section describes a summary of the mass loading model assessment results as it pertains to the PFAS Reduction Plan; and • Section 10 – References – this section lists work plan reference documentation. PFAS Mass Loading Model Assessment 3 August 26, 2019 2. SITE BACKGROUND The Site is located within a 2,177-acre property at 22828 NC Highway 87, approximately 20 miles southeast of the city of Fayetteville along the Bladen-Cumberland county line in North Carolina. Figure 1 presents an overview of the Site. The Site is bounded by NC Highway 87 to the west, Cape Fear River to the east, and on the north and south by undeveloped areas and farmland. Willis Creek and Georgia Branch Creek, tributaries to the Cape Fear River, are located toward the northern and southern property boundaries, respectively, with Georgia Branch Creek being offsite for its entire course. The Site property was originally purchased by E.I. du Pont de Nemours and Company (DuPont) in 1970 for production of nylon strapping and elastomeric tape. DuPont sold its Butacite® and SentryGlas® manufacturing units to Kuraray America Inc. (Kuraray) in June 2014 and subsequently separated its specialty chemicals business to Chemours in July 2015. Presently, the Site consists of five manufacturing areas (Figure 1): Chemours Monomers IXM (Area 1); Chemours Polymer Processing Aid (PPA; Area 2); Kuraray Butacite® (Area 3); Kuraray SentryGlas® (Area 4); and DuPont Company polyvinyl fluoride (PVF) resin manufacturing unit (Area 5). In addition to the manufacturing operations, Chemours operates two natural gas-fired boilers and a wastewater treatment plant (WWTP) for the treatment of sanitary wastewaters as well as process wastewaters from Kuraray and DuPont. PFAS Mass Loading Model Assessment 4 August 26, 2019 3. SITE SETTING A description of the Site setting, including the physical setting of the Site, Site geology and hydrogeology and site associated PFAS were provided in the Cape Fear River PFAS Mass Loading Model Scope of Work document (Geosyntec, 2019a). The recent investigation summarized in the Seeps and Creeks Investigation Report (Geosyntec 2019b) also provided additional details on the site geology and hydrogeology. A brief summary of the Conceptual Site Model (CSM), as it relates to PFAS loading to the Cape Fear River, and potential transport pathways of PFAS from the Site to the Cape Fear River are summarized here. The land surface is relatively flat in the manufacturing areas of the Site and slopes down a bluff with about a 100-foot change in elevation towards the Cape Fear River on the east side of the Site. To the north of the Site, the property slopes towards Willis Creek, which is a tributary that discharges to the Cape Fear River. To the south of the manufacturing area is the Old Outfall Channel, which also discharges to the Cape Fear River. Further south, off the Site, is Georgia Branch Creek which is a tributary to the Cape Fear River. Site Geology As described by Parsons (2018), Bladen County is within the Coastal Plain Physiographic Province, which consists of a seaward thickening wedge of sedimentary deposits ranging in age from Cretaceous to Recent. Paleozoic metamorphic and igneous rocks underlie these deposits. The Site is underlain by the Black Creek Formation, which is characterized by lignitic clay with thin beds and laminae of fine-grained micaceous sand as well as thick lenses of cross-bedded sand. The upper portion of the formation may also contain glauconitic, fossiliferous clayey sand lenses. The Black Creek Formation and surficial deposits are the principal potable water aquifers in the region. Based on the lithology logged during previous onsite investigations, the Site is underlain by a fine- to medium-grained sand unit with thin discontinuous interbedded silt/clay lenses. The sand extends to a depth of approximately 65 feet below ground surface (ft bgs) (elevation of +80 feet MSL). The saturated portion of this unit has been identified as the Surficial Aquifer. Beneath this unit is a 7- to 15-foot-thick, laterally-continuous dense clay that has been identified as the Black Creek Confining Unit. The elevation of this unit (approximately +65 to +77 ft MSL) indicates that it, too, should outcrop along the bluff face adjacent to the Cape Fear River, and potentially along the embankment near Willis Creek. Beneath this confining unit is the Black Creek Aquifer, which is approximately 8 to 20 ft thick and is encountered at depth between 80 and 100 ft bgs (elevation of approximately +45 to +65 ft MSL) at the top of the bluff. Beneath this aquifer is a massive dense clay (with minor PFAS Mass Loading Model Assessment 5 August 26, 2019 sand stringers) that has been identified as the Upper Cape Fear Confining Unit. This unit was not fully penetrated at the Site; however, it extended to at least 200 ft bgs (elevation of -55 ft MSL). Beneath the manufacturing area, the uppermost sand unit is locally bisected by an aerially extensive stiff clay lens. This clay lens is limited in lateral extent to the east, north and south by local topography and pinches out (terminates) to the west of the manufacturing area. The depth to the top of the clay lens is approximately 15 to 18 ft bgs. The clay lens becomes thinner moving west across the manufacturing area and ranges from approximately one foot to approximately 19 ft thick. Site Hydrogeology The hydrogeology of the Site includes a perched water zone and two aquifers; the Perched Zone, the Surficial Aquifer and the Black Creek Aquifer. The Perched Zone is aerially limited and generally is located above the top of a discontinuous clay layer present in the manufacturing area. Based on recent investigations and on-going evaluations, the Perched Zone may have been influenced by seepage of surface water through the previously unlined sedimentation basins and infiltration of non-contact cooling water from previously unlined drainage ditches. In 2018, the sedimentation basins and cooling water channel were lined. Perched zone water flows radially from a potentiometric high near the sedimentation basins. Where perched water is present, it is encountered from between 6 to 20 feet bgs. The lateral extent of the Perched Zone is controlled by topography and the lateral extent of the clay lens. The Seeps and Creeks Investigation Report (Geosyntec 2019b) indicate seepage faces along the bluff appear to be consistent with Perched Zone water. The Surficial Aquifer is a shallow unconfined aquifer encountered at approximately 50 ft bgs. Groundwater elevations range from approximately 100 to 107 ft above MSL in the western areas of the Site to approximately 93 ft above MSL in the eastern areas of the Site, indicating that groundwater flow is generally toward the Cape Fear River. The Cape Fear River stage is typically near +30 ft MSL, which is lower than the base elevation of the Surficial Aquifer, indicating that the Cape Fear River is a discharge boundary through seeps and creeks, for the Surficial Aquifer. Based on groundwater elevations near Willis Creek, portions of the creek are “gaining” (groundwater discharges to the creek) and portions are “losing” (surface water infiltrates to the underlying groundwater). Georgia Branch Creek also appears to be a gaining stream near where State Road 1303 crosses Highway 87. The Surficial and Black Creek Aquifers are mostly separated by the Black Creek confining unit, a clay layer. This clay layer is not fully confining as geological and geochemical data indicate water and PFAS transfer has occurred from the Surficial Aquifer to the Black Creek Aquifer. The Black PFAS Mass Loading Model Assessment 6 August 26, 2019 Creek Aquifer is the uppermost identified regional hydrogeologic unit. Flow in the Black Creek Aquifer is toward the Cape Fear River. The Cape Fear River stage is also lower than the base of the Black Creek Aquifer, indicating that the Cape Fear River is also a discharge boundary for the Black Creek Aquifer. Below the Black Creek Aquifer is the Upper Cape Fear Confining Unit. This clay is over 30-feet (ft) thick and is an aquitard to potential further downward flow based on limited onsite geological borings and United States Geological Survey (USGS) groundwater wells at the Site that demonstrate minimal hydraulic connection between the Black Creek Aquifer and the Upper Cape Fear Aquifer. The Black Creek Aquifer typically comprises of fine to medium grained, well sorted sands and appears to be in direct connection to the Cape Fear River along the river bank. However, the upper 20-25 feet of the Black Creek Aquifer near the Cape Fear River is overlain by fine grained materials including silt to sandy and silty clay as noted in the Long-Term Well (LTW) logs. This upper portion of the aquifer is likely to have lower groundwater upwelling to the Cape Fear River in comparison to fine to medium grained, well sorted sands in the lower part of the aquifer. Historic borings and recent field investigations have shown that the Upper Cape Fear Confining Unit, a regionally extensive lithologic unit comprising of hard, fat clay, underlies the Black Creek Aquifer, at elevations similar to the Cape Fear River bottom. This unit was not fully penetrated at the Site; however, it extended to at least 200 feet bgs (elevation of -55 feet MSL). This clay is over 34-feet (ft) thick and is an aquitard to potential further downward flow based on limited onsite geological borings and USGS groundwater wells at the Site that demonstrate minimal hydraulic connection between the Black Creek Aquifer and the Upper Cape Fear Aquifer. Recent field investigations have identified that groundwater seeps to surface where the three primary aquifer units onsite intersect the side of the bluff slope below the facility (Geosyntec, 2019b). The groundwater seeps out and flows towards the Cape Fear River in a series of naturally occurring erosional channels. These channels have been observed to contain a steady flow of water where they intersect groundwater. These channels and the water that flows in them are herein referred to as Seeps. The four seeps observed on the eastern bluff adjacent to the Cape Fear River from north to south are named Seep A, Seep B, Seep C and Seep D (Figure 2). In addition to the onsite seeps, there are three perennial surface water features that are tributaries to the Cape Fear River at or adjacent to the Site. To the north of the Site is Willis Creek, in proximity to the water intake for the Site. To the south of the Site is Georgia Branch Creek which discharges to the Cape Fear River approximately 7,500 feet south of the W.O. Huske Dam. Old Outfall 002 is fed by discharging groundwater and Old Outfall 002 discharges into the Cape Fear River approximately 1,350 feet south of W.O. Huske Dam. PFAS Mass Loading Model Assessment 7 August 26, 2019 3.2 Cape Fear River and Downstream Public Water Utility Intakes The Cape Fear River and its entire watershed are located in the state of North Carolina (Figure 3). The Cape Fear River drains 9,164 square miles and empties into the Atlantic Ocean near the City of Wilmington, North Carolina. The Site is situated on the western bank of the Cape Fear River and draws water from the Cape Fear River and returns over 95% of this water via Outfall 002 after being used primarily as non-contact cooling water. Two lock and dam systems with USGS stream gauges are located downstream of the Site: (1) W.O. Huske Lock and Dam, located 0.5 river miles from the Site (USGS 02105500); and (2) Cape Fear Lock and Dam #1, located 55 river miles downstream (USGS 02105769). The Cape Fear River is also a water source for downstream communities of the Site. Raw water intakes are located at Bladen Bluffs and Kings Bluff Intake Canal, located approximately 5 miles and 55 miles downstream from the Site. These intakes serve as Cape Fear River water intakes for the Lower Cape Fear Water and Sewer Authority which in turn provides water to Cape Fear Public Utility Authority (CFPUA) and other water providers. Drinking water sourced from the Cape Fear River does contain certain chemicals from several sources including 1,4-dioxane, trihalomethanes associated with bromide content in raw river water, pharmaceuticals, personal care products, endocrine disrupting chemicals, and PFAS. A brief description of these chemicals and their presence in the Cape Fear River was reported previously (Geosyntec, 2018b). 3.3 Potential PFAS Transport Pathways to Cape Fear River Potential pathways for PFAS originating from the Site that may reach the Cape Fear River were identified by reviewing available Site data at the time of this assessment. Nine potential pathways (Table 1) were identified as potentially contributing to observed in-river PFAS concentrations. These pathways represent compartments to model as part of the PFAS loading model. The potential pathways are listed below, and shown on the conceptual diagram provided in Figure 2: Transport Pathway 1: Upstream Cape Fear River and Groundwater – This pathway is comprised of contributions from non-Chemours related PFAS sources on the Cape Fear River and tributaries upstream of the Site, and upstream offsite groundwater with Table 3+ compounds present from aerial deposition; Transport Pathway 2: Willis Creek – Groundwater and stormwater discharge and aerial deposition to Willis Creek and then to the Cape Fear River; Transport Pathway 3: Direct aerial deposition of PFAS on the Cape Fear River; PFAS Mass Loading Model Assessment 8 August 26, 2019 Transport Pathway 4: Outfall 002 – Comprised of (i) water drawn from the Cape Fear River and used as non-contact cooling water, (ii) treated non- Chemours process water and (iii) Site stormwater, which are then discharged through Outfall 002; Transport Pathway 5: Onsite Groundwater – Direct upwelling of site groundwater to the Cape Fear River from the Black Creek Aquifer; Transport Pathway 6: Seeps – Groundwater Seeps (currently identified seeps are A, B, C and D) above the Cape Fear River water level on the bluff face from the facility that discharge into the Cape Fear River; Transport Pathway 7: Old Outfall 002 – Groundwater discharge to Old Outfall 002 and stormwater runoff that flows into the Cape Fear River; Transport Pathway 8: Adjacent and Downstream Groundwater – Offsite groundwater adjacent and downstream of the Site upwelling to the Cape Fear River; and, Transport Pathway 9: Georgia Branch Creek – Groundwater, stormwater discharge and aerial deposition to Georgia Branch Creek and then to the Cape Fear River. PFAS Mass Loading Model Assessment 9 August 26, 2019 4. PFAS MASS LOADING MODEL DESIGN The objective of the model is to estimate total PFAS mass loading originating from the facility to the Cape Fear River and estimate the percentage of mass loading coming from each transport pathway in empirically measured PFAS mass loads in the river. The model is comprised of multiple compartments that describe bulk PFAS mass transfer to the Cape Fear River. Each compartment represents a pathway that has been parameterized primarily using measured data. This approach is designed to identify broad trends in mass loading to the Cape Fear River for a range of conditions and to support identification of potential target pathways for actions to achieve objectives for mass load and corresponding concentration reductions of Site associated PFAS in the Cape Fear River. Site associated PFAS concentrations in the Cape Fear River are derived from the PFAS mass loading to the Cape Fear River and the volume of water flowing through the Cape Fear River. PFAS mass load entering the Cape Fear River is defined in this model as the combined mass per unit time or mass load (e.g. nanograms per second) from potential pathways identified in Section 3.3 above. Total PFAS mass load entering the Cape Fear River is calculated as: 𝐶𝐶𝐶𝐶𝐶𝐶𝑇𝑇𝑀𝑀= ⎩⎪⎪⎪⎪⎪⎨⎪⎪⎪⎪⎪⎧��𝑀𝑀𝑛𝑛,𝑖𝑖𝑖𝑖=57 𝑖𝑖=1 𝑛𝑛=9 𝑛𝑛=1 =��𝐶𝐶𝑛𝑛,𝑖𝑖× 𝑄𝑄𝑛𝑛� ∶ 𝑄𝑄𝑛𝑛𝑖𝑖=57 𝑖𝑖=1 →𝑛𝑛=9 𝑛𝑛=1 𝑑𝑑𝑑𝑑𝑑𝑑 (𝐶𝐶𝐹𝐹𝐹𝐹𝑑𝑑𝐹𝐹𝐹𝐹𝑑𝑑𝑑𝑑 2019). ��𝑀𝑀𝑛𝑛,𝑖𝑖𝑖𝑖=57 𝑖𝑖=1 𝑛𝑛=9 𝑛𝑛=1 =��𝐶𝐶𝑛𝑛,𝑖𝑖× 𝑄𝑄𝑛𝑛� ∶ 𝑄𝑄𝑛𝑛𝑖𝑖=57 𝑖𝑖=1 →𝑛𝑛=9 𝑛𝑛=1 𝑑𝑑𝑑𝑑𝑑𝑑 (𝑀𝑀𝐹𝐹𝑑𝑑 2019). ��𝑀𝑀𝑛𝑛,𝑖𝑖𝑖𝑖=57 𝑖𝑖=1 𝑛𝑛=9 𝑛𝑛=1 =��𝐶𝐶𝑛𝑛,𝑖𝑖× 𝑄𝑄𝑛𝑛� ∶ 𝑄𝑄𝑛𝑛𝑖𝑖=57 𝑖𝑖=1 →𝑛𝑛=9 𝑛𝑛=1 𝑤𝑤𝐹𝐹𝑤𝑤 (𝐽𝐽𝐹𝐹𝐽𝐽𝐹𝐹 2019). where, CFRTM = total PFAS mass load entering the Cape Fear River measured in mass per unit time [MT-1], typically nanograms per second. n = represents each of the 9 potential PFAS transport pathways listed in Table 1. To facilitate model construction, the Seeps (Transport Pathway 6) were further discretized as Seep A (Transport Pathway 6A), Seep B (Transport Pathway 6B), Seep C (Transport Pathway 6C) and Seep D (Transport Pathway 6D). PFAS Mass Loading Model Assessment 10 August 26, 2019 i = represents each of the 57 PFAS constituents listed in Table 2. Mn,i = mass load of each PFAS constituent i from each potential pathway n with measured units in mass per unit time [MT-1], typically nanograms per second. Cn,i = concentration of each PFAS constituent i from each potential pathway n with measured units in mass per unit volume [ML-3], typically nanograms per liter. Qn = volumetric flow rate from each potential pathway n with measured units in volume per time [L3T-1], typically liters per second. Three flow conditions, two representing quiescent (dry.) conditions in February 2019 and May 2019, and one storm (wet.) condition in June 2019 are used to compute total PFAS mass load entering the Cape Fear River. The Site associated PFAS mass loading for each potential pathway is estimated using the approaches described in the following sub-sections. These estimates are then used to calculate the total PFAS mass loading of Site related PFAS using the above formula for each of the three discrete flow conditions in February, May and June 2019. A similar analytical mass loading model was previously developed for hexafluoropropylene oxide dimer acid (HFPO-DA) in February 2018 (Appendix A of Parsons, 2018a). Model inputs for each potential pathway (i.e., PFAS concentrations and volumetric flow of water) are a combination of measured data, calculations and professional judgement, as available at the time of model development. Table 1 summarizes the transport pathways and the model input data used for developing this model and is discussed further for each pathway below. The mass loading pathways contributing to the Cape Fear River, as well as the Cape Fear River itself, represent a complex and dynamic environment. To minimize temporal uncertainties in the model, model input analytical samples and flow measurements were collected during three field investigation programs conducted February 1-7, May 20-30 and June 4-7, 2019. Sample locations, methods and results are described in detail in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). The Seeps and Creeks Investigation Report (Geosyntec, 2019b) characterizes the February and May field programs as “dry weather” events representing baseflow conditions. The June 2019 field program was characterized as a “wet weather” event since there was greater than 0.25 inches of rain in the 72 hours prior to sample collection. These field program characterizations are carried forward in this assessment. Further, the model is computed assuming representative model input parameter scenarios that encompass a meaningful range of observed values. The model input parameter scenarios discussed here are used to apportion relative mass loading for each potential pathway and assess how the variability in the possible set of input parameters chosen would affect results. The most representative model input parameter scenario is selected based on a comparison of modeled and PFAS Mass Loading Model Assessment 11 August 26, 2019 empirical mass loading observed at Bladen Bluffs in the Cape Fear River (Section 5). The five model input scenarios for concentrations and flow are: (1) Input parameters assuming 1st Quartile values for concentration and flow; (2) Input parameters assuming median values for concentration and flow; (3) Input parameters assuming 3rd Quartile values for concentration and flow; (4) Input parameters assuming average values for concentration and flow; and, (5) Input parameters assuming geometric mean values for concentration and flow. For each of the three field investigation programs (February, May and June 2019) these model input scenarios were used for this assessment. The following subsections describe how PFAS mass loading from the different PFAS transport pathways listed in Table 1 are estimated in the model and field work that was performed to support these estimations. 4.1 Upstream Cape Fear River (Transport Pathway 1) The upstream PFAS mass loading contribution to Cape Fear River was estimated using measured Cape Fear River PFAS concentration and flow rates as described below (and see Table 1). Sampling locations, analytical methods and assessment techniques for PFAS concentrations in the Cape Fear River are described in detail in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). One water sample was collected immediately upstream of the Site and Willis Creek at River Mile 76 to estimate upstream PFAS mass loading contribution to Cape Fear River. River water samples were collected at the thalweg (i.e., deepest point of the river transect) at mid-depth in the water column. As described in the Seeps and Creeks Investigation Report (Geosyntec, 2019b), additional upstream samples were collected at River Miles -56 and -68 but these were determined to be too far upstream to be representative in this model. PFAS compound analytical data for transport pathway 1 is included in Appendix A. Volumetric flow rates for the Cape Fear River were measured at the USGS flow gauging station located at the W.O. Huske Dam, ID (USGS# 02105500; USGS, 2019), approximately 0.5 river miles downstream of the Site (Appendix B). Volumetric flow rate immediately upstream of the Site (River Mile 76) was estimated using a volumetric budget accounting for flows between River Mile 76 and the W.O. Huske Dam, as depicted in Figure 3. The volumetric flow rate at River Mile 76 was estimated by subtracting inflows from Willis Creek, upwelling groundwater, seeps to the river, and Outfall 002 and by adding the river water intake from Chemours to the flow rate measurement from the W.O. Huske Dam. Due to the short reach between upstream sample PFAS Mass Loading Model Assessment 12 August 26, 2019 location and W.O. Huske Dam, the calculated upstream flow rate was similar (≤ ± 2%) to the measured volumetric flow rate at W.O. Huske Dam during the period of sample collection. 4.2 Tributaries – Willis Creek, Georgia Branch Creek, and Old Outfall 002 (Transport Pathways 2, 7 and 9) Mass loading of PFAS from tributaries to the Cape Fear River used PFAS concentrations and creek flow data (Table 1). Tributaries contributing to PFAS mass loading into the Cape Fear River include Willis Creek, Georgia Branch Creek, and Old Outfall 002. PFAS samples were collected at each tributary at a location near the discharge point to the Cape Fear River, but still far enough upstream in the tributary where they are not potentially influenced by the Cape Fear River. Since analytical sample locations were near the discharge point to the Cape Fear River, model input for tributaries would account for loading from groundwater discharging to the tributary, onsite surface water runoff into the tributary and direct aerial deposition on these tributaries. Analytical results used in the model from each tributary are provided in Appendix A and summarized in Table 3. Sample locations, methods and results are presented in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). Volumetric discharge rates for the tributaries were obtained from three independent flow measurement methods as outlined in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). A summary of the measured and estimated flow values for all tributaries are provided in Table 3 and Appendix B. Detailed methods and results of flow measurements are presented in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). 4.3 Aerial Deposition to the Cape Fear River (Transport Pathway 3) The mass loading from direct aerial deposition of PFAS to the Cape Fear River was estimated using air deposition modeling results for HFPO-DA from the Site (ERM, 2018). Average deposition rates to the Cape Fear River were estimated based on the reported aerial extent and deposition contours. Estimated deposition rates were combined with the average river surface area and estimated residence time of flowing Cape Fear River water to estimate a mass loading from aerial deposition. The mass loading of Table 3+ PFAS compounds was estimated by using the relative concentration ratios of other Table 3+ PFAS to HFPO-DA based on measured concentrations from offsite wells. Supporting documentation for this estimation is included in Appendix C. 4.4 Onsite Groundwater (Transport Pathways 5 and 6) Based on the current characterization of the Site CSM, there are two groundwater PFAS mass loading pathways to the Cape Fear River. First, the indirect pathway of groundwater to seeps to PFAS Mass Loading Model Assessment 13 August 26, 2019 river, and secondly, the direct pathway of Black Creek aquifer groundwater discharging directly to the river. 4.4.1 Indirect Pathway – Groundwater Seeps to River (Transport Pathway 6) Four seeps at the Site have been identified and these discharge directly to the Cape Fear River: Seep A, Seep B, Seep C and Seep D (Figure 2). The PFAS mass loading from these seeps to the Cape Fear River was estimated using measured PFAS concentrations) and flow values that are reported in the Seeps and Creeks Investigation Report (Geosyntec, 2019b) and summarized in Table 3 and Table 4, respectively. Flow rates and PFAS concentrations at Seep A, Seep B and Seep C were measured in February, May and June 2019. Seep D was identified following the February field event, so flow rates and PFAS concentrations were measured in May and June 2019. 4.4.2 Direct Pathway – Groundwater Discharge to River (Transport Pathway 5) The PFAS mass loading of onsite groundwater discharge from the Black Creek Aquifer to the Cape Fear River was developed using a forward assessment based on Darcy’s Law using hydrogeological data as described in detail in Appendix D. The PFAS mass loading from onsite groundwater discharge was estimated using groundwater concentration data from LTW wells at the Cape Fear River bank (Appendix A) and estimated volumetric groundwater discharge (Appendix D). Hydraulic parameters used in the calculation included: (1) hydraulic gradients from measured LTW Well water level data and Cape Fear River water gauge heights reported from USGS (USGS, 2019); (2) estimated representative discharge areas in contact with the Cape Fear River; and (3) estimated hydraulic conductivities. 4.5 Outfall 002 and Facility Stormwater Runoff (Transport Pathway 4) The mass loading of PFAS from Outfall 002 to the Cape Fear River was estimated using measured PFAS concentrations and measured Outfall 002 volumetric flow rates. PFAS concentration data used in the model were compiled from two datasets (Appendix A): (1) composite samples of Outfall 002 water that Chemours collects each week for analysis for HFPO-DA and Table 3+ compounds, and (2) Outfall 002 water samples results reported in the Seeps and Creeks Investigation Report (Geosyntec, 2019b). Comparison of Outfall 002 and river intake sample PFAS concentrations show that all Environmental Protection Agency (EPA) Method 537 PFAS compounds (Table 2) in the Outfall 002 were present in intake water from Cape Fear River and did not originate from the Site (Appendix A) as water passed through the conveyance network. These EPA 537 PFAS compounds were assigned zero concentrations for computing analytical summary statistics (Table 3). Additionally, Table 3+ PFAS compounds for Outfall 002 were input into the model after accounting for their contribution from the Cape Fear River. Daily volumetric discharge from Outfall 002 to the Cape Fear River is recorded (Appendix B) and used in the PFAS PFAS Mass Loading Model Assessment 14 August 26, 2019 Loading Model. These data capture water flowing through Outfall 002, including non-contact cooling water, treated non-Chemours process wastewater (DuPont and Kuraray process water), treated sanitary water and stormwater within the manufacturing area of the Site. 4.6 Offsite Groundwater (Transport Pathway 8) The offsite groundwater PFAS mass loading contributions were estimated by separating offsite discharging groundwater into different zones based on the distance of the selected area from the Site. In each zone, the discharge mass loading was estimated using measured residential well concentrations (Appendix A) and volumetric discharge rate estimated using Darcy’s Law (Appendix E). A detailed description for estimating offsite groundwater mass loading is provided in Appendix E. PFAS Mass Loading Model Assessment 15 August 26, 2019 5. MODEL CALIBRATION AND SENSITIVITY ANALYSIS The PFAS mass loading model was calibrated to help provide reasonable estimates of modeled loading contributions to Cape Fear River. The sensitivity of the model to potential variability of input parameters was assessed to understand the uncertainties in the model and identify parameters that may influence PFAS mass loading to the Cape Fear River. Details of the calibration and sensitivity procedures are described below. 5.1 Model Calibration The mass loading model was calibrated by varying assumed input parameters to achieve a model- estimated, total mass loading in the Cape Fear River generated from all pathways, that best fit with empirical observed mass loading in the river. Empirical mass loading in the Cape Fear River was computed at the Bladen Bluffs raw water intake, approximately 7 miles downstream of the Site (River Mile 84) (Figure 3), to allow for both model calibration and characterization of PFAS at downstream raw water intakes based on the mass loading model assessment. Mass loading at Bladen Bluffs was computed using volumetric flow rates for the Cape Fear River measured at the closest available USGS flow gauging station located at the W.O. Huske Dam and measured analytical results from samples that were collected near the Bladen Bluffs raw water intake (Figure 3). The mathematical summation of Table 3+ compounds (see Table 2 for a list of Table 3+ compounds) was used in the calibration process. The mass loading estimated from the May and June 2019 field programs were included in the calibration since complete Table3+ analytical data from February was not available at the time of this assessment as a final laboratory standard operating protocol (SOP) had yet to be finalized. The model was calibrated by adjusting estimated or measured parameters within ranges of reported variabilities or reasonable uncertainties. Parameters that were calibrated were selected based on the relative uncertainty in estimation of parameter, and the relative mass loading contribution of the transport pathway on modeled loading to the river. Based on a review of model parameters, the onsite and offsite groundwater flow parameters were identified for their relatively high uncertainties in estimating mass loading. Other estimated parameters (e.g., aerial deposition contribution) were evaluated as part of a sensitivity analysis described in Section 5.2. Model calibration was performed by varying the onsite groundwater flow component and the offsite groundwater flow component. The onsite groundwater flow component was varied through (a) modification of the onsite groundwater discharge area; or (b) modification of assumed hydraulic conductivity values for the upper and lower portions of the Black Creek Aquifer (see Appendix D for a description of onsite groundwater flow calculations). The offsite groundwater PFAS Mass Loading Model Assessment 16 August 26, 2019 flow component was varied through modification of assumed hydraulic conductivity values for the Surficial Aquifer. Model parameters that were varied in the calibration process are indicated in Table 5 and briefly described below. While the original model assumed a conservative discharge area of 100% along the entire site-side bank of the Cape Fear River (approximately 1 mile long), calibration iterations were performed by assuming 40% to 75% of this area, limits estimated from available lithologic information. An assessment of Cape Fear River bottom temperatures adjacent to the Site to identify potential zones of groundwater upwelling has been recently completed to refine these estimates. Results from this effort will be reported in the Comprehensive On- and Offsite Assessment Report pursuant to Paragraph 18 of the Consent Order due September 30, 2019. Further, the assumed hydraulic conductivity values for the upper and lower portions of the Black Creek Aquifer was varied between 5x10-7 meters per second (m/s) to 1x10-6 m/s and 1x10-4 m/s to 2x10-4 m/s, respectively. Offsite groundwater flow was varied by modifying the hydraulic conductivity values for the Surficial Aquifer from 2.5 x 10-4 m/s, estimated for onsite surficial aquifer (Parsons, 2018b) to 1 x 10-6 m/s, a literature value assumed for silts and silty sands (Freeze and Cherry, 1979). A total of 21 iterative calibration scenarios were performed to optimize the model-estimated total Table 3+ mass loading in the Cape Fear River to obtain a best fit match to observed mass loading at the Bladen Bluffs raw water intake for May and June 2019 field programs. For each calibration iteration, the estimated total Table 3+ mass loading to the river was compared to empirical loading at Bladen Bluffs, for the same sampling time period and assuming the five input parameter scenarios discussed in Section 4 (1st quartile, median, 3rd quartile, average and geometric mean values for concentration and flow) to assess how the variability in the possible set of input parameters chosen would affect results. Calibrated model-fit was tested through computation of a normalized root mean square error (NRMSE) between modeled and empirical mass loading (Table 5). Calibration results indicate that a lower bound NRMSE of 0.16 was achieved assuming the 1st quartile model input parameter values for nine calibration steps (steps 5, 6, 7, 8, 15, 16, 17, 19, 20; Table 5). To identify a best-fit model amongst these nine calibrations steps, the lowest sum of NRMSE between modeled and empirical mass loading for all five input parameter scenarios was evaluated. Calibration results indicate that a best-fit model was achieved for calibration step 8 assuming the 1st quartile model input parameter values. Figure 4 presents the best-fit model estimated mass loading assuming the 1st quartile model input parameter values with the observed, empirical mass loading at Bladen Bluffs for the same (median, 3rd quartile, average and geometric mean values for concentration and flow) overestimate the observed, empirical mass loading at Bladen Bluffs for the same sampling time period (Table 5) and are not likely to be appropriate model input metrics. The best-fit model identified in calibration step number 8 (Table 5) assumes PFAS Mass Loading Model Assessment 17 August 26, 2019 the following 1st quartile model input parameter values: (a) onsite discharge area of 58%; (b) upper Black Creek Aquifer hydraulic conductivity of 1x10-6 m/s; (c) lower Black Creek Aquifer hydraulic conductivity of 1.5x10-4 m/s; and (d) offsite Surficial Aquifer hydraulic conductivity of 2.5x10-4 m/s. Mass loading model results from this best-fit and calibrated model are discussed in the remainder of this report. Ongoing field work, described in Section 7, is expected to refine some of the parameter estimates discussed here, including refining discharge area estimates and hydraulic conductivity estimates. This calibration iteration was limited to available analytical data collected from two discreet field events in May and June of 2019. Calibration of this model will be an ongoing process that will become more optimized with additional data. 5.2 Model Results The estimated total Table 3+ PFAS loading, by transport pathway, as calculated from the calibrated mass loading model is summarized in Table 6 and presented in Figure 5. The mass loading model estimates that the Old Outfall 002 and Seeps (Transport Pathways 7 and 6 respectively) have the highest contribution of Table 3+ PFAS mass loading to the Cape Fear River based on inputs from both mass loading characterization events (May and June 2019). These two pathways (Transport Pathways 7 and 6) combined contribute approximately 55% of the loading to the Cape Fear River. Onsite groundwater (Transport Pathway 5) is the next highest mass loading pathway to the Cape Fear River. Additional assessments and characterization of this component is currently being undertaken as described in Section 7. A numerical groundwater model is also being prepared to evaluate groundwater interactions with the Cape Fear River and to evaluate the efficacy and support design of potential future actions. The upstream river and groundwater (Transport Pathway 1) is the next highest mass load pathway to the Cape Fear River (4% to 15%). A 10% difference in mass loading between the May and June 2019 characterization events is observed for the upstream river. For upstream river and all Transport Pathways, the loading estimates will vary over time due to a range of possible reasons, including: • Detections of any PFAS at or near analytical practical quantitation limits have more variability; • Elevated method reporting limits; and • Flow rate estimates are over- or under-predicted compared to actual flow rates. Additionally, Transport Pathway 1 (Upstream river water and groundwater) may have additional variability due to the presence of three Table 3+ compounds, Byproduct 4, Byproduct 5 and perfluoroethoxysulfonic acid (NVHOS) which were observed in the upstream Cape Fear River PFAS Mass Loading Model Assessment 18 August 26, 2019 sample collected in May and June 2019 at River Miles 56 and 68. The results for these compounds were J-qualified due to variable recoveries in the matrix spikes outside the acceptable range defined in the SOP which may cause the results to be overestimated. The detection of these compounds is not consistent with known transport pathways for PFAS originating from the facility. Specifically, in offsite groundwater, which is the transport pathway leading to upstream detections attributable to aerial emissions of PFAS from the facility, Perfluoro-2-methoxypropanoic acid (PMPA) is the compound detected at the highest concentrations based on groundwater data reported in the Post Florence Report (Geosyntec, 2019d). Therefore, PMPA is expected to be detected first amongst the PFAS potentially reaching the river from offsite groundwater in the upstream river samples. In samples from River Mile 56, only these three Table 3+ samples are detected. While closer to Site in the upstream river at River Mile 68 PMPA is detected consistent with expected trends from offsite groundwater. These observations of Byproduct 4, Byproduct 5 and NVHOS will be further evaluated spatially and temporally through additional sampling events in the Cape Fear River to further understand their concentration and distribution. Outfall 002 (Transport Pathway 4) contributed 4% – 7% of the total Table 3+ mass load to the Cape Fear River in May and June 2019. Outfall 002 loading rates in 2019, integrating both dry and wet weather periods, are presently 8% lower than in calendar year 2018. This reduction is potentially a result of various completed actions at the Site, including reduced air emissions. Loading at Outfall 002 is expected to continue a downward trajectory year over year. Outfall 002 is further discussed in the Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge and Evaluation of Potential Control Options (Geosyntec, 2019c). Willis Creek and Georgia Branch Creek (Transport Pathways 2 and 9, respectively) are modeled to contribute between 7% to 14% of the total Table 3+ mass load to the Cape Fear River in May and June 2019. The variation seen in the mass loading contribution is likely due to the possible reasons listed above. As noted in Section 7, additional wells are being installed adjacent to Willis Creek and Georgia Branch Creek to monitor groundwater quality near these tributaries. Aerial deposition and Offsite Groundwater (Transport Pathways 3 and 8, respectively) contributed less than 0.5% of the total mass loading to the Cape Fear River in May and June 2019. The mass loading model that has been developed can accurately simulate concentrations of PFAS originating from the Site at downstream intakes over time as shown in Figure 6 for Kings Bluff Intake Canal. This plot shows the measured concentrations of HFPO-DA from both raw and finished water samples collected at Kings Bluff Intake Canal compared to modeled concentrations estimated from the mass loading model. HFPO-DA was selected in this representation because of its low detection limit and the availability of public data for the time period simulated. To simulate the modeled time series, the model incorporated the twice weekly Outfall 002 sample concentration results, measured Outfall 002 flow rates and Cape Fear River flow volumes; all other loading parameters developed for the calibrated model were kept constant. This suggests that the PFAS Mass Loading Model Assessment 19 August 26, 2019 model is also a useful predictive tool to understand the benefit of potential PFAS mass loading reductions to river loads and concentrations. 5.3 Sensitivity Analysis A sensitivity analysis was performed to assess potential uncertainties in modeled results, specifically how the potential range of model input parameters values affects the estimated PFAS mass loads in the Cape Fear River. Model input parameters for the following Transport Pathways are included in the sensitivity analysis: (a) Aerial deposition rates on the Cape Fear River; (b) Flow rates at Willis Creek, Georgia Branch, Old Outfall 002 and Seep A, Seep B, Seep C and Seep D; (c) Onsite groundwater flow rates; and (d) Offsite groundwater discharge rates. For each test, one of the above Transport Pathway inputs to the calibrated model is varied and the resulting model estimated Total Table 3+ PFAS mass loading is compared with the original calibrated model Total Table 3+ PFAS mass loading. Results of the sensitivity analyses are summarized in Appendix F and described below for each of the Transport Pathways. (a) Aerial deposition – Aerial deposition of PFAS directly on the Cape Fear River, identified as Transport Pathway Number 3, is estimated using air deposition modeling results for HFPO-DA in October 2018 as described in Appendix C (ERM, 2018). To test the sensitivity of the model to variations in model inputs for this pathway, calculated HFPO-DA deposition on the Cape Fear River was increased six-fold. However, this six-fold increase only resulted in less than 0.5% variation in Total Table 3+ estimated mass loading, suggesting that the mass loading is not very sensitive to variations in Transport Pathway model input. (b) Flow rates at seeps and tributaries – Flow rates at Willis Creek were first decreased by 10% and 50 % and then increased by the same amount (Appendix F). This variation in flow rate input at Willis Creek only resulted in less than 5% variation in estimated Total Table 3+ estimated mass loading, suggesting that this pathway model input is not very sensitive. Flow rates at Seep A, Seep B, Seep C and Seep D were varied by ±50%. A 50% reduction in seep flow yields less than 8 % decrease in Total Table 3+ estimated mass loading, driven by sensitivity to flows at Seep A and Seep B. A similar 50% increase in seep flow yields less than 14 % increase in Total Table 3+ estimated mass loading, driven by sensitivity to flows at Seep A and Seep B. This suggests that Total Table 3+ estimated mass loading is likely moderately sensitive to seep flow input variations. Sensitivity of Total Table 3+ estimated mass loading to flow rates at Old Outfall 002 were tested by varying measured flow values by ±50% and +100%. A ±50% variation in flow at the Old Outfall 002 yields a 9% to 16% variation in Total Table 3+ estimated mass loading. A +100% variation in flow at the Old Outfall 002 yields a 16% to 21% variation in Total Table 3+ estimated mass loading. These results suggest that the estimated mass loading is moderately sensitive to Old Outfall 002 flow input variations. Flow rates at Georgia Branch Creek were also varied ±50% to yield a ≤ 2% variation PFAS Mass Loading Model Assessment 20 August 26, 2019 in Total Table 3+ estimated mass loading, suggesting that the mass loading is not very sensitive to variations in Transport Pathway model input. (c) Onsite groundwater flow – As discussed in Section 5, onsite groundwater model input parameters were varied during the calibration process. Model sensitivity to onsite groundwater flow is evaluated through adjusting the discharge area parameter (see also Appendix D and Appendix F). Results show that a 35% increase in discharge area resulted in a 16% increase in Total Table 3+ estimated mass loading. This suggests that the mass loading is moderately sensitive to variations in Transport Pathway model input. (d) Offsite groundwater flow - Model sensitivity to offsite groundwater flow is tested through variation of the assumed hydraulic conductivity over two orders of magnitude (Appendix F). However, this large variation in model input only resulted in less than 0.5% variation in Total Table 3+ estimated mass loading, suggesting that the mass loading is not very sensitive to variations in Transport Pathway model input. In summary, the Total Table 3+ estimated mass loading appears to be most sensitive to flow rates at the Seeps, Old Outfall 002 and onsite groundwater flux. Additionally, the model sensitivity to variations in reported analytical concentrations that are close to their practical quantitation limits was evaluated. A small increase in analytical concentrations close to their practical quantitation limits, that may be attributable to natural variations or when considering tolerance on QA recoveries, could lead to an analyte detection and additional mass loading. Mass loading is likely to be appreciable in such a scenario for a pathway with a large flow component. The upstream Cape Fear River sample location at River Mile 76, is chosen for this assessment because of its large flow component and analytical results from this sample displayed a number of non-detects in May (40 PFAS compounds non-detect) and June (37 PFAS compounds non-detect). Model sensitivity is evaluated by calculating Total Table 3+ estimated mass loading for Transport Pathway 1, assuming all analytical results lower than the detection limits (i.e., non-detect) values equal to their reporting limit and comparing with the original model, which assumed non-detect values to be zero. Non-detect values were not assumed equal to their reporting limit in the original model input because Total Table 3+ estimated mass loading from the model grossly overestimated the observed empirical Total Table 3+ mass loading at Bladen Bluffs raw water intake due to the large number of non-detects reported in the model dataset. Comparison of Total Table 3+ estimated mass loading for Transport Pathway 1 suggests that assuming non-detect values to be equal to their reporting limit increases their pathway contribution from 8% to 20%. While the upstream Cape Fear River sample at River Mile 76 maybe an extreme sample due to the large number of analytes that were lower than the detection limits, it is evident that the model can be highly sensitive to reported analytical concentrations that are close to their method detection limits. Model sensitivity is likely to be larger as the analytical result gets closer to the method detection limit. As analytical methods improve and detection limits get lower, the model and inherent assumptions will likely need to be re-evaluated. PFAS Mass Loading Model Assessment 21 August 26, 2019 6. LIMITATIONS AND ASSUMPTIONS The mass loading model constructed, calibrated, and applied is a quantitative estimate of the current understanding of the conceptual site model and transport pathways. It is based on availability of data points, and thus in a complex and dynamic environment, there are unavoidable uncertainties. The model was constructed based on discrete field-observations, which were then interpolated to approximate conditions across the model domain and assumed to be representative in between the measured points. This model is useful to identify distributions in mass loading to the Cape Fear River for a range of conditions and support identification of potential target pathways for actions to achieve objectives for mass loading and corresponding concentration reductions of PFAS originating from the facility in the Cape Fear River. This section summarizes the primary uncertainties associated with this model, the physical characterization and potential impacts of the uncertainty. • Model assessment was primarily developed with available analytical data from three discrete events in 2019 (February, May and June). While seasonal or temporal trends may be captured within these events, a larger input dataset to the model may improve model calibration and its ability to predict mass loading in a dynamic and complex system such as the Cape Fear River. Additional sampling of Seeps and Creeks is planned for, including the installation of flumes to obtain more accurate flow measurements (Geosyntec, 2019b). A numerical groundwater model is being developed and this may help constrain these uncertainties. • The groundwater mass loading pathway has much more uncertainty than other pathways because it is based on measured concentrations and estimated flow values that have more inherent variability. Groundwater flow is heterogenous, and hydraulic conductivity can vary by orders of magnitude in the same aquifer. Consequently, this leads to a broader uncertainty in groundwater discharge rates. A river bottom temperature field program has been completed to assess if areas of onsite groundwater discharge can be identified. • Offsite groundwater data is currently based on limited data from residential wells at the time of this assessment. Estimates of additions of Table 3+ compounds from offsite groundwater to the Cape Fear River could be refined with additional PFAS characterization of the Cape Fear River as better analytical capabilities exist for Table 3+ than in June 2018 when the first regional river sampling program was implemented (Geosyntec, 2018b). PFAS Mass Loading Model Assessment 22 August 26, 2019 7. SUPPLEMENTAL ACTIVITIES Geosyntec recommends Chemours conduct additional assessment activities regarding the total PFAS loading originating from the facility. These activities will generate additional data that will support continued refinement of the mass loading model. These activities include: • Completing six additional quarterly assessments of mass loading to the Cape Fear River. Activities in these events will include sampling and flow gauging at the mouths of Seeps A through D, Old Outfall 002, Outfall 002, Willis Creek, Georgia Branch Creek. Also, samples will be collected upstream and downstream of the Site in the Cape Fear River; • Conducting an assessment of Cape Fear River bottom sediment temperatures adjacent to the Site to identify potential zones of increased groundwater upwelling. This will be reported in the On and Offsite Assessment Report due on September 30, 2019; • Conducting further site investigation and characterization activities, including the installation of additional monitoring wells onsite to further delineate PFAS concentrations and geology. Multiple wells have been installed as noted below to further assess hydrogeology and groundwater PFAS concentrations. These wells will be reported in the On and Offsite Assessment Report due on September 30, 2019. o Fifteen additional wells installed adjacent to the Cape Fear River (six pre-existing wells); o Two additional wells installed adjacent to Old Outfall 002 (ten wells were installed adjacent to Old Outfall 002 as part of the PlumeStop™ pilot study (Parsons, 2019); o One well installed adjacent to Willis Creek (four pre-existing wells); and o Three wells installed adjacent to Georgia Branch Creek (no pre-existing wells). • Characterizing further the geology and hydrogeology at 24 locations adjacent to the Cape Fear River using hydraulic profiling and electrical conductivity (HPT/EC) tools. This characterization will be reported in the On and Offsite Assessment Report due on September 30, 2019; • Preparing a numerical model to evaluate groundwater flow conditions in the three water bearing units at Site and evaluate groundwater interactions with the Cape Fear River, to assess the efficacy and support design of potential future actions. This will be prepared to support the Corrective Action Plan due December 31, 2019; and • Installing 20 offsite monitoring wells to support further understanding of the horizontal and vertical distribution of PFAS originating from the facility potentially present offsite. These wells will be reported in the On and Offsite Assessment Report due on September 30, 2019. PFAS Mass Loading Model Assessment 23 August 26, 2019 8. CONSENT ORDER PARAGRAPH 11.1 ANALYSIS Pursuant to Paragraph 11.1 of the Consent Order, this analysis estimates the percentage of PFAS loading detected at downriver raw water intakes as originating from Chemours, other, or unknown sources. Specifically, the Consent Order requires: Chemours shall submit an analysis to DEQ reporting contributions of PFAS (including identification and mass loading of each PFAS) from the Facility to the raw water intakes of downstream public water utilities. To facilitate this analysis, Chemours collected samples from the Cape Fear River adjacent to the Bladen Bluffs and Kings Bluff raw water intakes in May and June 2019 (Creeks and Seeps Investigation; Geosyntec, 2019b) and analyzed these samples to quantitate PFAS by laboratory methods Table 3+ and EPA 537. The total concentrations for these samples are presented in Tables 8A to 8D and in the intext table below along with the attribution of each compound to the three identified categories of sources. These sources are as follows: • PFAS Originating from the Site – This includes PFAS detected in the Cape Fear River that were assessed to originally or directly have come from PFAS releases to the environment at the Site and have reached the Cape Fear River via one of the nine transport pathways described in Section 3.3; • PFAS Originating from Other Sources – This includes PFAS detected in the Cape Fear River that were assessed to come from sources other than the Site; • PFAS Originating from Unknown Sources – This includes PFAS where the source may potentially either be the facility or other sources, but with the presently available data, the source type could not be determined. On a total PFAS basis this analysis indicates that at the Bladen Bluffs and Kings Bluff raw water intakes for the May and June 2019 sampling events, between 68% to 84% of PFAS quantitated and detected originate from the Site (Figure 7). Meanwhile, for these quantitated and detected compounds, between 13% and 29% originate from other sources and 2% to 3% originate from unknown sources. Actions proposed by Chemours in the Reductions Plan (Geosyntec, 2019d) and the upcoming Corrective Action Plan due on December 31, 2019 will reduce the total PFAS loading to the Cape Fear River and significantly reduce the loading originating from the facility as is described in the Reductions Plan. PFAS Mass Loading Model Assessment 24 August 26, 2019 Location Samp-ling Event Concentration (ng/L) Percentage (%) Total Observed PFAS Concentra-tion (ng/L) PFAS Originating from Facility PFAS Originating from Other Sources PFAS Originating from Unknown Sources PFAS Originating from Facility PFAS Originating from Other Sources PFAS Originating from Unknown Sources Bladen Bluffs May-19 361 288 67 6 80% 19% 2% Jun-19 188 478 89 16 82% 15% 3% Kings Bluff May-19 582 129 54 5 68% 29% 3% Jun-19 600 507 77 17 84% 13% 3% * Note, values may differ slightly from attached tables due to rounding of significant digits for table presentation. 8.1 Assessment Methodology Observed PFAS mass loading at Bladen Bluffs and Kings Bluff raw water intakes were estimated based on measured concentrations and flow rates during the May 2019 and June 2019 characterization events (Tables 7A and 7B). The contributions per PFAS compound and Transport Pathway to the total mass loading for each of these events were estimated using (1) the percentage of the total mass loading attributed to each Transport Pathway based on the outcome of the mass loading model assessment and (2) the estimated source of PFAS origination per compound per Transport Pathway (Tables 8A, 8B, 8C, and 8D). The best-fit modeled mass loading for each Transport Pathway are presented for the May 2019 and June 2019 characterization events in Tables 9A and 9B, respectively. The subsequent estimated percentage of each Transport Pathway to the mass loading are presented by compound in Tables 10A and 10B for the May 2019 and June 2019 characterization events, respectively. The observed PFAS mass loading at Bladen Bluffs and Kings Bluff were distributed to each Transport Pathway based on these percentages. Table 11 summarizes the estimated origination source of PFAS mass loading by compound and Transport Pathway. Percentages of PFAS mass loading generated from the Site, Other sources, or Unknown sources were estimated per compound and per Transport Pathway. The observed PFAS mass loading from each Transport Pathway were distributed based on the source origination percentages to estimate the portion of PFAS loading originating from the Site, Other, and Unknown sources. 8.1.1 PFAS Compound Source Origination Assessment The source origination assessment for each Transport Pathway was developed as described below. PFAS Mass Loading Model Assessment 25 August 26, 2019 For Transport Pathway 1 (Upstream River): Table 3+ compounds were estimated to originate from the Site with the exception of Byproduct 4, Byproduct 5 and NVHOS whose detection in upstream river samples was not consistent with known loading pathways for PFAS originating from the Site. The fraction of these compounds originating from the Site was calculated using June event Table 3+ data where the River Mile 76 concentrations of each of the three compounds were subtracted from the River Mile 56 concentrations of each of the three compounds and then divided by the River Mile 76 concentration. The remainder contribution was estimated to originate from Unknown sources. All EPA 537 compounds were estimated to originate from Other sources. For Transport Pathways 2, 5, 6, and 7 (Willis Creek, Onsite Groundwater, Seeps and Old Outfall 002: All Table 3+ compounds were estimated to originate from the Site. For the EPA 537 compounds, the percentage increase between the median Pathway concentration for all sampling events and the median Upriver [Transport Pathway 1] concentration for all sampling events were estimated to originate from the Site. If the Pathway median was not detected or less than the Upriver concentration, then the contribution from the Site was estimated to be 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources. For Transport Pathway 3 (Aerial Deposition on River): All Table 3+ compounds were estimated to originate from the Site. All EPA 537 compounds were estimated to originate from Other sources. For Transport Pathway 4 (Outfall 002): All Table 3+ compounds and EPA 537 compounds were estimated to originate from the Site. This Pathway only represents new loading introduced by the Site to the river by Outfall 002 and does not account for any offsite loading. For Transport Pathway 8 (Adjacent and Downstream Groundwater): All Table 3+ compounds were estimated to originate from the Site. For the EPA 537 compounds, the percentage increase between the estimated median offsite groundwater concentration and the median Upriver [Transport Pathway 1] concentration for all sampling events was estimated to originate from Unknown sources. If the estimated median offsite groundwater concentration was not detected or less than the median Upriver concentration, then the Unknown portion was considered 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources. For Transport Pathway 9 (Georgia Branch Creek): All Table 3+ compounds were estimated to originate from the Site. For the EPA 537 compounds, the percentage increase between the median Pathway concentration for all sampling events and the median Upriver [Transport Pathway 1] concentration for all sampling events was estimated to originate from Unknown sources. If the median Pathway concentration was not detected or less than the median Upriver concentration, then the Unknown portion was considered 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources. PFAS Mass Loading Model Assessment 26 August 2019 9. SUMMARY A mass loading model was developed to inform a plan to reduce PFAS to the Cape Fear River from the Chemours Fayetteville Works Site pursuant to Paragraph 12 of the executed CO dated 25 February 2019 among NCDEQ, Cape Fear River Watch, and Chemours. The objective of the model is to identify which of the nine potential transport pathways, presently identified in the CSM, contribute significant PFAS load, originating from the Site, to the Cape Fear River. This objective is accomplished by estimating total PFAS mass loading originating from the facility to the Cape Fear River, including estimates of loading from each of the potential transport pathways identified, and comparing these estimates to empirically measured PFAS loading in the Cape Fear River. PFAS mass loading is defined, in this model, as the combined mass per unit time (e.g. nanograms per second) from potential sources. The model estimates PFAS contributions from multiple pathways (i.e. compartments), such as various creeks and groundwater, that have been parameterized primarily using measured data (Geosyntec, 2019b), to estimate Cape Fear River mass loading using measured Cape Fear River flow volumes. These estimated mass loading are then compared to measured in-river mass loading as an assessment of model calibration. For each calibration iteration, the estimated total Table 3+ mass loading to the river was compared to empirical loading at Bladen Bluffs, for the same sampling time period (May and June 2019) and five input parameter scenarios (1st quartile, median, 3rd quartile, average and geometric mean values for concentration and flow). Five input parameter scenarios were chosen to assess how the variability in the possible set of input parameters chosen would affect results and apportion relative mass loading for each potential pathway. The most representative model input parameter scenario is selected based on computation of a NRMSE between modeled and empirical mass loading observed at Bladen Bluffs in the Cape Fear River. The best-fit model identified in calibration assumes the following 1st quartile model input parameter values: (a) onsite discharge area of 58%; (b) upper Black Creek Aquifer hydraulic conductivity of 1x10-6 m/s; (c) lower Black Creek Aquifer hydraulic conductivity of 1.5x10-4 m/s; and (d) offsite Surficial Aquifer hydraulic conductivity of 2.5x10-4 m/s. The mass loading model estimates that the Old Outfall 002 and Seeps (Transport Pathways 7 and 6 respectively) have the highest contribution of approximately 53% to 55% of the Table 3+ PFAS mass loading to the Cape Fear River based on inputs from both mass loading characterization events (May and June 2019). Onsite groundwater (Transport Pathway 5) is the next highest mass loading pathway to the Cape Fear River between 17% and 22%. Additional assessments and characterization of onsite groundwater is currently being undertaken. A numerical groundwater model is also being prepared to evaluate groundwater interactions with the Cape Fear River and to evaluate the efficacy and support design of potential future actions. Additionally, six more PFAS Mass Loading Model Assessment 27 August 2019 quarterly field events evaluating mass loading to the river will be used to assess and refine these mass loading findings over time and in different weather and season conditions. An assessment of PFAS loading at downriver raw water intakes was performed pursuant to Paragraph 11.1 of the Consent Order, using a combination of mass loading model assessment results and observed PFAS concentrations at Raw Water Intake. An estimate of the percentage of PFAS loading at downriver raw water intakes as originating from the Site, other sources or at present unknown sources which could be either the facility or the other sources was evaluated. On a total PFAS basis, this analysis indicated that at Bladen Bluffs and Kings Bluff raw water intakes for the May and June 2019 sampling events, between 68% to 84% of PFAS may have originated from the Site. Meanwhile for these quantitated and detected compounds between 13% to 29% originate from other sources and 2% to 3% originate from unknown sources. Actions proposed by Chemours in the Reduction Plan (Geosyntec, 2019d) and the upcoming Corrective Action Plan due on December 31, 2019 will reduce the total PFAS loading to the Cape Fear River and significantly reduce the loading originating from the facility as is described in the Reduction Plan. The mass loading model constructed, calibrated, and applied is a quantitative estimate of the current understanding of the conceptual site model and transport pathways. It is based on availability of data points, and thus in a complex and dynamic environment, there are unavoidable uncertainties. The model was constructed based on discrete field-observations, which were then interpolated to approximate conditions across the model domain and assumed to be representative in between the measured points. This model is useful to identify trends in mass loading to the Cape Fear River for a discreet range of conditions and support identification of potential target pathways for actions to achieve objectives for mass loading and corresponding concentration reductions of Site associated PFAS in the Cape Fear River. PFAS Mass Loading Model Assessment 28 August 2019 10. REFERENCES ERM, 2018. Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Freeze, R. A. and J. A. Cherry. 1979. Groundwater, Prentice Hall, Englewood Cliffs, N.J. Geosyntec, 2018a. Assessment of Impact of Current and Anticipated Reduced Air Emissions on Groundwater Concentrations of HFPO Dimer Acid in the Vicinity of the Chemours Fayetteville Works. 27 April 2018. Geosyntec, 2018b. Assessment of the Chemical and Spatial Distribution of PFAS in the Cape Fear River. Chemours Fayetteville Works. 17 September 2018. Geosyntec, 2019a. Cape Fear River PFAS Mass Loading Model Scope of Work. Chemours Fayetteville Works. 12 April 2019. Geosyntec, 2019b. Seeps and Creeks Investigation Report. Chemours Fayetteville Works. 26 August 2019. Geosyntec, 2019c. Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge and Evaluation of Potential Control Options. Chemours Fayetteville Works. 26 August 2019. Geosyntec, 2019d. Post Hurricane Florence PFAS Characterization. Chemours Fayetteville Works. April 2019 Parsons, 2018. Additional Site Investigation Report. 30 March 2018. Parsons, 2019. Old Outfall 002 Remedial Options Plan. Chemours Fayetteville Works. May 2019. USGS, 2019. National Water Information System: Web Interface. Accessed March 2019. https://waterdata.usgs.gov/nwis/uv?site_no=02105500 TABLES TABLE 1 PFAS MASS LOADING MODEL POTENTIAL PATHWAYS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Transport Pathway Number Potential PFAS Transport Pathway Analytical Data Source for Mass Loading Model1 Flow Data Source for Mass Loading Model1 1 Upstream River and Groundwater Measured from Cape Fear River samples collected in February, May, and June 2019 as reported in Seeps and Creeks Investigation Report2. Measured flow rates from USGS gauging station at W.O. Huske Dam during February, May and June 2019 volumetrically adjusted for flow pathways between River Mile 76 and W.O. Huske Dam3. 2 Willis Creek Measured from Willis Creek samples collected in February, May, and June 2019 as reported in Seeps and Creeks Investigation Report2. Measured flow rates through salt dilution tests, weir gauging and point velocity methods during February, May and June 2019 as reported in Seeps and Creeks Investigation Report2. 3 Aerial Deposition on River Estimated from air deposition modeling4.Estimated from air deposition modeling4. 4 Outfall 002 Measured from Outfall 002 samples collected in February, May, and June 2019 as reported in Seeps and Creeks Investigation Report2.Measured daily Outfall 002 flow rates. 5 Onsite Groundwater Measured from LTW well samples in October and November 2018, reported in Post Florence Report5. Estimated from calculated hydraulic gradients based on June 2019 water levels and hydraulic conductivities of LTW wells from slug tests performed in 2019. Supporting calculations provided in Appendix C. 6 Seeps Measured from Seeps A, B, C, and D samples collected in February, May, and June 2019 as reported in Seeps and Creeks Investigation Report2. Measured flow rates through salt dilution tests, weir gauging and point velocity methods during February, May and June 2019 as reported in Seeps and Creeks Investigation Report2. 7 Old Outfall 002 Measured from Old Outfall 002 samples collected in February, May, and June 2019 as reported in Seeps and Creeks Investigation Report2. Measured flow rates through salt dilution tests, weir gauging and point velocity methods during February, May and June 2019 as reported in Seeps and Creeks Investigation Report2. 8 Adjacent and Downstream Groundwater Estimated from residential well samples collected between September 2017 and April 2019. Supporting calculations provided in Appendix D. Estimated from calculated hydraulic gradients based on June 2019 water levels and calculated hydraulic conductivities of LTW wells from slug tests performed in 2019. Supporting calculations provided in Appendix D. 9 Georgia Branch Creek Measured from Georgia Branch Creek samples collected in May, and June 2019 as reported in Seeps and Creeks Investigation Report2. Measured flow rates through salt dilution tests, weir gauging and point velocity methods during February, May and June 2019 as reported in Seeps and Creeks Investigation Report2. Notes 1. Flow and concentration data are multiplied together to estimate the PFAS mass load in the Cape Fear River originating from each pathway. 2. Seeps and Creeks Investigation Report, Geosyntec, 2019. 3. Cape Fear River flow rates measured at USGS gauging station #02105500 located at William O Huske Lock & Dam accessed from https://waterdata.usgs.gov on 2019-07-12 23:42:42 EDT. 4. ERM, 2018. Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. 5. Post Hurricane Florence PFAS Characterization Report, Geosyntec 2019. August 2019 TABLE 2 ANALYTICAL METHODS AND ANALYTE LIST Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Analytical Method Common Name Chemical Name CASN Chemical Formula HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 C6HF11O3 PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 C5HF9O3 PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 C12H9F9O3S PFMOAA Perfluoro-2-methoxyacetic acid 674-13-5 C3HF5O3 PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 C4HF7O4 PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 C5HF9O5 PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 C6HF11O6 PMPA 2,3,3,3-Tetrafluoro-2-(trifluoromethoxy)propanoic 13140-29-9 C4HF7O3 Hydro-EVE Acid Hydro-EVE Acid 773804-62-9 C8H2F14O4 EVE Acid Perfluoroethoxypropionic acid 69087-46-3 C8HF13O4 PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 C5HF9O4 R-EVE R-EVE EVS1428 C8H2F12O5 PFO5DA Perfluoro-3,5,7,9,11- pentaoxadodecanoic acid 39492-91-6 C7HF13O7 Byproduct 4 Byproduct 4 EVS1429 C7H2F12O6S Byproduct 5 Byproduct 6 EVS1430 C6H2F12O4S Byproduct 6 Byproduct 5 EVS1431 C7H3F11O7S NVHOS NVHOS 1132933-86-8 C4H2F8O4S PES PES 113507-82-7 C4HF9O4S PFESA-BP1 PFESA-BP1 29311-67-9 C7HF13O5S PFESA-BP2 PFESA-BP2 749836-20-2 C7H2F14O5S PFBA Perfluorobutanoic acid 375-22-4 C4HF7O2 PFDA Perfluorodecanoic acid 335-76-2 C10HF19O2 PFDoA Perfluorododecanoic acid 307-55-1 C12HF23O2 PFHpA Perfluoroheptanoic acid 375-85-9 C7HF13O2 PFNA Perfluorononanoic acid 375-95-1 C9HF17O2 PFOA Perfluorooctanoic acid 335-67-1 C8HF15O PFHxA Perfluorohexanoic acid 307-24-4 C6HF11O2 PFPeA Perfluoropentanoic acid 2706-90-3 C5HF9O2 PFTeA Perfluorotetradecanoic acid 376-06-7 C14HF27O2 PFTriA Perfluorotridecanoic acid 72629-94-8 C13HF25O2 PFUnA Perfluoroundecanoic acid 2058-94-8 C11HF21O2 PFBS Perfluorobutanesulfonate 375-73-5 C4HF9SO PFDS Perfluorodecanesulfonate 335-77-3 C10HF21O3S PFHpS Perfluoroheptanesulfonic acid 375-92-8 C7HF15O3S PFHxS Perfluorohexanesulfonic acid 355-46-4 C6HF13SO3 PFNS Perfluorononanesulfonate 68259-12-1 C9HF19O3S PFOS Perfluorosulfonic acid 1763-23-1 C8HF17SO3 PFPeS Perfluoropentane sulfonic acid 2706-91-4 C5HF11O3S 10:2 FTS Fluorotelomer sulfonate 10:2 120226-60-0 C12H5F21O3 4:2 FTS Fluorotelomer sulfonate 4:2 757124-72-4 C6H5F9O3S 6:2 FTS Fluorotelomer sulfonate 6:2 27619-97-2 C8H5F13SO3 8:2 FTS Fluorotelomer sulfonate 8:2 39108-34-4 C10H5F17O3S NEtFOSAA N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 C12H8F17NO4S NEtPFOSA N-ethylperfluoro-1-octanesulfonamide 4151-50-2 C10H6F17NO2S NEtPFOSAE N-ethyl perfluorooctane sulphonamidoethanol 1691-99-2 C12H10F17NO3S NMeFOSAA N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 C11H6F17NO4S NMePFOSA N-methyl perfluoro-1-octanesulfonamide 31506-32-8 C9H4F17NO2S NMePFOSAE N-methyl perfluorooctane sulfonamidoethanol 24448-09-7 C11H8F17NO3S PFDOS Perfluorododecanesulfonic acid 79780-39-5 C12HF25O3S PFHxDA Perfluorohexadecanoic acid 67905-19-5 C16HF31O2 PFODA Perfluorooctadecanoic acid 16517-11-6 C18HF35O2 PFOSA Perfluorooctane Sulfonamide 754-91-6 C8H2F17NO2S F-53B Major F-53B Major 73606-19-6 C8HClF16O4S F-53B Minor F-53B Minor 83329-89-9 C10HClF20O4S ADONA 4,8-dioxa-3H-perfluorononanoate 958445-44-8 C7H2F12O4 NaDONA NaDONA EVS1361 -- DONA DONA 919005-14-4 -- Notes: 1. Abbreviations: EPA - Environmental Protection Agency ng/L - nanograms per liter PFAS - Per- and Polyfluoroalkyl substances SOP - Standard Operating Procedure Table 3+ Lab SOP EPA Method 537 Mod August 2019 TABLE 3 SUMMARY OF ANALYTICAL RESULTS – TOTAL PFAS AND TOTAL TABLE 3+ Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Transport Pathway Number Potential PFAS Transport Pathway Common Name Sampling Event 1st Quartile Concentration (ng/L) Median Concentration (ng/L) 3rd Quartile Concentration (ng/L) Average Concentration (ng/L) Geometric Mean Concentration (ng/L) Total Table 3+Surface Water 02/19 2.9 2.9 2.9 2.9 2.9 Total PFAS Surface Water 02/19 31.7 31.7 31.7 31.7 31.7 Total Table 3+Surface Water 05/19 12.8 12.8 12.8 12.8 12.8 Total PFAS Surface Water 05/19 67.1 67.1 67.1 67.1 67.1 Total Table 3+Surface Water 06/19 69.6 69.6 69.6 69.6 69.6 Total PFAS Surface Water 06/19 162.7 162.7 162.7 162.7 162.7 Total Table 3+Surface Water 02/19 2,048.5 2,260.0 2,471.5 2,260.0 2,163.6 Total PFAS Surface Water 02/19 2,075.0 2,286.5 2,498.0 2,286.5 2,190.1 Total Table 3+Surface Water 05/19 5,751.5 6,579.0 7,406.5 6,579.0 6,217.7 Total PFAS Surface Water 05/19 5,799.5 6,627.0 7,454.5 6,627.0 6,265.7 Total Table 3+Surface Water 06/19 2,692.4 2,692.4 2,692.4 2,692.4 2,692.4 Total PFAS Surface Water 06/19 2,732.9 2,732.9 2,732.9 2,732.9 2,732.9 Total Table 3+Surface Water 02/19 26.4 26.4 26.9 26.7 26.7 Total PFAS Surface Water 02/19 26.4 26.4 26.9 26.7 26.7 Total Table 3+Surface Water 05/19 357.2 594.7 832.3 594.7 318.3 Total PFAS Surface Water 05/19 357.2 594.7 832.3 594.7 318.3 Total Table 3+Surface Water 06/19 798.7 973.4 1,696.0 1,338.6 1,046.2 Total PFAS Surface Water 06/19 798.7 973.4 1,696.0 1,338.6 1,046.2 Total Table 3+Surface Water 02/19 203,062.0 213,337.0 223,612.0 213,337.0 211,983.3 Total PFAS Surface Water 02/19 204,040.6 214,315.6 224,590.6 214,315.6 212,961.9 Total Table 3+Surface Water 05/19 297,520.5 300,574.0 302,574.0 299,871.7 299,679.2 Total PFAS Surface Water 05/19 298,792.3 301,875.8 303,877.9 301,154.9 300,961.8 Total Table 3+Surface Water 06/19 197,620.0 197,620.0 197,620.0 197,620.0 197,620.0 Total PFAS Surface Water 06/19 198,495.9 198,495.9 198,495.9 198,495.9 198,495.9 Total Table 3+Surface Water 02/19 345,036.5 347,829.0 350,621.5 347,829.0 347,662.8 Total PFAS Surface Water 02/19 347,462.5 350,255.0 353,047.5 350,255.0 350,088.8 Total Table 3+Surface Water 05/19 309,023.0 309,023.0 309,023.0 309,023.0 309,023.0 Total PFAS Surface Water 05/19 310,903.5 310,903.5 310,903.5 310,903.5 310,903.5 Total Table 3+Surface Water 06/19 338,288.0 338,288.0 338,288.0 338,288.0 338,288.0 Total PFAS Surface Water 06/19 340,652.0 340,652.0 340,652.0 340,652.0 340,652.0 Total Table 3+Surface Water 02/19 343,584.0 346,679.0 348,429.0 345,782.3 345,737.2 Total PFAS Surface Water 02/19 345,981.3 349,077.5 350,828.8 348,180.8 348,135.6 Total Table 3+Surface Water 05/19 347,669.0 347,669.0 347,669.0 347,669.0 347,669.0 Total PFAS Surface Water 05/19 350,121.4 350,121.4 350,121.4 350,121.4 350,121.4 Total Table 3+Surface Water 06/19 346,000.0 346,000.0 346,000.0 346,000.0 346,000.0 Total PFAS Surface Water 06/19 348,447.3 348,447.3 348,447.3 348,447.3 348,447.3 Total Table 3+Surface Water 02/19 NS NS NS NS NS Total PFAS Surface Water 02/19 NS NS NS NS NS Total Table 3+Surface Water 05/19 164,470.0 166,685.0 168,900.0 166,685.0 166,562.5 Total PFAS Surface Water 05/19 165,567.6 167,791.7 170,015.7 167,791.7 167,669.0 Total Table 3+Surface Water 06/19 155,467.0 155,467.0 155,467.0 155,467.0 155,467.0 Total PFAS Surface Water 06/19 156,629.9 156,629.9 156,629.9 156,629.9 156,629.9 Total Table 3+Surface Water 02/19 129,320.0 133,040.0 136,760.0 133,040.0 132,784.7 Total PFAS Surface Water 02/19 129,320.0 133,040.0 136,760.0 133,040.0 132,784.7 Total Table 3+Surface Water 05/19 112,930.0 112,930.0 112,930.0 112,930.0 112,930.0 Total PFAS Surface Water 05/19 113,249.5 113,249.5 113,249.5 113,249.5 113,249.5 Total Table 3+Surface Water 06/19 132,549.0 132,549.0 132,549.0 132,549.0 132,549.0 Total PFAS Surface Water 06/19 132,884.1 132,884.1 132,884.1 132,884.1 132,884.1 Total Table 3+Surface Water 02/19 NS NS NS NS NS Total PFAS Surface Water 02/19 NS NS NS NS NS Total Table 3+Surface Water 05/19 2,553.0 2,553.0 2,553.0 2,553.0 2,553.0 Total PFAS Surface Water 05/19 2,585.9 2,585.9 2,585.9 2,585.9 2,585.9 Total Table 3+Surface Water 06/19 2,517.7 2,517.7 2,517.7 2,517.7 2,517.7 Total PFAS Surface Water 06/19 2,547.7 2,547.7 2,547.7 2,547.7 2,547.7 Notes: 2. Supporting calculations for estimating PFAS concentrations for aerial deposition (transport pathway 3), onsite groundwater (transport pathway 5) and offsite groundwater (transport pathway 8) are provided in Appendices C, D and E. 3. Abbreviations: ng/L - nanograms per liter PFAS - Per- and Polyfluoroalkyl substances NS - Samples not collected during corresponding sampling event. 1. Total Table 3+ and Total PFAS computed as sum of analytical results for PFAS compounds listed in Table 1, assuming non-detected samples as zero concentrations. Summary statistics for all PFAS compounds listed in Table 1 and additional supporting data provided in Appendix A. Upstream River and Groundwater Willis Creek Outfall 002 1 2 4 Seep A6A Seep B6B Seep C6C Seep D6D Old Outfall 0027 Georgia Branch Creek9 August 2019 TABLE 4 SUMMARY OF FLOW RATE INPUT VALUES Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Transport Pathway Number7 Potential PFAS Transport Pathway Sampling Event1 1st Quartile Flow (L/s) Median Flow (L/s) 3rd Quartile Flow (L/s) Average Flow (L/s) Geometric Mean Flow (L/s) Surface Water 02/19 138,093 163,837 182,346 170,893 165,672 Surface Water 05/19 33,559 38,348 44,407 39,974 39,267 Surface Water 06/19 26,847 29,472 32,248 29,625 29,488 Surface Water 02/19 183 184 186 184 184 Surface Water 05/19 ok, thanks 184 184 184 184 Surface Water 06/19 184 184 184 184 184 Surface Water 02/19 813 836 871 868 863 Surface Water 05/19 1,052 1,082 1,106 1,082 1,081 Surface Water 06/19 1,151 1,173 1,197 1,175 1,174 Surface Water 02/19 19 21 28 23 23 Surface Water 05/19 20 22 28 25 24 Surface Water 06/19 19 21 28 23 23 Surface Water 02/19 4 4 4 4 4 Surface Water 05/19 3 4 4 3 3 Surface Water 06/19 7 7 7 7 7 Surface Water 02/19 5 6 6 6 6 Surface Water 05/19 5 6 6 6 6 Surface Water 06/19 3 3 3 3 3 Surface Water 02/19 1 1 1 1 1 Surface Water 05/19 1 1 1 1 1 Surface Water 06/19 1 1 1 1 1 Surface Water 02/19 3 3 3 3 3 Surface Water 05/19 3 3 3 3 3 Surface Water 06/19 3 3 3 3 3 Surface Water 02/19 24 27 36 33 31 Surface Water 05/19 21 24 42 30 28 Surface Water 06/19 28 31 32 29 29 Surface Water 02/19 568 724 962 788 761 Surface Water 05/19 568 724 962 788 761 Surface Water 06/19 568 724 962 788 761 Surface Water 02/19 153 154 154 154 154 Surface Water 05/19 153 154 154 154 154 Surface Water 06/19 161 162 165 162 161 Notes: 2. Flow summary statistics not computed where only minimum and maximum flow values reported in Seeps and Creeks Investigation Report (Geosyntec, 2019). 8. Abbreviations: L/s - liter per second NA - not applicable. 7. Supporting calculations for estimating PFAS concentrations for aerial deposition (transport pathway 3), onsite groundwater (transport pathway 5) and offsite groundwater (transport pathway 8) are provided in Appendices C, D and E. 6. Flows at Seep D were not measured in February and May 2019; measurements from June 2019 were used. Outfall 0024 Onsite Groundwater Upstream River and Groundwater31 Willis Creek2 5 Seep A6A Seep B Seep C6C 6B Seep D66D Old Outfall 0027 5. Offsite groundwater estimated from calculated hydraulic gradients based on June 2019 water levels and calculated hydraulic conductivities of LTW wells from slug tests performed in 2019. Supporting calculations provided in Appendix D. Georgia Branch Creek9 Adjacent and Downstream Groundwater8 1. Sampling Event "Surface Water 02/19", "Surface Water 05/19" and "Surface Water 06/19" reported in Seeps and Creeks Investigation Report (Geosyntec, 2019). "Surface Water 02/19" performed February 1 - 7, 2019; "Surface Water 05/19" performed May 20 - 30, 2019; "Surface Water 06/19" performed June 4 - 7, 2019. 3. Upstream river flow computed from measured flow rates from USGS gauging station at W.O. Huske Dam during February, May and June 2019 volumetrically adjusted for inflow/outflow from flow pathways 2 - 9 that occur between River Mile 76 (upstream sampling point) and W.O. Huske Dam. 4. Onsite groundwater estimated from calculated hydraulic gradients based on June 2019 water levels and hydraulic conductivities of Long-Term Wells (LTW) from slug tests performed in 2019. Supporting calculations provided in Appendix C. August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed May-19 Average 14.09 11.85 No changes made. Jun-19 Average 15.86 14.83 Model input parameters: May-19 Geomean 12.55 11.64 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; Jun-19 Geomean 14.56 14.76 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; May-19 Median 12.39 11.37 Groundwater discharge length = 52%; Jun-19 Median 14.60 14.75 Offsite gradient adjustment factor = 0.475. May-19 Q1 9.99 9.96 Jun-19 Q1 12.37 13.45 May-19 Q3 18.06 13.15 Jun-19 Q3 18.83 16.13 May-19 Average 12.71 11.85 Changed groundwater discharge length from 52% to 41%. Jun-19 Average 14.48 14.83 May-19 Geomean 11.39 11.64 Model input parameters: Jun-19 Geomean 13.39 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 11.22 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 13.43 14.75 Groundwater discharge length = 41%; May-19 Q1 9.29 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 11.67 13.45 May-19 Q3 16.16 13.15 Jun-19 Q3 16.93 16.13 May-19 Average 17.10 11.85 Changed groundwater discharge length from 41% to 76%. Jun-19 Average 18.87 14.83 May-19 Geomean 15.09 11.64 Model input parameters: Jun-19 Geomean 17.09 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 14.94 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 17.15 14.75 Groundwater discharge length = 76%; May-19 Q1 11.53 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 13.91 13.45 May-19 Q3 22.21 13.15 Jun-19 Q3 22.97 16.13 May-19 Average 15.47 11.85 Changed groundwater discharge from 76% to 63%. Jun-19 Average 17.24 14.83 May-19 Geomean 13.71 11.64 Model input parameters: Jun-19 Geomean 15.72 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.56 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.77 14.75 Groundwater discharge length = 63%; May-19 Q1 10.70 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 13.07 13.45 May-19 Q3 19.96 13.15 Jun-19 Q3 20.73 16.13 -- Description of changes CommentsScenario 0.59 0.21 0.22 Total Table 3+ Mass Loading (mg/s)NRMSE 0.22 1.33 0 1 Calibration Step Event Date 1.95 0.22 0.31 0.28 0.39 0.74 1.57 0.94 0.902 3 0.33 2.70 1.03 0.52 0.51 0.17 Improved NRMSE for average, maximum, minimum and 3rd quantile - worsened for all other metrics. Overall NRMSE not lowest, continue calibration. Improved NRMSE only for minimum and 1st quartile. Continue calibration. Improved NRMSE for all metrics except minimum and 1st quartile. Continue calibration. Page 1 of 6 August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed Description of changes CommentsScenario Total Table 3+ Mass Loading (mg/s)NRMSECalibration Step Event Date May-19 Average 14.71 11.85 Changed groundwater discharge from 63% to 57%. Jun-19 Average 16.49 14.83 May-19 Geomean 13.08 11.64 Model input parameters: Jun-19 Geomean 15.08 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 12.92 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.13 14.75 Groundwater discharge length = 57%; May-19 Q1 10.31 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.69 13.45 May-19 Q3 18.92 13.15 Jun-19 Q3 19.69 16.13 May-19 Average 15.09 11.85 Changed groundwater discharge from 57% to 60%. Jun-19 Average 16.86 14.83 May-19 Geomean 13.39 11.64 Model input parameters: Jun-19 Geomean 15.40 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.24 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.45 14.75 Groundwater discharge length = 60%; May-19 Q1 10.51 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.88 13.45 May-19 Q3 19.44 13.15 Jun-19 Q3 20.21 16.13 May-19 Average 15.22 11.85 Changed groundwater discharge from 60% to 61%. Jun-19 Average 16.99 14.83 May-19 Geomean 13.50 11.64 Model input parameters: Jun-19 Geomean 15.51 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.35 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.56 14.75 Groundwater discharge length = 61%; May-19 Q1 10.57 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.95 13.45 May-19 Q3 19.61 13.15 Jun-19 Q3 20.38 16.13 May-19 Average 14.96 11.85 Changed groundwater discharge from 61% to 59%. Jun-19 Average 16.74 14.83 May-19 Geomean 13.29 11.64 Model input parameters: Jun-19 Geomean 15.30 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.13 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.35 14.75 Groundwater discharge length = 59%; May-19 Q1 10.44 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.82 13.45 May-19 Q3 19.27 13.15 Jun-19 Q3 20.04 16.13 4 5 6 7 0.79 0.33 0.33 0.45 0.17 1.61 0.45 0.16 1.84 0.87 0.39 0.91 0.42 0.42 0.16 1.78 0.95 0.39 0.16 1.73 Improved NRMSE for all metrics except minimum and 1st quartile. Continue calibration. Worsened NRMSE for all metrics except 1st quartile. 1st quartile model input scenario is the lowest NRMSE for all models thus far. Continue calibration to get overall NRMSE for all metrics lower. Worsened NRMSE for all metrics except minimum and 1st quartile. Continue calibration to get overall NRMSE for all metrics lower. Improved NRMSE as compared to run #5 and run #6. Continue calibration. Page 2 of 6 August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed Description of changes CommentsScenario Total Table 3+ Mass Loading (mg/s)NRMSECalibration Step Event Date May-19 Average 14.84 11.85 Changed groundwater discharge from 59% to 58%. Jun-19 Average 16.61 14.83 May-19 Geomean 13.18 11.64 Model input parameters: Jun-19 Geomean 15.19 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.03 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.24 14.75 Groundwater discharge length = 58%; May-19 Q1 10.38 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.76 13.45 May-19 Q3 19.10 13.15 Jun-19 Q3 19.87 16.13 May-19 Average 14.59 11.85 Changed groundwater discharge from 58% to 56%. Jun-19 Average 16.36 14.83 May-19 Geomean 12.97 11.64 Model input parameters: Jun-19 Geomean 14.98 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 12.82 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.03 14.75 Groundwater discharge length = 56%; May-19 Q1 10.25 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.63 13.45 May-19 Q3 18.75 13.15 Jun-19 Q3 19.52 16.13 May-19 Average 14.34 11.85 Changed groundwater discharge from 56% to 54%. Jun-19 Average 16.11 14.83 May-19 Geomean 12.76 11.64 Model input parameters: Jun-19 Geomean 14.77 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 12.60 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 14.82 14.75 Groundwater discharge length = 54%; May-19 Q1 10.12 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.50 13.45 May-19 Q3 18.41 13.15 Jun-19 Q3 19.17 16.13 May-19 Average 12.44 11.85 Changed groundwater discharge from 54% to 58%. Jun-19 Average 14.21 14.83 May-19 Geomean 11.16 11.64 Model input parameters: Jun-19 Geomean 13.17 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 10.99 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 13.21 14.75 Groundwater discharge length = 58%; May-19 Q1 9.15 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 11.53 13.45 May-19 Q3 15.79 13.15 Jun-19 Q3 16.56 16.13 8 9 10 11 0.16 1.67 0.75 0.31 0.31 0.18 0.83 0.36 0.36 0.20 0.38 0.33 0.42 0.63 1.56 0.67 0.25 0.26 0.19 1.44 Improved NRMSE as compared to run #7. 1st quartile model input scenario is the lowest NRMSE for all models thus far. Worsened NRMSE for all metrics. Continue calibration. Worsened NRMSE for all metrics. Continue calibration. Worsened NRMSE for 1st quartile and median but improved for all other metric compared to run #10. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Page 3 of 6 August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed Description of changes CommentsScenario Total Table 3+ Mass Loading (mg/s)NRMSECalibration Step Event Date May-19 Average 17.24 11.85 Changed Lower Black Creek Aquifer Hydraulic Conductivity from 1. 5 x 10-4 m/s to 2 x 10-4 m/s. Jun-19 Average 19.02 14.83 May-19 Geomean 15.21 11.64 Model input parameters: Jun-19 Geomean 17.21 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 15.06 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 2 x 10-4 m/s; Jun-19 Median 17.27 14.75 Groundwater discharge length = 58%; May-19 Q1 11.60 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 13.98 13.45 May-19 Q3 22.40 13.15 Jun-19 Q3 23.17 16.13 May-19 Average 13.40 11.85 Changed Lower Black Creek Aquifer Hydraulic Conductivity from 2 x 10-4 m/s to 1.2 x 10-4 m/s. Jun-19 Average 15.17 14.83 May-19 Geomean 11.97 11.64 Model input parameters: Jun-19 Geomean 13.98 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 11.81 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.2 x 10-4 m/s; Jun-19 Median 14.02 14.75 Groundwater discharge length = 58%; May-19 Q1 9.64 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.02 13.45 May-19 Q3 17.11 13.15 Jun-19 Q3 17.88 16.13 May-19 Average 15.80 11.85 Changed Lower Black Creek Aquifer Hydraulic Conductivity from 1.2 x 10-4 m/s to 1.7 x 10-4 m/s. Jun-19 Average 17.57 14.83 May-19 Geomean 13.99 11.64 Model input parameters: Jun-19 Geomean 16.00 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.84 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.7 x 10-4 m/s; Jun-19 Median 16.05 14.75 Groundwater discharge length = 58%; May-19 Q1 10.87 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 13.24 13.45 May-19 Q3 20.42 13.15 Jun-19 Q3 21.19 16.13 May-19 Average 15.32 11.85 Changed Lower Black Creek Aquifer Hydraulic Conductivity from 1.7 x 10-4 m/s to 1.6 x 10-4 m/s; Jun-19 Average 17.09 14.83 May-19 Geomean 13.59 11.64 Model input parameters: Jun-19 Geomean 15.59 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 13.44 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.6 x 10-4 m/s; Jun-19 Median 15.65 14.75 Groundwater discharge length = 58%; May-19 Q1 10.62 9.96 Offsite gradient adjustment factor = 0.475 Jun-19 Q1 13.00 13.45 May-19 Q3 19.76 13.15 Jun-19 Q3 20.53 16.13 14 15 12 13 1.62 0.18 0.30 1.03 1.14 0.60 0.58 0.98 0.94 0.35 2.76 0.38 0.19 1.89 0.19 2.10 0.98 0.48 0.47 0.16 Worsened NRSME for all scenarios compared to run #8. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Improved best estimate NRMSE as compared to calibration run #8 for some metrics. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Worsened NRSME for all scenarios compared to run #8. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Worsened NRSME for all scenarios compared to run #8. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Page 4 of 6 August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed Description of changes CommentsScenario Total Table 3+ Mass Loading (mg/s)NRMSECalibration Step Event Date May-19 Average 14.91 11.85 Changed Lower Black Creek Aquifer Hydraulic Conductivity from 1.6 x 10-4 m/s to 1.5 x 10-4 m/s Jun-19 Average 16.69 14.83 and Upper Black Creek Aquifer Hydraulic Conductivity from 1 x 10-6 m/s to 2 x 10-6 m/s. May-19 Geomean 13.24 11.64 Jun-19 Geomean 15.25 14.76 Model input parameters: May-19 Median 13.09 11.37 Upper Black Creek Aquifer Hydraulic Conductivity = 2 x 10-6 m/s; Jun-19 Median 15.30 14.75 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; May-19 Q1 10.41 9.96 Groundwater discharge length = 58%; Jun-19 Q1 12.79 13.45 Offsite gradient adjustment factor = 0.475. May-19 Q3 19.20 13.15 Jun-19 Q3 19.96 16.13 May-19 Average 14.88 11.85 Changed Upper Black Creek Aquifer Hydraulic Conductivity from 2 x 10-6 m/s to 1.5-6 m/s. Jun-19 Average 16.65 14.83 May-19 Geomean 13.21 11.64 Model input parameters: Jun-19 Geomean 15.22 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-6 m/s; May-19 Median 13.06 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.27 14.75 Groundwater discharge length = 58%; May-19 Q1 10.40 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.77 13.45 May-19 Q3 19.15 13.15 Jun-19 Q3 19.91 16.13 May-19 Average 14.80 11.85 Changed Upper Black Creek Aquifer Hydraulic Conductivity from 1.5-6 m/s to 0.5 x 10-6 m/s Jun-19 Average 16.58 14.83 May-19 Geomean 13.15 11.64 Model input parameters: Jun-19 Geomean 15.16 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 0.5 x 10-6 m/s; May-19 Median 13.00 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.21 14.75 Groundwater discharge length = 58%; May-19 Q1 10.36 9.96 Offsite gradient adjustment factor = 0.475 Jun-19 Q1 12.74 13.45 May-19 Q3 19.05 13.15 Jun-19 Q3 19.82 16.13 May-19 Average 14.82 11.85 Changed Upper Black Creek Aquifer Hydraulic Conductivity from 0.5 x 10-6 m/s to 0.8 x 10-6 m/s. Jun-19 Average 16.60 14.83 May-19 Geomean 13.17 11.64 Model input parameters: Jun-19 Geomean 15.18 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 0.8 x 10-6 m/s; May-19 Median 13.02 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.23 14.75 Groundwater discharge length = 58%; May-19 Q1 10.37 9.96 Offsite gradient adjustment factor = 0.475. Jun-19 Q1 12.75 13.45 May-19 Q3 19.08 13.15 Jun-19 Q3 19.85 16.13 16 17 18 19 0.85 0.38 0.38 0.16 1.70 0.35 0.35 0.17 1.65 0.82 0.36 0.84 0.37 0.37 0.16 1.68 0.82 0.36 0.16 1.66 Slightly better NRMSE than run #8 for most scenarios except 1st quartile. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Worsened NRSME for all scenarios compared to run #8. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Worsened NRSME for all scenarios compared to run #8 but not by much. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Slightly better NRMSE than run #8 for most scenarios except 1st quartile. However, model not lowest NRMSE amongst all models tested thus far. Continue calibration. Page 5 of 6 August 2019 TABLE 5 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CALIBRATION Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Model Observed Description of changes CommentsScenario Total Table 3+ Mass Loading (mg/s)NRMSECalibration Step Event Date May-19 Average 14.74 11.85 Changed Upper Black Creek Aquifer Hydraulic Conductivity from 0.8 10-6 m/s to 1 x 10-6 m/s and Jun-19 Average 16.51 14.83 offsite gradient adjustment factor from 0.475 to 0.376. May-19 Geomean 13.14 11.64 Jun-19 Geomean 15.15 14.76 Model input parameters: May-19 Median 12.99 11.37 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; Jun-19 Median 15.20 14.75 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; May-19 Q1 10.36 9.96 Groundwater discharge length = 58%; Jun-19 Q1 12.74 13.45 Offsite gradient adjustment factor = 0.376. May-19 Q3 18.97 13.15 Jun-19 Q3 19.74 16.13 May-19 Average 14.42 11.85 Changed Offsite Surficial Aquifer Hydraulic Conductivity from 2.5 x 10-4 m/s to 1 x 10-6 m/s . Jun-19 Average 16.20 14.83 May-19 Geomean 13.04 11.64 Model input parameters: Jun-19 Geomean 15.04 14.76 Upper Black Creek Aquifer Hydraulic Conductivity = 1 x 10-6 m/s; May-19 Median 12.90 11.37 Lower Black Creek Aquifer Hydraulic Conductivity = 1.5 x 10-4 m/s; Jun-19 Median 15.11 14.75 Groundwater discharge length = 58%; May-19 Q1 10.34 9.96 Offsite gradient adjustment factor = 0.376. Jun-19 Q1 12.72 13.45 May-19 Q3 18.57 13.15 Jun-19 Q3 19.34 16.13 Notes: 2. Total Table 3+ loading percentage computed includes sum of Table 3+ PFAS compounds listed in Table 2 and Hexafluoropropylene oxide dimer acid (HFPO-DA). 3. February-19 moading pecentage not shown here because dataset not complete at the time of this assessment. 4. Normalized Root Mean Square calculated as where, observed refers to observed empirical mass loading at Bladen's Bluff model refers to model-estimated total Table 3+ mass loading in the Cape Fear River at Bladen's Bluff n is the number of field sampling event datasets used in the calibration (May and June 2019) 5. Abbreviations: NRMSE - Normalized Root Mean Square Error RMSE - Root Mean Square Error PFAS - Per- andper- and polyfluoroalkyl substances Q1 - 1st Quartile Q3 - 3rd Quartile 1. February-19, May-19 and June-19 correspond to field sampling events "Surface Water 02/19", "Surface Water 05/19" and "Surface Water 06/19" reported in Seeps and Creeks Investigation Report (Geosyntec, 2019). "Surface Water 02/19" performed February 1 - 7, 2019; "Surface Water 05/19" performed May 20 - 30, 2019; "Surface Water 06/19" performed June 4 - 7, 2019. 20 21 1.50 0.16 1.63 0.69 0.32 0.33 0.17 0.79 0.35 0.35 Improved NRMSE for most metrics as compared to run #19 but model not lowest NRMSE amongst all models tested thus far. Continue calibration. NRMSE did not improve in comparison to run #8. Run #8 1st quartile scenario determined to yield best-fit model 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅=∑𝑖𝑖=1𝑛𝑛=2 𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜−𝑚𝑚𝑜𝑜𝑜𝑜𝑜𝑜𝑚𝑚2𝑛𝑛𝑁𝑁𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅=𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑚𝑚𝑚𝑚𝑚𝑚−𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑚𝑚𝑖𝑖𝑛𝑛 Page 6 of 6 August 2019 TABLE 6 MODEL ESTIMATED TOTAL TABLE 3+ MASS LOADING CONTRIBUTIONS PER PATHWAY Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. May - 20191 (%) June - 20191 (%) 1 Upstream River and Groundwater 4%15% 2 Willis Creek 10%4% 3 Aerial Deposition on River < 2%< 2% 4 Outfall 002 4%7% 5 Onsite Groundwater 22%17% 6A Seep A 9%10% 6B Seep B 16%8% 6C Seep C 2%2% 6D Seep D 5%4% 7 Old Outfall 002 23%29% 8 Adjacent and Downstream Groundwater < 2%< 2% 9 Georgia Branch Creek 4%3% 100%100% 32%24% 55%53% Notes: 4. Abbreviations: NA - Not Applicable. Total Total Seeps Transport Pathway Number Potential PFAS Transport Pathway Total Table 3+ Estimated Loading Percentage2 1. May-2019 and June-2019 correspond to field sampling events "Surface Water 02/19", "Surface Water 05/19" and "Surface Water 06/19" reported in Seeps and Creeks Investigation Report (Geosyntec, 2019). "Surface Water 3. February-19 moading pecentage not shown here because dataset not complete at the time of this assessment. Total Seeps, Old Outfall 002 2. Total Table 3+ loading percentage computed includes Table 3+ listed in Table 2 and Hexafluoropropylene oxide dimer acid (HFPO-DA). Page 1 of 1 August 2019 TABLE 7-A OBSERVED CONCENTRATIONS AND MASS LOADINGS AT BLADEN BLUFFS - MAY 2019 AND JUNE 2019 Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C Measured Concentration at Bladen Bluffs Observed Mass Loading at Bladen Bluffs Measured Concentration Observed Mass Loading at Bladen Bluffs ng/L ng/s ng/L ng/s HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 28 1,443,027 57 1,856,169 PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 ND ND ND ND PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 ND ND ND ND PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 130 6,699,766 180 5,861,587 PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 40 2,061,466 64 2,084,120 PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 9.9 510,213 16 521,030 PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 3.5 180,378 6 208,412 PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 31 1,597,636 55 1,791,041 Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 ND ND ND ND EVE Acid Perfluoroethoxypropionic acid 69087-46-3 ND ND ND ND PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 ND ND ND ND R-EVE R-EVE EVS1428 4 206,147 6 205,156 PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 ND ND 3 110,719 Byproduct 4 Byproduct 4 EVS1429 9.6 494,752 19 618,723 Byproduct 5 Byproduct 5 EVS1430 31 1,597,636 69 2,246,942 Byproduct 6 Byproduct 6 EVS1431 ND ND ND ND NVHOS Perfluoroethoxysulfonic acid 1132933-86-8 6.1 314,374 9 283,310 PES Perfluoroethoxyethanesulfonic acid 113507-82-7 ND ND ND ND PFESA-BP1 Byproduct 1 29311-67-9 ND ND 2 78,154 PFESA-BP2 Byproduct 2 749836-20-2 ND ND 5 159,565 PFBA Perfluorobutanoic acid 375-22-4 6.8 350,449 9 276,797 PFDA Perfluorodecanoic acid 335-76-2 ND ND ND ND PFDoA Perfluorododecanoic acid 307-55-1 ND ND ND ND PFHpA Perfluoroheptanoic acid 375-85-9 8.2 422,601 10 325,644 PFNA Perfluorononanoic acid 375-95-1 ND ND ND ND PFOA Perfluorooctanoic acid 335-67-1 6.8 350,449 9 283,310 PFHxA Perfluorohexanoic acid 307-24-4 12 618,440 17 553,594 PFPeA Perfluoropentanoic acid 2706-90-3 13 669,977 20 651,287 PFTeA Perfluorotetradecanoic acid 376-06-7 ND ND ND ND PFTriA Perfluorotridecanoic acid 72629-94-8 ND ND ND ND PFUnA Perfluoroundecanoic acid 2058-94-8 ND ND ND ND PFBS Perfluorobutanesulfonic acid 375-73-5 3.3 170,071 4 140,027 PFDS Perfluorodecanesulfonic acid 335-77-3 ND ND ND ND PFHpS Perfluoroheptanesulfonic acid 375-92-8 ND ND ND ND PFHxS Perfluorohexanesulfonic acid 355-46-4 5 257,683 7 218,181 PFNS Perfluorononanesulfonic acid 68259-12-1 ND ND ND ND PFOS Perfluorooctanesulfonic acid 1763-23-1 13 669,977 15 488,466 PFPeS Perfluoropentanesulfonic acid 2706-91-4 ND ND ND ND 10:2 FTS 10:2-fluorotelomersulfonic acid 120226-60-0 ND ND ND ND 4:2 FTS 4:2 fluorotelomersulfonic acid 757124-72-4 ND ND ND ND 6:2 FTS 6:2 fluorotelomersulfonic acid 27619-97-2 ND ND ND ND 8:2 FTS 8:2 fluorotelomersulfonic acid 39108-34-4 ND ND ND ND NEtFOSAA NEtFOSAA 2991-50-6 ND ND ND ND NEtPFOSA NEtPFOSA 4151-50-2 NS NS NS NS NEtPFOSAE NEtPFOSAE 1691-99-2 NS NS NS NS NMeFOSAA NMeFOSAA 2355-31-9 ND ND ND ND NMePFOSA NMePFOSA 31506-32-8 NS NS NS NS NMePFOSAE NMePFOSAE 24448-09-7 NS NS NS NS PFDOS Perfluorododecanesulfonic acid 79780-39-5 ND ND ND ND PFHxDA Perfluorohexadecanoic acid 67905-19-5 NS NS NS NS PFODA Perfluorooctadecanoic acid 16517-11-6 ND ND ND ND PFOSA Perfluorooctanesulfonamide 754-91-6 ND ND ND ND F-53B Major F-53B Major 73606-19-6 NS NS NS NS F-53B Minor F-53B Minor 83329-89-9 NS NS NS NS ADONA 4,8-dioxa-3H-perfluorononanoate 958445-44-8 NS NS NS NS NaDONA NaDONA EVS1361 NS NS NS NS DONA DONA 919005-14-4 NS NS NS NS Notes: 2. Abbreviations: ng/L - nanograms per liter ng/s - nanograms per second ND - Compound was not detected at laboratory detection limit. NS - Compound was analyzed for in collected sample(s) or sample was not collected. 1. To account for 1 day of travel time, the mass loading was calculated using the average flow rate at USGS Station No. 02105500 one day prior to the date of sampling at the Bladen Bluffs intake. The Bladen Bluffs intake was sampled on May 22, 2019 and June 7, 2019 for the May and June sampling events, respectively. The average flow rate measured one day prior was 1,820 cubic feet per second (May 21, 2019) and 1,150 cubic feet per second (June 6, 2019) for the May and June sampling events, respectively. Table 3+ Lab SOP EPA Method 537 Mod May 2019 Sampling Event June 2019 Sampling Event Analytical Method Common Name Chemical Name CASN August 2019 TABLE 7-B OBSERVED CONCENTRATIONS AND MASS LOADINGS AT KINGS BLUFF - MAY 2019 AND JUNE 2019 Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C Measured Concentration at Bladen Bluffs Observed Mass Loading at Bladen Bluffs Measured Concentration Observed Mass Loading at Bladen Bluffs ng/L ng/s ng/L ng/s HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 17 897,078 37 1,424,904 PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 ND ND ND ND PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 ND ND ND ND PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 8 440,384 230 8,857,510 PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 29 1,576,682 66 2,541,720 PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 8 410,481 20 770,218 PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 2 130,484 8.2 315,789 PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 25 1,359,209 35 1,347,882 Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 ND ND ND ND EVE Acid Perfluoroethoxypropionic acid 69087-46-3 ND ND ND ND PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 ND ND ND ND R-EVE R-EVE EVS1428 10 543,683 8.3 319,641 PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 ND ND 3.2 123,235 Byproduct 4 Byproduct 4 EVS1429 20 1,087,367 19 731,707 Byproduct 5 Byproduct 5 EVS1430 8 432,228 82 3,157,895 Byproduct 6 Byproduct 6 EVS1431 ND ND ND ND NVHOS Perfluoroethoxysulfonic acid 1132933-86-8 6.2 337,084 9 346,598 PES Perfluoroethoxyethanesulfonic acid 113507-82-7 ND ND ND ND PFESA-BP1 Byproduct 1 29311-67-9 ND ND ND ND PFESA-BP2 Byproduct 2 749836-20-2 ND ND 5 192,555 PFBA Perfluorobutanoic acid 375-22-4 4.9 266,405 7.3 281,130 PFDA Perfluorodecanoic acid 335-76-2 ND ND ND ND PFDoA Perfluorododecanoic acid 307-55-1 ND ND ND ND PFHpA Perfluoroheptanoic acid 375-85-9 6.0 326,210 9.6 369,705 PFNA Perfluorononanoic acid 375-95-1 ND ND ND ND PFOA Perfluorooctanoic acid 335-67-1 6.7 364,268 7.1 273,427 PFHxA Perfluorohexanoic acid 307-24-4 8.95 486,597 15 577,664 PFPeA Perfluoropentanoic acid 2706-90-3 9.65 524,655 16 616,175 PFTeA Perfluorotetradecanoic acid 376-06-7 ND ND ND ND PFTriA Perfluorotridecanoic acid 72629-94-8 ND ND ND ND PFUnA Perfluoroundecanoic acid 2058-94-8 ND ND ND ND PFBS Perfluorobutanesulfonic acid 375-73-5 2.8 152,231 3.3 127,086 PFDS Perfluorodecanesulfonic acid 335-77-3 ND ND ND ND PFHpS Perfluoroheptanesulfonic acid 375-92-8 ND ND ND ND PFHxS Perfluorohexanesulfonic acid 355-46-4 4.3 231,065 5.5 211,810 PFNS Perfluorononanesulfonic acid 68259-12-1 ND ND ND ND PFOS Perfluorooctanesulfonic acid 1763-23-1 12 652,420 14 539,153 PFPeS Perfluoropentanesulfonic acid 2706-91-4 ND ND ND ND 10:2 FTS 10:2-fluorotelomersulfonic acid 120226-60-0 ND ND ND ND 4:2 FTS 4:2 fluorotelomersulfonic acid 757124-72-4 ND ND ND ND 6:2 FTS 6:2 fluorotelomersulfonic acid 27619-97-2 ND ND ND ND 8:2 FTS 8:2 fluorotelomersulfonic acid 39108-34-4 ND ND ND ND NEtFOSAA NEtFOSAA 2991-50-6 ND ND ND ND NEtPFOSA NEtPFOSA 4151-50-2 NS NS NS NS NEtPFOSAE NEtPFOSAE 1691-99-2 NS NS NS NS NMeFOSAA NMeFOSAA 2355-31-9 ND ND ND ND NMePFOSA NMePFOSA 31506-32-8 NS NS NS NS NMePFOSAE NMePFOSAE 24448-09-7 NS NS NS NS PFDOS Perfluorododecanesulfonic acid 79780-39-5 ND ND ND ND PFHxDA Perfluorohexadecanoic acid 67905-19-5 NS NS NS NS PFODA Perfluorooctadecanoic acid 16517-11-6 ND ND ND ND PFOSA Perfluorooctanesulfonamide 754-91-6 ND ND ND ND F-53B Major F-53B Major 73606-19-6 NS NS NS NS F-53B Minor F-53B Minor 83329-89-9 NS NS NS NS ADONA 4,8-dioxa-3H-perfluorononanoate 958445-44-8 NS NS NS NS NaDONA NaDONA EVS1361 NS NS NS NS DONA DONA 919005-14-4 NS NS NS NS Notes: 3. Abbreviations: ng/L - nanograms per liter ng/s - nanograms per second ND - Compound was not detected at laboratory detection limit. NS - Compound was analyzed for in collected sample(s) or sample was not collected. Table 3+ Lab SOP EPA Method 537 Mod 1.Mass loading was calculated using the average flow rate at USGS Station No. 02105769 on the date of sampling at the Kings Bluff intake. The Kings Bluff intake was sampled on May 22, 2019 and June 7, 2019 for the May and June sampling events, respectively. The average flow rates measured on those dates were 1,920 cubic feet per second (May 21, 2019) and 1,360 cubic feet per second (June 6, 2019) for the May and June sampling events, respectively. 2. A duplicate sample was analyzed at Kings Bluff for the May Sampling event. When an analyte was detected in both the primary sample and the duplicate sample, the average of the two values was used. Otherwise, the value from the primary sample was used. Analytical Method Common Name Chemical Name CASN May 2019 Sampling Event June 2019 Sampling Event August 2019 TABLE 8-AESTIMATED PATHWAY CONTRIBUTION TO OBSERVED CONCENTRATION AT BLADEN BLUFFS - MAY 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, P.C123456A6B6C6D789Observed Concentration at Bladen BluffsUpstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch Creekng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/L%%%HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 28.00.05.00.00.45.82.84.10.81.54.80.22.628.028.000100%0%0%PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 130.00.06.80.03.833.59.422.93.37.742.50.10.0130.0130.000100%0%0%PFO2HxAPerfluoro(3,5-dioxahexanoic) acid 39492-88-1 40.02.54.10.01.910.83.35.00.91.98.20.11.440.040.000100%0%0%PFO3OAPerfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 9.90.00.80.00.92.61.31.20.30.52.30.00.09.99.900100%0%0%PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 3.50.00.90.00.60.00.80.20.10.20.80.00.03.53.500100%0%0%PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 310.07.30.10.07.02.14.90.20.73.20.35.331.031.000100%0%0%Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---EVE AcidPerfluoroethoxypropionic acid69087-46-3 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFECA BPerfluoro-3,6-dioxaheptanoic acid 151772-58-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---R-EVER-EVEEVS1428 4.00.00.00.00.10.00.81.80.10.50.60.00.04.04.000100%0%0%PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -Byproduct 4Byproduct 4EVS1429 9.60.00.00.00.80.02.23.60.20.72.00.00.09.69.600100%0%0%Byproduct 5Byproduct 5EVS1430 31.011.72.70.00.30.06.97.70.10.51.10.00.031.029.30295%0%5%Byproduct 6Byproduct 6EVS1431 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND-- -NVHOSPerfluoroethoxysulfonic acid 1132933-86-8 6.14.30.00.00.50.00.10.50.00.10.60.00.06.11.80429%0%71%PESPerfluoroethoxyethanesulfonic acid 113507-82-7 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFESA-BP1Byproduct 129311-67-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND- - -PFESA-BP2Byproduct 2749836-20-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---293.118.527.60.29.259.729.951.76.014.366.20.79.2293.1287.10698%0%2%PFBAPerfluorobutanoic acid375-22-4 6.86.40.10.00.00.10.00.10.00.00.10.00.16.80.36.50.04%96%0%PFDAPerfluorodecanoic acid335-76-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFDoAPerfluorododecanoic acid307-55-1 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHpAPerfluoroheptanoic acid375-85-9 8.28.10.00.00.00.00.00.00.00.00.00.00.08.20.08.20.01%99%0%PFNAPerfluorononanoic acid375-95-1 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFOAPerfluorooctanoic acid335-67-1 6.86.70.00.00.00.00.00.00.00.00.00.00.06.80.06.80.00%100%0%PFHxAPerfluorohexanoic acid307-24-4 12.011.90.00.00.00.00.00.00.00.00.00.00.012.00.012.00.00%100%0%PFPeAPerfluoropentanoic acid2706-90-3 13.012.10.10.00.00.30.10.20.00.10.10.00.013.00.712.30.06%94%0%PFTeAPerfluorotetradecanoic acid376-06-7 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFTriAPerfluorotridecanoic acid72629-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFUnAPerfluoroundecanoic acid2058-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFBSPerfluorobutanesulfonic acid375-73-5 3.33.30.00.00.00.00.00.00.00.00.00.00.03.30.03.30.00%100%0%PFDSPerfluorodecanesulfonic acid335-77-3 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFHpSPerfluoroheptanesulfonic acid375-92-8 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFHxSPerfluorohexanesulfonic acid355-46-4 5.05.00.00.00.00.00.00.00.00.00.00.00.05.00.05.00.00%100%0%PFNSPerfluorononanesulfonic acid68259-12-1 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFOSPerfluorooctanesulfonic acid1763-23-1 13.013.00.00.00.00.00.00.00.00.00.00.00.013.00.013.00.00%100%0%PFPeSPerfluoropentanesulfonic acid2706-91-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -4:2 FTS4:2 fluorotelomersulfonic acid 757124-72-4 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtFOSAANEtFOSAA2991-50-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtPFOSANEtPFOSA4151-50-2 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NEtPFOSAENEtPFOSAE1691-99-2 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMeFOSAANMeFOSAA2355-31-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NMePFOSANMePFOSA31506-32-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMePFOSAENMePFOSAE24448-09-7 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---PFDOSPerfluorododecanesulfonic acid 79780-39-5 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHxDAPerfluorohexadecanoic acid67905-19-5 NSNSNSNSNSNSNSNSNSNSNSNSNSNS NS NS NS - - -PFODAPerfluorooctadecanoic acid16517-11-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFOSAPerfluorooctanesulfonamide754-91-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---F-53B MajorF-53B Major73606-19-6 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS-- -F-53B MinorF-53B Minor83329-89-9 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS - - -ADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NaDONANaDONAEVS1361 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---DONADONA919005-14-4 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---68.166.50.30.00.00.40.10.30.00.10.20.00.268.11.167.00.02%98%0%361.285.027.80.29.260.130.052.06.014.466.40.79.4361.2288.267.06.080%19%2%Notes:1. Estimated percentage contribution of pathway to total mass loading based on 1st Quartile Input Values for May 2019 event; see Table 10-A.2. Percentage of pathway contribution allocated to Site, Other, or Unknown sources per pathway per compound presented in Table 11.3. Abbreviations:ng/L - nanograms per literng/s - nanograms per secondND - Compound was not detected at laboratory detection limit.NS - Compound was analyzed for in collected sample(s) or sample was not collected.Total PFAS Mass LoadingEPA Method 537 ModTotal Table 3+Table 3+ Lab SOPTotal PFAS ConcentrationTotal EPA Method 537Analytical Method Common Name Chemical NameCASNTransport Pathway Number →Percentage of Concentration of PFAS Originating from FacilityPercentage of Total Concentration of PFAS from Other SourcesPercentage of Total Concentration of PFAS from Unknown SourcesTotal Concentration of PFAS Originating from FacilityTotal Concentration of PFAS from Other SourcesTotal Concentration of PFAS from Unknown SourcesAugust 2019 TABLE 8-BESTIMATED PATHWAY CONTRIBUTION TO OBSERVED CONCENTRATION AT BLADEN BLUFFS - JUNE 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC, P.C.123456A6B6C6D789Observed Mass Loading at Bladen BluffsUpstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch Creekng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/L%%%HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 57.010.23.20.12.68.97.44.61.92.79.70.35.457.057.000100%0%0%PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 180.00.04.90.06.836.915.915.85.38.984.60.10.7180.0180.000100%0%0%PFO2HxAPerfluoro(3,5-dioxahexanoic) acid39492-88-1 64.04.22.70.14.316.87.14.21.62.518.00.22.364.064.000100%0%0%PFO3OAPerfluoro(3,5,7-trioxaoctanoic) acid39492-89-2 16.00.00.40.02.13.72.60.90.50.84.60.00.316.016.000100%0%0%PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 6.40.00.10.02.30.01.50.20.10.21.70.00.16.46.400100%0%0%PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 55.018.93.90.10.39.74.54.20.40.86.00.45.755.055.000100%0%0%Hydro-EVE Acid Perfluoroethoxsypropanoic acid773804-62-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---EVE AcidPerfluoroethoxypropionic acid69087-46-3 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFECA BPerfluoro-3,6-dioxaheptanoic acid151772-58-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---R-EVER-EVEEVS14286.33.70.40.00.10.00.50.70.10.20.40.00.36.36.300100%0%0%PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 3.40.00.00.01.80.01.00.00.00.00.50.00.03.43.400100%0%0%Byproduct 4Byproduct 4EVS1429 19.013.90.50.01.60.00.70.80.10.20.70.00.519.015.50482%0%18%Byproduct 5Byproduct 5EVS1430 69.042.73.40.04.60.08.37.20.20.52.20.00.069.063.00691%0%9%Byproduct 6Byproduct 6EVS1431NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NVHOSPerfluoroethoxysulfonic acid1132933-86-8 8.76.00.10.01.20.00.20.30.10.10.80.00.08.72.70631%0%69%PESPerfluoroethoxyethanesulfonic acid113507-82-7 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFESA-BP1Byproduct 129311-67-9 2.40.00.00.01.10.00.80.20.00.00.20.00.02.42.400100%0%0%PFESA-BP2Byproduct 2749836-20-2 4.90.00.10.04.10.00.20.10.00.00.20.00.14.94.900100%0%0%492.1 99.619.80.333.076.050.839.310.316.9129.61.115.5492.1476.601697%0%3%PFBAPerfluorobutanoic acid375-22-48.58.00.10.00.00.10.10.10.00.00.10.00.18.50.38.20.04%96%0%PFDAPerfluorodecanoic acid335-76-2NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFDoAPerfluorododecanoic acid307-55-1NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHpAPerfluoroheptanoic acid375-85-910.09.90.00.00.00.00.00.00.00.00.00.00.010.00.19.90.01%99%0%PFNAPerfluorononanoic acid375-95-1NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFOAPerfluorooctanoic acid335-67-18.78.60.00.00.00.00.00.00.00.00.00.00.08.70.08.70.00%100%0%PFHxAPerfluorohexanoic acid307-24-417.016.90.00.00.00.00.00.00.00.00.00.00.017.00.017.00.00%100%0%PFPeAPerfluoropentanoic acid2706-90-3 20.019.00.10.00.00.30.10.20.00.10.20.00.120.00.819.10.04%96%0%PFTeAPerfluorotetradecanoic acid376-06-7NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFTriAPerfluorotridecanoic acid72629-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFUnAPerfluoroundecanoic acid2058-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFBSPerfluorobutanesulfonic acid375-73-54.34.30.00.00.00.00.00.00.00.00.00.00.04.30.04.30.00%100%0%PFDSPerfluorodecanesulfonic acid335-77-3NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFHpSPerfluoroheptanesulfonic acid375-92-8NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFHxSPerfluorohexanesulfonic acid355-46-46.76.70.00.00.00.00.00.00.00.00.00.00.06.70.06.70.00%100%0%PFNSPerfluorononanesulfonic acid68259-12-1 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFOSPerfluorooctanesulfonic acid1763-23-1 15.015.00.00.00.00.00.00.00.00.00.00.00.015.00.015.00.00%100%0%PFPeSPerfluoropentanesulfonic acid2706-91-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---10:2 FTS10:2-fluorotelomersulfonic acid120226-60-0 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -4:2 FTS4:2 fluorotelomersulfonic acid757124-72-4 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtFOSAANEtFOSAA2991-50-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtPFOSANEtPFOSA4151-50-2NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NEtPFOSAENEtPFOSAE1691-99-2NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMeFOSAANMeFOSAA2355-31-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NMePFOSANMePFOSA31506-32-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMePFOSAENMePFOSAE24448-09-7 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---PFDOSPerfluorododecanesulfonic acid79780-39-5 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHxDAPerfluorohexadecanoic acid67905-19-5 NSNSNSNSNSNSNSNSNSNSNSNSNSNS NS NS NS - - -PFODAPerfluorooctadecanoic acid16517-11-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFOSAPerfluorooctanesulfonamide754-91-6NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---F-53B MajorF-53B Major73606-19-6 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---F-53B MinorF-53B Minor83329-89-9 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS - --ADONA4,8-dioxa-3H-perfluorononanoate958445-44-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NaDONANaDONAEVS1361NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---DONADONA919005-14-4 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---90.288.30.30.00.00.40.20.30.10.10.30.00.290.21.288.90.01%99%0%582.3 187.920.00.333.076.451.039.510.417.0129.91.115.7582.3477.888.915.582%15%3%Notes:1. Estimated percentage contribution of pathway to total mass loading based on 1st Quartile Input Values for May 2019 event; see Table 10-B.2. Percentage of pathway contribution allocated to Site, Other, or Unknown sources per pathway per compound presented in Table 11.3. Abbreviations:ng/L - nanograms per literng/s - nanograms per secondND - Compound was not detected at laboratory detection limit.NS - Compound was analyzed for in collected sample(s) or sample was not collected.Total PFAS Mass LoadingPercentage of Concentration of PFAS Originating from FacilityTransport Pathway Number →Total PFAS ConcentrationTotal Concentration of PFAS Originating from FacilityTotal Concentration of PFAS from Other SourcesTotal Concentration of PFAS from Unknown SourcesAnalytical MethodCommon Name Chemical NameCASNPercentage of Total Concentration of PFAS from Other SourcesPercentage of Total Concentration of PFAS from Unknown SourcesTable 3+ Lab SOPTotal Table 3+EPA Method 537 ModTotal EPA Method 537August 2019 TABLE 8-CESTIMATED PATHWAY CONTRIBUTION TO OBSERVED CONCENTRATION AT KINGS BLUFF - MAY 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC, P.C.123456A6B6C6D789Observed Concentration at Kings Bluff*Upstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch Creekng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/L%%%HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 16.50.03.00.00.23.41.72.40.40.92.90.11.516.516.500100%0%0%PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 8.10.00.40.00.22.10.61.40.20.52.70.00.08.18.100100%0%0%PFO2HxAPerfluoro(3,5-dioxahexanoic) acid 39492-88-1 29.01.83.00.01.47.82.43.60.61.35.90.11.029.029.000100%0%0%PFO3OAPerfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 7.60.00.60.00.72.01.00.90.20.41.80.00.07.67.600100%0%0%PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 2.40.00.60.00.40.00.60.10.00.10.60.00.02.42.400100%0%0%PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 25.00.05.90.10.05.61.74.00.20.62.60.24.225.025.000100%0%0%Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---EVE AcidPerfluoroethoxypropionic acid69087-46-3 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFECA BPerfluoro-3,6-dioxaheptanoic acid 151772-58-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---R-EVER-EVEEVS1428 10.00.00.00.00.30.02.14.40.31.31.50.00.010.010.000100%0%0%PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -Byproduct 4Byproduct 4EVS1429 20.00.00.00.01.70.04.77.60.41.44.20.00.020.020.000100%0%0%Byproduct 5Byproduct 5EVS1430 8.03.00.70.00.10.01.82.00.00.10.30.00.08.07.50095%0%5%Byproduct 6Byproduct 6EVS1431 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NVHOSPerfluoroethoxysulfonic acid 1132933-86-8 6.24.40.00.00.50.00.10.50.00.10.60.00.06.21.80429%0%71%PESPerfluoroethoxyethanesulfonic acid 113507-82-7 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFESA-BP1Byproduct 129311-67-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND- - -PFESA-BP2Byproduct 2749836-20-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---132.79.214.10.15.520.916.626.92.56.822.90.56.8132.7127.90.04.896%0%4%PFBAPerfluorobutanoic acid375-22-4 4.94.60.00.00.00.10.00.10.00.00.00.00.04.90.24.70.04%96%0%PFDAPerfluorodecanoic acid335-76-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFDoAPerfluorododecanoic acid307-55-1 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHpAPerfluoroheptanoic acid375-85-9 6.05.90.00.00.00.00.00.00.00.00.00.00.06.00.06.00.01%99%0%PFNAPerfluorononanoic acid375-95-1 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND - - -PFOAPerfluorooctanoic acid335-67-1 6.76.60.00.00.00.00.00.00.00.00.00.00.06.70.06.70.00%100%0%PFHxAPerfluorohexanoic acid307-24-4 9.08.90.00.00.00.00.00.00.00.00.00.00.09.00.08.90.00%100%0%PFPeAPerfluoropentanoic acid2706-90-3 9.79.00.00.00.00.20.10.10.00.00.10.00.09.60.59.10.06%94%0%PFTeAPerfluorotetradecanoic acid376-06-7 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFTriAPerfluorotridecanoic acid72629-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFUnAPerfluoroundecanoic acid2058-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFBSPerfluorobutanesulfonic acid375-73-5 2.82.80.00.00.00.00.00.00.00.00.00.00.02.80.02.80.00%100%0%PFDSPerfluorodecanesulfonic acid335-77-3 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFHpSPerfluoroheptanesulfonic acid375-92-8 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFHxSPerfluorohexanesulfonic acid355-46-4 4.34.20.00.00.00.00.00.00.00.00.00.00.04.20.04.20.00%100%0%PFNSPerfluorononanesulfonic acid68259-12-1 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFOSPerfluorooctanesulfonic acid1763-23-1 12.012.00.00.00.00.00.00.00.00.00.00.00.012.00.012.00.00%100%0%PFPeSPerfluoropentanesulfonic acid2706-91-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -4:2 FTS4:2 fluorotelomersulfonic acid 757124-72-4 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtFOSAANEtFOSAA2991-50-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtPFOSANEtPFOSA4151-50-2 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NEtPFOSAENEtPFOSAE1691-99-2 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMeFOSAANMeFOSAA2355-31-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NMePFOSANMePFOSA31506-32-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMePFOSAENMePFOSAE24448-09-7 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---PFDOSPerfluorododecanesulfonic acid 79780-39-5 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHxDAPerfluorohexadecanoic acid67905-19-5 NSNSNSNSNSNSNSNSNSNSNSNSNS NS NS NS NS - - -PFODAPerfluorooctadecanoic acid16517-11-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFOSAPerfluorooctanesulfonamide754-91-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---F-53B MajorF-53B Major73606-19-6 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS-- -F-53B MinorF-53B Minor83329-89-9 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS - - -ADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NaDONANaDONAEVS1361 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---DONADONA919005-14-4 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---55.354.00.20.00.00.30.10.20.00.10.20.00.155.20.854.50.01%99%0%188.063.314.30.15.521.216.727.12.56.923.00.56.9187.9128.754.54.868%29%3%Notes:* Observed concentration at Kings Bluff is the sum of the average of each reported PFAS compound value from the parent and duplicate samples collected on May 23, 2019.1. Estimated percentage contribution of pathway to total mass loading based on 1st Quartile Input Values for May 2019 event; see Table 10-A.2. Percentage of pathway contribution allocated to Site, Other, or Unknown sources per pathway per compound presented in Table 11.3. Abbreviations:ng/L - nanograms per literng/s - nanograms per secondND - Compound was not detected at laboratory detection limit.NS - Compound was analyzed for in collected sample(s) or sample was not collected.Table 3+ Lab SOPTotal Table 3+EPA Method 537 ModTotal EPA Method 537Total PFAS Mass LoadingPercentage of Total Concentration of PFAS from Other SourcesPercentage of Total Concentration of PFAS from Unknown SourcesAnalytical Method Common Name Chemical NameCASNTransport Pathway Number →Total PFAS ConcentrationTotal Concentration of PFAS Originating from FacilityTotal Concentration of PFAS from Other SourcesTotal Concentration of PFAS from Unknown SourcesPercentage of Concentration of PFAS Originating from FacilityAugust 2019 TABLE 8-DESTIMATED PATHWAY CONTRIBUTION TO OBSERVED CONCENTRATION AT KINGS BLUFF - JUNE 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC, P.C.123456A6B6C6D789Observed Mass Loading at Kings BluffUpstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch Creekng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/Lng/L%%%HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 37.06.62.10.01.75.84.83.01.21.76.30.23.537.037.00.00.0100%0%0%PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 230.00.06.20.08.747.120.320.26.811.4108.10.10.9230.0230.00.00.0100%0%0%PFO2HxAPerfluoro(3,5-dioxahexanoic) acid39492-88-1 66.04.32.80.14.517.37.34.41.72.618.50.32.366.066.00.00.0100%0%0%PFO3OAPerfluoro(3,5,7-trioxaoctanoic) acid39492-89-2 20.00.00.50.02.64.63.21.20.61.05.80.00.420.020.00.00.0100%0%0%PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 8.20.00.20.03.00.02.00.30.20.32.20.00.28.28.20.00.0100%0%0%PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 35.012.12.50.10.26.22.82.70.30.53.80.33.635.035.00.00.0100%0%0%Hydro-EVE Acid Perfluoroethoxsypropanoic acid773804-62-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---EVE AcidPerfluoroethoxypropionic acid69087-46-3 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFECA BPerfluoro-3,6-dioxaheptanoic acid151772-58-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---R-EVER-EVEEVS14288.34.90.50.00.10.00.70.90.10.30.50.00.48.38.30.00.0100%0%0%PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 3.20.00.00.01.70.00.90.00.00.00.50.00.03.23.20.00.0100%0%0%Byproduct 4Byproduct 4EVS1429 19.013.90.50.01.60.00.70.80.10.20.70.00.519.015.50.03.582%0%18%Byproduct 5Byproduct 5EVS1430 82.050.74.10.05.40.09.98.60.20.52.60.00.082.074.80.07.291%0%9%Byproduct 6Byproduct 6EVS1431NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NVHOSPerfluoroethoxysulfonic acid1132933-86-8 9.06.20.10.01.20.00.20.30.10.10.80.00.09.02.80.06.231%0%69%PESPerfluoroethoxyethanesulfonic acid113507-82-7 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFESA-BP1Byproduct 129311-67-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFESA-BP2Byproduct 2749836-20-2 5.00.00.10.04.20.00.20.10.00.00.30.00.15.05.00.00.0100%0%0%522.7 98.619.50.235.081.053.142.311.218.6150.10.912.0522.7505.80.016.997%0%3%PFBAPerfluorobutanoic acid375-22-47.36.90.00.00.00.10.00.10.00.00.10.00.17.30.37.00.04%96%0%PFDAPerfluorodecanoic acid335-76-2NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND ---PFDoAPerfluorododecanoic acid307-55-1NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHpAPerfluoroheptanoic acid375-85-99.69.50.00.00.00.00.00.00.00.00.00.00.09.60.09.60.01%99%0%PFNAPerfluorononanoic acid375-95-1NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND ---PFOAPerfluorooctanoic acid335-67-17.17.00.00.00.00.00.00.00.00.00.00.00.07.10.07.10.00%100%0%PFHxAPerfluorohexanoic acid307-24-415.014.90.00.00.00.00.00.00.00.00.00.00.015.00.015.00.00%100%0%PFPeAPerfluoropentanoic acid2706-90-3 16.015.20.10.00.00.30.10.10.00.10.10.00.016.00.715.30.04%96%0%PFTeAPerfluorotetradecanoic acid376-06-7NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFTriAPerfluorotridecanoic acid72629-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFUnAPerfluoroundecanoic acid2058-94-8 NDNDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND - - -PFBSPerfluorobutanesulfonic acid375-73-53.33.30.00.00.00.00.00.00.00.00.00.00.03.30.03.30.00%100%0%PFDSPerfluorodecanesulfonic acid335-77-3NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFHpSPerfluoroheptanesulfonic acid375-92-8NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFHxSPerfluorohexanesulfonic acid355-46-45.55.50.00.00.00.00.00.00.00.00.00.00.05.50.05.50.00%100%0%PFNSPerfluorononanesulfonic acid68259-12-1 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -PFOSPerfluorooctanesulfonic acid1763-23-1 14.014.00.00.00.00.00.00.00.00.00.00.00.014.00.014.00.00%100%0%PFPeSPerfluoropentanesulfonic acid2706-91-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---10:2 FTS10:2-fluorotelomersulfonic acid120226-60-0 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -4:2 FTS4:2 fluorotelomersulfonic acid757124-72-4 NDNDNDNDNDNDNDNDNDNDNDNDND ND ND ND ND - - -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtFOSAANEtFOSAA2991-50-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NEtPFOSANEtPFOSA4151-50-2NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NEtPFOSAENEtPFOSAE1691-99-2NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMeFOSAANMeFOSAA2355-31-9 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---NMePFOSANMePFOSA31506-32-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NMePFOSAENMePFOSAE24448-09-7 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---PFDOSPerfluorododecanesulfonic acid79780-39-5 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFHxDAPerfluorohexadecanoic acid67905-19-5 NSNSNSNSNSNSNSNSNSNSNSNSNS NS NS NS NS - - -PFODAPerfluorooctadecanoic acid16517-11-6 NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---PFOSAPerfluorooctanesulfonamide754-91-6NDNDNDNDNDNDNDNDNDNDNDNDNDNDNDNDND---F-53B MajorF-53B Major73606-19-6 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---F-53B MinorF-53B Minor83329-89-9 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS ---ADONA4,8-dioxa-3H-perfluorononanoate958445-44-8 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---NaDONANaDONAEVS1361NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---DONADONA919005-14-4 NSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNSNS---77.876.20.20.00.00.40.20.20.10.10.30.00.177.81.076.80.01%99%0%600.5 174.919.80.235.081.453.342.511.318.7150.30.912.2600.5506.976.816.984%13%3%Notes:1. Estimated percentage contribution of pathway to total mass loading based on 1st Quartile Input Values for May 2019 event; see Table 10-B.2. Percentage of pathway contribution allocated to Site, Other, or Unknown sources per pathway per compound presented in Table 11.3. Abbreviations:ng/L - nanograms per literng/s - nanograms per secondND - Compound was not detected at laboratory detection limit.NS - Compound was analyzed for in collected sample(s) or sample was not collected.Table 3+ Lab SOPTotal Table 3+EPA Method 537 ModTotal EPA Method 537Total PFAS Mass LoadingPercentage of Total Concentration of PFAS from Other SourcesPercentage of Total Concentration of PFAS from Unknown SourcesAnalytical MethodCommon Name Chemical NameCASNTransport Pathway Number →Total PFAS ConcentrationTotal Concentration of PFAS Originating from FacilityTotal Concentration of PFAS from Other SourcesTotal Concentration of PFAS from Unknown SourcesPercentage of Concentration of PFAS Originating from FacilityAugust 2019 TABLE 9-AESTIMATED MASS LOADING WITH 1st QUARTILE INPUT VALUES - MAY 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, P.C123456A6B6C6D789Transport Pathway →Upstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep DOld Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch CreekCASNng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sHFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 NA 148,771 1,132 11,215 172,500 82,922 119,856 22,315 45,134 143,407 4,881 76,446 828,577PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NA 66,120 7550 54,794 35,770 70,824 3,099 8,801 40,668 3,254 45,868 329,953PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NA NA ND0NA NANANANANANANA -PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 NA 243,359 553 134,145 1,197,351 334,938 817,200 119,633 273,813 1,519,685 2,386 NA 4,643,065PFO2HxAPerfluoro(3,5-dioxahexanoic) acid 39492-88-1 117,455 192,392 1,635 90,283 507,352 154,462 234,264 40,911 87,259 385,272 7,050 64,215 1,882,549PFO3OAPerfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 NA 33,978 126 37,507 113,647 58,533 52,301 11,777 23,921 102,739 542 NA 435,072PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 NA 36,733 126 23,471 NA 35,770 7,082 3,037 7,071 34,246 542 NA 148,079`PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 NA 275,501 2,515 0 263,823 79,670 185,232 8,678 27,231 119,863 10,846 198,760 1,172,119Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 NA NA NA 2,803 NA 8,130 9,262 1,550 3,912 4,281 NA NA 29,936EVE AcidPerfluoroethoxypropionic acid69087-46-3 NA NA NA 1,449 NA 5,366 15,799 NA NA NA NA NA 22,614PFECA BPerfluoro-3,6-dioxaheptanoic acid 151772-58-6 NA NA NA0NA NA N`A NA NA NA NA NA-R-EVER-EVEEVS1428 NA NA NA 760 NA 5,203 10,896 744 3,310 3,639 NA NA 24,551PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NA 8,265 252 9,872 NA 20,161 1,144 60451 13,270 1,085 NA 54,561Byproduct 4Byproduct 4EVS1429 NA NA NA 3,577 NA 9,755 15,799 806 2,941 8,776 NA NA 41,654Byproduct 5Byproduct 5EVS1430 174,505 40,407 NA 4,516 NA 102,433 114,408 1,178 7,598 16,909 NA NA 461,952Byproduct 6Byproduct 6EVS1431 NA NA NA 1,986 NA 229 2893245NA NA NA 2,581NVHOSPerfluoroethoxysulfonic acid 1132933-86-8 137,590 NA NA 15,113 NA 4,553 14,710 1,240 2,415 17,765 NA NA 193,385PESPerfluoroethoxyethanesulfonic acid 113507-82-7 NA NA NA0NA NA NA NA NA NA NA NA-PFESA-BP1Byproduct 129311-67-9 NA NA ND 11,744 NA 24,064 10,896 NA NA NA NA NA 46,703PFESA-BP2Byproduct 2749836-20-2 NA 10,836 ND 27,396 NA 5,528 3,596 446 978 6,635 NA 5,045 60,461429,550 1,056,363 7,093 375,836 2,309,468 967,485 1,683,557 215,507 494,879 2,417,156 30,587 390,334 10,377,814PFBAPerfluorobutanoic acid375-22-4 208,063 1,837 NA NA 2,638 1,171 2,561 242 632 1,841 130 1,682 220,796PFDAPerfluorodecanoic acid335-76-2 NA NA NA NA NA NA12NA NA NA NA NA 12PFDoAPerfluorododecanoic acid307-55-1 NA NA NA NA NA NA NA NA NA NA NA NA-PFHpAPerfluoroheptanoic acid375-85-9 281,892 478 NA NA 304 390 763 149 283 535 NA 367 285,161PFNAPerfluorononanoic acid375-95-1 NA NA NA NA438565NA8161 NA NA 361PFOAPerfluorooctanoic acid335-67-1 231,554 1,616 NA NA9412093113468557581 234,846PFHxAPerfluorohexanoic acid307-24-4 405,062 845 NA NA 244 NA 202 NA 121 36464505 407,405PFPeAPerfluoropentanoic acid2706-90-3 402,703 2,204 NA NA 9,538 2,341 6,538 1,116 2,219 3,211 NA 1,529 431,399PFTeAPerfluorotetradecanoic acid376-06-7 NA NA NA NA NA NA NA NA NA NA NA NA-PFTriAPerfluorotridecanoic acid72629-94-8 NA NA NA NA NA NA NA NA NA NA NA NA-PFUnAPerfluoroundecanoic acid2058-94-8 NA NA NA NA NA NA NA NA NA NA NA NA-PFBSPerfluorobutanesulfonic acid375-73-5 104,032 661 NA NA45NA NA NA NA NA NA NA 104,738PFDSPerfluorodecanesulfonic acid335-77-3 NA NA NA NA NA NA NA NA NA NA NA NA-PFHpSPerfluoroheptanesulfonic acid375-92-8 NA NA NA NA NA NA NA NA NA NA NANA -PFHxSPerfluorohexanesulfonic acid355-46-4 157,725 404 NA NA 11011NA16NA NA NA 158,257PFNSPerfluorononanesulfonic acid68259-12-1 NA NA NA NA NA NA NA NA NA NA NANA -PFOSPerfluorooctanesulfonic acid1763-23-1 436,262 771 NA NA 24418131NA43NA 367 437,718PFPeSPerfluoropentanesulfonic acid2706-91-4 NA NA NA NA NA NA NA NA NA NA NA NA-10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NA NA NA NA NA NA NANANANANANA -4:2 FTS4:2 fluorotelomersulfonic acid 757124-72-4 NA NA NA NA NA NA NA NANANANANA -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NA NA NA NA NA NA NA NA NA NA NA NA-8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NA NA NA NA NA NA NA NA NA NA NA NA-NEtFOSAANEtFOSAA2991-50-6 NA NA NA NA NA NA NA NA NA NA NA NA-NEtPFOSANEtPFOSA4151-50-2 NA NA NA NA NA NA NA NA NA NA NA NA-NEtPFOSAENEtPFOSAE1691-99-2 NA NA NA NA NA NA NA NA NA NA NA NA-NMeFOSAANMeFOSAA2355-31-9 NA NA NA NA NA NA NA NA NA NA NA NA-NMePFOSANMePFOSA31506-32-8 NA NA NA NA NA NA NA NA NA NA NA NA-NMePFOSAENMePFOSAE24448-09-7 NA NA NA NA NA NA NA NA NA NA NA NA-PFDOSPerfluorododecanesulfonic acid 79780-39-5 NA NA NA NA NA NA NA NA NA NA NA NA-PFHxDAPerfluorohexadecanoic acid67905-19-5 NA NA NA NA NA NA NA NA NA NA NANA -PFODAPerfluorooctadecanoic acid16517-11-6 NA NA NA NA NA NA NA NA NA NA NA NA-PFOSAPerfluorooctanesulfonamide754-91-6 NA NA NA NA NA NA NA NA NA NA NA NA-F-53B MajorF-53B Major73606-19-6 NA NA NA NA NA NA NA NA NA NA NA NA-F-53B MinorF-53B Minor83329-89-9 NA NA NA NA NA NA NA NA NA NA NA NA-ADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NA NA NA NA NA NA NA NA NA NA NA NA-NaDONANaDONAEVS1361 NA NA NA NA NA NA NA NA NA NA NA NA-DONADONA919005-14-4 NA NA NA NA NA NA NA NA NA NA NA NA-2,227,295 8,816-- 13,259 4,136 10,245 1,520 3,303 6,839 252 5,030 2,280,6942,656,845 1,065,179 7,093 375,836 2,322,727 971,621 1,693,802 217,027 498,181 2,423,995 30,838 395,364 12,658,507Notes:1. Calculated mass loading presented in this table from the mass loading model.2. Abbreviations:ng/s - nanograms per secondNA - Sample was not detected at laboratory detection limit or was not analyzed for in collected sample.Total PFAS Mass LoadingTotal Esimated Mass LoadingTotal Table 3+Table 3+ Lab SOPTotal EPA Method 537EPA Method 537 ModTransport Pathway Number →Analytical MethodCommon NameChemical NameAugust 2019 TABLE 9-BESTIMATED MASS LOADING WITH 1st QUARTILE INPUT VALUES - JUNE 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC, P.C.123456A6B6C6D789Transport Pathway →Upstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep DOld Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch CreekCASNng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sng/sHFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 185,242 58,774 1,132 46,666 161,667 134,130 82,919 34,295 48,143 175,434 4,881 98,328 1,031,610PEPAPerfluoroethoxypropyl carboxylic acid 267239-61-2 NA 25,713 755 2,682 51,353 46,275 46,066 3,266 7,221 50,932 3,254 45,134 282,652PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NA NA ND70NA NA NA NA NA NA NA NA 70PFMOAAPerfluoro-2-methoxyaceticacid674-13-5 NA 148,771 553 207,833 1,122,161 482,867 482,158 162,492 270,804 2,574,917 2,386 22,567 5,477,510PFO2HxAPerfluoro(3,5-dioxahexanoic) acid 39492-88-1 118,125 77,140 1,635 123,323 475,492 201,195 119,772 45,727 72,214 509,324 7,050 64,477 1,815,475PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 NA 12,306 126 59,078 106,510 73,771 27,025 13,881 22,266 132,990 542 9,672 458,168PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 NA 2,939 126 54,683 NA 35,544 4,607 2,940 5,416 39,614 542 2,740 149,150PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 483,240 99,180 2,515 8,480 247,256 114,010 107,488 10,615 21,664 152,797 10,846 145,074 1,403,166Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 NA 992 NA 6,486 NA 9,389 6,756 1,715 3,611 5,659 NA 355 34,963EVE AcidPerfluoroethoxypropionic acid69087-46-3 NA NA NA 6,091 NA 6,505 13,206 NA NA 679 NA NA 26,481PFECA BPerfluoro-3,6-dioxaheptanoic acid 151772-58-6 NA NA NA24NA NA NA NA NA NA NA NA 24R-EVER-EVEEVS1428 53,693 5,143 NA 1,596 NA 7,377 9,827 1,551 3,009 5,659 NA 3,869 91,725PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NA 735 252 54,734 NA 30,850 829 NA 361 16,129 1,085 322 105,296Byproduct 4Byproduct 4EVS1429 212,089 7,530 NA 24,839 NA 11,401 11,977 1,225 2,528 11,035 NA 7,898 290,523Byproduct 5Byproduct 5EVS1430 617,474 49,590 NA 66,317 NA 120,717 104,416 2,531 6,620 31,125 NA NA 998,791Byproduct 6Byproduct 6EVS1431 NA NA NA 4,193 NA 335 2403351424 NA NA 5,276NVHOSPerfluoroethoxysulfonic acid 1132933-86-8 198,665 2,571 NA 38,944 NA 6,706 9,827 1,715 2,708 25,466 NA 725 287,329PESPerfluoroethoxyethanesulfonic acid 113507-82-7 NA NA NA 469 NA NA NA NA NA NA NA NA 469PFESA-BP1Byproduct 129311-67-9 NA NA ND 48,313 NA 35,544 8,906 NA NA 8,489 NA NA 101,252PFESA-BP2Byproduct 2749836-20-2 NA 3,122 ND 164,146 NA 8,718 2,887 539 1,173 9,904 NA 4,675 195,1641,868,529 494,506 7,093 918,968 2,164,439 1,325,336 1,038,907 282,525 467,789 3,750,579 30,587 405,836 12,755,093PFBAPerfluorobutanoic acid375-22-4 228,197 1,598 NA NA 2,473 1,610 1,843 327 632 2,547 130 1,773 241,128PFDAPerfluorodecanoic acid335-76-2 NA NA NA NA NA NA8NA NA NA NA NA8PFDoAPerfluorododecanoic acid307-55-1 NA NA NA NA NA NA NA NA NA NA NA NA-PFHpAPerfluoroheptanoic acid375-85-9 322,160 459 NA NA 285 530 522 188 301 736 NA 371 325,552PFNAPerfluorononanoic acid375-95-1 NA NA NA NA4010149NA8201 NA NA 399PFOAPerfluorooctanoic acid335-67-1 222,827 1,010 NA NA8824174134296257596 225,912PFHxAPerfluorohexanoic acid307-24-4 483,240 771 NA NA 228 NA 14481132 45364500 485,614PFPeAPerfluoropentanoic acid2706-90-3 536,934 1,782 NA NA 8,939 3,286 4,607 1,388 2,377 4,527 NA 1,596 565,436PFTeAPerfluorotetradecanoic acid376-06-7 NA NA NA NA NA NA NA NA NA NA NA NA-PFTriAPerfluorotridecanoic acid72629-94-8 NA NA NA NA NA NA NA NA NA NA NA NA-PFUnAPerfluoroundecanoic acid2058-94-8 NA NA NA NA NA NA NA NA NA NA NA NA-PFBSPerfluorobutanesulfonic acid375-73-5 120,810 680 NA NA4215NA NA NA NA NA NA 121,546PFDSPerfluorodecanesulfonic acid335-77-3 NA NA NA NA NA NA NA NA NA NA NA NA-PFHpSPerfluoroheptanesulfonic acid375-92-8 NA NA NA NA NA NA NA NA NA NA NANA -PFHxSPerfluorohexanesulfonic acid355-46-4 182,557 478 NA NA 10327726NA NA NA 183,179PFNSPerfluorononanesulfonic acid68259-12-1 NA NA NA NA NA NA NA NA NA NA NANA -PFOSPerfluorooctanesulfonic acid1763-23-1 402,700 661 NA NA 228657NA NA57NA NA 403,718PFPeSPerfluoropentanesulfonic acid2706-91-4 NA NA NA NA NA NA NA NA NA NA NA NA-10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NA NA NA NA NA NA NANANANANANA -4:2 FTS4:2 fluorotelomersulfonic acid 757124-72-4 NA NA NA NA NA NA NA NANANANANA -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NA NA NA NA NA NA NA NA NA NA NA NA-8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NA NA NA NA NA NA NA NA NA NA NA NA-NEtFOSAANEtFOSAA2991-50-6 NA NA NA NA NA NA NA NA NA NA NA NA-NEtPFOSANEtPFOSA4151-50-2 NA NA NA NA NA NA NA NA NA NA NA NA-NEtPFOSAENEtPFOSAE1691-99-2 NA NA NA NA NA NA NA NA NA NA NA NA-NMeFOSAANMeFOSAA2355-31-9 NA NA NA NA NA NA NA NA NA NA NA NA-NMePFOSANMePFOSA31506-32-8 NA NA NA NA NA NA NA NA NA NA NA NA-NMePFOSAENMePFOSAE24448-09-7 NA NA NA NA NA NA NA NA NA NA NA NA-PFDOSPerfluorododecanesulfonic acid 79780-39-5 NA NA NA NA NA NA NA NA NA NA NA NA-PFHxDAPerfluorohexadecanoic acid67905-19-5 NA NA NA NA NA NA NA NA NA NA NANA -PFODAPerfluorooctadecanoic acid16517-11-6 NA NA NA NA NA NA NA NA NA NA NA NA-PFOSAPerfluorooctanesulfonamide754-91-6 NA NA NA NA NA NA NA NA NA NA NA NA-F-53B MajorF-53B Major73606-19-6 NA NA NA NA NA NA NA NA NA NA NA NA-F-53B MinorF-53B Minor83329-89-9 NA NA NA NA NA NA NA NA NA NA NA NA-ADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NA NA NA NA NA NA NA NA NANA NANA-NaDONANaDONAEVS1361NA NA NA NA NA NA NA NA NA NA NA NA-DONADONA919005-14-4 NA NA NA NA NA NA NA NA NA NA NA NA-2,499,426 7,439-- 12,427 5,874 7,260 1,998 3,499 9,482 252 4,836 2,552,4924,367,955 501,944 7,093 918,968 2,176,865 1,331,210 1,046,167 284,523 471,288 3,760,061 30,838 410,672 15,307,585Notes:1. Calculated mass loading presented in this table from the mass loading model.2. Abbreviations:ng/s - nanograms per secondNA - Sample was not detected at laboratory detection limit or was not analyzed for in collected sample.Total PFAS Mass LoadingTransport Pathway Number →Analytical MethodCommon Name Chemical NameTotal Esimated Mass LoadingTable 3+ Lab SOPTotal Table 3+EPA Method 537 ModTotal EPA Method 537August 2019 TABLE 10-AESTIMATED CONTRIBUTION PERCENTAGE OF PATHWAY TO TOTAL MASS LOADING - MAY 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, P.C1 23456A6B6C6D7 8 9Transport Pathway →Upstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch CreekCASN% %%%%%%%%% % %HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 NA18.0%0.1%1.4%20.8%10.0%14.5%2.7%5.4%17.3%0.6%9.2%PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 NA20.0%0.2%0.0%16.6%10.8%21.5%0.9%2.7%12.3%1.0%13.9%PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NANANANANANANANANANANANAPFMOAAPerfluoro-2-methoxyaceticacid674-13-5NA5.2%0.0%2.9%25.8%7.2%17.6%2.6%5.9%32.7%0.1%NAPFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 6.2%10.2%0.1%4.8%27.0%8.2%12.4%2.2%4.6%20.5%0.4%3.4%PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 NA7.8%0.0%8.6%26.1%13.5%12.0%2.7%5.5%23.6%0.1%NAPFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 NA24.8%0.1%15.9%NA24.2%4.8%2.1%4.8%23.1%0.4%NAPMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 NA23.5%0.2%0.0%22.5%6.8%15.8%0.7%2.3%10.2%0.9%17.0%Hydro-EVE AcidPerfluoroethoxsypropanoic acid 773804-62-9 NANANA9.4%NA27.2%30.9%5.2%13.1%14.3%NANAEVE AcidPerfluoroethoxypropionic acid69087-46-3 NANANA6.4%NA23.7%69.9%NANANANANAPFECA BPerfluoro-3,6-dioxaheptanoic acid 151772-58-6 NANANANANANANANANANANANAR-EVER-EVEEVS1428 NANANA3.1%NA21.2%44.4%3.0%13.5%14.8%NANAPFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NA15.1%0.5%18.1%NA37.0%2.1%0.1%0.8%24.3%2.0%NAByproduct 4Byproduct 4EVS1429 NANANA8.6%NA23.4%37.9%1.9%7.1%21.1%NA NAByproduct 5Byproduct 5EVS1430 37.8%8.7%NA1.0%NA22.2%24.8%0.3%1.6%3.7%NANAByproduct 6Byproduct 6EVS1431 NANANA76.9%NA8.9%11.2%1.2%1.7%NANANANVHOSPerfluoroethoxysulfonic acid1132933-86-8 71.1%NANA7.8%NA2.4%7.6%0.6%1.2%9.2%NANAPESPerfluoroethoxyethanesulfonic acid 113507-82-7 NANANANANANANANANANA NA NAPFESA-BP1Byproduct 129311-67-9 NANANA25.1%NA51.5%23.3%NANANANANAPFESA-BP2Byproduct 2749836-20-2 NA17.9%NA45.3%NA9.1%5.9%0.7%1.6%11.0%NA8.3%PFBAPerfluorobutanoic acid375-22-4 94.2%0.8%0.0%NA1.2%0.5%1.2%0.1%0.3%0.8%0.1%0.8%PFDAPerfluorodecanoic acid335-76-2NANANANANANA100%NANANANANAPFDoAPerfluorododecanoic acid307-55-1NANANANANANANANANANANANAPFHpAPerfluoroheptanoic acid375-85-9 98.8%0.2%NANA0.1%0.1%0.3%0.1%0.1%0.2%NA0.1%PFNAPerfluorononanoic acid375-95-1NANANANA11.1%22.0%17.0%NA2.1%41.7%NANAPFOAPerfluorooctanoic acid335-67-1 98.6%0.7%0.0%NA0.0%0.1%0.0%0.0%0.0%0.3%0.0%0.2%PFHxAPerfluorohexanoic acid307-24-4 99.4%0.2%0.0%NA0.1%NA0.0%NA0.0%0.1%0.0%0.1%PFPeAPerfluoropentanoic acid2706-90-3 93.3%0.5%NANA2.2%0.5%1.5%0.3%0.5%0.7%NA0.4%PFTeAPerfluorotetradecanoic acid376-06-7NANANANANANANANANANANANAPFTriAPerfluorotridecanoic acid72629-94-8 NANANANANANANANANANANANAPFUnAPerfluoroundecanoic acid2058-94-8 NANANANANANANANANANANANAPFBSPerfluorobutanesulfonic acid375-73-5 99.3%0.6%NANA0.0%NANANANANANANAPFDSPerfluorodecanesulfonic acid335-77-3NANANANANANANANANANANANAPFHpSPerfluoroheptanesulfonic acid375-92-8NANANANANANANANANANANANAPFHxSPerfluorohexanesulfonic acid355-46-4 99.6%0.3%NANA0.1%0.0%NA0.0%0.0%NANANAPFNSPerfluorononanesulfonic acid68259-12-1 NANANANANANANANANANANANAPFOSPerfluorooctanesulfonic acid1763-23-1 99.6%0.2%NANA0.1%0.0%0.0%0.0%NA0.0%NA0.1%PFPeSPerfluoropentanesulfonic acid2706-91-4 NANANANANANANANANANANANA10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NANANANANANANANANANA NA NA4:2 FTS4:2 fluorotelomersulfonic acid757124-72-4 NANANANANANANANANANA NA NA6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NANANANANANANANANANANANA8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NANANANANANANANANANANANANEtFOSAANEtFOSAA2991-50-6 NANANANANANANANANANANANANEtPFOSANEtPFOSA4151-50-2 NANANANANANANANANANANANANEtPFOSAENEtPFOSAE1691-99-2 NANANANANANANANANANANANANMeFOSAANMeFOSAA2355-31-9 NANANANANANANANANANANANANMePFOSANMePFOSA31506-32-8 NANANANANANANANANANANANANMePFOSAENMePFOSAE24448-09-7 NANANANANANANANANANANANAPFDOSPerfluorododecanesulfonic acid79780-39-5 NANANANANANANANANANANANAPFHxDAPerfluorohexadecanoic acid67905-19-5 NANANANANANANANANANANANAPFODAPerfluorooctadecanoic acid16517-11-6 NANANANANANANANANANANANAPFOSAPerfluorooctanesulfonamide754-91-6NANANANANANANANANANANANAF-53B MajorF-53B Major73606-19-6 NANANANANANANANANANANANAF-53B MinorF-53B Minor83329-89-9 NANANANANANANANANANANANAADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NANANANANANANANANANANANANaDONANaDONAEVS1361 NANANANANANANANANANANANADONADONA919005-14-4 NANANANANANANANANANANANANotes:1. Estimated contribution percentage of pathway to total mass loading presented in this table is for the May 2019 sampling event from the mass loading model. The estimated contribution percentage is based on 1st Quartile Input Values.2. Abbreviations:ng/s - nanograms per secondNA - Sample was not detected at laboratory detection limit or was not analyzed for in collected sample.Analytical MethodCommon NameChemical NameTransport Pathway Number →Table 3+ Lab SOPEPA Method 537 ModAugust 2019 TABLE 10-BESTIMATED CONTRIBUTION PERCENTAGE OF PATHWAY TO TOTAL MASS LOADING - JUNE 2019Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, P.C123456A6B6C6D789Transport Pathway →Upstream River and GroundwaterWillis CreekAerial Deposition on RiverOutfall 002Onsite GroundwaterSeep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch CreekCASN%%%%%%%%%%%%HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 18.0%5.7%0.1%4.5%15.7%13.0%8.0%3.3%4.7%17.0%0.5%9.5%PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 NA9.1%0.3%0.9%18.2%16.4%16.3%1.2%2.6%18.0%1.2%16.0%PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NANANA100.0%NANANANANANANANAPFMOAAPerfluoro-2-methoxyaceticacid674-13-5 NA2.7%0.0%3.8%20.5%8.8%8.8%3.0%4.9%47.0%0.0%0.4%PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 6.5%4.2%0.1%6.8%26.2%11.1%6.6%2.5%4.0%28.1%0.4%3.6%PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 NA2.7%0.0%12.9%23.2%16.1%5.9%3.0%4.9%29.0%0.1%2.1%PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 NA2.0%0.1%36.7%NA23.8%3.1%2.0%3.6%26.6%0.4%1.8%PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 34.4%7.1%0.2%0.6%17.6%8.1%7.7%0.8%1.5%10.9%0.8%10.3%Hydro-EVE AcidPerfluoroethoxsypropanoic acid 773804-62-9 NA2.8%NA18.6%NA26.9%19.3%4.9%10.3%16.2%NA1.0%EVE AcidPerfluoroethoxypropionic acid69087-46-3 NANANA23.0%NA24.6%49.9%NANA2.6%NANAPFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 NANANA100.0%NANANANANANANANAR-EVER-EVEEVS1428 58.5%5.6%NA1.7%NA8.0%10.7%1.7%3.3%6.2%NA4.2%PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 NA0.7%0.2%52.0%NA29.3%0.8%NA0.3%15.3%1.0%0.3%Byproduct 4Byproduct 4EVS1429 73.0%2.6%NA8.5%NA3.9%4.1%0.4%0.9%3.8%NA2.7%Byproduct 5Byproduct 5EVS1430 61.8%5.0%NA6.6%NA12.1%10.5%0.3%0.7%3.1%NANAByproduct 6Byproduct 6EVS1431 NANANA79.5%NA6.4%4.5%0.6%1.0%8.0%NANANVHOSPerfluoroethoxysulfonic acid1132933-86-8 69.1%0.9%NA13.6%NA2.3%3.4%0.6%0.9%8.9%NA0.3%PESPerfluoroethoxyethanesulfonic acid 113507-82-7 NANANA100.0%NANANANANANANANAPFESA-BP1Byproduct 129311-67-9 NANANA47.7%NA35.1%8.8%NANA8.4%NANAPFESA-BP2Byproduct 2749836-20-2 NA1.6%NA84.1%NA4.5%1.5%0.3%0.6%5.1%NA2.4%PFBAPerfluorobutanoic acid375-22-4 94.6%0.7%0.0%0.0%1.0%0.7%0.8%0.1%0.3%1.1%0.1%0.7%PFDAPerfluorodecanoic acid335-76-2 NANANANANANA24.9%NANANANANAPFDoAPerfluorododecanoic acid307-55-1 NANANANANANANANANANANANAPFHpAPerfluoroheptanoic acid375-85-9 98.9%0.1%NA0.0%0.1%0.2%0.2%0.1%0.1%0.2%NA0.1%PFNAPerfluorononanoic acid375-95-1 NANANANA9.4%23.8%11.6%NA2.0%47.5%NANAPFOAPerfluorooctanoic acid335-67-1 98.6%0.4%0.0%0.0%0.0%0.1%0.0%0.0%0.0%0.4%0.0%0.3%PFHxAPerfluorohexanoic acid307-24-4 99.5%0.2%0.0%0.0%0.0%NA0.0%0.0%0.0%0.1%0.0%0.1%PFPeAPerfluoropentanoic acid2706-90-3 94.9%0.3%NA0.0%1.6%0.6%0.8%0.2%0.4%0.8%NA0.3%PFTeAPerfluorotetradecanoic acid376-06-7 NANANANANANANANANANANANAPFTriAPerfluorotridecanoic acid72629-94-8 NANANANANANANANANANANANAPFUnAPerfluoroundecanoic acid2058-94-8 NANANANANANANANANANANANAPFBSPerfluorobutanesulfonic acid375-73-5 99.4%0.6%NA0.0%0.0%0.0%NANANANANANAPFDSPerfluorodecanesulfonic acid335-77-3 NANANANANANANANANANANANAPFHpSPerfluoroheptanesulfonic acid375-92-8 NANANANANANANANANANANANAPFHxSPerfluorohexanesulfonic acid355-46-4 99.6%0.3%NA0.0%0.1%0.0%0.0%0.0%0.0%NANANAPFNSPerfluorononanesulfonic acid68259-12-1 NANANANANANANANANANANANAPFOSPerfluorooctanesulfonic acid1763-23-1 99.7%0.2%NA0.0%0.1%0.0%0.0%NANA0.0%NANAPFPeSPerfluoropentanesulfonic acid2706-91-4 NANANANANANANANANANANANA10:2 FTS10:2-fluorotelomersulfonic acid 120226-60-0 NANANANANANANANANANANANA4:2 FTS4:2 fluorotelomersulfonic acid757124-72-4 NANANANANANANANANANANANA6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2 NANANANANANANANANANANANA8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4 NANANANANANANANANANANANANEtFOSAANEtFOSAA2991-50-6 NANANANANANANANANANANANANEtPFOSANEtPFOSA4151-50-2 NANANANANANANANANANANANANEtPFOSAENEtPFOSAE1691-99-2 NANANANANANANANANANANANANMeFOSAANMeFOSAA2355-31-9 NANANANANANANANANANANANANMePFOSANMePFOSA31506-32-8 NANANANANANANANANANANANANMePFOSAENMePFOSAE24448-09-7 NANANANANANANANANANANANAPFDOSPerfluorododecanesulfonic acid79780-39-5 NANANANANANANANANANANANAPFHxDAPerfluorohexadecanoic acid67905-19-5 NANANANANANANANANANANANAPFODAPerfluorooctadecanoic acid16517-11-6 NANANANANANANANANANANANAPFOSAPerfluorooctanesulfonamide754-91-6 NANANANANANANANANANANANAF-53B MajorF-53B Major73606-19-6 NANANANANANANANANANANANAF-53B MinorF-53B Minor83329-89-9 NANANANANANANANANANANANAADONA4,8-dioxa-3H-perfluorononanoate 958445-44-8 NANANANANANANANANANANANANaDONANaDONAEVS1361 NANANANANANANANANANANANADONADONA919005-14-4 NANANANANANANANANANANANANotes:1. Estimated contribution percentage of pathway to total mass loading presented in this table is for the June 2019 sampling event from the mass loading model. The estimated contribution percentage is based on 1st Quartile Input Values.2. Abbreviations:ng/s - nanograms per secondNA - Sample was not detected at laboratory detection limit or was not analyzed for in collected sample.Transport Pathway Number →Analytical Method Common NameChemical NameTable 3+ Lab SOPEPA Method 537 ModAugust 2019 TABLE 11ESTIMATED MASS LOADING SOURCE ORIGINATION PERCENTAGES PER COMPOUND PER PATHWAYChemours Fayetteville Works, North CarolinaGeosyntec Consultants NC P.C.Transport Pathway →SourceSite Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other Unknown Site Other UnknownCASNHFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFO2HxA Perfluoro(3,5-dioxahexanoic) acid39492-88-1 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid39492-89-2 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100%--PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -Hydro-EVE Acid Perfluoroethoxsypropanoic acid773804-62-9 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -EVE AcidPerfluoroethoxypropionic acid69087-46-3 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFECA BPerfluoro-3,6-dioxaheptanoic acid151772-58-6 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -R-EVER-EVEEVS1428 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -Byproduct 4Byproduct 4EVS1429 75% - 25% 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -Byproduct 5Byproduct 5EVS1431 86% - 14% 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -Byproduct 6Byproduct 6EVS1430 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -NVHOSPerfluoroethoxysulfonic acid1132933-86-8 1% - 99% 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PESPerfluoroethoxyethanesulfonic acid113507-82-7 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFESA-BP1Byproduct 129311-67-9 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFESA-BP2Byproduct 2749836-20-2 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - -PFBAPerfluorobutanoic acid375-22-4- 100% - - 100% - - 100% - 100% - - 95% 5% - 97% 3% - 98% 2% - 97% 3% - 95% 5% - 89% 11% - - 100% - - 88% 12%PFDAPerfluorodecanoic acid335-76-2- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFDoAPerfluorododecanoic acid307-55-1- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFHpAPerfluoroheptanoic acid375-85-9- 100% - - 100% - - 100% - 100% - - 60% 40% - 83% 17% - 87% 13% - 91% 9% - 79% 21% - 22% 78% - - 100% - - 100% -PFNAPerfluorononanoic acid375-95-1- 100% - - 100% - - 100% - 100% - - - 100% - 84% 16% - 71% 29% - - 100% - - 100% - 44% 56% - - 100% - - 100% -PFOAPerfluorooctanoic acid335-67-1- 100% - - 100% - - 100% - 100% - - - 100% - 68% 32% - 41% 59% - 31% 69% - - 100% - 64% 36% - - 100% - - 100% -PFHxAPerfluorohexanoic acid307-24-4- 100% - - 100% - - 100% - 100% - - - 100% - 29% 71% - 41% 59% - 66% 34% - 33% 67% - - 100% - - 100% - - 100% -PFPeAPerfluoropentanoic acid2706-90-3- 100% - - 100% - - 100% - 100% - - 96% 4% - 97% 3% - 99% 1% - 99% 1% - 97% 3% - 86% 14% - - 100% - - 100% -PFTeAPerfluorotetradecanoic acid376-06-7- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFTriAPerfluorotridecanoic acid72629-94-8- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFUnAPerfluoroundecanoic acid2058-94-8- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFBSPerfluorobutanesulfonic acid375-73-5- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFDSPerfluorodecanesulfonic acid335-77-3- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFHpSPerfluoroheptanesulfonic acid375-92-8- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFHxSPerfluorohexanesulfonic acid355-46-4- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFNSPerfluorononanesulfonic acid68259-12-1- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFOSPerfluorooctanesulfonic acid1763-23-1- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFPeSPerfluoropentanesulfonic acid2706-91-4- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -10:2 FTS10:2-fluorotelomersulfonic acid120226-60-0 - 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -4:2 FTS4:2 fluorotelomersulfonic acid757124-72-4 - 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -6:2 FTS6:2 fluorotelomersulfonic acid27619-97-2- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -8:2 FTS8:2 fluorotelomersulfonic acid39108-34-4- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NEtFOSAANEtFOSAA2991-50-6- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NEtPFOSANEtPFOSA4151-50-2- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NEtPFOSAENEtPFOSAE1691-99-2- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NMeFOSAANMeFOSAA2355-31-9- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NMePFOSANMePFOSA31506-32-8- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NMePFOSAENMePFOSAE24448-09-7- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFDOSPerfluorododecanesulfonic acid79780-39-5- 100% - - 100% - - 100% -100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFHxDAPerfluorohexadecanoic acid67905-19-5- 100%-- 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFODAPerfluorooctadecanoic acid16517-11-6- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -PFOSAPerfluorooctanesulfonamide754-91-6- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -F-53B MajorF-53B Major73606-19-6- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -F-53B MinorF-53B Minor83329-89-9- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -ADONA4,8-dioxa-3H-perfluorononanoate958445-44-8 - 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -NaDONANaDONAEVS1361- 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -DONADONA919005-14-4 - 100% - - 100% - - 100% - 100% - - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% - - 100% -Notes:1. The source of the mass loading was estimated by compound and pathway as either Site (generated from the Site), Other (generated from Other sources), or Unknown (compound may be generated from either the Site or Other sources).4. For Pathway 3, all Table 3+ compounds were estimated to originate from the Site. All EPA 537 compounds were estimated to originate from Other sources.4. For Pathway 4, all Table 3+ compounds and EPA 537 compounds estimated to originate from the Site. This Pathway only represents new loading introduced by the Site to the river by Outfall 002 and does not account for PFAS present in water collected at the intake. 2. For Pathway 1, Table 3+ compounds were estimated to oringinate from the Site with the exception of Byproduct 4, Byproduct 5 and NVHOS whose detection in upstream river samples was not consistent with known loading pathways for PFAS originating from the Site. The fraction of these compounds originating from the Site was calculated using June event Table 3+ data where the River Mile 76 concentrations of each of the three compounds were subtracted from the River Mile 56 concentrations of each of the three compounds and then deivided by the River Mile 76 concentration. The remainder contriubtion were estimated to originate from unkown sources. All EPA 537 compounds were estimated to originate from Other sources.3. For Pathways 2, 5, 6, and 7, all Table 3+ compounds were estimated to orignate from the Site. For the EPA 537 compounds, the percentage increase between the median Pathway concentration for all sampling events and the median Upriver [Pathway 1] concentration for all sampling events were estimated to originate from the Site. If the Pathway median was not detected or less than the Upriver concentration, then the contribution from the Site was estimated to be 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources.5. For Pathway 8, all Table 3+ compounds were estimated to originate from the Site. For the EPA 537 compounds, the percentage increase between the estimated median offsite groundwater concentration and the median Upriver [Pathway 1] concentration for all sampling events was esimated to originate from Unknown sources. If the estimated median offsite groundwater concentration was not detected or less than the median Upriver concentration, then the Unknown portion was considered 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources.6. For Pathway 9, all Table 3+ compounds were estimated to originate from the Site. For the EPA 537 compounds, the percentage increase between the median Pathway concentration for all sampling events and the median Upriver [Pathway 1] concentration for all sampling events was estimated to originate from Unknown sources. If the median Pathway concentration was not detected or less than the median Upriver concentration, then the Unknown portion was considered 0%. The remaining EPA 537 compound percentages were estimated to originate from Other sources.EPA Method 537 Mod6C6DTransport Pathway Number →12345Aerial Deposition on River Outfall 002 Onsite Groundwater6A 6B9Table 3+ Lab SOP78Seep A Seep B Seep C Seep D Old Outfall 002Adjacent and Downstream GroundwaterGeorgia Branch CreekUpstream River and GroundwaterWillis CreekAnalytical MethodCommon Name Chemical NameAugust 2019 FIGURES ") ") ") Willis Creek Old Outfall 002Cape Fear RiverOutfall 002 W.O. Huske Dam Site River Water Intake NC Highway 87 Seep A Seep B Seep C Seep D GBCTributary1GeorgiaBranchCreek Site Location Map Figure 1Raleigh, NC 2,000 0 2,0001,000 Feet ³ August 2019 Legend ")Site Features Cape Fear River Nearby Tributaries Observed Seep (Natural Drainage) Site Drainage Network Site Boundary Notes:Basemap Sources: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID,IGN, and the GIS User Community Areas at Site Chemours Monomers IXM Chemours PPA Dupont / Dow Leased Former DuPont PMDF Area Kuraray America Leased Wastewater Treatment Plant Chemours Fayetteville Works, North Carolina RainRain Cape F e ar Ri v e r Cape F e ar Ri v e r Perched Zo n e Surficial Aq u i f e r Black Cre e k Aquifer Groun d w a t e r ChemoursFayetteville WorksManufacturing Area ChemoursFayetteville WorksManufacturing Area Perched Zone Clay Black CreekConfining Unit Perched Zone Clay Black CreekConfining Unit Non-contact cooling water from river Non-Chemours treated process water Stormwater (4) Outfall 002 (Pipe to River) Groundwater Seep B Seep A Seep C Seep D (1) Upstream Cape Fear River (3) Aerial Deposition (9) G e orgi a Branch Creek (2) Willis Creek ( 7 ) Old Outfall 0 02(6) Seeps ( 5 ) OnSite Groundwater (8) Adjacentand Downstream (3) Aerial Deposition (9) G e orgi a Branch Creek (2) Willis Creek ( 7 ) Old Outfall 0 02(6) Seeps ( 5 ) OnSite Groundwater ( 8 ) A dja cent and W.O. Huske DamW.O. Huske Dam Upper Cape Fear Confining Unit(4) Outfall 002 (Pipe to River) (1) Upstream Cape Fear River Down stre a m Groundwater ( 8 ) A dja cent and Down stre a m Groundwater Groundwater (8) Adjacentand Downstream Raleigh, NC August 2019 Figure 2 Potential PFAS Pathways to the Cape Fear River from Site Chemours Fayetteville Works, North Carolina Note: Image is conceptual and is not to scale. Cape Fear Lockand Dam #1/ Kings Bluff Intake Canal ChemoursFayettevilleWorks Start ofCape FearRiver Greensboro Wilmington Fayetteville Raleigh Bladen Bluffs Intake WO HuskeLock and Dam Virginia NorthCarolina SouthCarolina Cape Fear River Watershed and DownstreamPublic Utility Intakes Chemours Fayetteville Works, North Carolina Figure 3Raleigh, NC 20 0 2010 Miles August 2019 Legend Chemours Fayetteville Works Cape Fear River State Boundaries Upper Basin Middle Basin Lower Basin ³Dee p R i v er HawRiver LittleRiver CapeFearRiver Notes:Basemap and state boundaries provided by Esri, Garmin, USGS, NPS Comparison of Observed and Best-fit Modeled Total Table 3+ Mass Loading at Bladen Bluffs Chemours, Fayetteville Works, North Carolina Figure 4 Raleigh, NC August 2019 Notes: -Best-fit model estimated mass loading based on 1st Quartile input parameter value scenario -Total Table 3+ includes HFPO-DA (hexaflouropropylene oxide dimer acid) Acronyms: -mg/s: milligrams per second 0 2 4 6 8 10 12 14 16 May 2019 June 2019Total Table 3+ Mass Loading (mg/s)Model Estimated Total Table 3+ Mass Loading Observed Total Table 3+ Mass Loading Estimated Pathway Contributions to Observed Total Table 3+ Concentrations Adjacent to Bladen Bluffs Intake Chemours, Fayetteville Works, North Carolina Figure 5 Raleigh August 2019 0 100 200 300 400 500 600 May JuneObserved Total Table 3+ Concentration (ng/L)Legend: Upstream River and Groundwater Willis Creek Aerial Deposition on River Outfall 002 Onsite Groundwater Seeps Old Outfall 002 Adjacent and Downstream Groundwater Georgia Branch Creek Notes: ‐ February 2019 sampling even not plotted since not all Table 3+ compounds were analyzed for in collectedsamples due to analytical method not yet being finalized. ‐ Pathway percentage based on Input Parameters 1st Quartile Values Scenario ‐Total Table 3+ includes HFPO‐DA: (hexaflouropropyleneoxide dimer acid) Acronyms: ‐ ng/L: nanograms per liter Modeled and Empirical HFPO-DA Time Series at Kings Bluff Chemours Fayetteville Works, North CarolinaFigure6Raleigh, NCAugust 2019020406080100120140HFPO‐DA Concentration (ng/L)Modeled ConcentrationKings Bluff Finished Water Detected DataKings Bluff Raw Water Intake Detected DataNotes: ‐ Modeled HFPO‐DA concentrations are calculated based on calculated and estimated mass fluxes from off‐Site and on‐Site groundwater, nearby tributaries, Outfall 002.‐ All water intake HFPO‐DA results are detected. ‐ Plotted Kings Bluff Data are a combined set of publicly accessed data from downriver intakes including Cape Fear Public Utility Authority, North Carolina Department of Environmental Quality, Brunswick County, Pender County and data provided directly from Cape Fear Public Utility Authority.Acronyms: ‐ HFPO‐DA: Hexafluoropropylene oxide dimer acid‐ ng / L: nanograms per liter Estimated Source of Observed Total PFAS Concentration at Bladen Bluffs and Kings Bluff Chemours Fayetteville Works, North Carolina Figure 7 Raleigh, NC August 2019 Notes: ‐ Source of Total PFAS based on the estimated contribution percentage of each pathway to the total mass loading and the estimated origination of that pathway from Site, Other or Unknown sources for compounds analyzed for and detected in samples of river water. Acronyms: ‐ PFAS: per‐ and polyflouroalkyl substances ‐ ng/L: nanograms per liter 0 100 200 300 400 500 600 700 Bladen Bluffs Kings Bluff Bladen Bluffs Kings BluffTotal PFAS Concentration (ng/L)PFAS Originating from Facility PFAS Originating from Other Sources PFAS Originating from Unknown Sources May 2019 June 2019 Appendix A – Supplemental Analytical Data 1 August 2019 APPENDIX A SUPPLEMENTAL ANALYTICAL DATA APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 0.00290 J Y 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.00610 Y 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.00570 Y 0.00170 20279181FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00790 U UJ N 0.00790 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.00350 Y 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.00520 U N 0.00520 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 J Y 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.00370 Y 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00087 U N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00520 U N 0.00520 20279181FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.10000 U N 0.10000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00790 U UJ N 0.00790 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00087 U N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00087 U UJ N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00087 U N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.05000 U N 0.05000 20279181FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 0.00520 U N 0.00520 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.00780 Y 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.00170 U N 0.00170 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00260 U N 0.00260 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.00170 U UJ N 0.00170 20279181FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00087 U UJ N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00087 U N 0.00087 2027918 1 FAY-SW-CFR-RM-76-020219 LANC CFR-MILE-76 2/4/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.05000 2027918 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.00410 H Y 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.01000 U,H N 0.01000 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.00400 U N 0.00400 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.00200 280-124268-11FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.02000 280-124268-1 Page 1 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00840 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00310 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00620 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00470 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.00200 280-124268-11FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.02000 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified PFOA 335-67-1 0.00690 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.00350 H Y 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.02000 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.00500 U,H N 0.00500 280-124268-31FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.02000 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified PFOS 1763-23-1 0.01300 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.02000 U,H N 0.02000 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00200 U,H N 0.00200 280-124268-31FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.02000 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.01200 Y 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.00200 280-124268-1 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.00520 H,F1 J Y 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.00200 U,H,F1 N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.00200 U,H,F1 N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-052219 TAL-SAC CFR-MILE-76 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U,H N 0.00200 280-124268-3 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U N 0.00200 280-124971-11FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.00690 Y 0.00400 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.01800 Y 0.01000 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.00740 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.00440 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.02000 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified PFOA 335-67-1 0.00830 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.02000 280-124971-11FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.00200 280-124971-1 Page 2 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00680 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00850 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00450 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.01200 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00200 U N 0.00200 280-124971-11FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.00500 U N 0.00500 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.02000 280-124971-11FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.02000 Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.02000 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.02000 U N 0.02000 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified PFOS 1763-23-1 0.01500 I Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.02000 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.00790 F1 J Y 0.00200 280-124971-11FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.00200 F1,^J Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.02300 F1,^J Y 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.00200 280-124971-1 1 FAY-SW-CFR-RM-76-060719 TAL-SAC CFR-MILE-76 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.04600 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00260 U N 0.00260 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.05400 U,H N 0.05400 320-51045-1 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.06000 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 0.29000 J Y 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.44000 Y 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 1.20000 H Y 0.57000 320-51045-12FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U,H N 0.01500 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00770 U UJ N 0.00770 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.03500 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.00470 Y 0.00085 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.00250 Y 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00260 U N 0.00260 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U,H N 0.02700 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.00170 U N 0.00170 20285532FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00310 Y 0.00085 2028553 Page 3 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.00540 Y 0.00510 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.00180 Y 0.00085 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00085 U N 0.00085 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00510 U N 0.00510 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00770 U UJ N 0.00770 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.03700 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.10000 U N 0.10000 20285532FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.03400 H Y 0.03400 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.05000 U N 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.07900 U,H N 0.07900 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.31000 Y 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.33000 H Y 0.08100 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05200 Y 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05800 H Y 0.05800 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.05000 U N 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.03000 U,H N 0.03000 320-51045-1 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.02400 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00085 U N 0.00085 20285532FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00085 U UJ N 0.00085 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.49000 Y 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.21000 U,H N 0.21000 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00085 U N 0.00085 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.00260 U N 0.00260 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00260 U N 0.00260 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05000 U N 0.05000 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00260 U N 0.00260 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00260 U UJ N 0.00260 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11000 320-51045-12FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.00230 Y 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00260 U UJ N 0.00260 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.06000 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.13000 Y 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.19000 H Y 0.04700 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00170 U N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 0.00670 Y 0.00510 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.16000 U,H N 0.16000 320-51045-1 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U,H N 0.07000 320-51045-12FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.05000 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.04100 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.00170 U UJ N 0.00170 2028553 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00085 U UJ N 0.00085 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U,H N 0.02800 320-51045-1 2 FAY-SW-WC-1-020719 LANC WC-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00085 U N 0.00085 2028553 2 FAY-SW-WC-1-020719 TAL-SAC WC-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.09100 H Y 0.05800 320-51045-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.06000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 2.40000 Y 0.57000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.05400 U N 0.05400 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.04600 280-124323-12FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U N 0.01500 280-124323-1 Page 4 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U N 0.02700 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.03500 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.38000 Y 0.05800 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 2.00000 Y 0.08100 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.20000 Y 0.07900 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.03400 U N 0.03400 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U N 0.03700 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 1.30000 Y 0.21000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U N 0.02400 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.05900 Y 0.03000 280-124323-12FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.72000 Y 0.04700 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.06000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.05800 U,F1 UJ N 0.05800 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U N 0.02800 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.04100 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U N 0.07000 280-124323-1 2 FAY-SW-WC-1-TR2-052219 TAL-SAC WC-1 5/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.16000 U N 0.16000 280-124323-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.04600 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.05400 U,H N 0.05400 280-124599-12FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 1.20000 H Y 0.57000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.81000 E Y 0.00400 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.06000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U,H N 0.01500 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.03500 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified PFOA 335-67-1 0.00880 Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U,H N 0.02700 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.02000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.00200 280-124599-12FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00260 Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00220 I Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00360 Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.01000 Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.02000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.03700 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.04500 H Y 0.03400 280-124599-12FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.07900 U,H N 0.07900 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.73000 H Y 0.08100 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.12000 H Y 0.05800 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.03000 U,H N 0.03000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.02400 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 1.40000 H Y 0.21000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.02000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11000 280-124599-12FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.02000 280-124599-1 Page 5 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.06000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified PFOS 1763-23-1 0.00420 I Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.24000 H Y 0.04700 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.01200 Y 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.02000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.16000 U,H N 0.16000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U,H N 0.07000 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.04100 280-124599-12FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U,H N 0.02800 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.00200 280-124599-1 2 FAY-SW-WC-1-053019 TAL-SAC WC-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.22000 H,F1 J Y 0.05800 280-124599-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.32000 Y 0.00400 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.54000 H,F1 J Y 0.01000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.01400 H Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U,H N 0.00200 280-124971-12FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00870 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00370 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00260 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00250 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.00200 280-124971-12FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified PFOA 335-67-1 0.00550 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U,H,*N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.06700 H Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.42000 H,F1 J Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.01600 H Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00400 H,*J Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U,H,*N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.00200 280-124971-12FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.81000 H Y 0.00500 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.01700 H Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.00970 Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.14000 H Y 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified PFOS 1763-23-1 0.00360 I Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.00200 280-124971-12FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U,H N 0.00200 280-124971-1 Page 6 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.02000 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.27000 H,F1 J Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00540 H Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U,H N 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.02800 H,F1 J Y 0.00200 280-124971-1 2 FAY-SW-WC-1-060719 TAL-SAC WC-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.04100 H,F1 J Y 0.00200 280-124971-1 4 O90618 Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.02700 H Y 0.01000 280-125541-1 4 O90620 Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03300 H Y 0.01000 280-125541-14O90625Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04400 Y 0.01000 280-125815-1 4 O90627 Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.02800 Y 0.01000 280-125815-1 4 O90701 Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03300 Y 0.01000 280-125979-1 4 O90703 Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04200 Y 0.01000 280-125979-1 4 O90708 Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.32000 Y 0.01000 280-126229-1 4 O90712 Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06800 Y 0.01000 280-126229-1 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00492 Y 0.01136 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00091 Y 0.00120 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01215 Y 0.00481 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03812 Y 0.01168 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00035 Y 0.00346 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00798 Y 0.02348 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.00771 Y 0.00936 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02806 Y 0.00481 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00773 Y 0.00925 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01155 Y 0.00815 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01135 Y 0.00703 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.02213 Y 0.01055 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00215 Y 0.00521 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.01210 Y 0.00729 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00268 Y 0.00204 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00048 Y 0.00619 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00183 Y 0.01075 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00302 Y 0.00729 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00554 Y 0.00665 4 O90503.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00171 Y 0.00115 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.02926 Y 0.01136 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00109 Y 0.00120 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.02522 Y 0.00481 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.14104 Y 0.01168 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00028 Y 0.00346 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.01249 Y 0.02348 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.42711 Y 0.00936 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.04330 Y 0.00481 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.01617 Y 0.00925 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01226 Y 0.00815 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01229 Y 0.00703 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.02079 Y 0.01632 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.02767 Y 0.01055 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00780 Y 0.00521 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.03906 Y 0.00729 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00473 Y 0.00204 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00054 Y 0.006194O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00138 Y 0.01075 Page 7 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00949 Y 0.00729 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00961 Y 0.00665 4 O90507.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00281 Y 0.00115 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00701 Y 0.01136 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00088 Y 0.00120 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01036 Y 0.00481 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.17133 Y 0.01168 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00028 Y 0.00346 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00521 Y 0.02348 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01767 Y 0.00936 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02595 Y 0.00481 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00570 Y 0.00925 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00443 Y 0.00815 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00301 Y 0.00703 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.05074 Y 0.01632 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.02653 Y 0.01055 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00807 Y 0.00521 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.01955 Y 0.00729 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00369 Y 0.00204 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00060 Y 0.00619 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00092 Y 0.01075 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.01607 Y 0.00729 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00525 Y 0.00665 4 O90509.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00485 Y 0.00115 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01027 Y 0.01136 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00094 Y 0.00120 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01183 Y 0.00481 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04667 Y 0.01168 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00023 Y 0.00346 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00576 Y 0.02348 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.02445 Y 0.00936 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.03233 Y 0.00481 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00581 Y 0.00925 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00541 Y 0.00815 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00382 Y 0.00703 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.02563 Y 0.01055 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00398 Y 0.00521 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.01643 Y 0.00729 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00141 Y 0.00204 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00044 Y 0.00619 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00064 Y 0.01075 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.03676 Y 0.00729 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00433 Y 0.00665 4 O90514.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00221 Y 0.00115 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00782 Y 0.01136 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00073 Y 0.00120 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01538 Y 0.00481 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04658 Y 0.01168 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00487 Y 0.02348 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.00588 Y 0.00936 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.03903 Y 0.00481 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.01745 Y 0.009254O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01569 Y 0.00815 Page 8 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01703 Y 0.00703 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.03194 Y 0.01055 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00096 Y 0.00521 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.01319 Y 0.00729 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00154 Y 0.00204 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00619 N 0.00619 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00137 Y 0.01075 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00237 Y 0.00729 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00204 Y 0.00665 4 O90517.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00166 Y 0.00115 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01014 Y 0.01136 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00096 Y 0.00120 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01287 Y 0.00481 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04363 Y 0.01168 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 Y 0.00346 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00315 Y 0.02348 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01787 Y 0.00936 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.03188 Y 0.00481 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00756 Y 0.00925 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00784 Y 0.00815 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00580 Y 0.00703 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.02336 Y 0.01632 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01631 Y 0.01055 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00126 Y 0.00521 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.01907 Y 0.00729 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00175 Y 0.00204 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00619 N 0.00619 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00091 Y 0.01075 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00364 Y 0.00729 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00183 Y 0.00665 4 O90521.d Onsite-Lab Outfall 002 5/21/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00183 Y 0.00115 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.04117 Y 0.01136 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00099 Y 0.00120 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01345 Y 0.00481 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03283 Y 0.01168 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 Y 0.00346 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.00893 Y 0.00936 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.32383 Y 0.00481 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.13017 Y 0.00925 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.06571 Y 0.00815 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.02014 Y 0.00703 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.06665 Y 0.01632 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.46102 Y 0.01055 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00174 Y 0.00521 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.04693 Y 0.00729 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00541 Y 0.00204 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00007 Y 0.00619 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00081 Y 0.01075 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00451 Y 0.00729 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.01186 Y 0.00665 4 O90524.d Onsite-Lab Outfall 002 5/24/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00206 Y 0.00115 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.13190 Y 0.011364O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00090 Y 0.00120 Page 9 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.02723 Y 0.00481 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.05115 Y 0.01168 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00006 Y 0.00346 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00725 Y 0.02348 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01847 Y 0.00936 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.90548 Y 0.00481 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.37753 Y 0.00925 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.21774 Y 0.00815 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.08791 Y 0.00703 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.19608 Y 0.01632 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 1.30581 Y 0.01055 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00648 Y 0.00521 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.17692 Y 0.00729 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.01684 Y 0.00204 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00026 Y 0.00619 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00054 Y 0.01075 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.01783 Y 0.00729 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.06386 Y 0.00665 4 O90528.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00468 Y 0.00115 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.07938 Y 0.01136 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00076 Y 0.00120 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01617 Y 0.00481 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03732 Y 0.01168 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 Y 0.00346 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00420 Y 0.02348 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01820 Y 0.00936 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.39842 Y 0.00481 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.19131 Y 0.00925 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.12740 Y 0.00815 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.06211 Y 0.00703 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.08853 Y 0.01632 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.52438 Y 0.01055 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00635 Y 0.00521 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.13270 Y 0.00729 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00957 Y 0.00204 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00619 N 0.00619 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00064 Y 0.01075 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.01767 Y 0.00729 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.07475 Y 0.00665 4 O90531.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00367 Y 0.00115 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.06789 Y 0.01136 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00081 Y 0.00120 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.02439 Y 0.00481 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.16473 Y 0.01168 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00008 Y 0.00346 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00909 Y 0.02348 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.32104 Y 0.00936 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.21141 Y 0.00481 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.09458 Y 0.00925 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.07933 Y 0.00815 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.05027 Y 0.00703 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.06669 Y 0.01632 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.24148 Y 0.01055 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.01682 Y 0.005214O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.15901 Y 0.00729 Page 10 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00795 Y 0.00204 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00024 Y 0.00619 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00159 Y 0.01075 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.02568 Y 0.00729 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.05853 Y 0.00665 4 O90604.d Onsite-Lab Outfall 002 6/4/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00458 Y 0.00115 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.03399 Y 0.01136 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00103 Y 0.00120 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01474 Y 0.00481 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06911 Y 0.01168 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00466 Y 0.02348 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.06998 Y 0.00936 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.12436 Y 0.00481 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.05139 Y 0.00925 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.04905 Y 0.00815 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.04487 Y 0.00703 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.00326 Y 0.01632 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.11977 Y 0.01055 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00779 Y 0.00521 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.12631 Y 0.00729 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00677 Y 0.00204 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00619 N 0.00619 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00119 Y 0.01075 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.01750 Y 0.00729 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.05674 Y 0.00665 4 O90607.d Onsite-Lab Outfall 002 6/7/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00329 Y 0.00115 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01727 Y 0.01136 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00058 Y 0.00120 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00597 Y 0.00481 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06227 Y 0.01168 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00926 Y 0.02348 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.03956 Y 0.00936 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.04386 Y 0.00481 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.02026 Y 0.00925 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.02288 Y 0.00815 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.03547 Y 0.00703 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.37986 Y 0.01632 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.07790 Y 0.01055 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.01267 Y 0.00521 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.11140 Y 0.00729 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00326 Y 0.00204 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00094 Y 0.00619 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00007 Y 0.01075 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.01409 Y 0.00729 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.09535 Y 0.00665 4 O90614.d Onsite-Lab Outfall 002 6/14/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00350 Y 0.00115 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01077 Y 0.01136 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00060 Y 0.00120 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.01439 Y 0.01168 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.023484O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.00883 Y 0.00936 Page 11 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02762 Y 0.00481 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00994 Y 0.00925 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01098 Y 0.00815 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.02102 Y 0.00703 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01082 Y 0.01055 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00191 Y 0.00521 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.07616 Y 0.00729 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00058 Y 0.00204 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00061 Y 0.00619 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00031 Y 0.01075 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00039 Y 0.00729 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.01185 Y 0.00665 4 O90618.d Onsite-Lab Outfall 002 6/18/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00298 Y 0.00115 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00836 Y 0.01136 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00058 Y 0.00120 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.01883 Y 0.01168 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01240 Y 0.00936 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02365 Y 0.00481 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00827 Y 0.00925 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00709 Y 0.00815 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01661 Y 0.00703 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.07908 Y 0.01632 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01000 Y 0.01055 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00289 Y 0.00521 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.07029 Y 0.00729 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00039 Y 0.00204 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00071 Y 0.00619 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.01075 N 0.01075 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00211 Y 0.00729 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.01152 Y 0.00665 4 O90620.d Onsite-Lab Outfall 002 6/20/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00291 Y 0.00115 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01131 Y 0.01136 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00057 Y 0.00120 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.03321 Y 0.01168 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.04251 Y 0.00936 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02653 Y 0.00481 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00954 Y 0.00925 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01040 Y 0.00815 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01570 Y 0.00703 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.00181 Y 0.01055 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00491 Y 0.00521 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.08031 Y 0.00729 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00174 Y 0.00204 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00060 Y 0.00619 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00023 Y 0.01075 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00729 N 0.007294O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.01138 Y 0.00665 Page 12 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90625.d Onsite-Lab Outfall 002 6/25/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00254 Y 0.00115 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00965 Y 0.01136 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00061 Y 0.00120 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.01337 Y 0.01168 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.07597 Y 0.00936 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.01675 Y 0.00481 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00545 Y 0.00925 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00815 N 0.00815 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01156 Y 0.00703 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.01632 N 0.01632 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.00580 Y 0.01055 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00502 Y 0.00521 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.07592 Y 0.00729 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00047 Y 0.00204 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00063 Y 0.00619 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.01075 N 0.01075 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00031 Y 0.00729 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00968 Y 0.00665 4 O90628.d Onsite-Lab Outfall 002 6/28/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00236 Y 0.00115 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00137 Y 0.01136 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00054 Y 0.00120 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.02300 Y 0.01168 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01027 Y 0.00936 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02970 Y 0.00481 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00889 Y 0.00925 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00938 Y 0.00815 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01686 Y 0.00703 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.03549 Y 0.01632 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01161 Y 0.01055 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00290 Y 0.00521 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.06679 Y 0.00729 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00087 Y 0.00204 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00075 Y 0.00619 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00011 Y 0.01075 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00729 N 0.00729 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00835 Y 0.00665 4 O90701.d Onsite-Lab Outfall 002 7/1/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00261 Y 0.00115 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.01322 Y 0.01136 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00058 Y 0.00120 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.02203 Y 0.01168 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.02986 Y 0.00936 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02814 Y 0.00481 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00646 Y 0.00925 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00691 Y 0.00815 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00752 Y 0.007034O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.02734 Y 0.01632 Page 13 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.00682 Y 0.01055 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00766 Y 0.00521 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.06523 Y 0.00729 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00060 Y 0.00204 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00068 Y 0.00619 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00007 Y 0.01075 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00154 Y 0.00729 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00917 Y 0.00665 4 O90703.d Onsite-Lab Outfall 002 7/3/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00204 Y 0.00115 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.03117 Y 0.01136 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00057 Y 0.00120 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.01288 Y 0.00481 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.25504 Y 0.01168 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.00102 Y 0.02348 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.08267 Y 0.00936 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.08130 Y 0.00481 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.02275 Y 0.00925 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.01411 Y 0.00815 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.01599 Y 0.00703 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.02674 Y 0.01632 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01486 Y 0.01055 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00023 Y 0.00521 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.11438 Y 0.00729 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00058 Y 0.00204 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00066 Y 0.00619 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.00091 Y 0.01075 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00563 Y 0.00729 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.01478 Y 0.00665 4 O90708.d Onsite-Lab Outfall 002 7/8/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00310 Y 0.00115 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00975 Y 0.01136 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00059 Y 0.00120 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.00481 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04042 Y 0.01168 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.02327 Y 0.00936 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.02695 Y 0.00481 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00548 Y 0.00925 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00708 Y 0.00815 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00627 Y 0.00703 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.07399 Y 0.01632 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.00323 Y 0.01055 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00372 Y 0.00521 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.06017 Y 0.00729 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00194 Y 0.00204 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00061 Y 0.00619 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.01075 N 0.01075 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00729 N 0.00729 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00681 Y 0.00665 4 O90712.d Onsite-Lab Outfall 002 7/12/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00227 Y 0.00115 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab NVHOS 1132933-86-8 0.00178 Y 0.01136 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PES 113507-82-7 0.00051 Y 0.00120 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PMPA 13140-29-9 0.00481 N 0.004814O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04631 Y 0.01168 Page 14 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFECA_B 151772-58-6 0.00346 N 0.00346 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PEPA 267239-61-2 0.02348 N 0.02348 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Byproduct 1 29311-67-9 0.01412 Y 0.00936 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFO2HxA 39492-88-1 0.01526 Y 0.00481 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFO3OA 39492-89-2 0.00260 Y 0.00925 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFO4DA 39492-90-5 0.00327 Y 0.00815 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFO5DA 39492-91-6 0.00558 Y 0.00703 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PPF Acid 422-64-0 0.00496 Y 0.01632 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.01055 N 0.01055 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab EVE-Acid 69087-46-3 0.00365 Y 0.00521 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Byproduct 2 749836-20-2 0.04769 Y 0.00729 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Hydro-EVE Acid 773804-62-9 0.00039 Y 0.00204 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab PFECA_G 801212-59-9 0.00071 Y 0.00619 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab R-EVE EVS1428 0.01075 N 0.01075 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Byproduct 4 EVS1429 0.00064 Y 0.00729 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Byproduct 5 EVS1430 0.00754 Y 0.00665 4 O90716.d Onsite-Lab Outfall 002 7/16/2019 Preliminary data from Onsite Lab Byproduct 6 EVS1431 0.00131 Y 0.00115 4 O90716.d Onsite-Lab Outfall 002 1/3/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.19000 Y 4 O90716.d Onsite-Lab Outfall 002 1/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.34000 Y 4 O90716.d Onsite-Lab Outfall 002 1/10/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.11000 Y 4 O90716.d Onsite-Lab Outfall 002 1/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.24000 Y 4 O90716.d Onsite-Lab Outfall 002 1/17/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.09200 Y 4 O90716.d Onsite-Lab Outfall 002 1/22/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.19000 Y 4 O90716.d Onsite-Lab Outfall 002 1/25/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.34000 Y 4 O90716.d Onsite-Lab Outfall 002 1/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.08500 Y 4 O90716.d Onsite-Lab Outfall 002 2/1/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.08800 Y 4 O90716.d Onsite-Lab Outfall 002 2/4/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.09100 Y 4 O90716.d Onsite-Lab Outfall 002 2/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.08800 Y 4 O90716.d Onsite-Lab Outfall 002 2/11/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.09000 Y 4 O90716.d Onsite-Lab Outfall 002 2/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.24000 Y 4 O90716.d Onsite-Lab Outfall 002 2/18/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.15000 Y 4 O90716.d Onsite-Lab Outfall 002 2/25/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.35000 Y 4 O90716.d Onsite-Lab Outfall 002 2/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.05400 Y 4 O90716.d Onsite-Lab Outfall 002 3/4/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.29000 Y 4 O90716.d Onsite-Lab Outfall 002 3/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06200 Y 4 O90716.d Onsite-Lab Outfall 002 3/11/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.11000 Y 4 O90716.d Onsite-Lab Outfall 002 3/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04900 Y 4 O90716.d Onsite-Lab Outfall 002 3/18/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.12000 Y 4 O90716.d Onsite-Lab Outfall 002 3/21/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.07200 Y 4 O90716.d Onsite-Lab Outfall 002 3/25/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.08700 Y 4 O90716.d Onsite-Lab Outfall 002 3/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.11000 Y 4 O90716.d Onsite-Lab Outfall 002 4/1/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06800 Y 4 O90716.d Onsite-Lab Outfall 002 4/5/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.35000 Y 4 O90716.d Onsite-Lab Outfall 002 4/8/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04800 Y 4 O90716.d Onsite-Lab Outfall 002 4/9/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.24000 Y 4 O90716.d Onsite-Lab Outfall 002 4/12/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.07300 Y 4 O90716.d Onsite-Lab Outfall 002 4/16/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.14000 Y 4 O90716.d Onsite-Lab Outfall 002 4/18/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04800 Y 4 O90716.d Onsite-Lab Outfall 002 4/23/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.14000 Y 4 O90716.d Onsite-Lab Outfall 002 4/24/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06200 Y 4 O90716.d Onsite-Lab Outfall 002 4/26/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.05900 Y 4 O90716.d Onsite-Lab Outfall 002 4/30/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.05800 Y 4 O90716.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.05600 Y 4 O90716.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.19000 Y4O90716.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.29000 Y Page 15 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 O90716.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.08300 Y 4 O90716.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.04700 Y 4 O90716.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.07600 Y 4 O90716.d Onsite-Lab Outfall 002 5/30/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.09950 Y 4 O90716.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab HFPO-DA 13252-13-6 0.06800 Y 4 O90716.d Onsite-Lab Outfall 002 1/28/2019 Preliminary data from Onsite Lab PFOA 335-67-1 0.08500 Y 4 O90716.d Onsite-Lab Outfall 002 2/18/2019 Preliminary data from Onsite Lab PFOA 335-67-1 0.15000 Y 4 O90716.d Onsite-Lab Outfall 002 2/4/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/7/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/11/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/14/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/18/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/25/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 2/28/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/4/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 1.30000 Y 4 O90716.d Onsite-Lab Outfall 002 3/7/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.72000 Y 4 O90716.d Onsite-Lab Outfall 002 3/11/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/14/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/18/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/21/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/25/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 3/28/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/1/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/5/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/8/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/9/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/12/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/16/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/18/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/23/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.12000 Y 4 O90716.d Onsite-Lab Outfall 002 4/24/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 4/26/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.07000 Y 4 O90716.d Onsite-Lab Outfall 002 4/30/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/3/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/7/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/9/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/14/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/17/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/20/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 0.21000 N 4 O90716.d Onsite-Lab Outfall 002 5/28/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 5.50000 Y 4 O90716.d Onsite-Lab Outfall 002 5/30/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 2.55000 Y 4 O90716.d Onsite-Lab Outfall 002 5/31/2019 Preliminary data from Onsite Lab PFMOAA 674-13-5 2.10000 Y 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.57000 U N 0.57 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.05400 U N 0.054 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U N 0.015 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,F1 UJ N 0.035 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U N 0.027 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.08100 U N 0.081 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05800 U N 0.058 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.07900 U N 0.079 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.03400 U N 0.034 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,F1 UJ N 0.037 280-124212-14DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.21000 U N 0.21 280-124212-1 Page 16 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.03000 U N 0.030 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U N 0.024 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.04700 U N 0.047 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U N 0.028 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U N 0.070 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.16000 U N 0.16 280-124212-1 4 DSTW-OUTFALL 002-052019 TAL-SAC Outfall 002 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.05800 U N 0.058 280-124212-14FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.10000 H Y 0.054 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.64000 H Y 0.57 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP Hfpo Dimer Acid 13252-13-6 0.11000 H Y 0.086 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.64000 H Y 0.081 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.14000 H Y 0.034 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.22000 H Y 0.079 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.32000 H Y 0.058 280-124597-14FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.19000 H Y 0.030 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.024 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 2.50000 H Y 0.21 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U,H N 0.028 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.04700 U,H N 0.047 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.03000 H Y 0.027 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U,H N 0.015 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 1.30000 H,F1 J Y 0.058 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.23000 H Y 0.16 280-124597-14FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U,H N 0.070 280-124597-1 4 FAY-DSTW-OUTFALL002-053019 TAL-SAC Outfall 002 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124597-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.01200 U,H N 0.0060 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00000 Y 0.0040 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00000 U,H N 0.057 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00000 H Y 0.0054 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified PFOA 335-67-1 0.00000 U,H N 0.0046 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00000 H Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00000 U N 0.020 280-124971-14WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00000 U N 0.020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00000 H Y 0.0027 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00000 U,H,*N 0.0035 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00000 Y 0.0020 280-124971-14WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.00000 U N 0.0020 280-124971-1 Page 17 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00000 H,*J Y 0.0034 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified PFOS 1763-23-1 0.00000 H Y 0.0081 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00000 H Y 0.0058 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00000 H Y 0.0079 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00000 U N 0.020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.09700 U,H,*N 0.0037 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.55440 U N 0.0020 280-124971-14WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00400 H Y 0.021 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00280 H Y 0.0030 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00450 H Y 0.0024 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00000 U N 0.020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.03370 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.00000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00000 U,H N 0.020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00000 U N 0.020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00000 U,H N 0.011 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.01400 U,H N 0.0060 280-124971-14WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.21000 Y 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.48000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.09000 U N 0.0020 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05130 H Y 0.0028 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.04600 U,H N 0.0041 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.06100 H Y 0.0070 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.00000 H Y 0.016 280-124971-1 4 WSTW-OUTFALL 002-060719 TAL-SAC Outfall 002 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.01300 H Y 0.0058 280-124971-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 22.00000 H,F1 J Y 17 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Hfpo Dimer Acid 13252-13-6 24.00000 Y 0.13 320-44881-15PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 4.50000 U,H N 4.5 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified PFOS 1763-23-1 0.01200 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 3.30000 U,H N 3.3 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 20.00000 U,H UJ N 20 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluoropentanoic Acid 2706-90-3 0.47000 Y 0.043 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 23.00000 U,H UJ N 23 320-44881-35PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorohexanoic Acid 307-24-4 0.02600 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 10.00000 U,H,*,F1 UJ N 10 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified PFOA 335-67-1 0.03400 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00540 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorobutanoic Acid 375-22-4 0.19000 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00220 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluoroheptanoic Acid 375-85-9 0.05000 Y 0.0020 320-44881-15PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 320-44881-1 Page 18 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorononanoic Acid 375-95-1 0.00210 Y 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 35.00000 H,F1 J Y 18 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 18.00000 U,H UJ N 18 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 19.00000 U,H UJ N 19 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 21.00000 U,H UJ N 21 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 16.00000 U,H,*UJ N 16 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 59.00000 H Y 19 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00200 U N 0.0020 320-44881-15PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified F-53B Major 73606-19-6 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 19.00000 U,H UJ N 19 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U,F1 N 0.020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 19.00000 U,H UJ N 19 320-44881-3 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified F-53B Minor 83329-89-9 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified ADONA 958445-44-8 0.00210 U N 0.0021 320-44881-1 5 PF1018-LTW-01 TAL-SAC LTW-01 10/31/2018 537 Modified NaDONA EVS1361 0.00210 U N 0.0021 320-44881-15PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 8.40000 U,H,F1 N 8.4 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Hfpo Dimer Acid 13252-13-6 8.30000 Y 0.12 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 2.30000 U,H N 2.3 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 1.70000 U,H N 1.7 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 10.00000 U,H N 10 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluoropentanoic Acid 2706-90-3 0.25000 Y 0.0020 19657805PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 12.00000 U,H UJ N 12 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorohexanoic Acid 307-24-4 0.00860 Y 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 5.20000 U,H,F1,*UJ N 5.2 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified PFOA 335-67-1 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 19657805PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorobutanoic Acid 375-22-4 0.06700 Y 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluoroheptanoic Acid 375-85-9 0.01200 Y 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 15.00000 H Y 9.2 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 8.80000 U,H,F1 N 8.8 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 9.70000 U,H N 9.7 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 11.00000 U,H UJ N 11 320-41147-15PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 8.20000 U,H,F1,*UJ N 8.2 1965780 Page 19 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 44.00000 H Y 9.5 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00200 U N 0.0020 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified F-53B Major 73606-19-6 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 9.50000 U,H,F1 UJ N 9.5 320-41147-1 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 9.60000 U,H N 9.6 320-41147-15PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified F-53B Minor 83329-89-9 0.00200 U N 0.0020 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified ADONA 958445-44-8 0.00210 U N 0.0021 1965780 5 PF1018-LTW-02 TAL-SAC LTW-02 10/31/2018 537 Modified NaDONA EVS1361 0.00210 U N 0.0021 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.10:2 Fluorotelomer sulfonate 120226-60-0 0.00830 U N 0.0083 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 10.00000 Y 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 SW8321B Hfpo Dimer Acid 13252-13-6 8.50000 Z J Y 0.092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorooctadecanoic acid 16517-11-6 0.00180 U N 0.0018 320-45387-2 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00280 U N 0.0028 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.PFOS 1763-23-1 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluoroundecanoic Acid 2058-94-8 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00280 U N 0.0028 320-45387-25GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00280 U N 0.0028 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 2.70000 Y 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluoropentanoic Acid 2706-90-3 0.58000 Y 0.055 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.6:2 Fluorotelomer sulfonate 27619-97-2 0.00180 U N 0.0018 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 1.20000 U N 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00280 U N 0.0028 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorohexanoic Acid 307-24-4 0.01200 Y 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorododecanoic Acid 307-55-1 0.00180 U N 0.0018 320-45387-2 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00830 U N 0.0083 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.PFOA 335-67-1 0.00092 U N 0.00092 320-45387-15GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorodecanoic Acid 335-76-2 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorodecane Sulfonic Acid 335-77-3 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorohexane Sulfonic Acid 355-46-4 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorobutanoic Acid 375-22-4 0.13000 Y 0.0055 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorobutane Sulfonic Acid 375-73-5 0.00092 U N 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluoroheptanoic Acid 375-85-9 0.01500 Y 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorononanoic Acid 375-95-1 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorotetradecanoic Acid 376-06-7 0.00092 U N 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00550 U N 0.0055 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 37.00000 F1 J Y 2.0 320-45387-25GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 5.60000 Y 2.0 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.97000 U N 2.0 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 1.10000 U N 2.0 320-45387-2 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00830 U UJ N 0.0083 320-45387-2 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorononanesulfonate 474511-07-4 0.00180 U N 0.0018 320-45387-1 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 151.00000 Y 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00092 U N 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorotridecanoic Acid 72629-94-8 0.00092 U N 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 SW8321B F-53B Major 73606-19-6 0.00092 U UJ N 0.00092 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.95000 U N 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorooctane Sulfonamide 754-91-6 0.00280 U N 0.0028 320-45387-15GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00280 U N 0.0028 320-45387-1 Page 20 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 537 Rev. 1.1 MOD.Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00092 U N 0.00092 320-45387-2 5 GW0718-LTW-03 TAL-SAC LTW-03 7/13/2018 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.96000 U N 2.0 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 SW8321B F-53B Minor 83329-89-9 0.00092 UZ UJ N 0.00092 320-45387-1 5 GW0718-LTW-03 LANC LTW-03 7/13/2018 SW8321B NaDONA EVS1361 0.00092 U UJ N 0.00092 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 42.00000 U,H N 42 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Hfpo Dimer Acid 13252-13-6 18.00000 Y 0.14 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 11.00000 U,H,*UJ N 11 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 320-45387-15PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 8.30000 U,H N 8.3 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 50.00000 U,H N 50 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluoropentanoic Acid 2706-90-3 1.60000 Y 0.047 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 58.00000 U,H N 58 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorohexanoic Acid 307-24-4 0.03700 Y 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 320-45387-15PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 26.00000 U,H,*UJ N 26 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified PFOA 335-67-1 0.00600 Y 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorobutanoic Acid 375-22-4 0.37000 Y 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluoroheptanoic Acid 375-85-9 0.06500 Y 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 320-45387-15PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 46.00000 U,H N 46 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 44.00000 U,H N 44 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 49.00000 U,H N 49 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 53.00000 U,H N 53 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 41.00000 U,H,*UJ N 41 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 99.00000 H Y 47 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified F-53B Major 73606-19-6 0.00200 U N 0.0020 320-45387-15PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 47.00000 U,H N 47 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 48.00000 U,H N 48 320-45387-2 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified F-53B Minor 83329-89-9 0.00200 U N 0.0020 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified ADONA 958445-44-8 0.00210 U N 0.0021 320-45387-1 5 PF1018-LTW-04 TAL-SAC LTW-04 11/12/2018 537 Modified NaDONA EVS1361 0.00210 U N 0.0021 320-45387-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 84.00000 U,H N 84 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Hfpo Dimer Acid 13252-13-6 33.00000 Y 0.13 320-44881-15PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 320-44881-1 Page 21 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 23.00000 U,H N 23 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 17.00000 U,H N 17 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 100.00000 U,H N 100 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluoropentanoic Acid 2706-90-3 3.10000 Y 0.044 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 120.00000 U,H N 120 320-44881-35PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorohexanoic Acid 307-24-4 0.12000 Y 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 52.00000 U,H N 52 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified PFOA 335-67-1 0.00330 Y 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorobutanoic Acid 375-22-4 0.40000 Y 0.031 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluoroheptanoic Acid 375-85-9 0.28000 Y 0.0020 320-44881-15PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 92.00000 U,H N 92 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 88.00000 U,H N 88 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 97.00000 U,H N 97 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 110.00000 U,H N 110 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 82.00000 U,H,*UJ N 82 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 262.00000 H Y 95 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00200 U N 0.0020 320-44881-15PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified F-53B Major 73606-19-6 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 95.00000 U,H N 95 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 96.00000 U,H N 96 320-44881-3 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified F-53B Minor 83329-89-9 0.00200 U N 0.0020 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified ADONA 958445-44-8 0.00210 U N 0.0021 320-44881-1 5 PF1018-LTW-05 TAL-SAC LTW-05 11/12/2018 537 Modified NaDONA EVS1361 0.00210 U N 0.0021 320-44881-16FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 320-51045-1 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.98000 H Y 0.054 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 10.00000 J Y 0.17 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 19.00000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 25.00000 H Y 0.57 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 320-51045-1 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.04700 H Y 0.015 320-51045-16FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.02000 Y 0.0017 2028553 Page 22 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00085 U N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.09400 Y 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.00290 Y 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.26000 Y 0.0051 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00140 Y 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.03500 Y 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00760 U UJ N 0.0076 20285536FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.03900 Y 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00510 U N 0.0051 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 6.80000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 8.10000 H Y 0.079 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 6.30000 Y 0.10 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 5.60000 H Y 0.034 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 12.00000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 14.00000 H Y 0.058 320-51045-16FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 35.00000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 41.00000 H Y 0.081 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00760 U UJ N 0.0076 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00085 U UJ N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00085 U N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.96000 H Y 0.024 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.20000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.20000 H Y 0.030 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00085 U N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.00170 U N 0.0017 20285536FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 62.00000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 84.00000 H Y 0.21 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.00630 Y 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00250 U N 0.0025 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 0.52000 Y 0.051 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00170 U N 0.0017 20285536FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.00170 U N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 7.10000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 9.90000 H Y 0.047 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 4.30000 Y 0.050 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 4.00000 H Y 0.027 320-51045-1 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 23.00000 H Y 0.058 320-51045-1 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 2.20000 H Y 0.16 320-51045-1 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.20000 H Y 0.070 320-51045-1 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.00170 U UJ N 0.0017 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00085 U UJ N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 20285536FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 320-51045-1 Page 23 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 6 FAY-SW-SEEP-A-1-020719 LANC SEEP-A-1 2/7/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00085 U N 0.00085 2028553 6 FAY-SW-SEEP-A-1-020719 TAL-SAC SEEP-A-1 2/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.70000 H Y 0.028 320-51045-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 25.00000 F1 J Y 0.57 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 24.00000 J Y 0.57 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 1.40000 Y 0.054 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 1.40000 Y 0.054 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 47.00000 Y 0.081 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 48.00000 Y 0.081 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U UJ N 0.035 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOA 335-67-1 0.03700 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOA 335-67-1 0.03900 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00330 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00330 Y 0.0020 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.36000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.36000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.12000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.12000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.02600 Y 0.0020 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.02800 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U UJ N 0.037 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,F1 UJ N 0.037 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 18.00000 Y 0.058 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 18.00000 Y 0.058 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 6.20000 Y 0.034 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 7.10000 Y 0.034 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 11.00000 Y 0.079 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 11.00000 Y 0.079 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124212-1 Page 24 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.50000 Y 0.028 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.50000 Y 0.028 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 103.00000 Y 0.21 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 103.00000 F1 J Y 0.21 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 1.70000 Y 0.024 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 1.60000 Y 0.024 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.70000 Y 0.030 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.80000 Y 0.030 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 7.40000 Y 0.027 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 7.40000 Y 0.027 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 11.00000 Y 0.047 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 11.00000 Y 0.047 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.69000 Y 0.0023 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.75000 Y 0.0024 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOS 1763-23-1 0.00550 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOS 1763-23-1 0.00570 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.60000 Y 0.070 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.60000 Y 0.070 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 3.00000 Y 0.16 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 3.00000 Y 0.16 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 32.00000 Y 0.058 280-124212-1 6 FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 31.00000 Y 0.058 280-124212-16FAY-SW-SEEPA-1-052019 TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.06700 Y 0.015 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.07400 Y 0.015 280-124212-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 1.00000 H Y 0.054 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 20.00000 E Y 0.014 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 17.00000 H Y 0.57 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.05000 H Y 0.015 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.01500 Y 0.0020 280-124971-16FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 Page 25 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.07900 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.24000 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00400 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00220 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified PFOA 335-67-1 0.03600 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H,*N 0.035 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-16FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 5.30000 H Y 0.079 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 4.60000 H,*J Y 0.034 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 11.00000 H Y 0.058 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 30.00000 H Y 0.081 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H,*N 0.037 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.97000 H Y 0.024 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.30000 H Y 0.030 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-16FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 72.00000 H Y 0.21 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified PFOS 1763-23-1 0.00970 Y 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.49000 Y 0.0045 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-16FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 6.90000 H Y 0.047 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 5.30000 H Y 0.027 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 18.00000 H Y 0.058 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 1.70000 H Y 0.16 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.10000 H Y 0.070 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.40000 H Y 0.028 280-124971-1 6 FAY-SW-SEEP A-1-060719 TAL-SAC SEEP-A-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124971-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 1.40000 Y 0.054 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 25.00000 F1 J Y 0.57 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOS 1763-23-1 0.00550 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 11.00000 Y 0.047 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.75000 Y 0.0024 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124212-1 Page 26 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 7.40000 Y 0.027 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified PFOA 335-67-1 0.03700 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00330 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.36000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.12000 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.02600 Y 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 48.00000 Y 0.081 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 18.00000 Y 0.058 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 11.00000 Y 0.079 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 6.20000 Y 0.034 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,F1 UJ N 0.037 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 103.00000 Y 0.21 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 1.70000 Y 0.024 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.70000 Y 0.030 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.50000 Y 0.028 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Hfpo Dimer Acid (trial)EVS1200 38.00000 Y 0.086 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.60000 Y 0.070 280-124212-16FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 3.00000 Y 0.16 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 32.00000 Y 0.058 280-124212-1 6 FAY-SW-SEEPA-1-052019-D TAL-SAC SEEP-A-1 5/20/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.07400 Y 0.015 280-124212-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 38.00000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 42.00000 H Y 0.57 320-51045-1 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 24.00000 J Y 1.8 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 3.30000 H Y 0.054 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 320-51045-17FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.08400 H Y 0.015 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.05400 U N 0.054 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.56000 Y 0.054 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.17000 Y 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.01800 Y 0.018 20281257FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.04700 Y 0.018 2028125 Page 27 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.03100 Y 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.08100 U N 0.081 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 43.00000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 43.00000 H Y 0.081 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 11.00000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 9.20000 H Y 0.058 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 2.00000 Y 0.050 20281257FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.80000 H Y 0.079 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.46000 Y 0.10 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.53000 H Y 0.034 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.08100 U N 0.081 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 150.00000 Y 0.50 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 148.00000 H Y 0.21 320-51045-17FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.10000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 1.10000 H Y 0.030 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 6.10000 H Y 0.024 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 1.60000 Y 0.054 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 15.00000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 17.00000 H Y 0.047 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.01800 U N 0.018 20281257FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.02700 U N 0.027 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 4.60000 Y 0.050 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 3.50000 H Y 0.027 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.80000 H Y 0.028 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 20281257FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 320-51045-1 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00900 U N 0.009 2028125 7 FAY-SW-SEEP-B-1-020519 LANC SEEP-B-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.01800 U N 0.018 2028125 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 3.20000 H Y 0.070 320-51045-1 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 4.70000 H Y 0.16 320-51045-1 7 FAY-SW-SEEP-B-1-020519 TAL-SAC SEEP-B-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 38.00000 H,*Y 0.058 320-51045-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 2.70000 Y 0.054 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 34.00000 Y 0.57 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124257-1 Page 28 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.05300 Y 0.015 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified PFOA 335-67-1 0.01700 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.01200 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.14000 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.47000 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00220 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U N 0.037 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.21000 Y 0.034 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.30000 Y 0.079 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 9.60000 Y 0.058 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 43.00000 Y 0.081 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 2.90000 Y 0.024 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.66000 Y 0.030 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 150.00000 Y 0.21 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 2.00000 Y 0.027 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified PFOS 1763-23-1 0.00230 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 13.00000 Y 0.047 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 1.20000 Y 0.0023 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 21.00000 F1 J Y 0.058 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 2.90000 Y 0.16 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 2.00000 Y 0.070 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.70000 Y 0.028 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124257-17FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 35.00000 H Y 0.57 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 27.00000 E Y 0.014 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 3.20000 H Y 0.054 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.07800 H Y 0.015 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00260 Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-17FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124971-1 Page 29 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.60000 Y 0.0033 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00220 Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.17000 Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.01600 Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified PFOA 335-67-1 0.02400 Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 280-124971-17FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 39.00000 H Y 0.081 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 8.80000 H Y 0.058 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.50000 H Y 0.079 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.27000 H Y 0.034 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 157.00000 H Y 0.21 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.94000 H Y 0.030 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-17FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 4.30000 H Y 0.024 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 1.50000 Y 0.0046 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 15.00000 H Y 0.047 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified PFOS 1763-23-1 0.00220 I Y 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 2.90000 H Y 0.027 280-124971-17FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.20000 H Y 0.028 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 3.20000 H Y 0.070 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 3.90000 H Y 0.16 280-124971-1 7 FAY-SW-SEEP B-1-060719 TAL-SAC SEEP-B-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 34.00000 H Y 0.058 280-124971-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 2.00000 Y 0.027 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified PFOA 335-67-1 0.01700 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00220 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.47000 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.14000 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.01200 Y 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124257-1 Page 30 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 43.00000 Y 0.081 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 9.60000 Y 0.058 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.30000 Y 0.079 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.21000 Y 0.034 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U N 0.037 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 150.00000 Y 0.21 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 2.90000 Y 0.024 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.66000 Y 0.030 280-124257-17FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.70000 Y 0.028 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Hfpo Dimer Acid (trial)EVS1200 25.00000 Y 0.086 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 2.00000 Y 0.070 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 2.90000 Y 0.16 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 21.00000 F1 J Y 0.058 280-124257-1 7 FAY-SW-SEEP-B-1-052119 TAL-SAC SEEP-B-1 5/21/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.05300 Y 0.015 280-124257-1 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.09200 U,H N 0.092 320-51045-18FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 2.00000 H Y 0.11 320-51045-1 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.12000 U,H N 0.12 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 27.00000 J Y 1.8 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 27.00000 J Y 1.7 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 16.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 15.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 16.00000 H Y 1.1 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.01700 U N 0.017 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.12000 U,H N 0.12 320-51045-1 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.03100 U,H N 0.031 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.08200 U N 0.082 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.07900 U N 0.079 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.06900 U,H N 0.069 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.02000 Y 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.01700 Y 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02600 U N 0.026 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.08100 Y 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.07900 Y 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.05400 U N 0.054 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.05200 U N 0.052 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.01800 U N 0.018 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.01700 U N 0.017 2028125 Page 31 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.22000 Y 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.22000 Y 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.38000 Y 0.054 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.38000 Y 0.052 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.01700 U N 0.017 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 62.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 62.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 64.00000 H Y 0.16 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.08200 U N 0.082 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.07900 U N 0.079 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.07500 U,H N 0.075 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.10000 U N 0.10 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.10000 U N 0.10 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.08900 H Y 0.067 320-51045-18FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 4.50000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 4.40000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 4.60000 H Y 0.16 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 21.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 22.00000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 20.00000 H Y 0.12 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.59000 J Y 0.050 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.50000 J Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.59000 H Y 0.061 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 200.00000 Y 0.50 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 200.00000 Y 0.50 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 196.00000 H Y 0.42 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.04900 U,H N 0.049 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.01800 U N 0.018 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.30000 H Y 0.056 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05000 U N 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05000 U N 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05300 U,H N 0.053 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.22000 U,H N 0.22 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.01800 U N 0.018 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.01700 U N 0.017 2028125 Page 32 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02700 U N 0.027 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02600 U N 0.026 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 4.70000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 4.70000 Y 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 5.10000 H Y 0.093 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 1.70000 Y 0.054 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 1.70000 Y 0.052 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.01800 U N 0.018 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 1.60000 H Y 0.32 320-51045-1 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 3.00000 H Y 0.12 320-51045-1 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.90000 H Y 0.14 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 2028125 8 FAY-SW-SEEP-C-1-020519 TAL-SAC SEEP-C-1 2/5/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.08200 U,H N 0.082 320-51045-1 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00870 U N 0.0087 20281258FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.01800 U N 0.018 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.01700 U N 0.017 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00910 U N 0.0091 2028125 8 FAY-SW-SEEP-C-1-020519 LANC SEEP-C-1 2/5/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00870 U N 0.0087 2028125 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.09000 U N 0.090 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 14.00000 Y 0.85 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Hfpo Dimer Acid 13252-13-6 36.00000 E Y 0.015 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.09000 U N 0.090 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 2.00000 Y 0.080 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124325-18FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.06900 U N 0.069 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 66.00000 Y 0.12 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00220 Y 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.39000 Y 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.24000 Y 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124325-18FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified PFOA 335-67-1 0.01800 Y 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.05200 U N 0.052 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 19.00000 Y 0.087 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 4.90000 Y 0.12 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.09700 Y 0.050 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.05600 U N 0.056 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.50000 Y 0.042 280-124325-18FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124325-1 Page 33 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.03600 U N 0.036 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 193.00000 Y 0.32 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.72000 Y 0.045 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 1.80000 Y 0.0048 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 5.00000 Y 0.070 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified PFOS 1763-23-1 0.00220 Y 0.0020 280-124325-18FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.16000 U N 0.16 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.04000 U N 0.040 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.06100 U N 0.061 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.20000 F1 Y 0.11 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 1.90000 F1 Y 0.087 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 1.30000 Y 0.24 280-124325-1 8 FAY-SW-SEEP-C-1-052319 TAL-SAC SEEP-C-1 5/23/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.05200 Y 0.023 280-124325-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.09200 U,H N 0.092 280-124971-18FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 2.10000 H Y 0.11 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.12000 U,H N 0.12 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 42.00000 E Y 0.016 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 13.00000 H Y 1.1 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.12000 U,H N 0.12 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.04000 H Y 0.031 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.06900 U,H,*N 0.069 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified PFOA 335-67-1 0.01600 Y 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-18FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.23000 Y 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.40000 Y 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00230 Y 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-18FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.07500 U,H,*N 0.075 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.06700 U,H,F1,*N 0.067 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 3.60000 H Y 0.16 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 17.00000 H Y 0.12 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 56.00000 H Y 0.16 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.04900 U,H N 0.049 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.66000 H,F1 Y 0.061 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 199.00000 H Y 0.42 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-18FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 Page 34 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05300 U,H N 0.053 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.22000 U,H N 0.22 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 4.00000 H Y 0.093 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 1.70000 Y 0.0051 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 1.50000 H Y 0.32 280-124971-18FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 3.10000 H Y 0.12 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.90000 H Y 0.14 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 2.10000 H Y 0.056 280-124971-1 8 FAY-SW-SEEP C-1-060719 TAL-SAC SEEP-C-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.08200 U,H N 0.082 280-124971-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.81000 H Y 0.054 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.80000 H Y 0.054 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Hfpo Dimer Acid 13252-13-6 19.00000 E Y 0.0071 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Hfpo Dimer Acid 13252-13-6 15.00000 E Y 0.0070 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 9.00000 H Y 0.57 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 9.20000 H Y 0.57 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 280-124599-19FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified PFOA 335-67-1 0.01200 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified PFOA 335-67-1 0.01100 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 I Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 I Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.21000 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.21000 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.09700 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.09300 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124599-1 Page 35 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00270 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00260 Y 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 29.00000 H Y 0.081 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 29.00000 H Y 0.081 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.15000 H Y 0.034 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.15000 H Y 0.034 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 2.50000 H Y 0.079 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 2.30000 H Y 0.079 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 7.90000 H Y 0.058 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 8.10000 H Y 0.058 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.32000 H Y 0.030 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.34000 H Y 0.030 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 91.00000 H Y 0.21 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 91.00000 H Y 0.21 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.024 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.024 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.30000 H Y 0.028 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.30000 H Y 0.028 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U,H N 0.027 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U,H N 0.027 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 2.90000 H Y 0.047 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 3.00000 H Y 0.047 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124599-19FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.73000 Y 0.0023 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.76000 Y 0.0023 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U,H N 0.015 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 H Y 0.015 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 2.60000 H Y 0.058 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 2.50000 H Y 0.058 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.10000 H Y 0.070 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.10000 H Y 0.070 280-124599-19FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 1.00000 H Y 0.16 280-124599-1 Page 36 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.97000 H Y 0.16 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124599-1 9 FAY-SW-SEEP-D-1-053019 TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP-D-1-053019-D TAL-SAC SEEP-D-1 5/30/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124599-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 7.20000 H Y 0.57 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 16.00000 E Y 0.014 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124971-19FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.90000 H Y 0.054 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01700 H Y 0.015 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00280 Y 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.10000 Y 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.21000 Y 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124971-19FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00210 Y 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified PFOA 335-67-1 0.01400 Y 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H,*N 0.035 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 7.40000 H Y 0.058 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 24.00000 H Y 0.081 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.80000 H Y 0.079 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.12000 H,*J Y 0.034 280-124971-19FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H,*N 0.037 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 90.00000 H Y 0.21 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.024 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.39000 H Y 0.030 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.79000 Y 0.0046 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-19FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 2.40000 H Y 0.047 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U,H N 0.027 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 1.20000 H Y 0.028 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 1.00000 H Y 0.070 280-124971-1 9 FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 2.20000 H Y 0.058 280-124971-19FAY-SW-SEEP D-1-060719 TAL-SAC SEEP-D-1 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.84000 H Y 0.16 280-124971-1 Page 37 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 5.90000 Y 0.18 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 5.80000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 6.00000 H Y 0.57 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.80000 H Y 0.054 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U,H N 0.015 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H N 0.035 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.82000 Y 0.10 202768910FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.95000 H J Y 0.034 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.80000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.60000 H Y 0.079 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 22.00000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 18.00000 H Y 0.081 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 6.40000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 5.20000 H Y 0.058 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H N 0.037 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.20000 H Y 0.028 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.33000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.34000 H Y 0.030 320-51031-110FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U,H N 0.024 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 83.00000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 92.00000 H Y 0.21 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 1.90000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 2.00000 H Y 0.047 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.18000 Y 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.14000 H Y 0.027 320-51031-1 10 FAY-SW-OLDOF-2-020119 LANC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 2027689 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.19000 H Y 0.070 320-51031-110FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.42000 H Y 0.16 320-51031-1 10 FAY-SW-OLDOF-2-020119 TAL-SAC OLDOF-2 2/1/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 1.30000 H Y 0.058 320-51031-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.83000 Y 0.054 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 5.60000 Y 0.57 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U N 0.015 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124472-110FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified PFOA 335-67-1 0.03200 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.08600 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.02500 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124472-110FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124472-1 Page 38 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00750 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U N 0.037 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 4.80000 Y 0.058 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 18.00000 Y 0.081 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.60000 Y 0.079 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.62000 Y 0.034 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 71.00000 Y 0.21 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U N 0.024 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124472-110FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.31000 Y 0.030 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.20000 Y 0.028 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U N 0.027 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified PFOS 1763-23-1 0.00200 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 1.90000 Y 0.047 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124472-110FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.15000 Y 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.79000 Y 0.058 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.41000 Y 0.16 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.17000 F1 J Y 0.070 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124472-1 10 FAY-SW-OLDOF-2-052419 TAL-SAC OLDOF-2 5/24/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124472-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U,H N 0.060 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Hfpo Dimer Acid 13252-13-6 6.20000 E Y 0.0040 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 5.40000 H Y 0.57 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-110FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U,H N 0.046 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.90000 H Y 0.054 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U,H N 0.060 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 H Y 0.015 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00710 Y 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.02600 Y 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.09000 Y 0.0020 280-124971-110FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified PFOA 335-67-1 0.03400 Y 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U,H,*N 0.035 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 18.00000 H Y 0.081 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.57000 H,*J Y 0.034 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 1.40000 H Y 0.079 280-124971-110FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 4.70000 H Y 0.058 280-124971-1 Page 39 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U,H,*N 0.037 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.20000 H Y 0.028 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.35000 H Y 0.030 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 H Y 0.024 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 91.00000 H Y 0.21 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-110FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.16000 Y 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 1.80000 H Y 0.047 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified PFOS 1763-23-1 0.00200 Y 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U,H N 0.11 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.30000 H,F1 Y 0.027 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U,H N 0.041 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.20000 H Y 0.070 280-124971-110FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.39000 H,F1 Y 0.16 280-124971-1 10 FAY-SW-OLDOF-2-060719 TAL-SAC OLDOF-2 6/7/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 1.10000 H Y 0.058 280-124971-1 11 Residential Well Residential Well 12/14/2017 Hfpo Dimer Acid 13252-13-6 0.02100 Y 11 Residential Well Residential Well 12/12/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/13/2017 Hfpo Dimer Acid 13252-13-6 0.03800 Y 11 Residential Well Residential Well 1/24/2018 Hfpo Dimer Acid 13252-13-6 0.05000 Y 11 Residential Well Residential Well 1/24/2018 Hfpo Dimer Acid 13252-13-6 0.01500 Y 11 Residential Well Residential Well 1/24/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 4/25/2018 Hfpo Dimer Acid 13252-13-6 0.00179 Y 11 Residential Well Residential Well 4/25/2018 Hfpo Dimer Acid 13252-13-6 0.00179 Y 11 Residential Well Residential Well 4/25/2018 Hfpo Dimer Acid 13252-13-6 0.00179 Y11Residential Well Residential Well 1/9/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 4/11/2018 Hfpo Dimer Acid 13252-13-6 0.03690 Y 11 Residential Well Residential Well 12/11/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 1/15/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 11/30/2017 Hfpo Dimer Acid 13252-13-6 0.01300 Y 11 Residential Well Residential Well 11/30/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 4/11/2018 Hfpo Dimer Acid 13252-13-6 0.00186 Y 11 Residential Well Residential Well 4/11/2018 Hfpo Dimer Acid 13252-13-6 0.00182 Y 11 Residential Well Residential Well 3/18/2019 Hfpo Dimer Acid 13252-13-6 0.94000 Y 11 Residential Well Residential Well 8/6/2018 Hfpo Dimer Acid 13252-13-6 0.78000 Y 11 Residential Well Residential Well 10/18/2017 Hfpo Dimer Acid 13252-13-6 0.04900 Y11Residential Well Residential Well 12/15/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 1/31/2018 Hfpo Dimer Acid 13252-13-6 0.52700 Y 11 Residential Well Residential Well 11/30/2017 Hfpo Dimer Acid 13252-13-6 0.02000 Y 11 Residential Well Residential Well 11/29/2017 Hfpo Dimer Acid 13252-13-6 0.00400 N 11 Residential Well Residential Well 8/14/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/12/2017 Hfpo Dimer Acid 13252-13-6 0.07600 Y 11 Residential Well Residential Well 12/14/2017 Hfpo Dimer Acid 13252-13-6 0.07800 Y 11 Residential Well Residential Well 1/5/2018 Hfpo Dimer Acid 13252-13-6 0.01200 Y 11 Residential Well Residential Well 1/5/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/7/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/6/2017 Hfpo Dimer Acid 13252-13-6 0.08500 Y11Residential Well Residential Well 4/30/2019 Hfpo Dimer Acid 13252-13-6 0.24000 Y Page 40 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 11 Residential Well Residential Well 5/9/2018 Hfpo Dimer Acid 13252-13-6 0.03600 Y 11 Residential Well Residential Well 1/4/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 9/22/2017 Hfpo Dimer Acid 13252-13-6 0.25000 Y 11 Residential Well Residential Well 12/5/2017 Hfpo Dimer Acid 13252-13-6 0.02400 Y 11 Residential Well Residential Well 12/6/2017 Hfpo Dimer Acid 13252-13-6 0.06300 Y 11 Residential Well Residential Well 12/5/2017 Hfpo Dimer Acid 13252-13-6 0.09400 Y 11 Residential Well Residential Well 12/5/2017 Hfpo Dimer Acid 13252-13-6 0.15000 Y 11 Residential Well Residential Well 2/1/2018 Hfpo Dimer Acid 13252-13-6 0.01800 Y 11 Residential Well Residential Well 2/8/2018 Hfpo Dimer Acid 13252-13-6 0.01400 Y 11 Residential Well Residential Well 12/14/2017 Hfpo Dimer Acid 13252-13-6 0.07800 Y11Residential Well Residential Well 3/1/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 2/7/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/15/2017 Hfpo Dimer Acid 13252-13-6 0.02300 Y 11 Residential Well Residential Well 2/8/2018 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 11/13/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/6/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/7/2017 Hfpo Dimer Acid 13252-13-6 0.42000 Y 11 Residential Well Residential Well 12/7/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 12/7/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 7/27/2018 Hfpo Dimer Acid 13252-13-6 0.12000 Y 11 Residential Well Residential Well 7/27/2018 Hfpo Dimer Acid 13252-13-6 0.02200 Y11Residential Well Residential Well 10/20/2017 Hfpo Dimer Acid 13252-13-6 0.36000 Y 11 Residential Well Residential Well 10/16/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 4/9/2019 Hfpo Dimer Acid 13252-13-6 0.40000 Y 11 Residential Well Residential Well 10/20/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 10/23/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 10/23/2017 Hfpo Dimer Acid 13252-13-6 0.09500 Y 11 Residential Well Residential Well 10/23/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 10/23/2017 Hfpo Dimer Acid 13252-13-6 0.01000 N 11 Residential Well Residential Well 11/6/2017 Hfpo Dimer Acid 13252-13-6 0.34000 Y 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.06000 U N 0.060 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 1.30000 Y 0.57 280-124472-112FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.04600 U N 0.046 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.05400 U N 0.054 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.06000 U N 0.060 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.42000 Y 0.081 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00240 Y 0.0020 280-124472-112FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.01100 Y 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.03500 U N 0.035 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified PFOA 335-67-1 0.00380 Y 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.03400 U N 0.034 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05800 U N 0.058 280-124472-112FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.07900 U N 0.079 280-124472-1 Page 41 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.03700 U N 0.037 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.02800 U N 0.028 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.03300 Y 0.030 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.02400 U N 0.024 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.21000 U N 0.21 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.30000 Y 0.047 280-124472-112FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.02700 U N 0.027 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.01000 Y 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.11000 U N 0.11 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified PFOS 1763-23-1 0.00240 Y 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.04100 U N 0.041 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.16000 U N 0.16 280-124472-112FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.07000 U N 0.070 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.05800 U N 0.058 280-124472-1 12 FAY-SW-GBC-1-052919 TAL-SAC GBC-1 05/29/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.01500 U N 0.015 280-124472-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.00450 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.90000 Y 0.010 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.61000 E Y 0.0040 280-124971-112FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified PFOA 335-67-1 0.00370 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U,*N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.01100 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00230 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-112FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.40000 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U,*N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.01700 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.06000 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00200 *J Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.14000 F1 J Y 0.0050 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-112FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-1 Page 42 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.02900 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00220 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified PFOS 1763-23-1 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.00990 Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-112FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.28000 Y 0.020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.00200 U,F1 N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.02400 F1 J Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.04900 F1 J Y 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U N 0.0020 280-124971-1 12 FAY-SW-GBC-1-060719 TAL-SAC GBC-1 06/07/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U,H N 0.0020 280-124268-313FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.02800 Y 0.0040 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.03100 H Y 0.010 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.00610 H Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified PFOA 335-67-1 0.00680 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124268-113FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00500 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00680 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00330 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.00820 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.04000 H Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U,H N 0.0020 280-124268-313FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.00350 H Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.00990 H Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.13000 H Y 0.0050 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00200 U,H N 0.0020 280-124268-313FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.01300 Y 0.0020 280-124268-1 Page 43 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.02000 U,H N 0.020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified PFOS 1763-23-1 0.01300 Y 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124268-1 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.03100 H,F1 J Y 0.0020 280-124268-313FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.00960 H,F1 J Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.00400 H,F1 J Y 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U,H N 0.0020 280-124268-3 13 FAY-SW-CFR-BLADEN-052219 TAL-SAC CFR-BLADEN 05/22/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124268-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP NVHOS 1132933-86-8 0.00870 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PES 113507-82-7 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.05500 Y 0.010 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFECA B 151772-58-6 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Hfpo Dimer Acid 13252-13-6 0.05700 Y 0.0040 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00200 U N 0.0020 280-124971-113FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorooctadecanoic acid 16517-11-6 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 6 EVS1431 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.06400 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.02000 U N 0.020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorotetradecanoic Acid 376-06-7 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorononanoic Acid 375-95-1 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluoroheptanoic Acid 375-85-9 0.01000 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorobutane Sulfonic Acid 375-73-5 0.00430 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorobutanoic Acid 375-22-4 0.00850 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorohexane Sulfonic Acid 355-46-4 0.00670 Y 0.0020 280-124971-113FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorodecane Sulfonic Acid 335-77-3 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorodecanoic Acid 335-76-2 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorododecanoic Acid 307-55-1 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.02000 U N 0.020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified PFOA 335-67-1 0.00870 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.01600 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.00340 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.00640 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorooctane Sulfonamide 754-91-6 0.00200 U N 0.0020 280-124971-113FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.02000 U N 0.020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.18000 Y 0.0050 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorononanesulfonic acid 68259-12-1 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP EVE Acid 69087-46-3 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorotridecanoic Acid 72629-94-8 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.00490 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.00240 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.02000 U N 0.020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified PFOS 1763-23-1 0.01500 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluoroundecanoic Acid 2058-94-8 0.00200 U N 0.0020 280-124971-113FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.02000 U N 0.020 280-124971-1 Page 44 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.02000 U N 0.020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluoropentanoic Acid 2706-90-3 0.02000 Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 537 Modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP Hydro-EVE Acid 773804-62-9 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.00200 U N 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP R-EVE EVS1428 0.00630 F1,^J Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 5 EVS1430 0.06900 F1,^J Y 0.0020 280-124971-1 13 FAY-SW-CFR-BLADEN-060719 TAL-SAC CFR-BLADEN 06/07/2019 Cl. Spec. Table 3 Compound SOP Byproduct 4 EVS1429 0.01900 F1 J Y 0.0020 280-124971-1 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 10:2 Fluorotelomer sulfonate 120226-60-0 0.00270 U N 0.0027 202791813FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PMPA 13140-29-9 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Hfpo Dimer Acid 13252-13-6 0.01300 Y 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol 1691-99-2 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorooctadecanoic acid 16517-11-6 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorotetradecanoic Acid 376-06-7 0.00089 U N 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)39108-34-4 0.00530 U N 0.0053 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluoroheptane sulfonic acid (PFHpS)375-92-8 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorononanoic Acid 375-95-1 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluoroheptanoic Acid 375-85-9 0.00350 Y 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorobutane Sulfonic Acid 375-73-5 0.00220 J Y 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorobutanoic Acid 375-22-4 0.00530 U N 0.0053 202791813FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorohexane Sulfonic Acid 355-46-4 0.00330 Y 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorodecane Sulfonic Acid 335-77-3 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified N-methyl perfluoro-1-octanesulfonamide 31506-32-8 0.00800 U UJ N 0.008 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorododecanoic Acid 307-55-1 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorohexanoic Acid 307-24-4 0.00560 Y 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified N-ethyl perfluorooctane sulfonamidoacetic acid 2991-50-6 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified PFOA 335-67-1 0.00570 Y 0.00089 2027918 Page 45 of 46 August 2019 APPENDIX A SUMMARY OF ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC, P.C. Pathway Field Sample ID Lab ID Location ID Sample Date Laboratory Analytical Method Parameter Name Parameter Code Report Result (µg/L) Lab Qualifier Validation Qualifier Detected Report Detection Limit (µg/L) Sample Delivery Group (SDG) 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorodecanoic Acid 335-76-2 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFO2HxA 39492-88-1 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified N-ethylperfluoro-1-octanesulfonamide 4151-50-2 0.00800 U UJ N 0.008 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFO4DA 39492-90-5 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFO3OA 39492-89-2 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFO5DA 39492-91-6 0.10000 U N 0.10 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)757124-72-4 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFMOAA 674-13-5 0.05600 Y 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorononanesulfonic acid 68259-12-1 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorohexadecanoic acid (PFHxDA)67905-19-5 0.00089 U N 0.00089 202791813FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP2 749836-20-2 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified F-53B Major 73606-19-6 0.00089 U N 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorotridecanoic Acid 72629-94-8 0.00089 U N 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorooctane Sulfonamide 754-91-6 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified N-methyl perfluorooctane sulfonamidoacetic acid 2355-31-9 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol 24448-09-7 0.00270 U N 0.0027 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluoroundecanoic Acid 2058-94-8 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified PFOS 1763-23-1 0.00840 Y 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PEPA 267239-61-2 0.05000 Y 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFESA-BP1 29311-67-9 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified 6:2 Fluorotelomer sulfonate 27619-97-2 0.00180 U N 0.0018 202791813FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluoropentanoic Acid 2706-90-3 0.00580 Y 0.0053 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluoropentane sulfonic acid (PFPeS)2706-91-4 0.00180 U N 0.0018 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 Cl. Spec. Table 3 Compound SOP PFECA-G 801212-59-9 0.05000 U N 0.050 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified Perfluorododecane sulfonic acid (PFDoS)79780-39-5 0.00089 U N 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified ADONA 958445-44-8 0.00089 U N 0.00089 2027918 13 FAY-SW-CFR-RM-84-020219 LANC CFR-MILE-84 02/04/2019 EPA 537 Rev. 1.1 modified F-53B Minor 83329-89-9 0.00180 U N 0.0018 2027918 Notes: 1. Pathway numbers correspond to Table 1 of the Chemours Fayetteville Works Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes (Geosyntec, 2019). 2. Sampling locations, analytical methods, assessment techniques, and laboratory reports for PFAS concentrations are described in detail in the Seeps and Creeks Investigation Report (Geosyntec, 2019). 3. Onsite laboratory data available only for Outfall 002. 4. Abbreviations LANC - Eurofins Lancaster TAL-SAC - TestAmerica Sacramento J - Analyte detected. Reported value may not be accurate or precise QA/QC - Quality assurance/ quality controlSOP - standard operating procedure U – Analyte not detected. Reporting limit may not be accurate or precise. µg/L - micrograms per liter -- - No data reported N - Analyte not detected above associated reporting limit. Y - Analyte detected above associated reporting limit. FS - Field Sample DUP - Duplicate sample * - Laboratory control spike or laboratory control spike duplicate is outside acceptance limits. ^ - Instrument related quality control is outside acceptance limits. E - Result exceeded calibration range.F1 - Matrix spike and/or matrix spike duplicate recovery is outside acceptance limits. H - Sample was prepped or analyzed beyond the specified holding time. I - Value is estimated maximum possible concentration. Page 46 of 46 August 2019 Appendix B – Supplemental Flow Gauging Data 1 August 2019 APPENDIX B SUPPLEMENTAL FLOW GAUGING DATA APPENDIX B-1 SUMMARY OF FLOW CALCULATIONS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Pathway Sampling Event Start Date End Date Minimum Flow (L/s) 1st Quartile Flow (L/s) Median Flow (L/s) 3rd Quartile Flow (L/s) Maximum Flow (L/s) Average Flow (L/s) Geomean Flow (L/s)Comments 1 Surface Water 02/19 2/1/2019 2/7/2019 123,986 138,290 164,036 182,549 267,449 171,093 165,871 2 Surface Water 02/19 2/1/2019 2/7/2019 184 NA NA NA 309 NA NA 3 Surface Water 02/19 2/1/2019 2/7/2019 NA NA NA NA NA NA NA 4 Surface Water 02/19 2/1/2019 2/7/2019 773 813 836 871 1,099 868 863 5 Surface Water 02/19 2/1/2019 2/7/2019 10 19 20 24 15 22 21 6 Surface Water 02/19 2/1/2019 2/7/2019 1.7 NA NA NA 4.3 NA NA 7 Surface Water 02/19 2/1/2019 2/7/2019 2.2 NA NA NA 5.5 NA NA 8 Surface Water 02/19 2/1/2019 2/7/2019 0.5 NA NA NA 1.3 NA NA 9 Surface Water 06/19 6/4/2019 6/7/2019 1.2 NA NA NA 3.1 NA NA Flows at Seep D were not measured in February 2019; Measurements from June 2019 were used. 10 Surface Water 02/19 2/1/2019 2/7/2019 25 NA NA NA 55 NA NA 11 Surface Water 02/19 2/1/2019 2/7/2019 195 NA NA NA 313 NA NA 12 Surface Water 05/19 5/20/2019 5/30/2019 154 NA NA NA 258 NA NA Flows at GBC were not measured in February 2019; Measurements from May 2019 were used. 1 Surface Water 05/19 5/20/2019 5/30/2019 30,821 33,756 38,547 44,609 55,558 40,173 39,466 2 Surface Water 05/19 5/20/2019 5/30/2019 183 NA NA NA 184 NA NA 3 Surface Water 05/19 5/20/2019 5/30/2019 NA NA NA NA NA NA NA 4 Surface Water 05/19 5/20/2019 5/30/2019 971 1,052 1,082 1,106 1,200 1,082 1,081 5 Surface Water 05/19 5/20/2019 5/30/2019 10 19 20 24 16 22 21 6A Surface Water 05/19 5/20/2019 5/30/2019 1.9 NA NA NA 3.8 NA NA 6B Surface Water 02/19 2/1/2019 2/7/2019 2.2 NA NA NA 5.5 NA NA Flows at Seep B were not measured in May 2019; Measurements from Feb 2019 were used. 6C Surface Water 05/19 5/20/2019 5/30/2019 0.4 NA NA NA 1.2 NA NA 6D Surface Water 06/19 6/4/2019 6/7/2019 1.2 NA NA NA 3.1 NA NA Flows at Seep D were not measured in May 2019; Measurements from June 2019 were used. 7 Surface Water 05/19 5/20/2019 5/30/2019 22 NA NA NA 44 NA NA 8 Surface Water 05/19 5/20/2019 5/30/2019 195 NA NA NA 313 NA NA 9 Surface Water 05/19 5/20/2019 5/30/2019 154 NA NA NA 258 NA NA 1 Surface Water 06/19 6/4/2019 6/7/2019 26,703 27,044 29,670 32,450 32,885 29,824 29,687 2 Surface Water 06/19 6/4/2019 6/7/2019 183 NA NA NA 184 NA NA 3 Surface Water 06/19 6/4/2019 6/7/2019 NA NA NA NA NA NA NA 4 Surface Water 06/19 6/4/2019 6/7/2019 1,139 1,151 1,173 1,197 1,214 1,175 1,174 5 Surface Water 06/19 6/4/2019 6/7/2019 6.3 19 20 24 11 22 21 6A Surface Water 06/19 6/4/2019 6/7/2019 6.9 NA NA NA 12 NA NA 6B Surface Water 06/19 6/4/2019 6/7/2019 1.3 NA NA NA 3.2 NA NA 6C Surface Water 06/19 6/4/2019 6/7/2019 0.3 NA NA NA 0.8 NA NA 6D Surface Water 06/19 6/4/2019 6/7/2019 1.2 NA NA NA 3.1 NA NA 7 Surface Water 06/19 6/4/2019 6/7/2019 28 NA NA NA 32 NA NA 8 Surface Water 06/19 6/4/2019 6/7/2019 195 NA NA NA 313 NA NA 9 Surface Water 06/19 6/4/2019 6/7/2019 161 NA NA NA 271 NA NA Notes: 1) L/s: Liter per second. Page 1 of 1 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 1/1/2017 2,500 2.4 0.02 70,792 251 19 2 8,911 0.3 0.2 287.5 12.0 1/2/2017 2,780 2.6 0.61 78,721 251 19 2 9,792 0.3 0.2 284.1 11.8 1/3/2017 5,380 3.7 0.52 152,345 251 20 2 16,796 0.3 0.2 251.8 10.5 1/4/2017 8,630 4.9 0 244,374 251 21 2 24,128 0.4 0.2 225.5 9.4 1/5/2017 8,800 4.9 0 249,188 251 21 2 24,446 0.4 0.2 224.1 9.3 1/6/2017 7,100 4.4 0.35 201,050 251 21 2 20,843 0.3 0.2 236.8 9.9 1/7/2017 7,990 4.7 0.57 226,252 251 21 2 22,734 0.4 0.2 229.5 9.6 1/8/2017 9,260 5.1 0.01 262,214 251 22 2 25,402 0.4 0.2 221.3 9.2 1/9/2017 8,760 4.9 0.04 248,056 251 21 2 24,383 0.4 0.2 224.5 9.4 1/10/2017 7,560 4.5 0.05 214,075 251 21 2 21,850 0.3 0.2 233.1 9.7 1/11/2017 6,720 4.2 0 190,289 251 21 2 19,965 0.3 0.2 239.7 10.0 1/12/2017 6,210 4.1 0 175,848 251 20 2 18,904 0.3 0.2 245.6 10.2 1/13/2017 6,020 4.0 0 170,467 251 20 2 18,468 0.3 0.2 247.5 10.3 1/14/2017 6,040 4.0 0 171,034 251 20 2 18,530 0.3 0.2 247.5 10.3 1/15/2017 5,230 3.7 0 148,097 251 20 2 16,611 0.3 0.2 256.2 10.7 1/16/2017 4,230 3.3 0 119,780 251 20 2 14,103 0.3 0.2 268.9 11.2 1/17/2017 3,810 3.1 0 107,887 251 20 2 12,953 0.3 0.2 274.2 11.4 1/18/2017 3,510 2.9 0 99,392 251 19 2 12,111 0.3 0.2 278.3 11.6 1/19/2017 2,950 2.7 0 83,535 251 19 2 10,383 0.3 0.2 283.9 11.8 1/20/2017 2,680 2.5 0 75,889 251 19 2 9,557 0.3 0.2 287.6 12.0 1/21/2017 2,630 2.5 0.03 74,473 251 19 2 9,322 0.3 0.2 285.9 11.9 1/22/2017 2,670 2.5 0.31 75,606 251 19 2 9,498 0.3 0.2 286.9 12.0 1/23/2017 3,140 2.8 0.04 88,915 251 19 2 10,976 0.3 0.2 282.0 11.7 1/24/2017 5,060 3.6 0 143,283 251 20 2 15,996 0.3 0.2 255.0 10.6 1/25/2017 9,720 5.2 0 275,240 251 22 2 26,360 0.4 0.3 218.8 9.1 1/26/2017 9,340 5.1 0.01 264,479 251 22 2 25,593 0.4 0.2 221.0 9.2 1/27/2017 8,280 4.8 0 234,463 251 21 2 23,367 0.4 0.2 227.6 9.5 1/28/2017 7,470 4.5 0 211,527 251 21 2 21,661 0.3 0.2 233.9 9.7 1/29/2017 7,090 4.4 0 200,766 251 21 2 20,843 0.3 0.2 237.1 9.9 1/30/2017 6,800 4.3 0 192,555 251 21 2 20,153 0.3 0.2 239.1 10.0 1/31/2017 5,970 4.0 0 169,052 251 20 2 18,344 0.3 0.2 247.9 10.3 2/1/2017 4,590 3.4 0 129,974 251 20 2 14,955 0.3 0.2 262.8 11.0 2/2/2017 2,960 2.7 0 83,818 251 19 2 10,442 0.3 0.2 284.6 11.9 2/3/2017 2,660 2.5 0.03 75,323 251 19 2 9,498 0.3 0.2 288.0 12.0 2/4/2017 2,530 2.4 0 71,642 251 19 2 9,028 0.3 0.2 287.9 12.0 2/5/2017 2,410 2.4 0 68,244 251 19 2 8,619 0.3 0.2 288.5 12.0 2/6/2017 2,390 2.3 0 67,677 251 19 2 8,561 0.3 0.2 288.9 12.0 2/7/2017 2,290 2.3 0 64,846 251 19 2 8,153 0.3 0.2 287.2 12.0 2/8/2017 2,030 2.1 0.14 57,483 251 19 2 7,170 0.3 0.2 284.9 11.9 2/9/2017 2,040 2.1 0.16 57,766 251 19 2 7,227 0.3 0.2 285.8 11.9 Page 1 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 2/10/2017 2,170 2.2 0 61,448 251 19 2 7,747 0.3 0.2 288.0 12.0 2/11/2017 2,300 2.3 0 65,129 251 19 2 8,211 0.3 0.2 288.0 12.0 2/12/2017 2,390 2.3 0 67,677 251 19 2 8,561 0.3 0.2 288.9 12.0 2/13/2017 2,260 2.3 0 63,996 251 19 2 8,095 0.3 0.2 288.9 12.0 2/14/2017 2,120 2.2 0 60,032 251 19 2 7,574 0.3 0.2 288.2 12.0 2/15/2017 2,270 2.3 0.7 64,279 251 19 2 8,095 0.3 0.2 287.7 12.0 2/16/2017 3,000 2.7 0 84,951 251 19 2 10,561 0.3 0.2 284.0 11.8 2/17/2017 3,300 2.8 0 93,446 251 19 2 11,513 0.3 0.2 281.4 11.7 2/18/2017 3,240 2.8 0 91,747 251 19 2 11,333 0.3 0.2 282.2 11.8 2/19/2017 2,980 2.7 0 84,384 251 19 2 10,501 0.3 0.2 284.3 11.8 2/20/2017 2,720 2.5 0 77,022 251 19 2 9,674 0.3 0.2 286.9 12.0 2/21/2017 2,540 2.4 0 71,925 251 19 2 9,028 0.3 0.2 286.7 11.9 2/22/2017 2,310 2.3 0 65,412 251 19 2 8,270 0.3 0.2 288.8 12.0 2/23/2017 1,910 2.0 0 54,085 251 18 2 6,710 0.3 0.2 283.4 11.8 2/24/2017 1,800 2.0 0 50,970 251 18 2 6,310 0.3 0.2 282.8 11.8 2/25/2017 1,730 1.9 0 48,988 251 18 2 6,025 0.3 0.2 280.9 11.7 2/26/2017 1,730 1.9 0 48,988 251 18 2 6,025 0.3 0.2 280.9 11.7 2/27/2017 1,690 1.9 0 47,855 251 18 2 5,854 0.3 0.2 279.4 11.6 2/28/2017 1,650 1.8 0 46,723 251 18 2 5,684 0.3 0.2 277.9 11.6 3/1/2017 1,630 1.8 0.46 46,156 251 18 2 5,627 0.3 0.2 278.5 11.6 3/2/2017 1,900 2.0 0.09 53,802 251 18 2 6,710 0.3 0.2 284.9 11.9 3/3/2017 2,240 2.2 0 63,430 251 19 2 7,979 0.3 0.2 287.3 12.0 3/4/2017 2,640 2.5 0 74,756 251 19 2 9,380 0.3 0.2 286.6 11.9 3/5/2017 2,610 2.5 0 73,907 251 19 2 9,322 0.3 0.2 288.1 12.0 3/6/2017 2,180 2.2 0 61,731 251 19 2 7,747 0.3 0.2 286.7 11.9 3/7/2017 1,920 2.0 0 54,368 251 18 2 6,767 0.3 0.2 284.3 11.8 3/8/2017 2,360 2.3 0.01 66,828 251 19 2 8,386 0.3 0.2 286.6 11.9 3/9/2017 2,420 2.4 0 68,527 251 19 2 8,678 0.3 0.2 289.3 12.1 3/10/2017 2,390 2.3 0.06 67,677 251 19 2 8,561 0.3 0.2 288.9 12.0 3/11/2017 2,330 2.3 0 65,978 251 19 2 8,328 0.3 0.2 288.3 12.0 3/12/2017 1,930 2.0 0.19 54,652 251 18 2 6,825 0.3 0.2 285.3 11.9 3/13/2017 1,810 2.0 0.88 51,253 251 18 2 6,367 0.3 0.2 283.7 11.8 3/14/2017 2,320 2.3 0.34 65,695 251 19 2 8,270 0.3 0.2 287.5 12.0 3/15/2017 2,790 2.6 0 79,004 251 19 2 9,910 0.3 0.2 286.5 11.9 3/16/2017 2,860 2.6 0 80,986 251 19 2 10,146 0.3 0.2 286.2 11.9 3/17/2017 2,760 2.6 0 78,154 251 19 2 9,792 0.3 0.2 286.2 11.9 3/18/2017 2,510 2.4 0.24 71,075 251 19 2 8,970 0.3 0.2 288.3 12.0 3/19/2017 2,400 2.3 0 67,960 251 19 2 8,561 0.3 0.2 287.7 12.0 3/20/2017 2,240 2.3 0 63,430 251 19 2 8,037 0.3 0.2 289.4 12.1 3/21/2017 2,280 2.3 0.01 64,562 251 19 2 8,153 0.3 0.2 288.5 12.0 Page 2 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 3/22/2017 2,610 0.37 73,907 251 16 2 -5,339 -0.5 -0.3 -165.0 -6.9 3/23/2017 2,730 2.5 0 77,305 251 19 2 9,674 0.3 0.2 285.9 11.9 3/24/2017 2,590 2.5 0 73,341 251 19 2 9,204 0.3 0.2 286.7 11.9 3/25/2017 2,060 2.1 0 58,333 251 19 2 7,343 0.3 0.2 287.5 12.0 3/26/2017 1,820 2.0 0 51,537 251 18 2 6,367 0.3 0.2 282.2 11.8 3/27/2017 1,640 1.8 0 46,440 251 18 2 5,627 0.3 0.2 276.8 11.5 3/28/2017 1,580 1.8 0.14 44,741 251 18 2 5,344 0.3 0.2 272.8 11.4 3/29/2017 1,580 1.8 0 44,741 251 18 2 5,400 0.3 0.2 275.7 11.5 3/30/2017 1,540 1.8 0 43,608 251 18 2 5,231 0.3 0.2 274.0 11.4 3/31/2017 1,790 1.9 1.24 50,687 251 18 2 6,253 0.3 0.2 281.8 11.7 4/1/2017 2,820 2.6 0 79,854 251 19 2 9,969 0.3 0.2 285.2 11.9 4/2/2017 3,000 2.7 0 84,951 251 19 2 10,561 0.3 0.2 284.0 11.8 4/3/2017 2,640 2.5 0.57 74,756 251 19 2 9,380 0.3 0.2 286.6 11.9 4/4/2017 3,040 2.7 0 86,083 251 19 2 10,679 0.3 0.2 283.4 11.8 4/5/2017 4,200 3.3 0.84 118,931 251 20 2 13,981 0.3 0.2 268.5 11.2 4/6/2017 5,620 3.8 0.01 159,141 251 20 2 17,538 0.3 0.2 251.7 10.5 4/7/2017 6,570 4.2 0 186,042 251 21 2 19,653 0.3 0.2 241.3 10.1 4/8/2017 7,730 4.6 0 218,889 251 21 2 22,228 0.3 0.2 232.0 9.7 4/9/2017 6,980 4.3 0 197,652 251 21 2 20,592 0.3 0.2 238.0 9.9 4/10/2017 4,940 3.6 0 139,885 251 20 2 15,812 0.3 0.2 258.2 10.8 4/11/2017 2,670 2.5 0 75,606 251 19 2 9,439 0.3 0.2 285.2 11.9 4/12/2017 2,070 2.1 0 58,616 251 19 2 7,343 0.3 0.2 286.1 11.9 4/13/2017 1,850 2.0 0 52,386 251 18 2 6,481 0.3 0.2 282.6 11.8 4/14/2017 1,740 1.9 0 49,271 251 18 2 6,082 0.3 0.2 281.9 11.7 4/15/2017 1,670 1.9 0 47,289 251 18 2 5,797 0.3 0.2 280.0 11.7 4/16/2017 1,580 1.8 0 44,741 251 18 2 5,400 0.3 0.2 275.7 11.5 4/17/2017 1,510 1.7 0.04 42,758 251 18 2 5,062 0.3 0.2 270.4 11.3 4/18/2017 1,480 1.7 0.02 41,909 251 18 2 4,949 0.3 0.2 269.8 11.2 4/19/2017 1,360 1.6 0 38,511 251 18 2 4,388 0.3 0.2 260.3 10.8 4/20/2017 1,290 1.6 0 36,529 251 18 2 4,053 0.3 0.2 253.5 10.6 4/21/2017 1,260 1.5 0 35,679 251 18 2 3,942 0.3 0.2 252.4 10.5 4/22/2017 1,260 1.5 0.18 35,679 251 18 2 3,942 0.3 0.2 252.4 10.5 4/23/2017 1,300 1.6 0.13 36,812 251 18 2 4,109 0.3 0.2 255.0 10.6 4/24/2017 2,160 2.1 3.07 61,164 251 19 2 7,343 0.3 0.2 274.2 11.4 4/25/2017 12,700 0.12 359,624 251 16 2 -5,339 -2.4 -1.6 -33.9 -1.4 4/26/2017 24,500 14.9 0 693,763 251 31 2 88,288 0.3 0.2 290.7 12.1 4/27/2017 23,200 15.7 0 656,951 251 32 2 92,911 0.2 0.2 323.1 13.5 4/28/2017 22,000 15.2 0 622,971 251 32 2 90,038 0.2 0.2 330.1 13.8 4/29/2017 19,800 13.7 0 560,674 251 30 2 80,690 0.2 0.2 328.7 13.7 4/30/2017 17,600 11.7 0 498,377 251 28 2 68,031 0.3 0.2 311.8 13.0 Page 3 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 5/1/2017 16,000 10.0 0.39 453,070 251 26 2 57,525 0.3 0.2 290.0 12.1 5/2/2017 15,000 9.1 0 424,753 251 25 2 51,207 0.3 0.2 275.4 11.5 5/3/2017 14,300 8.4 0 404,931 251 25 2 46,829 0.3 0.2 264.2 11.0 5/4/2017 13,800 7.9 0.02 390,772 251 24 2 43,493 0.3 0.2 254.2 10.6 5/5/2017 13,700 7.7 0.83 387,941 251 24 2 42,512 0.3 0.2 250.3 10.4 5/6/2017 14,700 8.3 0 416,258 251 25 2 46,044 0.3 0.2 252.7 10.5 5/7/2017 14,400 8.3 0 407,763 251 25 2 45,978 0.3 0.2 257.6 10.7 5/8/2017 11,400 6.6 0 322,812 251 23 2 35,270 0.3 0.2 249.6 10.4 5/9/2017 7,790 4.7 0 220,588 251 21 2 22,860 0.3 0.2 236.7 9.9 5/10/2017 5,710 3.9 0 161,689 251 20 2 18,220 0.3 0.2 257.4 10.7 5/11/2017 3,560 3.1 0 100,808 251 19 2 12,772 0.3 0.2 289.4 12.1 5/12/2017 3,130 2.8 0 88,632 251 19 2 11,513 0.3 0.2 296.7 12.4 5/13/2017 2,770 2.7 0.02 78,438 251 19 2 10,383 0.3 0.2 302.4 12.6 5/14/2017 2,530 2.5 0 71,642 251 19 2 9,557 0.3 0.2 304.7 12.7 5/15/2017 2,410 2.4 0 68,244 251 19 2 9,146 0.3 0.2 306.1 12.8 5/16/2017 2,150 2.3 0 60,881 251 19 2 8,153 0.3 0.2 305.9 12.7 5/17/2017 1,650 1.9 0 46,723 251 18 2 6,196 0.3 0.2 302.9 12.6 5/18/2017 1,460 1.8 0 41,343 251 18 2 5,400 0.3 0.2 298.4 12.4 5/19/2017 1,360 1.7 0 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 5/20/2017 1,270 1.6 0 35,962 251 18 2 4,444 0.3 0.2 282.3 11.8 5/21/2017 1,480 1.8 0 41,909 251 18 2 5,457 0.3 0.2 297.4 12.4 5/22/2017 1,490 1.8 1.25 42,192 251 18 2 5,514 0.3 0.2 298.5 12.4 5/23/2017 2,520 2.5 0.76 71,358 251 19 2 9,204 0.3 0.2 294.6 12.3 5/24/2017 5,640 3.9 0.35 159,707 251 20 2 18,033 0.3 0.2 257.9 10.7 5/25/2017 9,210 5.2 0 260,798 251 22 2 25,848 0.4 0.2 226.4 9.4 5/26/2017 11,900 6.0 0 336,970 251 22 2 30,990 0.4 0.3 210.1 8.8 5/27/2017 12,900 6.6 0 365,287 251 23 2 35,074 0.4 0.3 219.3 9.1 5/28/2017 10,700 5.6 0.06 302,990 251 22 2 28,926 0.4 0.3 218.1 9.1 5/29/2017 7,890 0.26 223,420 251 16 2 -5,339 -1.5 -1.0 -54.6 -2.3 5/30/2017 6,800 0.08 192,555 251 16 2 -5,339 -1.3 -0.9 -63.3 -2.6 5/31/2017 6,860 0 194,254 251 16 2 -5,339 -1.3 -0.9 -62.8 -2.6 6/1/2017 7,510 0 212,660 251 16 2 -5,339 -1.4 -1.0 -57.3 -2.4 6/2/2017 7,680 4.7 0 217,473 251 21 2 22,671 0.3 0.2 238.1 9.9 6/3/2017 6,570 4.3 0.13 186,042 251 21 2 20,216 0.3 0.2 248.2 10.3 6/4/2017 4,360 3.4 0 123,461 251 20 2 14,955 0.3 0.2 276.7 11.5 6/5/2017 2,810 2.7 1.66 79,570 251 19 2 10,501 0.3 0.2 301.5 12.6 6/6/2017 3,460 3.0 0 97,976 251 19 2 12,471 0.3 0.2 290.8 12.1 6/7/2017 4,190 3.4 0 118,648 251 20 2 14,589 0.3 0.2 280.9 11.7 6/8/2017 4,530 3.5 0.02 128,275 251 20 2 15,444 0.3 0.2 275.0 11.5 6/9/2017 4,540 3.5 0 128,558 251 20 2 15,444 0.3 0.2 274.4 11.4 Page 4 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 6/10/2017 3,500 3.0 0 99,109 251 19 2 12,591 0.3 0.2 290.2 12.1 6/11/2017 2,340 2.4 0 66,261 251 19 2 8,853 0.3 0.2 305.2 12.7 6/12/2017 1,960 2.2 0 55,501 251 19 2 7,458 0.3 0.2 307.0 12.8 6/13/2017 1,530 1.8 0 43,325 251 18 2 5,684 0.3 0.2 299.7 12.5 6/14/2017 1,130 1.5 0.96 31,998 251 18 2 3,775 0.3 0.2 269.5 11.2 6/15/2017 1,300 1.7 0.03 36,812 251 18 2 4,612 0.3 0.2 286.2 11.9 6/16/2017 1,530 1.8 0.04 43,325 251 18 2 5,684 0.3 0.2 299.7 12.5 6/17/2017 1,460 1.8 0.03 41,343 251 18 2 5,400 0.3 0.2 298.4 12.4 6/18/2017 1,900 2.1 0 53,802 251 19 2 7,170 0.3 0.2 304.4 12.7 6/19/2017 2,010 2.2 0 56,917 251 19 2 7,631 0.3 0.2 306.3 12.8 6/20/2017 3,220 2.8 0.74 91,180 251 19 2 11,453 0.3 0.2 286.9 12.0 6/21/2017 5,400 3.8 0.12 152,911 251 20 2 17,538 0.3 0.2 262.0 10.9 6/22/2017 9,480 5.2 0.4 268,444 251 22 2 26,360 0.4 0.2 224.3 9.3 6/23/2017 8,360 4.9 0 236,729 251 21 2 24,128 0.3 0.2 232.8 9.7 6/24/2017 8,710 5.0 1.93 246,640 251 21 2 24,764 0.4 0.2 229.4 9.6 6/25/2017 11,700 5.9 0.01 331,307 251 22 2 30,602 0.4 0.3 211.0 8.8 6/26/2017 11,600 5.9 0 328,475 251 22 2 30,538 0.4 0.3 212.4 8.8 6/27/2017 10,200 5.5 0 288,832 251 22 2 27,833 0.4 0.2 220.1 9.2 6/28/2017 9,160 5.1 0 259,382 251 22 2 25,721 0.4 0.2 226.5 9.4 6/29/2017 8,060 4.8 0 228,234 251 21 2 23,430 0.3 0.2 234.5 9.8 6/30/2017 6,560 4.3 1.84 185,759 251 21 2 20,216 0.3 0.2 248.6 10.4 7/1/2017 5,420 3.8 0.01 153,477 251 20 2 17,538 0.3 0.2 261.0 10.9 7/2/2017 3,110 2.8 0 88,065 251 19 2 11,453 0.3 0.2 297.1 12.4 7/3/2017 2,730 2.6 0.2 77,305 251 19 2 10,205 0.3 0.2 301.5 12.6 7/4/2017 3,170 2.9 0.03 89,764 251 19 2 11,632 0.3 0.2 296.0 12.3 7/5/2017 2,820 2.7 0 79,854 251 19 2 10,501 0.3 0.2 300.4 12.5 7/6/2017 2,300 2.4 0 65,129 251 19 2 8,736 0.3 0.2 306.4 12.8 7/7/2017 1,880 2.1 0 53,236 251 19 2 7,170 0.3 0.2 307.6 12.8 7/8/2017 1,710 2.0 0 48,422 251 18 2 6,481 0.3 0.2 305.7 12.7 7/9/2017 1,680 2.0 0 47,572 251 18 2 6,310 0.3 0.2 303.0 12.6 7/10/2017 1,630 1.9 0.82 46,156 251 18 2 6,082 0.3 0.2 301.0 12.5 7/11/2017 1,510 1.8 0 42,758 251 18 2 5,570 0.3 0.2 297.6 12.4 7/12/2017 1,530 1.8 0 43,325 251 18 2 5,684 0.3 0.2 299.7 12.5 7/13/2017 1,430 1.8 0 40,493 251 18 2 5,231 0.3 0.2 295.1 12.3 7/14/2017 1,220 1.6 0 34,547 251 18 2 4,221 0.3 0.2 279.1 11.6 7/15/2017 1,130 1.5 0.33 31,998 251 18 2 3,775 0.3 0.2 269.5 11.2 7/16/2017 1,310 1.7 0.12 37,095 251 18 2 4,668 0.3 0.2 287.5 12.0 7/17/2017 1,430 1.8 0.05 40,493 251 18 2 5,231 0.3 0.2 295.1 12.3 7/18/2017 1,420 1.8 0.31 40,210 251 18 2 5,175 0.3 0.2 294.0 12.2 7/19/2017 1,320 1.7 0 37,378 251 18 2 4,724 0.3 0.2 288.7 12.0 Page 5 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 7/20/2017 1,320 1.7 0 37,378 251 18 2 4,724 0.3 0.2 288.7 12.0 7/21/2017 1,410 1.7 0 39,927 251 18 2 5,118 0.3 0.2 292.8 12.2 7/22/2017 1,480 1.8 0 41,909 251 18 2 5,457 0.3 0.2 297.4 12.4 7/23/2017 1,360 1.7 0.13 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 7/24/2017 1,490 1.8 0 42,192 251 18 2 5,457 0.3 0.2 295.4 12.3 7/25/2017 1,420 1.8 0 40,210 251 18 2 5,175 0.3 0.2 294.0 12.2 7/26/2017 1,300 1.7 0 36,812 251 18 2 4,612 0.3 0.2 286.2 11.9 7/27/2017 1,140 1.5 0 32,281 251 18 2 3,831 0.3 0.2 271.1 11.3 7/28/2017 1,050 1.4 0 29,733 251 18 2 3,384 0.3 0.2 260.0 10.8 7/29/2017 1,060 1.4 0.44 30,016 251 18 2 3,384 0.3 0.2 257.5 10.7 7/30/2017 1,050 1.4 0 29,733 251 18 2 3,384 0.3 0.2 260.0 10.8 7/31/2017 1,050 1.4 0 29,733 251 18 2 3,328 0.3 0.2 255.7 10.7 8/1/2017 1,010 1.4 0 28,600 251 18 2 3,159 0.3 0.2 252.3 10.5 8/2/2017 964 1.3 0 27,297 251 18 2 2,877 0.3 0.2 240.7 10.0 8/3/2017 946 1.3 0 26,788 251 18 2 2,763 0.3 0.2 235.6 9.8 8/4/2017 929 1.3 0.02 26,306 251 18 2 2,650 0.4 0.2 230.1 9.6 8/5/2017 943 1.3 0 26,703 251 18 2 2,763 0.3 0.2 236.4 9.8 8/6/2017 941 1.3 0 26,646 251 18 2 2,763 0.3 0.2 236.9 9.9 8/7/2017 994 1.4 0.12 28,147 251 18 2 3,047 0.3 0.2 247.2 10.3 8/8/2017 1,210 1.6 1.4 34,263 251 18 2 4,165 0.3 0.2 277.7 11.6 8/9/2017 1,380 1.7 0.11 39,077 251 18 2 5,005 0.3 0.2 292.6 12.2 8/10/2017 1,460 1.8 0 41,343 251 18 2 5,344 0.3 0.2 295.3 12.3 8/11/2017 1,300 1.7 0.01 36,812 251 18 2 4,612 0.3 0.2 286.2 11.9 8/12/2017 1,270 1.6 0.47 35,962 251 18 2 4,444 0.3 0.2 282.3 11.8 8/13/2017 2,290 2.3 1.72 64,846 251 19 2 8,561 0.3 0.2 301.6 12.6 8/14/2017 2,880 2.7 0.01 81,553 251 19 2 10,679 0.3 0.2 299.1 12.5 8/15/2017 1,910 2.1 0.05 54,085 251 19 2 7,227 0.3 0.2 305.2 12.7 8/16/2017 1,460 1.8 0 41,343 251 18 2 5,400 0.3 0.2 298.4 12.4 8/17/2017 1,280 1.6 0.24 36,246 251 18 2 4,500 0.3 0.2 283.6 11.8 8/18/2017 1,360 1.7 0 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 8/19/2017 1,330 1.7 0 37,661 251 18 2 4,780 0.3 0.2 289.9 12.1 8/20/2017 1,160 1.5 0 32,848 251 18 2 3,942 0.3 0.2 274.1 11.4 8/21/2017 1,030 1.4 0 29,166 251 18 2 3,272 0.3 0.2 256.2 10.7 8/22/2017 1,020 1.4 0 28,883 251 18 2 3,216 0.3 0.2 254.3 10.6 8/23/2017 1,000 1.4 1.02 28,317 251 18 2 3,103 0.3 0.2 250.3 10.4 8/24/2017 1,060 1.4 0 30,016 251 18 2 3,384 0.3 0.2 257.5 10.7 8/25/2017 1,110 1.5 0 31,432 251 18 2 3,664 0.3 0.2 266.3 11.1 8/26/2017 984 1.4 0 27,864 251 18 2 2,990 0.3 0.2 245.1 10.2 8/27/2017 892 1.3 0 25,259 251 18 2 2,479 0.4 0.2 224.1 9.3 8/28/2017 999 1.4 0.22 28,289 251 18 2 3,047 0.3 0.2 246.0 10.2 Page 6 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 8/29/2017 1,000 1.4 0.01 28,317 251 18 2 3,103 0.3 0.2 250.3 10.4 8/30/2017 930 1.3 0 26,335 251 18 2 2,650 0.4 0.2 229.8 9.6 8/31/2017 885 1.3 0.29 25,060 251 18 2 2,421 0.4 0.2 220.7 9.2 9/1/2017 994 1.4 0.93 28,147 251 18 2 2,990 0.3 0.2 242.6 10.1 9/2/2017 2,240 2.3 0.05 63,430 251 19 2 8,503 0.3 0.2 306.2 12.8 9/3/2017 2,290 2.4 0 64,846 251 19 2 8,678 0.3 0.2 305.7 12.7 9/4/2017 1,630 1.9 0 46,156 251 18 2 6,082 0.3 0.2 301.0 12.5 9/5/2017 1,330 1.7 0.05 37,661 251 18 2 4,780 0.3 0.2 289.9 12.1 9/6/2017 1,480 1.8 0.57 41,909 251 18 2 5,457 0.3 0.2 297.4 12.4 9/7/2017 1,680 2.0 0 47,572 251 18 2 6,310 0.3 0.2 303.0 12.6 9/8/2017 1,750 2.0 0 49,554 251 18 2 6,596 0.3 0.2 304.0 12.7 9/9/2017 1,410 1.7 0 39,927 251 18 2 5,118 0.3 0.2 292.8 12.2 9/10/2017 1,250 1.6 0 35,396 251 18 2 4,388 0.3 0.2 283.2 11.8 9/11/2017 1,160 1.5 0.05 32,848 251 18 2 3,887 0.3 0.2 270.3 11.3 9/12/2017 1,310 1.7 0.96 37,095 251 18 2 4,612 0.3 0.2 284.0 11.8 9/13/2017 1,500 1.8 0 42,475 251 18 2 5,570 0.3 0.2 299.6 12.5 9/14/2017 1,380 1.7 0 39,077 251 18 2 5,005 0.3 0.2 292.6 12.2 9/15/2017 1,250 1.6 0 35,396 251 18 2 4,388 0.3 0.2 283.2 11.8 9/16/2017 1,170 1.5 0 33,131 251 18 2 3,942 0.3 0.2 271.8 11.3 9/17/2017 1,090 1.5 0 30,865 251 18 2 3,552 0.3 0.2 262.9 11.0 9/18/2017 1,010 1.4 0 28,600 251 18 2 3,159 0.3 0.2 252.3 10.5 9/19/2017 948 1.3 0 26,844 251 18 2 2,763 0.3 0.2 235.1 9.8 9/20/2017 923 1.3 0.28 26,136 251 18 2 2,650 0.3 0.2 231.6 9.6 9/21/2017 943 1.3 0 26,703 251 18 2 2,763 0.3 0.2 236.4 9.8 9/22/2017 892 1.3 0 25,259 251 18 2 2,479 0.4 0.2 224.1 9.3 9/23/2017 860 1.2 0 24,352 251 18 2 2,250 0.4 0.3 211.0 8.8 9/24/2017 839 1.2 0 23,758 251 18 2 2,135 0.4 0.3 205.2 8.6 9/25/2017 814 1.2 0 23,050 251 18 2 1,962 0.4 0.3 194.4 8.1 9/26/2017 820 1.2 0 23,220 251 18 2 2,020 0.4 0.3 198.7 8.3 9/27/2017 804 1.2 0 22,767 251 18 2 1,904 0.4 0.3 191.0 8.0 9/28/2017 786 1.2 0 22,257 251 18 2 1,788 0.4 0.3 183.5 7.6 9/29/2017 793 1.2 0 22,455 251 18 2 1,846 0.4 0.3 187.8 7.8 9/30/2017 777 1.1 0 22,002 251 18 2 1,730 0.4 0.3 179.7 7.5 10/1/2017 775 1.1 0 21,946 251 18 2 1,730 0.4 0.3 180.1 7.5 10/2/2017 758 1.1 0 21,464 251 18 2 1,614 0.5 0.3 171.8 7.2 10/3/2017 766 1.1 0 21,691 251 18 2 1,672 0.5 0.3 176.1 7.3 10/4/2017 792 1.2 0 22,427 251 18 2 1,846 0.4 0.3 188.0 7.8 10/5/2017 790 1.2 0 22,370 251 18 2 1,788 0.4 0.3 182.6 7.6 10/6/2017 791 1.2 0 22,399 251 18 2 1,846 0.4 0.3 188.3 7.8 10/7/2017 786 1.2 1.86 22,257 251 18 2 1,788 0.4 0.3 183.5 7.6 Page 7 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 10/8/2017 893 1.3 1.14 25,287 251 18 2 2,421 0.4 0.3 218.7 9.1 10/9/2017 1,040 1.4 0.08 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 10/10/2017 1,050 1.4 0 29,733 251 18 2 3,328 0.3 0.2 255.7 10.7 10/11/2017 1,030 1.4 0 29,166 251 18 2 3,216 0.3 0.2 251.8 10.5 10/12/2017 957 1.3 0 27,099 251 18 2 2,820 0.3 0.2 237.7 9.9 10/13/2017 974 1.4 0 27,581 251 18 2 2,933 0.3 0.2 242.9 10.1 10/14/2017 986 1.4 0 27,920 251 18 2 2,990 0.3 0.2 244.6 10.2 10/15/2017 907 1.3 0 25,683 251 18 2 2,536 0.4 0.2 225.5 9.4 10/16/2017 841 1.2 0.09 23,814 251 18 2 2,135 0.4 0.3 204.8 8.5 10/17/2017 839 1.2 0.01 23,758 251 18 2 2,135 0.4 0.3 205.2 8.6 10/18/2017 814 1.2 0 23,050 251 18 2 1,962 0.4 0.3 194.4 8.1 10/19/2017 780 1.1 0 22,087 251 18 2 1,730 0.5 0.3 179.0 7.5 10/20/2017 771 1.1 0 21,832 251 18 2 1,672 0.5 0.3 175.0 7.3 10/21/2017 770 1.1 0 21,804 251 18 2 1,672 0.5 0.3 175.2 7.3 10/22/2017 761 1.1 0 21,549 251 18 2 1,614 0.5 0.3 171.1 7.1 10/23/2017 741 1.1 0.15 20,983 251 18 2 1,498 0.5 0.3 163.1 6.8 10/24/2017 928 1.3 0.01 26,278 251 18 2 2,650 0.4 0.2 230.3 9.6 10/25/2017 1,370 1.7 0 38,794 251 18 2 4,949 0.3 0.2 291.4 12.1 10/26/2017 1,360 1.7 0 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 10/27/2017 1,190 1.6 0 33,697 251 18 2 4,109 0.3 0.2 278.5 11.6 10/28/2017 1,050 1.4 0.73 29,733 251 18 2 3,328 0.3 0.2 255.7 10.7 10/29/2017 1,250 1.6 0.03 35,396 251 18 2 4,388 0.3 0.2 283.2 11.8 10/30/2017 1,220 1.6 0 34,547 251 18 2 4,221 0.3 0.2 279.1 11.6 10/31/2017 1,040 1.4 0 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 11/1/2017 900 1.3 0 25,485 251 18 2 2,479 0.4 0.2 222.2 9.3 11/2/2017 803 1.2 0 22,738 251 18 2 1,904 0.4 0.3 191.3 8.0 11/3/2017 776 1.1 0 21,974 251 18 2 1,730 0.4 0.3 179.9 7.5 11/4/2017 792 1.2 0 22,427 251 18 2 1,846 0.4 0.3 188.0 7.8 11/5/2017 755 1.1 0 21,379 251 18 2 1,556 0.5 0.3 166.3 6.9 11/6/2017 756 1.1 0 21,408 251 18 2 1,556 0.5 0.3 166.1 6.9 11/7/2017 792 1.2 0 22,427 251 18 2 1,846 0.4 0.3 188.0 7.8 11/8/2017 804 1.2 0.03 22,767 251 18 2 1,904 0.4 0.3 191.0 8.0 11/9/2017 819 1.2 0.22 23,191 251 18 2 2,020 0.4 0.3 198.9 8.3 11/10/2017 881 1.3 0.01 24,947 251 18 2 2,364 0.4 0.3 216.5 9.0 11/11/2017 897 1.3 0 25,400 251 18 2 2,479 0.4 0.2 222.9 9.3 11/12/2017 874 1.3 0 24,749 251 18 2 2,364 0.4 0.3 218.2 9.1 11/13/2017 863 1.2 0.14 24,437 251 18 2 2,250 0.4 0.3 210.3 8.8 11/14/2017 899 1.3 0 25,457 251 18 2 2,479 0.4 0.2 222.4 9.3 11/15/2017 955 1.3 0 27,043 251 18 2 2,820 0.3 0.2 238.2 9.9 11/16/2017 973 1.4 0 27,552 251 18 2 2,933 0.3 0.2 243.2 10.1 Page 8 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 11/17/2017 917 1.3 0 25,967 251 18 2 2,593 0.4 0.2 228.1 9.5 11/18/2017 854 1.2 0 24,183 251 18 2 2,192 0.4 0.3 207.1 8.6 11/19/2017 856 1.2 0.06 24,239 251 18 2 2,250 0.4 0.3 212.0 8.8 11/20/2017 856 1.2 0 24,239 251 18 2 2,250 0.4 0.3 212.0 8.8 11/21/2017 832 1.2 0 23,560 251 18 2 2,077 0.4 0.3 201.4 8.4 11/22/2017 829 1.2 0.03 23,475 251 18 2 2,077 0.4 0.3 202.1 8.4 11/23/2017 867 1.2 0 24,551 251 18 2 2,307 0.4 0.3 214.6 8.9 11/24/2017 890 1.3 0 25,202 251 18 2 2,421 0.4 0.3 219.5 9.1 11/25/2017 863 1.2 0 24,437 251 18 2 2,250 0.4 0.3 210.3 8.8 11/26/2017 830 1.2 0 23,503 251 18 2 2,077 0.4 0.3 201.9 8.4 11/27/2017 799 1.2 0 22,625 251 18 2 1,846 0.4 0.3 186.4 7.8 11/28/2017 797 1.2 0 22,569 251 18 2 1,846 0.4 0.3 186.9 7.8 11/29/2017 793 1.2 0 22,455 251 18 2 1,846 0.4 0.3 187.8 7.8 11/30/2017 790 1.2 0 22,370 251 18 2 1,788 0.4 0.3 182.6 7.6 12/1/2017 814 1.2 0 23,050 251 18 2 1,962 0.4 0.3 194.4 8.1 12/2/2017 803 1.2 0.09 22,738 251 18 2 1,904 0.4 0.3 191.3 8.0 12/3/2017 792 1.2 0.01 22,427 251 18 2 1,846 0.4 0.3 188.0 7.8 12/4/2017 797 1.2 0 22,569 251 18 2 1,846 0.4 0.3 186.9 7.8 12/5/2017 802 1.2 0 22,710 251 18 2 1,904 0.4 0.3 191.5 8.0 12/6/2017 843 1.2 0.24 23,871 251 18 2 2,135 0.4 0.3 204.3 8.5 12/7/2017 870 1.2 0.07 24,636 251 18 2 2,307 0.4 0.3 213.9 8.9 12/8/2017 994 1.4 2.43 28,147 251 18 2 3,047 0.3 0.2 247.2 10.3 12/9/2017 1,950 2.1 0.3 55,218 251 19 2 7,400 0.3 0.2 306.1 12.8 12/10/2017 2,350 2.4 0 66,545 251 19 2 8,911 0.3 0.2 305.9 12.7 12/11/2017 2,190 2.3 0 62,014 251 19 2 8,328 0.3 0.2 306.7 12.8 12/12/2017 1,850 2.1 0 52,386 251 19 2 7,055 0.3 0.2 307.6 12.8 12/13/2017 1,560 1.9 0 44,174 251 18 2 5,797 0.3 0.2 299.8 12.5 12/14/2017 1,360 1.7 0 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 12/15/2017 1,160 1.5 0 32,848 251 18 2 3,942 0.3 0.2 274.1 11.4 12/16/2017 1,040 1.4 0 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 12/17/2017 966 1.3 0 27,354 251 18 2 2,877 0.3 0.2 240.2 10.0 12/18/2017 934 1.3 0 26,448 251 18 2 2,707 0.3 0.2 233.8 9.7 12/19/2017 898 1.3 0 25,429 251 18 2 2,479 0.4 0.2 222.6 9.3 12/20/2017 962 1.3 0.57 27,241 251 18 2 2,877 0.3 0.2 241.2 10.1 12/21/2017 1,270 1.6 0 35,962 251 18 2 4,444 0.3 0.2 282.3 11.8 12/22/2017 1,460 1.8 0 41,343 251 18 2 5,344 0.3 0.2 295.3 12.3 12/23/2017 1,410 1.8 0 39,927 251 18 2 5,175 0.3 0.2 296.0 12.3 12/24/2017 1,290 1.6 0.03 36,529 251 18 2 4,556 0.3 0.2 284.9 11.9 12/25/2017 1,150 1.5 0.01 32,564 251 18 2 3,887 0.3 0.2 272.6 11.4 12/26/2017 1,050 1.4 0 29,733 251 18 2 3,384 0.3 0.2 260.0 10.8 Page 9 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 12/27/2017 1,010 1.4 0.15 28,600 251 18 2 3,103 0.3 0.2 247.8 10.3 12/28/2017 991 1.4 0 28,062 251 18 2 3,047 0.3 0.2 248.0 10.3 12/29/2017 966 1.3 0 27,354 251 18 2 2,877 0.3 0.2 240.2 10.0 12/30/2017 911 1.3 0 25,797 251 18 2 2,593 0.4 0.2 229.6 9.6 12/31/2017 897 1.3 0 25,400 251 18 2 2,479 0.4 0.2 222.9 9.3 1/1/2018 867 1.2 0 24,551 251 18 2 2,307 0.4 0.3 214.6 8.9 1/2/2018 837 1.2 0 23,701 251 18 2 2,135 0.4 0.3 205.7 8.6 1/3/2018 828 1.2 0 23,446 251 18 2 2,077 0.4 0.3 202.4 8.4 1/4/2018 823 1.2 0.01 23,305 251 18 2 2,020 0.4 0.3 197.9 8.2 1/5/2018 827 1.2 0 23,418 251 18 2 2,077 0.4 0.3 202.6 8.4 1/6/2018 814 1.2 0 23,050 251 18 2 1,962 0.4 0.3 194.4 8.1 1/7/2018 806 1.2 0 22,823 251 18 2 1,904 0.4 0.3 190.6 7.9 1/8/2018 830 1.2 0 23,503 251 18 2 2,077 0.4 0.3 201.9 8.4 1/9/2018 853 1.2 0 24,154 251 18 2 2,192 0.4 0.3 207.3 8.6 1/10/2018 854 1.2 0 24,183 251 18 2 2,192 0.4 0.3 207.1 8.6 1/11/2018 893 1.3 0.09 25,287 251 18 2 2,479 0.4 0.2 223.9 9.3 1/12/2018 933 1.3 0.22 26,420 251 18 2 2,707 0.3 0.2 234.0 9.8 1/13/2018 1,090 1.5 0 30,865 251 18 2 3,552 0.3 0.2 262.9 11.0 1/14/2018 1,300 1.7 0 36,812 251 18 2 4,612 0.3 0.2 286.2 11.9 1/15/2018 1,290 1.6 0 36,529 251 18 2 4,556 0.3 0.2 284.9 11.9 1/16/2018 1,200 1.6 0 33,980 251 18 2 4,109 0.3 0.2 276.2 11.5 1/17/2018 1,230 1.6 0.2 34,830 251 18 2 4,276 0.3 0.2 280.5 11.7 1/18/2018 1,200 1.6 0.07 33,980 251 18 2 4,109 0.3 0.2 276.2 11.5 1/19/2018 1,140 1.5 0.01 32,281 251 18 2 3,831 0.3 0.2 271.1 11.3 1/20/2018 1,060 1.4 0 30,016 251 18 2 3,384 0.3 0.2 257.5 10.7 1/21/2018 1,040 1.4 0 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 1/22/2018 1,020 1.4 0 28,883 251 18 2 3,216 0.3 0.2 254.3 10.6 1/23/2018 1,060 1.4 0.08 30,016 251 18 2 3,384 0.3 0.2 257.5 10.7 1/24/2018 1,150 1.5 0 32,564 251 18 2 3,887 0.3 0.2 272.6 11.4 1/25/2018 1,330 1.7 0 37,661 251 18 2 4,724 0.3 0.2 286.5 11.9 1/26/2018 1,830 2.1 0 51,820 251 18 2 6,940 0.3 0.2 305.9 12.7 1/27/2018 1,530 1.8 0 43,325 251 18 2 5,684 0.3 0.2 299.7 12.5 1/28/2018 1,280 1.6 1.04 36,246 251 18 2 4,556 0.3 0.2 287.1 12.0 1/29/2018 3,320 2.8 1.04 94,012 251 19 2 11,513 0.3 0.2 279.7 11.7 1/30/2018 7,650 4.5 0.03 216,624 251 21 2 21,913 0.3 0.2 231.1 9.6 1/31/2018 9,060 5.0 0 256,551 251 21 2 24,764 0.4 0.2 220.5 9.2 2/1/2018 6,040 3.9 0 171,034 251 20 2 18,220 0.3 0.2 243.3 10.1 2/2/2018 3,940 3.1 0.18 111,568 251 20 2 13,073 0.3 0.2 267.7 11.2 2/3/2018 2,930 2.6 0 82,968 251 19 2 10,087 0.3 0.2 277.7 11.6 2/4/2018 2,540 2.4 1.12 71,925 251 19 2 8,853 0.3 0.2 281.2 11.7 Page 10 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 2/5/2018 3,960 3.1 0 112,135 251 20 2 13,073 0.3 0.2 266.3 11.1 2/6/2018 6,030 3.9 0 170,751 251 20 2 18,220 0.3 0.2 243.7 10.2 2/7/2018 6,480 4.1 0.08 183,493 251 21 2 19,215 0.3 0.2 239.2 10.0 2/8/2018 4,680 3.4 0.03 132,523 251 20 2 15,016 0.3 0.2 258.8 10.8 2/9/2018 3,650 3.0 0 103,356 251 19 2 12,231 0.3 0.2 270.3 11.3 2/10/2018 3,930 3.1 0.21 111,285 251 20 2 13,013 0.3 0.2 267.1 11.1 2/11/2018 3,930 3.1 0 111,285 251 20 2 13,073 0.3 0.2 268.3 11.2 2/12/2018 3,410 2.9 0.01 96,560 251 19 2 11,572 0.3 0.2 273.8 11.4 2/13/2018 3,870 3.1 0 109,586 251 19 2 12,832 0.3 0.2 267.5 11.1 2/14/2018 4,820 3.5 0 136,487 251 20 2 15,383 0.3 0.2 257.5 10.7 2/15/2018 4,280 3.3 0 121,196 251 20 2 14,042 0.3 0.2 264.7 11.0 2/16/2018 4,030 3.1 0 114,117 251 20 2 13,315 0.3 0.2 266.5 11.1 2/17/2018 3,840 3.1 0 108,737 251 19 2 12,832 0.3 0.2 269.6 11.2 2/18/2018 3,610 3.0 0 102,224 251 19 2 12,171 0.3 0.2 272.0 11.3 2/19/2018 3,330 2.8 0.04 94,295 251 19 2 11,333 0.3 0.2 274.5 11.4 2/20/2018 3,260 2.8 0.01 92,313 251 19 2 11,155 0.3 0.2 276.0 11.5 2/21/2018 3,200 2.8 0 90,614 251 19 2 10,976 0.3 0.2 276.7 11.5 2/22/2018 3,100 2.7 0 87,782 251 19 2 10,679 0.3 0.2 277.9 11.6 2/23/2018 2,840 2.6 0 80,420 251 19 2 9,792 0.3 0.2 278.1 11.6 2/24/2018 2,080 2.1 0 58,899 251 19 2 7,170 0.3 0.2 278.1 11.6 2/25/2018 1,930 2.0 0 54,652 251 18 2 6,596 0.3 0.2 275.7 11.5 2/26/2018 1,810 1.9 0.22 51,253 251 18 2 6,139 0.3 0.2 273.6 11.4 2/27/2018 1,780 1.9 0.01 50,404 251 18 2 5,968 0.3 0.2 270.4 11.3 2/28/2018 1,730 1.9 0.07 48,988 251 18 2 5,797 0.3 0.2 270.3 11.3 3/1/2018 1,830 1.9 0.9 51,820 251 18 2 6,196 0.3 0.2 273.1 11.4 3/2/2018 2,760 2.5 0 78,154 251 19 2 9,557 0.3 0.2 279.3 11.6 3/3/2018 3,570 2.9 0 101,091 251 19 2 12,051 0.3 0.2 272.3 11.3 3/4/2018 4,610 3.4 0 130,541 251 20 2 14,894 0.3 0.2 260.6 10.9 3/5/2018 4,180 3.2 0 118,364 251 20 2 13,739 0.3 0.2 265.1 11.0 3/6/2018 3,450 2.9 0.26 97,693 251 19 2 11,692 0.3 0.2 273.4 11.4 3/7/2018 2,810 2.5 0.02 79,570 251 19 2 9,733 0.3 0.2 279.4 11.6 3/8/2018 2,440 2.3 0 69,093 251 19 2 8,503 0.3 0.2 281.1 11.7 3/9/2018 2,680 2.5 0 75,889 251 19 2 9,263 0.3 0.2 278.8 11.6 3/10/2018 3,070 2.7 0 86,933 251 19 2 10,561 0.3 0.2 277.5 11.6 3/11/2018 2,710 2.5 0.02 76,739 251 19 2 9,380 0.3 0.2 279.2 11.6 3/12/2018 2,540 2.4 0.63 71,925 251 19 2 8,794 0.3 0.2 279.3 11.6 3/13/2018 4,120 3.2 0.01 116,665 251 20 2 13,375 0.3 0.2 261.9 10.9 3/14/2018 7,530 4.5 0 213,226 251 21 2 21,535 0.3 0.2 230.7 9.6 3/15/2018 7,930 4.6 0 224,553 251 21 2 22,418 0.4 0.2 228.0 9.5 3/16/2018 7,540 4.5 0 213,509 251 21 2 21,535 0.4 0.2 230.4 9.6 Page 11 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 3/17/2018 6,180 4.0 0 174,998 251 20 2 18,530 0.3 0.2 241.9 10.1 3/18/2018 5,000 3.6 0 141,584 251 20 2 15,812 0.3 0.2 255.1 10.6 3/19/2018 4,480 3.3 0.01 126,859 251 20 2 14,528 0.3 0.2 261.6 10.9 3/20/2018 4,650 3.4 0.57 131,673 251 20 2 14,955 0.3 0.2 259.4 10.8 3/21/2018 7,350 4.4 0.1 208,129 251 21 2 21,094 0.3 0.2 231.5 9.6 3/22/2018 10,900 5.6 0 308,654 251 22 2 28,540 0.4 0.3 211.2 8.8 3/23/2018 11,000 5.6 0 311,485 251 22 2 28,797 0.4 0.3 211.2 8.8 3/24/2018 8,390 4.8 0.43 237,578 251 21 2 23,304 0.4 0.2 224.1 9.3 3/25/2018 6,990 4.3 0.21 197,935 251 21 2 20,341 0.3 0.2 234.7 9.8 3/26/2018 7,550 4.5 0 213,792 251 21 2 21,598 0.3 0.2 230.8 9.6 3/27/2018 7,950 4.6 0.01 225,119 251 21 2 22,418 0.4 0.2 227.5 9.5 3/28/2018 7,540 4.5 0 213,509 251 21 2 21,535 0.4 0.2 230.4 9.6 3/29/2018 7,250 4.4 0 205,297 251 21 2 20,906 0.3 0.2 232.6 9.7 3/30/2018 6,730 4.2 0 190,572 251 21 2 19,778 0.3 0.2 237.1 9.9 3/31/2018 5,530 3.8 0 156,592 251 20 2 17,043 0.3 0.2 248.6 10.4 4/1/2018 3,900 3.1 0 110,436 251 20 2 12,953 0.3 0.2 267.9 11.2 4/2/2018 3,440 2.9 0 97,410 251 19 2 11,692 0.3 0.2 274.2 11.4 4/3/2018 2,880 2.6 0 81,553 251 19 2 9,969 0.3 0.2 279.2 11.6 4/4/2018 2,360 2.3 0 66,828 251 19 2 8,211 0.3 0.2 280.7 11.7 4/5/2018 2,200 2.2 0 62,297 251 19 2 7,574 0.3 0.2 277.7 11.6 4/6/2018 1,990 2.0 0 56,351 251 18 2 6,825 0.3 0.2 276.7 11.5 4/7/2018 1,940 2.0 0.68 54,935 251 18 2 6,653 0.3 0.2 276.6 11.5 4/8/2018 2,440 2.3 0.25 69,093 251 19 2 8,444 0.3 0.2 279.2 11.6 4/9/2018 3,280 2.8 0.04 92,879 251 19 2 11,214 0.3 0.2 275.8 11.5 4/10/2018 4,250 3.2 0 120,347 251 20 2 13,860 0.3 0.2 263.1 11.0 4/11/2018 5,210 3.6 0 147,531 251 20 2 16,365 0.3 0.2 253.4 10.6 4/12/2018 4,640 3.4 0 131,390 251 20 2 14,955 0.3 0.2 260.0 10.8 4/13/2018 3,450 2.9 0 97,693 251 19 2 11,632 0.3 0.2 272.0 11.3 4/14/2018 2,260 2.2 0 63,996 251 19 2 7,805 0.3 0.2 278.6 11.6 4/15/2018 2,000 2.0 1.06 56,634 251 18 2 6,825 0.3 0.2 275.3 11.5 4/16/2018 5,330 3.5 0 150,929 251 20 2 15,322 0.3 0.2 231.9 9.7 4/17/2018 15,300 7.7 0 433,248 251 24 2 42,120 0.4 0.2 222.1 9.3 4/18/2018 13,900 7.7 0 393,604 251 24 2 42,316 0.3 0.2 245.6 10.2 4/19/2018 13,100 7.4 0 370,951 251 24 2 40,355 0.3 0.2 248.5 10.4 4/20/2018 11,800 6.2 0 334,139 251 23 2 32,608 0.4 0.2 222.9 9.3 4/21/2018 9,910 5.3 0 280,620 251 22 2 26,488 0.4 0.3 215.6 9.0 4/22/2018 8,180 4.7 0 231,632 251 21 2 22,924 0.4 0.2 226.1 9.4 4/23/2018 7,570 4.5 0.23 214,359 251 21 2 21,598 0.4 0.2 230.1 9.6 4/24/2018 6,600 4.1 1.18 186,891 251 21 2 19,465 0.3 0.2 237.9 9.9 4/25/2018 7,670 4.5 0 217,190 251 21 2 21,724 0.4 0.2 228.5 9.5 Page 12 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 4/26/2018 14,600 7.3 0 413,426 251 24 2 39,441 0.4 0.3 217.9 9.1 4/27/2018 13,700 7.8 0.13 387,941 251 24 2 42,839 0.3 0.2 252.2 10.5 4/28/2018 12,000 6.3 0 339,802 251 23 2 33,191 0.4 0.2 223.1 9.3 4/29/2018 12,000 5.9 0 339,802 251 22 2 30,538 0.4 0.3 205.3 8.6 4/30/2018 9,520 5.1 0 269,576 251 22 2 25,721 0.4 0.3 217.9 9.1 5/1/2018 8,010 4.6 0 226,818 251 21 2 22,544 0.4 0.2 227.0 9.5 5/2/2018 7,290 4.4 0 206,430 251 21 2 21,031 0.3 0.2 232.7 9.7 5/3/2018 6,830 4.2 0 193,404 251 21 2 19,965 0.3 0.2 235.8 9.8 5/4/2018 6,690 4.2 0 189,440 251 21 2 19,653 0.3 0.2 237.0 9.9 5/5/2018 5,470 3.7 0 154,893 251 20 2 16,920 0.3 0.2 249.5 10.4 5/6/2018 4,220 3.2 0.04 119,497 251 20 2 13,860 0.3 0.2 264.9 11.0 5/7/2018 4,000 3.1 0 113,267 251 20 2 13,255 0.3 0.2 267.3 11.1 5/8/2018 3,560 2.9 0 100,808 251 19 2 11,991 0.3 0.2 271.7 11.3 5/9/2018 2,730 2.5 0 77,305 251 19 2 9,439 0.3 0.2 278.9 11.6 5/10/2018 2,130 2.1 0.08 60,315 251 19 2 7,343 0.3 0.2 278.1 11.6 5/11/2018 1,850 1.9 0 52,386 251 18 2 6,253 0.3 0.2 272.6 11.4 5/12/2018 1,420 1.6 0 40,210 251 18 2 4,444 0.3 0.2 252.5 10.5 5/13/2018 1,350 1.6 0 38,228 251 18 2 4,109 0.3 0.2 245.5 10.2 5/14/2018 1,290 1.5 0 36,529 251 18 2 3,831 0.3 0.2 239.6 10.0 5/15/2018 1,280 1.5 0 36,246 251 18 2 3,831 0.3 0.2 241.4 10.1 5/16/2018 1,280 1.5 0.25 36,246 251 18 2 3,831 0.3 0.2 241.4 10.1 5/17/2018 1,490 1.7 0.8 42,192 251 18 2 4,780 0.3 0.2 258.8 10.8 5/18/2018 2,030 2.1 0.01 57,483 251 18 2 6,940 0.3 0.2 275.8 11.5 5/19/2018 2,930 2.6 0.23 82,968 251 19 2 10,087 0.3 0.2 277.7 11.6 5/20/2018 4,260 3.2 0 120,630 251 20 2 13,799 0.3 0.2 261.3 10.9 5/21/2018 7,970 4.6 0 225,685 251 21 2 22,481 0.4 0.2 227.5 9.5 5/22/2018 7,440 4.4 0 210,677 251 21 2 21,346 0.3 0.2 231.4 9.6 5/23/2018 7,830 4.6 0.07 221,721 251 21 2 22,165 0.4 0.2 228.4 9.5 5/24/2018 8,620 4.8 1.86 244,091 251 21 2 23,874 0.4 0.2 223.4 9.3 5/25/2018 7,540 4.5 0 213,509 251 21 2 21,661 0.3 0.2 231.7 9.7 5/26/2018 5,430 3.7 0.02 153,760 251 20 2 16,981 0.3 0.2 252.3 10.5 5/27/2018 3,330 2.9 0 94,295 251 19 2 11,632 0.3 0.2 281.8 11.7 5/28/2018 2,520 2.4 0.58 71,358 251 19 2 9,146 0.3 0.2 292.8 12.2 5/29/2018 2,910 2.7 0.13 82,402 251 19 2 10,501 0.3 0.2 291.1 12.1 5/30/2018 4,410 3.4 0 124,877 251 20 2 14,955 0.3 0.2 273.6 11.4 5/31/2018 6,070 4.1 0 171,883 251 20 2 18,966 0.3 0.2 252.0 10.5 6/1/2018 7,590 4.6 0 214,925 251 21 2 22,481 0.3 0.2 238.9 10.0 6/2/2018 5,750 4.0 0 162,822 251 20 2 18,406 0.3 0.2 258.2 10.8 6/3/2018 4,240 3.4 0 120,063 251 20 2 14,650 0.3 0.2 278.7 11.6 6/4/2018 2,970 2.8 0 84,101 251 19 2 10,976 0.3 0.2 298.1 12.4 Page 13 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 6/5/2018 2,290 2.4 0 64,846 251 19 2 8,678 0.3 0.2 305.7 12.7 6/6/2018 1,800 2.0 0 50,970 251 18 2 6,825 0.3 0.2 305.9 12.7 6/7/2018 1,510 1.8 0 42,758 251 18 2 5,627 0.3 0.2 300.6 12.5 6/8/2018 1,270 1.6 0 35,962 251 18 2 4,444 0.3 0.2 282.3 11.8 6/9/2018 1,140 1.5 0.02 32,281 251 18 2 3,831 0.3 0.2 271.1 11.3 6/10/2018 1,040 1.4 0 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 6/11/2018 1,060 1.4 1.81 30,016 251 18 2 3,384 0.3 0.2 257.5 10.7 6/12/2018 1,770 2.0 0.73 50,121 251 18 2 6,653 0.3 0.2 303.2 12.6 6/13/2018 2,000 2.2 0 56,634 251 19 2 7,574 0.3 0.2 305.5 12.7 6/14/2018 1,510 1.8 0 42,758 251 18 2 5,570 0.3 0.2 297.6 12.4 6/15/2018 1,270 1.6 0 35,962 251 18 2 4,500 0.3 0.2 285.8 11.9 6/16/2018 1,130 1.5 0 31,998 251 18 2 3,775 0.3 0.2 269.5 11.2 6/17/2018 1,040 1.4 0 29,450 251 18 2 3,328 0.3 0.2 258.1 10.8 6/18/2018 971 1.4 0.35 27,496 251 18 2 2,933 0.3 0.2 243.7 10.2 6/19/2018 941 1.3 0 26,646 251 18 2 2,763 0.3 0.2 236.9 9.9 6/20/2018 907 1.3 0 25,683 251 18 2 2,536 0.4 0.2 225.5 9.4 6/21/2018 999 1.4 0 28,289 251 18 2 3,047 0.3 0.2 246.0 10.2 6/22/2018 1,060 1.4 0 30,016 251 18 2 3,440 0.3 0.2 261.8 10.9 6/23/2018 1,020 1.4 0 28,883 251 18 2 3,159 0.3 0.2 249.9 10.4 6/24/2018 940 1.3 0.07 26,618 251 18 2 2,763 0.3 0.2 237.1 9.9 6/25/2018 1,040 1.4 0.45 29,450 251 18 2 3,272 0.3 0.2 253.8 10.6 6/26/2018 1,340 1.7 0.76 37,945 251 18 2 4,780 0.3 0.2 287.8 12.0 6/27/2018 2,170 2.3 0.01 61,448 251 19 2 8,270 0.3 0.2 307.4 12.8 6/28/2018 1,990 2.2 0 56,351 251 19 2 7,574 0.3 0.2 307.0 12.8 6/29/2018 1,650 1.9 0 46,723 251 18 2 6,196 0.3 0.2 302.9 12.6 6/30/2018 1,390 1.7 0 39,360 251 18 2 5,062 0.3 0.2 293.8 12.2 7/1/2018 1,230 1.6 0 34,830 251 18 2 4,276 0.3 0.2 280.5 11.7 7/2/2018 1,090 1.5 0 30,865 251 18 2 3,552 0.3 0.2 262.9 11.0 7/3/2018 965 1.3 0 27,326 251 18 2 2,877 0.3 0.2 240.5 10.0 7/4/2018 881 1.3 0 24,947 251 18 2 2,364 0.4 0.3 216.5 9.0 7/5/2018 857 1.2 0.38 24,268 251 18 2 2,250 0.4 0.3 211.7 8.8 7/6/2018 931 1.3 0.01 26,363 251 18 2 2,707 0.3 0.2 234.5 9.8 7/7/2018 1,120 1.5 0.16 31,715 251 18 2 3,664 0.3 0.2 263.9 11.0 7/8/2018 1,670 2.0 0 47,289 251 18 2 6,310 0.3 0.2 304.8 12.7 7/9/2018 1,700 2.0 0 48,139 251 18 2 6,424 0.3 0.2 304.8 12.7 7/10/2018 1,570 1.9 0 44,457 251 18 2 5,854 0.3 0.2 300.8 12.5 7/11/2018 1,190 1.6 0 33,697 251 18 2 4,053 0.3 0.2 274.8 11.4 7/12/2018 998 1.4 0.12 28,260 251 18 2 3,047 0.3 0.2 246.2 10.3 7/13/2018 957 1.3 0 27,099 251 18 2 2,820 0.3 0.2 237.7 9.9 7/14/2018 851 1.2 0 24,098 251 18 2 2,192 0.4 0.3 207.8 8.7 Page 14 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 7/15/2018 799 1.2 0 22,625 251 18 2 1,846 0.4 0.3 186.4 7.8 7/16/2018 811 1.2 0 22,965 251 18 2 1,962 0.4 0.3 195.1 8.1 7/17/2018 802 1.2 0.07 22,710 251 18 2 1,904 0.4 0.3 191.5 8.0 7/18/2018 1,670 1.9 0 47,289 251 18 2 6,025 0.3 0.2 291.0 12.1 7/19/2018 1,700 2.0 0 48,139 251 18 2 6,367 0.3 0.2 302.1 12.6 7/20/2018 1,100 1.5 0.01 31,149 251 18 2 3,608 0.3 0.2 264.6 11.0 7/21/2018 893 1.3 0.01 25,287 251 18 2 2,479 0.4 0.2 223.9 9.3 7/22/2018 1,400 1.7 0.01 39,644 251 18 2 4,837 0.3 0.2 278.7 11.6 7/23/2018 3,880 3.2 0 109,869 251 20 2 13,436 0.3 0.2 279.3 11.6 7/24/2018 6,730 4.3 0.02 190,572 251 21 2 20,592 0.3 0.2 246.8 10.3 7/25/2018 4,670 3.5 0.09 132,240 251 20 2 15,751 0.3 0.2 272.1 11.3 7/26/2018 3,900 3.2 0 110,436 251 20 2 13,739 0.3 0.2 284.2 11.8 7/27/2018 3,040 2.8 0 86,083 251 19 2 11,214 0.3 0.2 297.6 12.4 7/28/2018 2,720 2.6 1.96 77,022 251 19 2 10,205 0.3 0.2 302.7 12.6 7/29/2018 3,270 2.9 0.06 92,596 251 19 2 11,931 0.3 0.2 294.3 12.3 7/30/2018 3,520 3.0 0.78 99,675 251 19 2 12,652 0.3 0.2 289.9 12.1 7/31/2018 4,160 3.3 0.19 117,798 251 20 2 14,468 0.3 0.2 280.5 11.7 8/1/2018 3,820 3.2 0.43 108,170 251 20 2 13,557 0.3 0.2 286.3 11.9 8/2/2018 3,720 3.1 0.66 105,339 251 20 2 13,255 0.3 0.2 287.4 12.0 8/3/2018 3,510 3.0 0.46 99,392 251 19 2 12,652 0.3 0.2 290.8 12.1 8/4/2018 8,470 4.9 0.59 239,844 251 21 2 24,192 0.4 0.2 230.4 9.6 8/5/2018 9,730 5.3 0.08 275,523 251 22 2 26,872 0.4 0.2 222.8 9.3 8/6/2018 8,560 4.9 0.01 242,392 251 21 2 24,510 0.3 0.2 231.0 9.6 8/7/2018 8,030 4.8 0 227,384 251 21 2 23,430 0.3 0.2 235.4 9.8 8/8/2018 7,660 4.6 0.11 216,907 251 21 2 22,607 0.3 0.2 238.1 9.9 8/9/2018 8,590 4.9 0 243,242 251 21 2 24,510 0.4 0.2 230.2 9.6 8/10/2018 9,930 5.4 0.12 281,186 251 22 2 27,192 0.4 0.2 220.9 9.2 8/11/2018 6,660 4.3 0.01 188,590 251 21 2 20,466 0.3 0.2 247.9 10.3 8/12/2018 7,350 4.5 0.73 208,129 251 21 2 21,913 0.3 0.2 240.5 10.0 8/13/2018 10,500 5.5 0.43 297,327 251 22 2 28,283 0.4 0.3 217.3 9.1 8/14/2018 12,400 6.1 0 351,129 251 23 2 32,025 0.4 0.3 208.3 8.7 8/15/2018 12,700 6.6 0 359,624 251 23 2 35,270 0.4 0.2 224.0 9.3 8/16/2018 11,600 6.0 0 328,475 251 22 2 31,119 0.4 0.3 216.4 9.0 8/17/2018 9,160 5.1 0.27 259,382 251 22 2 25,721 0.4 0.2 226.5 9.4 8/18/2018 6,580 4.3 0.16 186,325 251 21 2 20,216 0.3 0.2 247.8 10.3 8/19/2018 5,850 4.0 0.17 165,654 251 20 2 18,468 0.3 0.2 254.7 10.6 8/20/2018 11,600 5.9 0.55 328,475 251 22 2 30,473 0.4 0.3 211.9 8.8 8/21/2018 14,000 7.0 0.01 396,436 251 23 2 37,549 0.4 0.3 216.4 9.0 8/22/2018 14,300 8.1 0 404,931 251 24 2 44,670 0.3 0.2 252.0 10.5 8/23/2018 11,700 6.3 0 331,307 251 23 2 33,256 0.4 0.2 229.3 9.6 Page 15 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 8/24/2018 10,900 5.7 0 308,654 251 22 2 29,119 0.4 0.3 215.5 9.0 8/25/2018 7,430 4.6 0 210,394 251 21 2 22,039 0.3 0.2 239.3 10.0 8/26/2018 4,220 3.4 0 119,497 251 20 2 14,589 0.3 0.2 278.9 11.6 8/27/2018 3,160 2.9 0 89,481 251 19 2 11,572 0.3 0.2 295.4 12.3 8/28/2018 2,070 2.2 0 58,616 251 19 2 7,863 0.3 0.2 306.4 12.8 8/29/2018 1,600 1.9 0 45,307 251 18 2 5,968 0.3 0.2 300.9 12.5 8/30/2018 1,440 1.8 0 40,776 251 18 2 5,231 0.3 0.2 293.0 12.2 8/31/2018 1,360 1.7 0 38,511 251 18 2 4,893 0.3 0.2 290.2 12.1 9/1/2018 1,350 1.7 38,228 251 18 2 4,893 0.3 0.2 292.4 12.2 9/2/2018 1,580 1.9 44,741 251 18 2 5,911 0.3 0.2 301.8 12.6 9/3/2018 1,770 2.0 50,121 251 18 2 6,653 0.3 0.2 303.2 12.6 9/4/2018 1,830 2.1 51,820 251 18 2 6,940 0.3 0.2 305.9 12.7 9/5/2018 1,670 1.9 47,289 251 18 2 6,253 0.3 0.2 302.0 12.6 9/6/2018 1,430 1.8 40,493 251 18 2 5,231 0.3 0.2 295.1 12.3 9/7/2018 1,300 1.7 36,812 251 18 2 4,612 0.3 0.2 286.2 11.9 9/8/2018 1,230 1.6 34,830 251 18 2 4,276 0.3 0.2 280.5 11.7 9/9/2018 1,320 1.7 37,378 251 18 2 4,724 0.3 0.2 288.7 12.0 9/10/2018 1,390 1.7 39,360 251 18 2 5,062 0.3 0.2 293.8 12.2 9/11/2018 1,580 1.9 44,741 251 18 2 5,911 0.3 0.2 301.8 12.6 9/12/2018 2,390 2.4 67,677 251 19 2 9,028 0.3 0.2 304.7 12.7 9/13/2018 2,880 2.7 81,553 251 19 2 10,738 0.3 0.2 300.8 12.5 9/14/2018 3,450 3.0 97,693 251 19 2 12,411 0.3 0.2 290.2 12.1 9/15/2018 14,200 8.0 402,099 251 24 2 44,343 0.3 0.2 251.9 10.5 9/16/2018 35,400 21.2 1,002,416 251 38 2 123,534 0.3 0.2 281.5 11.7 9/17/2018 60,500 31.0 1,713,169 251 47 2 164,735 0.4 0.3 219.6 9.2 9/18/2018 77,500 36.0 2,194,556 251 52 2 178,236 0.4 0.3 185.5 7.7 9/19/2018 83,200 38.3 2,355,962 251 55 2 182,750 0.5 0.3 177.2 7.4 9/20/2018 79,100 38.4 2,239,863 251 55 2 182,938 0.4 0.3 186.6 7.8 9/21/2018 64,200 36.4 0 1,817,942 251 53 2 179,125 0.4 0.2 225.1 9.4 9/22/2018 38,500 31.2 0 1,090,199 251 48 2 165,282 0.2 0.2 346.3 14.4 9/23/2018 17,000 23.3 0 481,386 251 40 2 133,677 0.1 0.1 634.3 26.4 9/24/2018 8,520 15.2 0 241,260 251 32 2 89,797 0.1 0.1 850.2 35.4 9/25/2018 9,940 9.3 0 281,469 251 26 2 53,034 0.2 0.1 430.4 17.9 9/26/2018 8,740 6.4 0.35 247,489 251 23 2 33,645 0.3 0.2 310.5 12.9 9/27/2018 10,500 5.7 0.13 297,327 251 22 2 29,634 0.4 0.2 227.7 9.5 9/28/2018 12,300 7.0 0.28 348,297 251 23 2 37,679 0.3 0.2 247.1 10.3 9/29/2018 15,000 8.8 0 424,753 251 25 2 49,444 0.3 0.2 265.9 11.1 9/30/2018 15,300 9.2 0 433,248 251 26 2 52,186 0.3 0.2 275.1 11.5 10/1/2018 14,300 8.6 0 404,931 251 25 2 48,006 0.3 0.2 270.8 11.3 10/2/2018 13,100 7.8 0 370,951 251 24 2 43,166 0.3 0.2 265.8 11.1 Page 16 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 10/3/2018 12,100 7.2 0 342,634 251 24 2 38,919 0.3 0.2 259.5 10.8 10/4/2018 11,400 6.7 0 322,812 251 23 2 35,855 0.3 0.2 253.7 10.6 10/5/2018 11,500 6.4 0 325,644 251 23 2 33,840 0.3 0.2 237.4 9.9 10/6/2018 11,900 6.1 0 336,970 251 23 2 31,830 0.4 0.3 215.8 9.0 10/7/2018 11,500 5.8 0 325,644 251 22 2 30,215 0.4 0.3 211.9 8.8 10/8/2018 11,100 5.7 0 314,317 251 22 2 29,506 0.4 0.3 214.4 8.9 10/9/2018 10,800 5.6 0 305,822 251 22 2 28,862 0.4 0.3 215.6 9.0 10/10/2018 6,320 4.1 0.07 178,962 251 21 2 19,340 0.3 0.2 246.9 10.3 10/11/2018 2,820 2.7 0.67 79,854 251 19 2 10,501 0.3 0.2 300.4 12.5 10/12/2018 8,900 4.9 0 252,020 251 21 2 24,319 0.4 0.2 220.4 9.2 10/13/2018 16,200 9.1 0 458,733 251 26 2 51,729 0.3 0.2 257.6 10.7 10/14/2018 16,200 9.7 0 458,733 251 26 2 55,184 0.3 0.2 274.8 11.4 10/15/2018 12,500 7.8 0 353,961 251 24 2 42,970 0.3 0.2 277.3 11.6 10/16/2018 11,400 6.0 0.24 322,812 251 22 2 31,313 0.4 0.2 221.6 9.2 10/17/2018 12,300 6.8 0.03 348,297 251 23 2 36,246 0.3 0.2 237.7 9.9 10/18/2018 12,400 7.2 0 351,129 251 24 2 39,180 0.3 0.2 254.9 10.6 10/19/2018 11,900 7.0 0 336,970 251 23 2 37,810 0.3 0.2 256.3 10.7 10/20/2018 11,200 6.5 0 317,149 251 23 2 34,749 0.3 0.2 250.3 10.4 10/21/2018 11,700 6.0 0 331,307 251 22 2 31,378 0.4 0.3 216.3 9.0 10/22/2018 11,400 5.8 0 322,812 251 22 2 30,086 0.4 0.3 212.9 8.9 10/23/2018 10,300 5.5 0 291,664 251 22 2 28,026 0.4 0.3 219.5 9.1 10/24/2018 8,600 5.0 0 243,525 251 21 2 24,573 0.3 0.2 230.5 9.6 10/25/2018 7,530 4.6 0 213,226 251 21 2 22,355 0.3 0.2 239.5 10.0 10/26/2018 6,910 4.4 1.05 195,669 251 21 2 20,969 0.3 0.2 244.8 10.2 10/27/2018 9,040 5.1 0.02 255,984 251 22 2 25,402 0.4 0.2 226.7 9.4 10/28/2018 14,800 7.8 0 419,089 251 24 2 43,100 0.3 0.2 234.9 9.8 10/29/2018 14,600 8.6 0 413,426 251 25 2 48,136 0.3 0.2 266.0 11.1 10/30/2018 11,500 6.9 0 325,644 251 23 2 37,223 0.3 0.2 261.1 10.9 10/31/2018 10,300 5.6 0 291,664 251 22 2 28,476 0.4 0.2 223.0 9.3 11/1/2018 8,640 5.0 0.11 244,658 251 21 2 24,701 0.3 0.2 230.6 9.6 11/2/2018 6,460 4.2 0.04 182,927 251 21 2 19,965 0.3 0.2 249.3 10.4 11/3/2018 4,960 3.7 0 140,452 251 20 2 16,488 0.3 0.2 268.2 11.2 11/4/2018 6,150 4.1 0.08 174,149 251 21 2 19,340 0.3 0.2 253.7 10.6 11/5/2018 5,970 4.1 0.18 169,052 251 20 2 18,904 0.3 0.2 255.4 10.6 11/6/2018 7,320 4.5 0.04 207,279 251 21 2 21,787 0.3 0.2 240.1 10.0 11/7/2018 12,500 6.2 0.05 353,961 251 23 2 32,478 0.4 0.3 209.6 8.7 11/8/2018 10,400 5.5 0.3 294,495 251 22 2 28,219 0.4 0.3 218.9 9.1 11/9/2018 8,940 5.1 0.04 253,153 251 21 2 25,274 0.4 0.2 228.1 9.5 11/10/2018 9,150 5.1 0.01 259,099 251 22 2 25,721 0.4 0.2 226.8 9.4 11/11/2018 8,660 5.0 0 245,224 251 21 2 24,701 0.4 0.2 230.1 9.6 Page 17 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 11/12/2018 8,920 5.1 1.5 252,586 251 21 2 25,274 0.4 0.2 228.6 9.5 11/13/2018 19,600 10.4 1.57 555,010 251 27 2 59,859 0.3 0.2 246.4 10.3 11/14/2018 37,400 21.6 0.07 1,059,050 251 38 2 125,662 0.3 0.2 271.0 11.3 11/15/2018 36,400 23.7 0.64 1,030,733 251 40 2 135,558 0.3 0.2 300.4 12.5 11/16/2018 39,200 25.0 0 1,110,020 251 41 2 141,602 0.3 0.2 291.4 12.1 11/17/2018 35,300 24.7 0 999,585 251 41 2 140,223 0.3 0.2 320.4 13.4 11/18/2018 27,100 21.7 0 767,387 251 38 2 125,863 0.2 0.1 374.6 15.6 11/19/2018 18,200 16.9 0.11 515,367 251 33 2 100,017 0.2 0.1 443.3 18.5 11/20/2018 15,900 12.0 0 450,238 251 28 2 70,262 0.2 0.2 356.5 14.9 11/21/2018 16,700 10.6 0 472,891 251 27 2 61,541 0.3 0.2 297.3 12.4 11/22/2018 15,100 9.4 0 427,584 251 26 2 53,686 0.3 0.2 286.8 12.0 11/23/2018 11,500 7.1 0 325,644 251 24 2 38,592 0.3 0.2 270.7 11.3 11/24/2018 11,500 6.2 1.09 325,644 251 23 2 32,672 0.4 0.2 229.2 9.5 11/25/2018 13,200 7.3 0 373,782 251 24 2 40,029 0.3 0.2 244.6 10.2 11/26/2018 14,800 8.6 0 419,089 251 25 2 48,071 0.3 0.2 262.0 10.9 11/27/2018 15,400 9.1 0 436,079 251 26 2 51,403 0.3 0.2 269.3 11.2 11/28/2018 15,300 9.1 0 433,248 251 26 2 51,599 0.3 0.2 272.0 11.3 11/29/2018 15,100 9.0 0 427,584 251 25 2 50,554 0.3 0.2 270.1 11.3 11/30/2018 15,500 9.2 0 438,911 251 26 2 52,447 0.3 0.2 273.0 11.4 12/1/2018 15,700 9.4 1.11 444,574 251 26 2 53,425 0.3 0.2 274.5 11.4 12/2/2018 17,300 10.4 0.01 489,881 251 27 2 59,989 0.3 0.2 279.7 11.7 12/3/2018 18,700 11.7 0 529,525 251 28 2 68,158 0.3 0.2 294.0 12.3 12/4/2018 18,900 12.0 0 535,188 251 28 2 70,325 0.3 0.2 300.2 12.5 12/5/2018 18,100 11.5 0 512,535 251 28 2 67,199 0.3 0.2 299.5 12.5 12/6/2018 17,200 10.7 0 487,050 251 27 2 62,057 0.3 0.2 291.0 12.1 12/7/2018 13,600 8.6 0 385,109 251 25 2 48,267 0.3 0.2 286.3 11.9 12/8/2018 9,960 5.7 0.39 282,036 251 22 2 29,506 0.3 0.2 239.0 10.0 12/9/2018 10,400 5.4 1.56 294,495 251 22 2 27,641 0.4 0.3 214.4 8.9 12/10/2018 17,000 9.4 0.35 481,386 251 26 2 53,230 0.3 0.2 252.6 10.5 12/11/2018 23,300 15.0 0.02 659,783 251 31 2 88,892 0.3 0.2 307.8 12.8 12/12/2018 21,500 15.1 0 608,812 251 32 2 89,375 0.2 0.2 335.3 14.0 12/13/2018 17,900 12.6 0 506,872 251 29 2 73,746 0.2 0.2 332.3 13.8 12/14/2018 13,600 8.9 1.49 385,109 251 25 2 50,032 0.3 0.2 296.8 12.4 12/15/2018 15,900 9.6 0.43 450,238 251 26 2 54,533 0.3 0.2 276.7 11.5 12/16/2018 22,000 14.1 0.01 622,971 251 31 2 83,529 0.3 0.2 306.3 12.8 12/17/2018 21,400 14.7 0 605,981 251 31 2 87,014 0.2 0.2 328.0 13.7 12/18/2018 19,200 13.4 0 543,683 251 30 2 78,764 0.2 0.2 330.9 13.8 12/19/2018 16,500 10.9 0 467,228 251 27 2 63,347 0.3 0.2 309.7 12.9 12/20/2018 14,100 8.9 0.39 399,268 251 25 2 50,097 0.3 0.2 286.6 11.9 12/21/2018 12,600 7.6 0.15 356,792 251 24 2 41,662 0.3 0.2 266.7 11.1 Page 18 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 12/22/2018 18,400 10.9 0 521,030 251 27 2 63,476 0.3 0.2 278.3 11.6 12/23/2018 20,400 13.0 0 577,664 251 29 2 76,514 0.3 0.2 302.6 12.6 12/24/2018 19,400 12.8 0 549,347 251 29 2 75,321 0.3 0.2 313.2 13.0 12/25/2018 17,200 11.0 0 487,050 251 27 2 63,862 0.3 0.2 299.5 12.5 12/26/2018 15,600 9.7 0 441,743 251 26 2 55,314 0.3 0.2 286.0 11.9 12/27/2018 15,200 9.2 0.05 430,416 251 26 2 51,925 0.3 0.2 275.6 11.5 12/28/2018 13,900 8.5 0.6 393,604 251 25 2 47,286 0.3 0.2 274.4 11.4 12/29/2018 14,600 8.5 0.01 413,426 251 25 2 47,679 0.3 0.2 263.4 11.0 12/30/2018 20,200 12.4 0.2 572,000 251 29 2 72,482 0.3 0.2 289.5 12.1 12/31/2018 21,200 13.8 0 600,317 251 30 2 81,804 0.3 0.2 311.3 13.0 1/1/2019 20,600 13.8 0.01 583,327 251 30 2 81,433 0.3 0.2 318.9 13.3 1/2/2019 19,800 13.2 0 560,674 251 30 2 78,077 0.3 0.2 318.1 13.3 1/3/2019 19,600 12.9 0.22 555,010 251 29 2 76,137 0.3 0.2 313.4 13.1 1/4/2019 19,900 13.1 0.76 563,505 251 30 2 77,140 0.3 0.2 312.7 13.0 1/5/2019 20,800 13.8 0 588,990 251 30 2 81,309 0.3 0.2 315.3 13.1 1/6/2019 21,700 14.6 0 614,476 251 31 2 86,527 0.3 0.2 321.7 13.4 1/7/2019 20,100 13.9 0 569,169 251 30 2 81,989 0.2 0.2 329.0 13.7 1/8/2019 19,400 12.9 0 549,347 251 29 2 76,137 0.3 0.2 316.6 13.2 1/9/2019 19,300 12.7 0 546,515 251 29 2 74,881 0.3 0.2 313.0 13.0 1/10/2019 18,600 12.1 0 526,693 251 29 2 70,770 0.3 0.2 306.9 12.8 1/11/2019 17,900 11.4 0 506,872 251 28 2 66,431 0.3 0.2 299.4 12.5 1/12/2019 17,300 10.8 0 489,881 251 27 2 62,509 0.3 0.2 291.5 12.1 1/13/2019 17,100 10.5 0.7 484,218 251 27 2 60,765 0.3 0.2 286.6 11.9 1/14/2019 19,400 12.0 0 549,347 251 28 2 70,071 0.3 0.2 291.4 12.1 1/15/2019 20,900 13.5 0 591,822 251 30 2 79,946 0.3 0.2 308.6 12.9 1/16/2019 19,400 12.9 0 549,347 251 29 2 75,698 0.3 0.2 314.8 13.1 1/17/2019 17,300 11.2 0.17 489,881 251 28 2 65,148 0.3 0.2 303.8 12.7 1/18/2019 14,400 9.0 0 407,763 251 25 2 51,077 0.3 0.2 286.1 11.9 1/19/2019 9,790 6.0 0 277,222 251 22 2 31,507 0.3 0.2 259.6 10.8 1/20/2019 7,940 4.7 0.5 224,836 251 21 2 22,671 0.4 0.2 230.3 9.6 1/21/2019 10,200 5.4 0 288,832 251 22 2 27,256 0.4 0.3 215.6 9.0 1/22/2019 11,700 5.8 0 331,307 251 22 2 30,279 0.4 0.3 208.8 8.7 1/23/2019 11,200 5.7 0 317,149 251 22 2 29,248 0.4 0.3 210.7 8.8 1/24/2019 12,500 6.4 0.83 353,961 251 23 2 34,165 0.4 0.2 220.5 9.2 1/25/2019 12,900 7.4 0 365,287 251 24 2 40,355 0.3 0.2 252.4 10.5 1/26/2019 16,100 9.3 0 455,901 251 26 2 53,099 0.3 0.2 266.0 11.1 1/27/2019 16,600 10.1 0 470,060 251 27 2 58,109 0.3 0.2 282.4 11.8 1/28/2019 14,200 8.7 0 402,099 251 25 2 48,659 0.3 0.2 276.4 11.5 1/29/2019 11,900 7.2 0.09 336,970 251 24 2 39,245 0.3 0.2 266.0 11.1 1/30/2019 11,100 6.4 0 314,317 251 23 2 33,645 0.3 0.2 244.5 10.2 Page 19 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 1/31/2019 12,000 6.0 0 339,802 251 22 2 31,442 0.4 0.3 211.4 8.8 2/1/2019 9,470 5.1 0 268,161 251 22 2 25,785 0.4 0.3 219.6 9.2 2/2/2019 6,770 4.2 0 191,705 251 21 2 20,090 0.3 0.2 239.4 10.0 2/3/2019 6,140 4.0 0 173,865 251 20 2 18,717 0.3 0.2 245.9 10.2 2/4/2019 5,800 3.9 0 164,238 251 20 2 17,971 0.3 0.2 249.9 10.4 2/5/2019 5,180 3.7 0 146,681 251 20 2 16,488 0.3 0.2 256.8 10.7 2/6/2019 4,600 3.4 0 130,257 251 20 2 15,077 0.3 0.2 264.4 11.0 2/7/2019 4,390 3.3 0 124,311 251 20 2 14,528 0.3 0.2 267.0 11.1 2/8/2019 4,210 3.3 0 119,214 251 20 2 14,042 0.3 0.2 269.1 11.2 2/9/2019 3,810 3.1 0 107,887 251 20 2 12,953 0.3 0.2 274.2 11.4 2/10/2019 3,570 3.0 0 101,091 251 19 2 12,291 0.3 0.2 277.7 11.6 2/11/2019 3,460 2.9 0.25 97,976 251 19 2 11,931 0.3 0.2 278.2 11.6 2/12/2019 3,700 3.0 0.25 104,772 251 19 2 12,652 0.3 0.2 275.8 11.5 2/13/2019 4,500 3.4 0.02 127,426 251 20 2 14,833 0.3 0.2 265.9 11.1 2/14/2019 5,050 3.6 0 143,000 251 20 2 16,181 0.3 0.2 258.5 10.8 2/15/2019 6,340 4.1 0 179,529 251 21 2 19,153 0.3 0.2 243.7 10.2 2/16/2019 7,770 4.6 0.6 220,022 251 21 2 22,291 0.3 0.2 231.4 9.6 2/17/2019 11,500 5.8 0.04 325,644 251 22 2 29,828 0.4 0.3 209.2 8.7 2/18/2019 12,700 7.0 0.12 359,624 251 23 2 37,875 0.3 0.2 240.6 10.0 2/19/2019 13,200 7.6 0.11 373,782 251 24 2 41,597 0.3 0.2 254.2 10.6 2/20/2019 13,900 8.1 0.19 393,604 251 25 2 45,193 0.3 0.2 262.3 10.9 2/21/2019 15,300 8.9 0.16 433,248 251 25 2 50,228 0.3 0.2 264.8 11.0 2/22/2019 18,500 11.2 0.28 523,862 251 28 2 64,955 0.3 0.2 283.2 11.8 2/23/2019 21,600 13.6 0.46 611,644 251 30 2 80,566 0.3 0.2 300.9 12.5 2/24/2019 23,800 15.9 0.01 673,941 251 32 2 94,099 0.3 0.2 318.9 13.3 2/25/2019 23,600 16.7 0 668,278 251 33 2 98,914 0.2 0.2 338.1 14.1 2/26/2019 21,200 15.5 0 600,317 251 32 2 91,598 0.2 0.2 348.5 14.5 2/27/2019 17,200 12.1 0 487,050 251 29 2 71,151 0.2 0.2 333.7 13.9 2/28/2019 14,700 9.3 0 416,258 251 26 2 52,904 0.3 0.2 290.3 12.1 3/1/2019 14,000 8.5 0.68 396,436 251 25 2 47,482 0.3 0.2 273.6 11.4 3/2/2019 14,800 8.7 0.01 419,089 251 25 2 48,921 0.3 0.2 266.6 11.1 3/3/2019 16,100 9.7 1.04 455,901 251 26 2 55,445 0.3 0.2 277.8 11.6 3/4/2019 15,600 9.4 0.14 441,743 251 26 2 53,425 0.3 0.2 276.3 11.5 3/5/2019 18,400 11.3 0 521,030 251 28 2 65,790 0.3 0.2 288.4 12.0 3/6/2019 16,400 10.3 0 464,396 251 27 2 59,600 0.3 0.2 293.2 12.2 3/7/2019 12,600 7.8 0 356,792 251 24 2 42,970 0.3 0.2 275.1 11.5 3/8/2019 12,800 7.5 0.51 362,456 251 24 2 41,074 0.3 0.2 258.9 10.8 3/9/2019 15,000 8.7 0.07 424,753 251 25 2 49,182 0.3 0.2 264.5 11.0 3/10/2019 16,700 10.0 0 472,891 251 26 2 57,460 0.3 0.2 277.6 11.6 3/11/2019 17,300 10.6 0 489,881 251 27 2 60,959 0.3 0.2 284.2 11.8 Page 20 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 3/12/2019 17,300 10.6 0 489,881 251 27 2 61,411 0.3 0.2 286.3 11.9 3/13/2019 16,800 10.3 0 475,723 251 27 2 59,406 0.3 0.2 285.2 11.9 3/14/2019 16,100 9.8 0 455,901 251 26 2 56,355 0.3 0.2 282.4 11.8 3/15/2019 15,500 9.4 0.7 438,911 251 26 2 53,686 0.3 0.2 279.4 11.6 3/16/2019 15,300 9.2 0 433,248 251 26 2 52,317 0.3 0.2 275.8 11.5 3/17/2019 15,000 9.0 0 424,753 251 25 2 51,011 0.3 0.2 274.3 11.4 3/18/2019 14,800 8.8 0 419,089 251 25 2 49,836 0.3 0.2 271.6 11.3 3/19/2019 14,400 8.6 0 407,763 251 25 2 48,006 0.3 0.2 268.9 11.2 3/20/2019 12,400 7.5 0.19 351,129 251 24 2 41,074 0.3 0.2 267.2 11.1 3/21/2019 10,500 5.8 0.15 297,327 251 22 2 30,279 0.3 0.2 232.6 9.7 3/22/2019 13,000 6.8 0.01 368,119 251 23 2 36,376 0.4 0.2 225.7 9.4 3/23/2019 14,400 8.4 0 407,763 251 25 2 46,698 0.3 0.2 261.6 10.9 3/24/2019 11,300 6.7 0 319,980 251 23 2 36,050 0.3 0.2 257.4 10.7 3/25/2019 10,400 5.4 0.53 294,495 251 22 2 27,705 0.4 0.3 214.9 9.0 3/26/2019 10,700 5.5 0.07 302,990 251 22 2 28,347 0.4 0.3 213.7 8.9 3/27/2019 12,200 6.0 0 345,466 251 22 2 31,184 0.4 0.3 206.2 8.6 3/28/2019 12,400 6.1 0 351,129 251 22 2 31,701 0.4 0.3 206.2 8.6 3/29/2019 11,400 5.8 0 322,812 251 22 2 29,699 0.4 0.3 210.1 8.8 3/30/2019 7,730 4.6 0 218,889 251 21 2 22,039 0.4 0.2 230.0 9.6 3/31/2019 4,330 3.3 0 122,612 251 20 2 14,346 0.3 0.2 267.3 11.1 4/1/2019 3,950 3.2 0 111,852 251 20 2 13,375 0.3 0.2 273.2 11.4 4/2/2019 4,520 3.4 1.02 127,992 251 20 2 14,772 0.3 0.2 263.6 11.0 4/3/2019 6,470 4.1 0 183,210 251 21 2 19,465 0.3 0.2 242.7 10.1 4/4/2019 6,450 4.1 0 182,644 251 21 2 19,403 0.3 0.2 242.7 10.1 4/5/2019 6,020 4.0 1.03 170,467 251 20 2 18,468 0.3 0.2 247.5 10.3 4/6/2019 7,320 4.4 0 207,279 251 21 2 21,283 0.3 0.2 234.5 9.8 4/7/2019 11,200 5.7 0 317,149 251 22 2 29,312 0.4 0.3 211.1 8.8 4/8/2019 9,860 5.3 0 279,204 251 22 2 26,616 0.4 0.3 217.7 9.1 4/9/2019 11,300 5.8 0.03 319,980 251 22 2 30,086 0.4 0.3 214.8 8.9 4/10/2019 18,000 10.4 0 509,703 251 27 2 60,247 0.3 0.2 270.0 11.2 4/11/2019 16,400 10.2 0 464,396 251 27 2 58,693 0.3 0.2 288.7 12.0 4/12/2019 12,300 7.6 1.1 348,297 251 24 2 41,531 0.3 0.2 272.4 11.3 4/13/2019 17,500 10.1 1.18 495,545 251 26 2 57,849 0.3 0.2 266.7 11.1 4/14/2019 24,500 15.8 0.23 693,763 251 32 2 93,743 0.3 0.2 308.7 12.9 4/15/2019 22,900 16.1 0 648,456 251 33 2 95,459 0.2 0.2 336.3 14.0 4/16/2019 21,800 15.5 0 617,307 251 32 2 91,717 0.2 0.2 339.4 14.1 4/17/2019 16,100 11.6 0 455,901 251 28 2 67,903 0.2 0.2 340.2 14.2 4/18/2019 10,500 7.0 0 297,327 251 23 2 37,614 0.3 0.2 289.0 12.0 4/19/2019 8,840 5.1 0.48 250,321 251 21 2 25,274 0.3 0.2 230.6 9.6 4/20/2019 8,550 4.8 0 242,109 251 21 2 23,684 0.4 0.2 223.5 9.3 Page 21 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 4/21/2019 12,500 6.6 0 353,961 251 23 2 35,270 0.4 0.2 227.6 9.5 4/22/2019 11,000 5.7 0 311,485 251 22 2 29,634 0.4 0.3 217.3 9.1 4/23/2019 12,300 6.2 0 348,297 251 23 2 32,737 0.4 0.3 214.7 8.9 4/24/2019 12,700 7.3 0 359,624 251 24 2 39,833 0.3 0.2 253.0 10.5 4/25/2019 12,300 7.2 0 348,297 251 24 2 39,114 0.3 0.2 256.5 10.7 4/26/2019 11,600 6.8 0.05 328,475 251 23 2 36,506 0.3 0.2 253.9 10.6 4/27/2019 11,500 6.5 0 325,644 251 23 2 34,684 0.3 0.2 243.3 10.1 4/28/2019 11,800 6.3 0 334,139 251 23 2 33,450 0.4 0.2 228.7 9.5 4/29/2019 12,200 6.2 0 345,466 251 23 2 32,543 0.4 0.3 215.2 9.0 4/30/2019 12,400 6.1 0 351,129 251 22 2 31,766 0.4 0.3 206.6 8.6 5/1/2019 12,200 5.9 0 345,466 251 22 2 30,925 0.4 0.3 204.5 8.5 5/2/2019 11,900 5.8 0 336,970 251 22 2 30,279 0.4 0.3 205.3 8.6 5/3/2019 11,700 5.8 0 331,307 251 22 2 29,892 0.4 0.3 206.1 8.6 5/4/2019 10,800 5.5 0.16 305,822 251 22 2 27,898 0.4 0.3 208.4 8.7 5/5/2019 10,100 5.3 0.39 286,000 251 22 2 26,552 0.4 0.3 212.1 8.8 5/6/2019 10,700 5.5 0 302,990 251 22 2 27,769 0.4 0.3 209.4 8.7 5/7/2019 11,000 5.5 0 311,485 251 22 2 28,347 0.4 0.3 207.9 8.7 5/8/2019 8,570 4.7 0 242,675 251 21 2 23,240 0.4 0.3 218.8 9.1 5/9/2019 5,530 3.7 0 156,592 251 20 2 16,488 0.3 0.2 240.5 10.0 5/10/2019 3,500 2.8 0 99,109 251 19 2 11,333 0.3 0.2 261.2 10.9 5/11/2019 2,800 2.4 0 79,287 251 19 2 9,146 0.3 0.2 263.5 11.0 5/12/2019 2,700 2.4 0.13 76,455 251 19 2 8,794 0.3 0.2 262.7 10.9 5/13/2019 2,670 2.4 0 75,606 251 19 2 8,678 0.3 0.2 262.2 10.9 5/14/2019 2,860 2.5 0 80,986 251 19 2 9,263 0.3 0.2 261.3 10.9 5/15/2019 2,980 2.5 0 84,384 251 19 2 9,615 0.3 0.2 260.3 10.8 5/16/2019 3,110 2.6 0 88,065 251 19 2 10,028 0.3 0.2 260.1 10.8 5/17/2019 3,150 2.6 0 89,198 251 19 2 10,146 0.3 0.2 259.8 10.8 5/18/2019 2,750 2.4 0 77,871 251 19 2 8,853 0.3 0.2 259.7 10.8 5/19/2019 2,200 2.1 0 62,297 251 18 2 6,997 0.3 0.2 256.6 10.7 5/20/2019 1,980 1.9 0.24 56,067 251 18 2 6,139 0.3 0.2 250.1 10.4 5/21/2019 1,820 1.8 0 51,537 251 18 2 5,570 0.3 0.2 246.9 10.3 5/22/2019 1,640 1.7 0 46,440 251 18 2 4,780 0.3 0.2 235.1 9.8 5/23/2019 1,530 1.6 0 43,325 251 18 2 4,332 0.4 0.2 228.4 9.5 5/24/2019 1,440 1.5 0 40,776 251 18 2 3,942 0.4 0.2 220.8 9.2 5/25/2019 1,370 1.5 0 38,794 251 18 2 3,608 0.4 0.3 212.4 8.9 5/26/2019 1,280 1.4 0 36,246 251 18 2 3,159 0.4 0.3 199.1 8.3 5/27/2019 1,220 1.3 0 34,547 251 18 2 2,877 0.4 0.3 190.2 7.9 5/28/2019 1,180 1.3 0 33,414 251 18 2 2,707 0.4 0.3 185.0 7.7 5/29/2019 1,140 1.3 0 32,281 251 18 2 2,479 0.5 0.3 175.4 7.3 5/30/2019 1,100 1.2 0 31,149 251 18 2 2,250 0.5 0.3 165.0 6.9 Page 22 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 5/31/2019 1,130 1.3 0.1 31,998 251 18 2 2,421 0.5 0.3 172.9 7.2 6/1/2019 1,110 1.2 0 31,432 251 18 2 2,307 0.5 0.3 167.6 7.0 6/2/2019 1,060 1.2 0 30,016 251 18 2 2,020 0.5 0.4 153.7 6.4 6/3/2019 1,000 1.1 0 28,317 251 18 2 1,730 0.6 0.4 139.6 5.8 6/4/2019 959 1.1 0 27,156 251 18 2 1,498 0.6 0.4 126.0 5.3 6/5/2019 967 1.1 0.84 27,382 251 18 2 1,498 0.6 0.4 125.0 5.2 6/6/2019 1,150 1.3 0.01 32,564 251 18 2 2,536 0.5 0.3 177.9 7.4 6/7/2019 1,180 1.3 0 33,414 251 18 2 2,707 0.4 0.3 185.0 7.7 6/8/2019 1,400 1.5 0.01 39,644 251 18 2 3,720 0.4 0.3 214.3 8.9 6/9/2019 2,910 2.5 2.19 82,402 251 19 2 9,322 0.3 0.2 258.4 10.8 6/10/2019 7,470 4.3 0.79 211,527 251 21 2 20,466 0.4 0.2 221.0 9.2 6/11/2019 11,500 5.7 0.06 325,644 251 22 2 29,183 0.4 0.3 204.7 8.5 6/12/2019 11,200 5.6 0.39 317,149 251 22 2 28,476 0.4 0.3 205.1 8.5 6/13/2019 9,290 4.9 0.02 263,064 251 21 2 24,510 0.4 0.3 212.8 8.9 6/14/2019 8,460 4.7 0 239,561 251 21 2 22,797 0.4 0.3 217.4 9.1 6/15/2019 8,400 4.7 0 237,862 251 21 2 22,671 0.4 0.3 217.7 9.1 6/16/2019 8,170 4.6 0 231,349 251 21 2 22,228 0.4 0.3 219.5 9.1 6/17/2019 7,360 4.3 0 208,412 251 21 2 20,466 0.4 0.2 224.3 9.3 6/18/2019 6,800 4.1 0 192,555 251 21 2 19,215 0.4 0.2 227.9 9.5 6/19/2019 5,260 3.5 0 148,947 251 20 2 15,751 0.3 0.2 241.6 10.1 6/20/2019 3,760 2.9 0.08 106,471 251 19 2 11,871 0.3 0.2 254.7 10.6 6/21/2019 3,080 2.6 0 87,216 251 19 2 9,910 0.3 0.2 259.5 10.8 6/22/2019 2,920 2.5 0.23 82,685 251 19 2 9,439 0.3 0.2 260.8 10.9 6/23/2019 2,610 2.3 0 73,907 251 19 2 8,444 0.3 0.2 261.0 10.9 6/24/2019 2,860 2.5 0 80,986 251 19 2 9,204 0.3 0.2 259.6 10.8 6/25/2019 3,500 2.8 0 99,109 251 19 2 11,214 0.3 0.2 258.5 10.8 6/26/2019 3,110 2.6 0 88,065 251 19 2 9,969 0.3 0.2 258.6 10.8 6/27/2019 2,000 1.9 0 56,634 251 18 2 6,196 0.3 0.2 249.9 10.4 6/28/2019 1,460 1.5 0 41,343 251 18 2 3,998 0.4 0.2 220.9 9.2 6/29/2019 1,160 1.3 0 32,848 251 18 2 2,593 0.4 0.3 180.3 7.5 6/30/2019 1,120 1.3 0 31,715 251 18 2 2,364 0.5 0.3 170.3 7.1 7/1/2019 1,080 1.2 0 30,582 251 18 2 2,135 0.5 0.3 159.4 6.6 7/2/2019 1,020 1.2 0.03 28,883 251 18 2 1,846 0.6 0.4 146.0 6.1 7/3/2019 1,040 1.2 0 29,450 251 18 2 1,962 0.5 0.4 152.2 6.3 7/4/2019 1,250 1.3 1.72 35,396 251 18 2 2,877 0.4 0.3 185.6 7.7 7/5/2019 2,430 2.2 0 68,810 251 19 2 7,805 0.3 0.2 259.1 10.8 7/6/2019 2,360 2.2 0 66,828 251 19 2 7,516 0.3 0.2 256.9 10.7 7/7/2019 1,750 1.8 0 49,554 251 18 2 5,231 0.3 0.2 241.1 10.0 7/8/2019 1,830 1.8 0.43 51,820 251 18 2 5,514 0.3 0.2 243.0 10.1 7/9/2019 2,130 2.0 0 60,315 251 18 2 6,710 0.3 0.2 254.1 10.6 Page 23 of 24 August 2019 APPENDIX B-2 SUMMARY OF FLOW IN CAPE FEAR RIVER AT WILM O'HUSKE LOCK NR TARHEEL, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) Measured River Width (ft) Estimated River Depth (ft) Z Value3 Calculated Total Cross Sectional Area (ft2) Calculated River Velocity (ft/s) Calculated River Velocity (mph) Calculated Travel Time to Kelly (hrs) Calculated Travel Time to Kelly (days) 7/10/2019 2,000 1.9 0.01 56,634 251 18 2 6,253 0.3 0.2 252.2 10.5 7/11/2019 1,780 1.8 0 50,404 251 18 2 5,400 0.3 0.2 244.7 10.2 7/12/2019 2,490 2.2 0.15 70,509 251 19 2 7,921 0.3 0.2 256.6 10.7 7/13/2019 3,090 2.6 0 87,499 251 19 2 9,969 0.3 0.2 260.2 10.8 7/14/2019 2,520 2.3 0 71,358 251 19 2 8,095 0.3 0.2 259.1 10.8 7/15/2019 2,270 2.1 0 64,279 251 19 2 7,227 0.3 0.2 256.8 10.7 7/16/2019 1,820 1.8 0 51,537 251 18 2 5,514 0.3 0.2 244.4 10.2 7/17/2019 1,470 1.6 0 41,626 251 18 2 4,053 0.4 0.2 222.4 9.3 Notes: 1) Measurements are recorded from the USGS flow gauging station at the W.O. Huske Dam, ID 02105500 (USGS, 2019). 2) The minimum value recorded by a USGS raingage is 0.01 inches. Anything detected below this threshold is recorded as 0 inches. 3) Z value is an estimated factor used to compute total cross sectional area from river depth. cfs: cubic feet per second. ft: feet. ft2: feet squared. hrs: hours. L/s: Liter per second. mph: miles per hour. USGS - United States Geological Survey. Page 24 of 24 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 1/1/2017 3,150 16 0.10 89,198 1/2/2017 3,270 17 1.63 92,596 1/3/2017 4,160 17 0.10 117,798 1/4/2017 6,550 18 0.00 185,475 1/5/2017 8,490 18 0.00 240,410 1/6/2017 8,400 18 0.05 237,862 1/7/2017 7,650 18 0.47 216,624 1/8/2017 8,450 18 0.00 239,277 1/9/2017 9,110 19 0.00 257,966 1/10/2017 8,650 18 0.00 244,941 1/11/2017 7,660 18 0.01 216,907 1/12/2017 6,860 18 0.00 194,254 1/13/2017 6,410 18 0.00 181,511 1/14/2017 6,260 18 0.00 177,263 1/15/2017 6,090 18 0.00 172,450 1/16/2017 5,280 17 0.00 149,513 1/17/2017 4,570 17 0.00 129,408 1/18/2017 4,210 17 0.00 119,214 1/19/2017 3,770 17 0.00 106,755 1/20/2017 3,190 16 0.00 90,331 1/21/2017 2,950 16 0.30 83,535 1/22/2017 2,910 16 0.38 82,402 1/23/2017 3,190 16 0.05 90,331 1/24/2017 3,830 17 0.00 108,454 1/25/2017 6,160 18 0.00 174,432 1/26/2017 8,620 18 0.02 244,091 1/27/2017 8,370 18 0.00 237,012 1/28/2017 7,540 18 0.00 213,509 1/29/2017 6,770 18 0.00 191,705 1/30/2017 6,370 18 0.00 180,378 1/31/2017 6,140 18 0.00 173,865 2/1/2017 5,740 18 0.00 162,539 2/2/2017 4,440 17 0.00 125,727 2/3/2017 3,360 17 0.09 95,145 2/4/2017 2,980 16 0.00 84,384 2/5/2017 2,790 16 0.00 79,004 2/6/2017 2,690 16 0.00 76,172 2/7/2017 2,630 16 0.00 74,473 2/8/2017 2,520 16 0.50 71,358 2/9/2017 2,420 16 0.20 68,527 2/10/2017 2,400 16 0.00 67,960 Page 1 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 2/11/2017 2,500 16 0.00 70,792 2/12/2017 2,620 16 0.00 74,190 2/13/2017 2,630 16 0.00 74,473 2/14/2017 2,470 16 0.00 69,943 2/15/2017 2,380 16 0.81 67,394 2/16/2017 2,820 16 0.00 79,854 2/17/2017 3,300 17 0.00 93,446 2/18/2017 3,480 17 0.00 98,543 2/19/2017 3,390 17 0.00 95,994 2/20/2017 3,120 16 0.00 88,349 2/21/2017 2,870 16 0.00 81,269 2/22/2017 2,690 16 0.00 76,172 2/23/2017 2,400 16 0.00 67,960 2/24/2017 2,120 16 0.00 60,032 2/25/2017 2,010 16 0.00 56,917 2/26/2017 1,940 16 0.00 54,935 2/27/2017 1,880 16 0.00 53,236 2/28/2017 1,840 16 0.08 52,103 3/1/2017 1,790 16 0.01 50,687 3/2/2017 1,860 16 0.10 52,669 3/3/2017 2,040 16 0.00 57,766 3/4/2017 2,380 16 0.00 67,394 3/5/2017 2,690 16 0.00 76,172 3/6/2017 2,570 16 0.00 72,774 3/7/2017 2,240 16 0.00 63,430 3/8/2017 2,260 16 0.00 63,996 3/9/2017 2,460 16 0.00 69,659 3/10/2017 2,460 16 0.02 69,659 3/11/2017 2,350 16 0.00 66,545 3/12/2017 2,210 16 0.35 62,580 3/13/2017 1,960 16 0.68 55,501 3/14/2017 2,160 16 0.13 61,164 3/15/2017 2,680 16 0.00 75,889 3/16/2017 2,960 16 0.00 83,818 3/17/2017 3,050 16 0.00 86,366 3/18/2017 2,900 16 0.12 82,119 3/19/2017 2,840 16 0.01 80,420 3/20/2017 2,650 16 0.00 75,040 Page 2 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 3/21/2017 2,440 16 0.00 69,093 3/22/2017 2,560 16 0.13 72,491 3/23/2017 2,760 16 0.00 78,154 3/24/2017 2,740 16 0.00 77,588 3/25/2017 2,500 16 0.00 70,792 3/26/2017 2,140 16 0.00 60,598 3/27/2017 1,920 16 0.00 54,368 3/28/2017 1,820 16 0.41 51,537 3/29/2017 1,730 16 0.00 48,988 3/30/2017 1,680 16 0.00 47,572 3/31/2017 1,800 16 0.41 50,970 4/1/2017 2,380 16 0.00 67,394 4/2/2017 3,070 16 0.00 86,933 4/3/2017 3,090 16 0.56 87,499 4/4/2017 3,110 16 0.01 88,065 4/5/2017 3,580 17 0.73 101,374 4/6/2017 5,000 17 0.30 141,584 4/7/2017 6,090 18 0.00 172,450 4/8/2017 6,710 18 0.00 190,006 4/9/2017 7,110 18 0.00 201,333 4/10/2017 6,220 18 0.00 176,131 4/11/2017 4,370 17 0.00 123,745 4/12/2017 2,890 16 0.00 81,836 4/13/2017 2,270 16 0.39 64,279 4/14/2017 2,030 16 0.00 57,483 4/15/2017 1,870 16 0.00 52,953 4/16/2017 1,740 16 0.00 49,271 4/17/2017 1,660 16 0.00 47,006 4/18/2017 1,590 16 0.02 45,024 4/19/2017 1,560 16 0.15 44,174 4/20/2017 1,510 16 0.00 42,758 4/21/2017 1,430 15 0.00 40,493 4/22/2017 1,390 15 0.00 39,360 4/23/2017 1,350 15 0.02 38,228 4/24/2017 1,710 16 2.43 48,422 4/25/2017 5,040 17 0.44 142,717 4/26/2017 12,600 19 0.00 356,792 4/27/2017 17,100 20 0.00 484,218 4/28/2017 19,000 21 0.00 538,020 4/29/2017 20,000 21 0.00 566,337 4/30/2017 20,200 21 0.00 572,000 Page 3 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 5/1/2017 19,200 21 0.01 543,683 5/2/2017 17,800 20 0.37 504,040 5/3/2017 16,300 20 0.00 461,565 5/4/2017 15,200 20 0.06 430,416 5/5/2017 14,400 20 0.50 407,763 5/6/2017 14,000 20 0.09 396,436 5/7/2017 14,100 20 0.06 399,268 5/8/2017 14,000 20 0.00 396,436 5/9/2017 12,200 19 0.00 345,466 5/10/2017 8,810 18 0.00 249,471 5/11/2017 5,820 18 0.00 164,804 5/12/2017 4,090 17 0.00 115,816 5/13/2017 3,480 17 0.00 98,543 5/14/2017 3,060 16 0.00 86,650 5/15/2017 2,810 16 0.00 79,570 5/16/2017 2,630 16 0.00 74,473 5/17/2017 2,260 16 0.00 63,996 5/18/2017 1,850 16 0.00 52,386 5/19/2017 1,650 16 0.00 46,723 5/20/2017 1,520 16 0.00 43,042 5/21/2017 1,470 15 0.00 41,626 5/22/2017 1,630 16 0.66 46,156 5/23/2017 1,890 16 1.18 53,519 5/24/2017 3,550 17 0.51 100,525 5/25/2017 6,340 18 0.28 179,529 5/26/2017 8,780 18 0.00 248,622 5/27/2017 10,800 19 0.00 305,822 5/28/2017 11,700 19 0.19 331,307 5/29/2017 10,400 19 0.25 294,495 5/30/2017 8,160 18 0.12 231,065 5/31/2017 6,980 18 0.00 197,652 6/1/2017 7,030 18 0.00 199,067 6/2/2017 7,680 18 0.03 217,473 6/3/2017 7,640 18 0.00 216,341 6/4/2017 6,370 18 0.00 180,378 6/5/2017 4,390 17 0.64 124,311 6/6/2017 3,460 17 0.09 97,976 6/7/2017 4,020 17 0.30 113,834 6/8/2017 4,470 17 0.34 126,576 6/9/2017 4,840 17 0.00 137,054 6/10/2017 4,550 17 0.00 128,842 Page 4 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 6/11/2017 3,510 17 0.00 99,392 6/12/2017 2,560 16 0.00 72,491 6/13/2017 2,090 16 0.00 59,182 6/14/2017 1,670 16 0.77 47,289 6/15/2017 1,580 16 0.08 44,741 6/16/2017 1,770 16 0.25 50,121 6/17/2017 1,890 16 0.03 53,519 6/18/2017 1,920 16 0.03 54,368 6/19/2017 2,300 16 0.07 65,129 6/20/2017 2,500 16 0.59 70,792 6/21/2017 4,250 17 0.04 120,347 6/22/2017 6,620 18 0.14 187,458 6/23/2017 8,950 19 0.00 253,436 6/24/2017 8,630 18 0.42 244,374 6/25/2017 9,630 19 0.01 272,691 6/26/2017 11,100 19 0.02 314,317 6/27/2017 11,200 19 0.00 317,149 6/28/2017 10,500 19 0.00 297,327 6/29/2017 9,510 19 0.00 269,293 6/30/2017 8,210 18 1.68 232,481 7/1/2017 7,200 18 0.02 203,881 7/2/2017 5,400 17 0.00 152,911 7/3/2017 3,640 17 0.00 103,073 7/4/2017 3,390 17 0.00 95,994 7/5/2017 3,330 17 0.00 94,295 7/6/2017 2,950 16 0.00 83,535 7/7/2017 2,510 16 0.28 71,075 7/8/2017 2,240 16 0.38 63,430 7/9/2017 2,040 16 0.60 57,766 7/10/2017 1,950 16 0.46 55,218 7/11/2017 1,970 16 0.05 55,784 7/12/2017 1,840 16 0.01 52,103 7/13/2017 1,800 16 0.00 50,970 7/14/2017 1,580 16 0.00 44,741 7/15/2017 1,400 15 0.67 39,644 7/16/2017 1,400 15 0.02 39,644 7/17/2017 1,490 15 0.04 42,192 7/18/2017 1,870 16 0.16 52,953 7/19/2017 1,930 16 0.10 54,652 7/20/2017 1,630 16 0.01 46,156 7/21/2017 1,550 16 0.00 43,891 Page 5 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 7/22/2017 1,590 16 0.00 45,024 7/23/2017 1,550 16 0.00 43,891 7/24/2017 1,550 16 0.00 43,891 7/25/2017 1,590 16 0.00 45,024 7/26/2017 1,510 16 0.00 42,758 7/27/2017 1,370 15 0.00 38,794 7/28/2017 1,220 15 0.00 34,547 7/29/2017 1,150 15 0.62 32,564 7/30/2017 1,120 15 0.00 31,715 7/31/2017 1,090 15 0.00 30,865 8/1/2017 1,060 15 0.00 30,016 8/2/2017 1,030 15 0.00 29,166 8/3/2017 976 15 0.00 27,637 8/4/2017 956 15 0.01 27,071 8/5/2017 957 15 0.01 27,099 8/6/2017 982 15 0.00 27,807 8/7/2017 974 15 0.24 27,581 8/8/2017 1,130 15 1.40 31,998 8/9/2017 1,460 15 0.00 41,343 8/10/2017 1,590 16 0.05 45,024 8/11/2017 1,550 16 0.21 43,891 8/12/2017 1,400 15 0.26 39,644 8/13/2017 1,590 16 0.77 45,024 8/14/2017 2,950 16 0.01 83,535 8/15/2017 2,980 16 0.42 84,384 8/16/2017 2,180 16 0.00 61,731 8/17/2017 1,680 16 0.00 47,572 8/18/2017 1,580 16 0.00 44,741 8/19/2017 1,640 16 1.27 46,440 8/20/2017 1,580 16 0.00 44,741 8/21/2017 1,370 15 0.00 38,794 8/22/2017 1,210 15 0.01 34,263 8/23/2017 1,150 15 0.57 32,564 8/24/2017 1,260 15 0.57 35,679 8/25/2017 1,590 16 0.65 45,024 8/26/2017 1,520 16 0.00 43,042 8/27/2017 1,280 15 0.00 36,246 8/28/2017 1,110 15 0.02 31,432 8/29/2017 1,160 15 0.07 32,848 8/30/2017 1,130 15 0.00 31,998 8/31/2017 1,060 15 0.29 30,016 Page 6 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 9/1/2017 1,110 15 0.01 31,432 9/2/2017 1,550 16 0.52 43,891 9/3/2017 2,540 16 0.00 71,925 9/4/2017 2,480 16 0.00 70,226 9/5/2017 1,850 16 0.19 52,386 9/6/2017 1,750 16 1.17 49,554 9/7/2017 2,000 16 0.00 56,634 9/8/2017 2,180 16 0.00 61,731 9/9/2017 2,090 16 0.00 59,182 9/10/2017 1,740 16 0.00 49,271 9/11/2017 1,530 16 0.08 43,325 9/12/2017 1,980 16 3.08 56,067 9/13/2017 2,530 16 0.00 71,642 9/14/2017 2,350 16 0.00 66,545 9/15/2017 2,130 16 0.00 60,315 9/16/2017 1,840 16 0.00 52,103 9/17/2017 1,600 16 0.00 45,307 9/18/2017 1,430 15 0.00 40,493 9/19/2017 1,310 15 0.00 37,095 9/20/2017 1,220 15 0.16 34,547 9/21/2017 1,210 15 0.24 34,263 9/22/2017 1,180 15 0.00 33,414 9/23/2017 1,120 15 0.00 31,715 9/24/2017 1,070 15 0.00 30,299 9/25/2017 1,010 15 0.00 28,600 9/26/2017 991 15 0.00 28,062 9/27/2017 965 15 0.00 27,326 9/28/2017 929 15 0.00 26,306 9/29/2017 909 15 0.00 25,740 9/30/2017 875 15 0.00 24,777 10/1/2017 822 15 0.00 23,276 10/2/2017 812 15 0.00 22,993 10/3/2017 825 15 0.00 23,361 10/4/2017 837 15 0.00 23,701 10/5/2017 849 15 0.00 24,041 10/6/2017 855 15 0.00 24,211 10/7/2017 862 15 0.15 24,409 10/8/2017 919 15 0.06 26,023 10/9/2017 1,080 15 0.50 30,582 10/10/2017 1,250 15 0.01 35,396 10/11/2017 1,280 15 0.03 36,246 Page 7 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 10/12/2017 1,240 15 0.01 35,113 10/13/2017 1,150 15 0.00 32,564 10/14/2017 1,120 15 0.00 31,715 10/15/2017 1,100 15 0.00 31,149 10/16/2017 1,040 15 0.24 29,450 10/17/2017 958 15 0.00 27,128 10/18/2017 933 15 0.00 26,420 10/19/2017 901 15 0.00 25,513 10/20/2017 863 15 0.00 24,437 10/21/2017 847 15 0.00 23,984 10/22/2017 837 15 0.00 23,701 10/23/2017 803 15 0.96 22,738 10/24/2017 893 15 0.01 25,287 10/25/2017 1,080 15 0.00 30,582 10/26/2017 1,410 15 0.00 39,927 10/27/2017 1,430 15 0.00 40,493 10/28/2017 1,300 15 0.26 36,812 10/29/2017 1,340 15 0.57 37,945 10/30/2017 1,430 15 0.00 40,493 10/31/2017 1,370 15 0.00 38,794 11/1/2017 1,200 15 0.00 33,980 11/2/2017 1,050 15 0.00 29,733 11/3/2017 929 15 0.00 26,306 11/4/2017 886 15 0.00 25,089 11/5/2017 880 15 0.00 24,919 11/6/2017 852 15 0.00 24,126 11/7/2017 848 15 0.00 24,013 11/8/2017 874 15 0.01 24,749 11/9/2017 914 15 0.42 25,882 11/10/2017 970 15 0.00 27,467 11/11/2017 1,030 15 0.00 29,166 11/12/2017 1,060 15 0.00 30,016 11/13/2017 1,060 15 0.18 30,016 11/14/2017 1,050 15 0.00 29,733 11/15/2017 1,080 15 0.00 30,582 11/16/2017 1,130 15 0.00 31,998 11/17/2017 1,150 15 0.00 32,564 11/18/2017 1,090 15 0.00 30,865 11/19/2017 1,050 15 0.02 29,733 11/20/2017 1,010 15 0.00 28,600 11/21/2017 1,010 15 0.01 28,600 Page 8 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 11/22/2017 1,010 15 0.03 28,600 11/23/2017 996 15 0.00 28,204 11/24/2017 1,050 15 0.00 29,733 11/25/2017 1,070 15 0.00 30,299 11/26/2017 1,050 15 0.00 29,733 11/27/2017 1,000 15 0.00 28,317 11/28/2017 964 15 0.00 27,297 11/29/2017 963 15 0.00 27,269 11/30/2017 957 15 0.00 27,099 12/1/2017 966 15 0.00 27,354 12/2/2017 996 15 0.00 28,204 12/3/2017 1,010 15 0.00 28,600 12/4/2017 996 15 0.00 28,204 12/5/2017 1,000 15 0.01 28,317 12/6/2017 1,040 15 0.25 29,450 12/7/2017 1,100 15 0.21 31,149 12/8/2017 1,270 15 1.37 35,962 12/9/2017 2,160 16 0.42 61,164 12/10/2017 3,080 16 0.00 87,216 12/11/2017 3,200 17 0.00 90,614 12/12/2017 2,770 16 0.00 78,438 12/13/2017 2,220 16 62,863 12/14/2017 1,850 16 0.00 52,386 12/15/2017 1,560 16 0.01 44,174 12/16/2017 1,290 15 0.00 36,529 12/17/2017 1,100 15 0.00 31,149 12/18/2017 988 15 0.02 27,977 12/19/2017 921 15 0.00 26,080 12/20/2017 935 15 0.72 26,476 12/21/2017 1,210 15 0.01 34,263 12/22/2017 1,490 16 0.01 42,192 12/23/2017 1,650 16 0.00 46,723 12/24/2017 1,660 16 0.50 47,006 12/25/2017 1,520 16 0.01 43,042 12/26/2017 1,330 16 0.00 37,661 12/27/2017 1,250 16 0.34 35,396 12/28/2017 1,210 15 0.00 34,263 12/29/2017 1,180 15 0.00 33,414 12/30/2017 1,220 15 0.00 34,547 12/31/2017 1,110 15 0.00 31,432 1/1/2018 1,030 15 0.00 29,166 Page 9 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 1/2/2018 971 15 0.00 27,496 1/3/2018 974 15 27,581 1/4/2018 967 15 27,382 1/5/2018 906 15 0.00 25,655 1/6/2018 883 15 0.00 25,004 1/7/2018 854 15 0.00 24,183 1/8/2018 840 15 0.00 23,786 1/9/2018 866 15 0.00 24,522 1/10/2018 883 15 0.01 25,004 1/11/2018 863 15 0.14 24,437 1/12/2018 919 15 1.32 26,023 1/13/2018 1,180 15 0.01 33,414 1/14/2018 1,380 16 0.00 39,077 1/15/2018 1,540 16 0.00 43,608 1/16/2018 1,520 16 0.00 43,042 1/17/2018 1,480 16 0.08 41,909 1/18/2018 1,530 16 0.00 43,325 1/19/2018 1,500 16 0.00 42,475 1/20/2018 1,420 16 0.00 40,210 1/21/2018 1,340 16 0.00 37,945 1/22/2018 1,300 16 0.06 36,812 1/23/2018 1,290 16 0.07 36,529 1/24/2018 1,340 16 0.00 37,945 1/25/2018 1,400 16 0.00 39,644 1/26/2018 1,700 16 0.00 48,139 1/27/2018 2,000 16 0.00 56,634 1/28/2018 1,780 16 1.16 50,404 1/29/2018 2,500 16 0.54 70,792 1/30/2018 5,250 17 0.00 148,663 1/31/2018 8,090 18 0.00 229,083 2/1/2018 8,200 18 0.00 232,198 2/2/2018 5,930 18 0.09 167,919 2/3/2018 4,200 17 0.00 118,931 2/4/2018 3,250 17 0.54 92,030 2/5/2018 3,340 17 0.00 94,578 2/6/2018 4,680 17 0.00 132,523 2/7/2018 6,290 18 178,113 2/8/2018 6,050 18 171,317 2/9/2018 4,730 17 133,939 2/10/2018 4,030 17 114,117 2/11/2018 4,260 17 120,630 Page 10 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 2/12/2018 4,070 17 115,250 2/13/2018 3,650 17 0.00 103,356 2/14/2018 4,390 17 0.00 124,311 2/15/2018 4,680 17 0.00 132,523 2/16/2018 4,350 17 0.00 123,178 2/17/2018 4,120 17 0.00 116,665 2/18/2018 3,890 17 0.00 110,153 2/19/2018 3,660 17 0.11 103,640 2/20/2018 3,420 17 0.01 96,844 2/21/2018 3,340 17 0.00 94,578 2/22/2018 3,270 17 0.00 92,596 2/23/2018 3,220 16 0.00 91,180 2/24/2018 2,690 16 0.00 76,172 2/25/2018 2,170 16 0.00 61,448 2/26/2018 1,970 16 0.08 55,784 2/27/2018 1,870 16 0.00 52,953 2/28/2018 1,790 16 0.12 50,687 3/1/2018 1,820 16 0.82 51,537 3/2/2018 2,300 16 0.01 65,129 3/3/2018 3,080 16 0.00 87,216 3/4/2018 3,960 17 0.00 112,135 3/5/2018 4,510 17 0.00 127,709 3/6/2018 4,110 17 0.09 116,382 3/7/2018 3,520 17 0.22 99,675 3/8/2018 2,860 16 0.00 80,986 3/9/2018 2,570 16 0.00 72,774 3/10/2018 2,850 16 0.00 80,703 3/11/2018 2,980 16 0.05 84,384 3/12/2018 2,730 16 0.47 77,305 3/13/2018 2,850 16 0.01 80,703 3/14/2018 4,930 17 0.00 139,602 3/15/2018 7,050 18 0.00 199,634 3/16/2018 7,530 18 0.00 213,226 3/17/2018 7,070 18 0.00 200,200 3/18/2018 5,820 18 0.00 164,804 3/19/2018 4,920 17 0.00 139,319 3/20/2018 4,590 17 1.89 129,974 3/21/2018 5,310 17 0.01 150,362 3/22/2018 7,830 18 0.00 221,721 3/23/2018 10,300 19 0.00 291,664 3/24/2018 10,300 19 0.14 291,664 Page 11 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 3/25/2018 8,270 18 0.18 234,180 3/26/2018 7,260 18 0.00 205,580 3/27/2018 7,540 18 0.00 213,509 3/28/2018 7,560 18 0.00 214,075 3/29/2018 7,390 18 0.00 209,261 3/30/2018 6,950 18 0.00 196,802 3/31/2018 6,420 18 0.00 181,794 4/1/2018 5,040 17 0.00 142,717 4/2/2018 3,980 17 0.00 112,701 4/3/2018 3,500 17 0.00 99,109 4/4/2018 2,860 16 0.04 80,986 4/5/2018 2,360 16 0.00 66,828 4/6/2018 2,260 16 0.00 63,996 4/7/2018 2,160 16 0.85 61,164 4/8/2018 2,390 16 0.20 67,677 4/9/2018 3,020 16 0.29 85,517 4/10/2018 3,690 17 0.01 104,489 4/11/2018 4,810 17 0.00 136,204 4/12/2018 5,120 17 0.00 144,982 4/13/2018 4,620 17 0.00 130,824 4/14/2018 3,340 17 0.00 94,578 4/15/2018 2,450 16 0.75 69,376 4/16/2018 2,640 16 0.01 74,756 4/17/2018 8,050 18 0.00 227,951 4/18/2018 13,100 20 0.00 370,951 4/19/2018 14,100 20 0.00 399,268 4/20/2018 13,900 20 0.00 393,604 4/21/2018 12,700 19 0.00 359,624 4/22/2018 10,300 19 0.00 291,664 4/23/2018 8,410 18 0.25 238,145 4/24/2018 7,960 18 1.36 225,402 4/25/2018 7,310 18 0.00 206,996 4/26/2018 9,520 19 0.00 269,576 4/27/2018 13,500 20 0.09 382,277 4/28/2018 14,400 20 0.00 407,763 4/29/2018 13,700 20 0.00 387,941 4/30/2018 12,400 19 0.00 351,129 5/1/2018 10,300 19 0.00 291,664 5/2/2018 8,500 18 0.00 240,693 5/3/2018 7,490 18 0.00 212,093 5/4/2018 6,940 18 0.00 196,519 Page 12 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 5/5/2018 6,570 18 0.00 186,042 5/6/2018 5,310 17 0.50 150,362 5/7/2018 4,430 17 0.00 125,444 5/8/2018 4,030 17 0.00 114,117 5/9/2018 3,450 17 0.00 97,693 5/10/2018 2,780 16 0.00 78,721 5/11/2018 2,370 16 0.00 67,111 5/12/2018 1,840 16 0.00 52,103 5/13/2018 1,480 15 0.00 41,909 5/14/2018 1,350 15 0.00 38,228 5/15/2018 1,300 15 0.07 36,812 5/16/2018 1,330 15 0.00 37,661 5/17/2018 1,410 15 0.06 39,927 5/18/2018 1,770 16 0.55 50,121 5/19/2018 2,480 16 1.46 70,226 5/20/2018 3,550 17 0.02 100,525 5/21/2018 5,610 17 0.00 158,858 5/22/2018 7,540 18 0.01 213,509 5/23/2018 7,360 18 0.02 208,412 5/24/2018 8,300 18 0.00 235,030 5/25/2018 8,730 18 0.08 247,206 5/26/2018 7,540 18 0.08 213,509 5/27/2018 5,200 17 0.14 147,248 5/28/2018 3,710 17 2.15 105,056 5/29/2018 3,800 17 0.77 107,604 5/30/2018 4,280 17 0.01 121,196 5/31/2018 5,230 17 0.06 148,097 6/1/2018 6,800 18 0.01 192,555 6/2/2018 7,360 18 0.04 208,412 6/3/2018 6,050 18 0.00 171,317 6/4/2018 4,450 17 0.00 126,010 6/5/2018 3,170 17 0.00 89,764 6/6/2018 2,340 16 0.00 66,261 6/7/2018 1,830 16 0.03 51,820 6/8/2018 1,480 16 0.00 41,909 6/9/2018 1,290 15 1.00 36,529 6/10/2018 1,200 15 0.01 33,980 6/11/2018 1,070 15 0.60 30,299 6/12/2018 1,440 16 0.02 40,776 6/13/2018 2,120 16 0.00 60,032 Page 13 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 6/14/2018 2,030 16 0.36 57,483 6/15/2018 1,660 16 0.00 47,006 6/16/2018 1,420 16 0.00 40,210 6/17/2018 1,230 15 0.00 34,830 6/18/2018 1,100 15 0.00 31,149 6/19/2018 1,050 15 0.00 29,733 6/20/2018 988 15 0.00 27,977 6/21/2018 948 15 0.00 26,844 6/22/2018 1,000 15 0.02 28,317 6/23/2018 1,000 15 0.12 28,317 6/24/2018 973 15 1.37 27,552 6/25/2018 1,040 15 0.95 29,450 6/26/2018 1,260 15 1.06 35,679 6/27/2018 1,920 16 0.00 54,368 6/28/2018 2,370 16 0.00 67,111 6/29/2018 2,530 16 0.00 71,642 6/30/2018 2,150 16 0.07 60,881 7/1/2018 1,660 16 0.05 47,006 7/2/2018 1,340 15 0.00 37,945 7/3/2018 1,110 15 0.00 31,432 7/4/2018 954 15 0.00 27,014 7/5/2018 859 15 0.37 24,324 7/6/2018 852 15 0.01 24,126 7/7/2018 965 15 0.00 27,326 7/8/2018 1,290 15 0.00 36,529 7/9/2018 1,670 16 0.00 47,289 7/10/2018 1,670 16 0.00 47,289 7/11/2018 1,520 16 0.00 43,042 7/12/2018 1,190 15 0.54 33,697 7/13/2018 1,050 15 0.01 29,733 7/14/2018 970 15 0.00 27,467 7/15/2018 851 15 0.00 24,098 7/16/2018 792 15 0.00 22,427 7/17/2018 784 15 0.02 22,200 7/18/2018 906 15 0.27 25,655 7/19/2018 1,800 16 0.00 50,970 7/20/2018 1,600 16 0.42 45,307 7/21/2018 1,140 15 0.05 32,281 7/22/2018 926 15 0.00 26,221 7/23/2018 1,960 16 0.11 55,501 7/24/2018 5,140 17 0.63 145,549 Page 14 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 7/25/2018 6,340 18 0.38 179,529 7/26/2018 5,050 17 0.01 143,000 7/27/2018 4,210 17 0.00 119,214 7/28/2018 3,370 17 0.01 95,428 7/29/2018 3,470 17 0.03 98,259 7/30/2018 3,920 17 0.67 111,002 7/31/2018 4,350 17 0.09 123,178 8/1/2018 4,550 17 0.31 128,842 8/2/2018 4,420 17 0.88 125,160 8/3/2018 4,290 17 0.10 121,479 8/4/2018 5,250 17 0.09 148,663 8/5/2018 8,980 19 0.12 254,285 8/6/2018 9,550 19 0.01 270,426 8/7/2018 9,010 19 0.00 255,135 8/8/2018 8,620 18 0.14 244,091 8/9/2018 8,390 18 0.00 237,578 8/10/2018 9,610 19 0.00 272,125 8/11/2018 9,570 19 0.22 270,992 8/12/2018 7,910 18 0.00 223,986 8/13/2018 9,060 19 0.19 256,551 8/14/2018 11,300 19 0.02 319,980 8/15/2018 12,500 19 0.00 353,961 8/16/2018 13,300 20 0.00 376,614 8/17/2018 12,500 19 0.11 353,961 8/18/2018 10,200 19 0.02 288,832 8/19/2018 6,960 18 0.00 197,085 8/20/2018 7,680 18 0.00 217,473 8/21/2018 11,300 19 0.00 319,980 8/22/2018 13,800 20 0.00 390,772 8/23/2018 14,600 20 0.02 413,426 8/24/2018 13,700 20 0.00 387,941 8/25/2018 12,100 19 0.00 342,634 8/26/2018 8,090 18 0.00 229,083 8/27/2018 4,930 17 0.00 139,602 8/28/2018 3,310 17 0.00 93,729 8/29/2018 2,200 16 0.00 62,297 8/30/2018 1,680 16 0.00 47,572 8/31/2018 1,470 16 0.00 41,626 9/1/2018 1,370 15 0.00 38,794 9/2/2018 1,420 16 0.00 40,210 9/3/2018 1,610 16 0.16 45,590 Page 15 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 9/4/2018 1,810 16 0.00 51,253 9/5/2018 1,810 16 0.00 51,253 9/6/2018 1,610 16 0.00 45,590 9/7/2018 1,370 15 0.08 38,794 9/8/2018 1,240 15 0.01 35,113 9/9/2018 1,200 15 0.02 33,980 9/10/2018 1,280 15 0.67 36,246 9/11/2018 1,390 16 0.08 39,360 9/12/2018 1,790 16 0.00 50,687 9/13/2018 2,710 16 0.64 76,739 9/14/2018 3,500 17 6.37 99,109 9/15/2018 11,300 19 9.03 319,980 9/16/2018 27,600 22 6.07 781,545 9/17/2018 43,200 24 2.37 1,223,288 9/18/2018 56,800 0.00 1,608,397 9/19/2018 65,700 0.00 1,860,417 9/20/2018 73,700 30 0.00 2,086,952 9/21/2018 76,300 31 0.00 2,160,575 9/22/2018 75,400 30 0.00 2,135,090 9/23/2018 72,200 30 0.00 2,044,476 9/24/2018 65,800 28 0.00 1,863,249 9/25/2018 56,300 27 0.00 1,594,238 9/26/2018 42,300 24 0.00 1,197,803 9/27/2018 26,200 22 0.00 741,901 9/28/2018 18,000 20 0.00 509,703 9/29/2018 16,000 20 0.00 453,070 9/30/2018 16,200 20 0.00 458,733 10/1/2018 16,400 20 0.00 464,396 10/2/2018 16,000 20 0.00 453,070 10/3/2018 15,100 20 0.00 427,584 10/4/2018 14,300 20 0.00 404,931 10/5/2018 13,600 20 0.00 385,109 10/6/2018 13,000 19 0.04 368,119 10/7/2018 12,300 19 0.00 348,297 10/8/2018 11,600 19 0.07 328,475 10/9/2018 11,100 19 0.00 314,317 10/10/2018 10,400 19 0.16 294,495 10/11/2018 6,420 18 0.13 181,794 10/12/2018 4,530 17 0.00 128,275 10/13/2018 9,740 19 0.00 275,806 10/14/2018 13,500 20 0.00 382,277 Page 16 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 10/15/2018 14,500 20 0.00 410,594 10/16/2018 13,600 20 0.64 385,109 10/17/2018 12,500 19 0.09 353,961 10/18/2018 12,700 19 0.00 359,624 10/19/2018 12,900 19 0.00 365,287 10/20/2018 12,800 19 0.00 362,456 10/21/2018 12,300 19 0.00 348,297 10/22/2018 11,500 19 0.00 325,644 10/23/2018 10,900 19 0.00 308,654 10/24/2018 9,980 19 0.00 282,602 10/25/2018 8,600 18 0.00 243,525 10/26/2018 7,500 18 0.62 212,376 10/27/2018 7,200 18 0.00 203,881 10/28/2018 9,440 19 0.00 267,311 10/29/2018 12,500 19 0.00 353,961 10/30/2018 13,400 20 0.00 379,446 10/31/2018 12,600 19 0.00 356,792 11/1/2018 10,800 19 0.11 305,822 11/2/2018 8,860 18 0.02 250,887 11/3/2018 6,420 18 0.00 181,794 11/4/2018 5,680 18 0.07 160,840 11/5/2018 6,040 18 0.09 171,034 11/6/2018 6,020 18 0.16 170,467 11/7/2018 7,880 18 0.12 223,137 11/8/2018 10,700 19 0.96 302,990 11/9/2018 10,100 19 0.00 286,000 11/10/2018 9,320 19 0.01 263,913 11/11/2018 8,980 19 0.00 254,285 11/12/2018 8,560 18 0.20 242,392 11/13/2018 9,740 19 0.30 275,806 11/14/2018 15,700 20 0.02 444,574 11/15/2018 20,600 21 0.23 583,327 11/16/2018 27,400 22 0.00 775,882 11/17/2018 34,700 23 0.00 982,595 11/18/2018 39,500 24 0.00 1,118,515 11/19/2018 39,200 24 0.44 1,110,020 11/20/2018 33,800 23 0.00 957,109 11/21/2018 26,500 22 0.00 750,396 11/22/2018 21,600 21 0.01 611,644 11/23/2018 19,200 21 0.00 543,683 11/24/2018 16,700 20 0.49 472,891 Page 17 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 11/25/2018 15,200 20 0.00 430,416 11/26/2018 15,600 20 0.03 441,743 11/27/2018 16,300 20 0.00 461,565 11/28/2018 16,900 20 0.00 478,555 11/29/2018 17,000 20 0.00 481,386 11/30/2018 17,100 20 0.00 484,218 12/1/2018 17,300 20 0.61 489,881 12/2/2018 17,600 20 0.05 498,377 12/3/2018 18,300 20 0.01 518,198 12/4/2018 19,000 21 0.00 538,020 12/5/2018 19,500 21 0.00 552,179 12/6/2018 19,600 21 0.00 555,010 12/7/2018 19,100 21 0.00 540,852 12/8/2018 17,400 20 0.74 492,713 12/9/2018 14,800 20 1.16 419,089 12/10/2018 14,600 20 0.21 413,426 12/11/2018 17,400 20 0.01 492,713 12/12/2018 19,900 21 0.00 563,505 12/13/2018 21,400 21 0.00 605,981 12/14/2018 21,500 21 1.87 608,812 12/15/2018 20,200 21 0.42 572,000 12/16/2018 19,600 21 0.01 555,010 12/17/2018 20,600 21 0.00 583,327 12/18/2018 21,600 21 0.00 611,644 12/19/2018 21,800 21 0.00 617,307 12/20/2018 20,800 21 0.37 588,990 12/21/2018 18,900 21 0.26 535,188 12/22/2018 17,600 20 0.00 498,377 12/23/2018 18,600 20 0.01 526,693 12/24/2018 19,800 21 0.00 560,674 12/25/2018 20,300 21 0.00 574,832 12/26/2018 19,900 21 0.00 563,505 12/27/2018 18,800 21 0.04 532,357 12/28/2018 18,100 20 0.79 512,535 12/29/2018 17,300 20 0.00 489,881 12/30/2018 17,500 20 0.21 495,545 12/31/2018 19,100 21 0.00 540,852 1/1/2019 20,300 21 0.00 574,832 1/2/2019 21,000 21 0.02 594,654 1/3/2019 21,200 21 0.03 600,317 1/4/2019 21,000 21 0.31 594,654 Page 18 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 1/5/2019 21,000 21 0.00 594,654 1/6/2019 21,300 21 0.00 603,149 1/7/2019 21,600 21 0.00 611,644 1/8/2019 21,800 21 0.00 617,307 1/9/2019 21,300 21 0.00 603,149 1/10/2019 20,900 21 0.00 591,822 1/11/2019 20,500 21 0.00 580,495 1/12/2019 20,000 21 0.00 566,337 1/13/2019 19,400 21 0.25 549,347 1/14/2019 19,000 21 0.00 538,020 1/15/2019 19,500 21 0.00 552,179 1/16/2019 20,200 21 0.00 572,000 1/17/2019 20,500 21 0.12 580,495 1/18/2019 20,000 21 0.01 566,337 1/19/2019 18,200 20 0.00 515,367 1/20/2019 14,500 20 0.15 410,594 1/21/2019 11,600 19 0.00 328,475 1/22/2019 11,900 19 0.00 336,970 1/23/2019 12,300 19 0.00 348,297 1/24/2019 12,800 0.68 362,456 1/25/2019 14,500 0.00 410,594 1/26/2019 16,700 0.00 472,891 1/27/2019 18,400 0.00 521,030 1/28/2019 17,900 0.00 506,872 1/29/2019 16,200 0.00 458,733 1/30/2019 14,800 20 0.00 419,089 1/31/2019 13,600 19 0.00 385,109 2/1/2019 12,500 19 0.00 353,961 2/2/2019 10,200 19 0.00 288,832 2/3/2019 7,860 18 0.11 222,570 2/4/2019 6,900 18 0.01 195,386 2/5/2019 6,360 17 0.00 180,095 2/6/2019 5,740 17 0.00 162,539 2/7/2019 5,310 17 0.00 150,362 2/8/2019 5,110 17 0.00 144,699 2/9/2019 4,820 17 0.00 136,487 2/10/2019 4,430 17 0.00 125,444 2/11/2019 4,230 17 0.47 119,780 2/12/2019 4,300 17 0.01 121,762 2/13/2019 4,750 17 0.03 134,505 2/14/2019 5,350 17 0.00 151,495 Page 19 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 2/15/2019 5,960 17 0.00 168,768 2/16/2019 7,210 18 0.25 204,164 2/17/2019 8,680 18 0.00 245,790 2/18/2019 11,300 19 0.02 319,980 2/19/2019 13,000 19 0.10 368,119 2/20/2019 14,100 20 0.20 399,268 2/21/2019 14,700 20 0.00 416,258 2/22/2019 15,700 20 0.14 444,574 2/23/2019 17,100 20 0.10 484,218 2/24/2019 18,600 21 0.01 526,693 2/25/2019 19,900 21 0.00 563,505 2/26/2019 21,100 21 0.00 597,485 2/27/2019 21,800 21 0.00 617,307 2/28/2019 20,600 21 0.00 583,327 3/1/2019 18,500 20 0.53 523,862 3/2/2019 16,900 20 0.15 478,555 3/3/2019 16,500 20 0.51 467,228 3/4/2019 16,800 20 0.09 475,723 3/5/2019 17,000 20 0.28 481,386 3/6/2019 17,700 20 0.00 501,208 3/7/2019 17,500 20 0.00 495,545 3/8/2019 16,000 20 0.24 453,070 3/9/2019 15,400 20 0.02 436,079 3/10/2019 15,900 20 0.00 450,238 3/11/2019 16,700 20 0.00 472,891 3/12/2019 17,200 20 0.00 487,050 3/13/2019 17,400 20 0.00 492,713 3/14/2019 17,400 20 0.00 492,713 3/15/2019 17,100 20 0.00 484,218 3/16/2019 16,700 20 0.00 472,891 3/17/2019 16,400 20 0.00 464,396 3/18/2019 16,100 20 0.00 455,901 3/19/2019 15,900 20 0.00 450,238 3/20/2019 15,500 20 0.23 438,911 3/21/2019 14,500 20 0.22 410,594 3/22/2019 12,900 19 0.01 365,287 3/23/2019 13,600 19 0.00 385,109 3/24/2019 14,400 20 0.00 407,763 3/25/2019 13,300 19 0.01 376,614 3/26/2019 11,700 19 0.05 331,307 3/27/2019 11,400 19 0.00 322,812 Page 20 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 3/28/2019 11,900 19 0.00 336,970 3/29/2019 12,000 19 0.00 339,802 3/30/2019 11,400 19 0.00 322,812 3/31/2019 8,160 18 0.00 231,065 4/1/2019 5,650 17 0.00 159,990 4/2/2019 5,160 17 1.21 146,115 4/3/2019 6,220 17 0.00 176,131 4/4/2019 7,180 18 0.00 203,315 4/5/2019 7,280 18 1.24 206,147 4/6/2019 8,090 18 0.07 229,083 4/7/2019 9,490 18 0.00 268,727 4/8/2019 11,200 19 0.00 317,149 4/9/2019 10,700 19 0.02 302,990 4/10/2019 12,600 19 0.00 356,792 4/11/2019 15,800 20 0.00 447,406 4/12/2019 16,500 20 0.65 467,228 4/13/2019 15,800 20 0.04 447,406 4/14/2019 17,100 20 0.01 484,218 4/15/2019 19,500 21 0.00 552,179 4/16/2019 21,100 21 0.00 597,485 4/17/2019 21,900 21 0.00 620,139 4/18/2019 20,800 21 0.00 588,990 4/19/2019 17,300 20 1.35 489,881 4/20/2019 13,300 19 0.00 376,614 4/21/2019 12,000 19 0.00 339,802 4/22/2019 13,000 19 0.00 368,119 4/23/2019 12,400 19 0.00 351,129 4/24/2019 13,000 19 0.00 368,119 4/25/2019 13,800 20 0.00 390,772 4/26/2019 14,000 20 0.07 396,436 4/27/2019 13,700 20 0.00 387,941 4/28/2019 13,300 19 0.00 376,614 4/29/2019 12,900 19 0.00 365,287 4/30/2019 12,500 19 0.00 353,961 5/1/2019 12,200 19 0.00 345,466 5/2/2019 11,800 19 0.00 334,139 5/3/2019 11,600 19 0.00 328,475 5/4/2019 11,300 19 0.00 319,980 5/5/2019 10,600 19 0.13 300,159 5/6/2019 10,200 19 0.00 288,832 5/7/2019 10,500 19 0.00 297,327 Page 21 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 5/8/2019 10,100 19 0.00 286,000 5/9/2019 8,000 18 0.00 226,535 5/10/2019 5,390 17 0.00 152,628 5/11/2019 3,740 17 0.00 105,905 5/12/2019 3,070 16 0.16 86,933 5/13/2019 2,910 16 0.00 82,402 5/14/2019 2,870 16 0.00 81,269 5/15/2019 2,990 16 0.00 84,667 5/16/2019 3,120 16 0.00 88,349 5/17/2019 3,260 16 0.00 92,313 5/18/2019 3,190 16 0.00 90,331 5/19/2019 2,730 16 0.00 77,305 5/20/2019 2,320 16 0.00 65,695 5/21/2019 2,110 16 0.00 59,749 5/22/2019 1,920 16 0.00 54,368 5/23/2019 1,790 16 0.00 50,687 5/24/2019 1,700 15 0.00 48,139 5/25/2019 1,590 15 0.00 45,024 5/26/2019 1,550 15 0.00 43,891 5/27/2019 1,440 15 0.00 40,776 5/28/2019 1,380 15 0.00 39,077 5/29/2019 1,340 15 0.00 37,945 5/30/2019 1,280 15 0.00 36,246 5/31/2019 1,280 15 0.01 36,246 6/1/2019 1,320 15 0.00 37,378 6/2/2019 1,290 15 0.00 36,529 6/3/2019 1,240 15 0.00 35,113 6/4/2019 1,120 15 0.00 31,715 6/5/2019 1,020 15 0.05 28,883 6/6/2019 1,220 15 0.01 34,547 6/7/2019 1,360 15 0.54 38,511 6/8/2019 1,490 15 1.40 42,192 6/9/2019 2,090 16 0.59 59,182 6/10/2019 4,140 17 0.03 117,232 6/11/2019 8,110 18 0.01 229,650 6/12/2019 10,300 19 0.16 291,664 6/13/2019 10,400 19 0.19 294,495 6/14/2019 9,290 18 0.00 263,064 6/15/2019 8,460 18 0.00 239,561 6/16/2019 8,180 18 0.00 231,632 6/17/2019 7,750 18 0.00 219,456 Page 22 of 23 August 2019 APPENDIX B-3 SUMMARY OF FLOW IN CAPE FEAR RIVER AT LOCK #1 NR KELLY, NC Chemours Fayetteville Works, North Carolina Geosyntec Consultatns of NC, P.C. Date USGS Reported Average Discharge1 (cfs) USGS Reported Average Gage Height1 (ft) USGS Reported Total Precipitation1,2 (inches) USGS Reported Average Discharge (L/s) 6/18/2019 7,040 18 0.06 199,351 6/19/2019 6,400 18 0.00 181,228 6/20/2019 4,990 17 0.03 141,301 6/21/2019 3,820 17 0.00 108,170 6/22/2019 3,310 16 0.06 93,729 6/23/2019 3,020 16 0.00 85,517 6/24/2019 2,800 16 0.00 79,287 6/25/2019 3,190 16 0.00 90,331 6/26/2019 3,490 16 0.00 98,826 6/27/2019 2,910 16 0.00 82,402 6/28/2019 2,080 16 0.00 58,899 6/29/2019 1,600 15 0.00 45,307 6/30/2019 1,380 15 0.00 39,077 7/1/2019 1,320 15 0.00 37,378 7/2/2019 1,260 15 0.00 35,679 7/3/2019 1,230 15 1.07 34,830 7/4/2019 1,270 15 0.06 35,962 7/5/2019 2,030 16 0.36 57,483 7/6/2019 2,600 16 0.03 73,624 7/7/2019 2,330 16 0.01 65,978 7/8/2019 1,920 16 1.58 54,368 7/9/2019 2,020 16 2.36 57,200 7/10/2019 2,310 16 0.00 65,412 7/11/2019 2,250 16 0.25 63,713 7/12/2019 2,130 16 0.00 60,315 7/13/2019 3,050 16 2.67 86,366 7/14/2019 3,410 16 0.00 96,560 7/15/2019 2,810 16 0.00 79,570 7/16/2019 2,370 16 0.00 67,111 7/17/2019 1,920 16 0.00 54,368 7/18/2019 1,580 15 0.08 44,741 7/19/2019 1,380 15 0.00 39,077 7/20/2019 1,430 15 0.00 40,493 7/21/2019 1,380 15 0.00 39,077 7/22/2019 1,350 15 0.00 38,228 7/23/2019 1,460 15 0.68 41,343 7/24/2019 1,840 16 0.00 52,103 Notes: cfs: cubic feet per L/s: Liter per second. ft: feet.USGS - United States Geological Survey. 1) Measurements are recorded from the USGS flow gauging station at the Lock #1 near Kelly, ID 02105769 (USGS, 2019). 2) The minimum value recorded by a USGS raingage is 0.01 inches. Anything detected below this threshold is recorded as 0 inches. Page 23 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 1/1/2017 11.6 509 1/2/2017 14.3 626 1/3/2017 14.0 613 1/4/2017 10.8 474 1/5/2017 11.4 500 1/6/2017 16.2 710 1/7/2017 17.5 766 1/8/2017 16.0 702 1/9/2017 15.6 681 1/10/2017 15.7 687 1/11/2017 16.2 710 1/12/2017 15.7 688 1/13/2017 15.6 684 1/14/2017 15.9 696 1/15/2017 15.7 687 1/16/2017 15.8 693 1/17/2017 15.9 696 1/18/2017 15.5 680 1/19/2017 16.6 729 1/20/2017 16.0 699 1/21/2017 15.8 693 1/22/2017 15.0 659 1/23/2017 15.6 685 1/24/2017 16.1 706 1/25/2017 15.6 685 1/26/2017 17.3 758 1/27/2017 14.3 625 1/28/2017 16.1 703 1/29/2017 15.8 694 1/30/2017 16.2 708 1/31/2017 15.5 679 2/1/2017 15.4 674 2/2/2017 16.0 699 2/3/2017 15.5 680 2/4/2017 16.2 712 2/5/2017 15.5 677 2/6/2017 16.0 701 2/7/2017 15.8 693 2/8/2017 14.7 642 Page 1 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 2/9/2017 11.3 495 2/10/2017 11.2 490 2/11/2017 9.6 419 2/12/2017 9.7 425 2/13/2017 10.7 470 2/14/2017 10.4 456 2/15/2017 12.3 539 2/16/2017 11.6 509 2/17/2017 11.0 482 2/18/2017 10.9 477 2/19/2017 10.1 441 2/20/2017 10.0 436 2/21/2017 11.6 510 2/22/2017 9.7 424 2/23/2017 9.9 433 2/24/2017 15.7 686 2/25/2017 17.0 744 2/26/2017 15.9 696 2/27/2017 17.1 749 2/28/2017 17.7 775 3/1/2017 18.2 797 3/2/2017 17.8 780 3/3/2017 16.6 727 3/4/2017 15.9 697 3/5/2017 12.9 564 3/6/2017 12.2 532 3/7/2017 12.4 544 3/8/2017 15.1 661 3/9/2017 12.3 539 3/10/2017 11.2 491 3/11/2017 9.5 417 3/12/2017 10.5 461 3/13/2017 14.6 638 3/14/2017 10.9 477 3/15/2017 12.3 538 3/16/2017 13.6 596 3/17/2017 14.3 626 3/18/2017 13.5 594 3/19/2017 14.1 617 3/20/2017 13.5 591 Page 2 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 3/21/2017 10.6 465 3/22/2017 10.3 450 3/23/2017 10.8 473 3/24/2017 12.0 526 3/25/2017 10.6 464 3/26/2017 12.6 554 3/27/2017 13.5 590 3/28/2017 12.4 542 3/29/2017 10.9 477 3/30/2017 14.8 646 3/31/2017 14.8 650 4/1/2017 11.5 503 4/2/2017 13.1 574 4/3/2017 11.9 523 4/4/2017 10.8 474 4/5/2017 12.8 560 4/6/2017 12.4 542 4/7/2017 12.2 535 4/8/2017 13.4 589 4/9/2017 19.9 873 4/10/2017 20.6 901 4/11/2017 20.5 898 4/12/2017 21.8 954 4/13/2017 20.9 915 4/14/2017 22.2 972 4/15/2017 20.6 904 4/16/2017 20.7 909 4/17/2017 20.5 898 4/18/2017 19.5 854 4/19/2017 18.5 810 4/20/2017 19.9 872 4/21/2017 19.2 840 4/22/2017 19.7 863 4/23/2017 18.0 791 4/24/2017 25.5 1,117 4/25/2017 13.9 609 4/26/2017 10.6 463 4/27/2017 9.9 434 4/28/2017 11.8 519 4/29/2017 11.8 516 Page 3 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 4/30/2017 16.2 709 5/1/2017 17.5 766 5/2/2017 16.4 720 5/3/2017 16.5 723 5/4/2017 18.9 826 5/5/2017 19.1 837 5/6/2017 14.9 655 5/7/2017 15.0 656 5/8/2017 17.0 746 5/9/2017 15.6 684 5/10/2017 17.5 768 5/11/2017 15.9 697 5/12/2017 18.5 810 5/13/2017 14.6 639 5/14/2017 15.7 688 5/15/2017 23.5 1,031 5/16/2017 29.6 1,297 5/17/2017 20.7 909 5/18/2017 22.9 1,005 5/19/2017 22.0 962 5/20/2017 22.6 989 5/21/2017 23.4 1,024 5/22/2017 25.3 1,107 5/23/2017 23.4 1,026 5/24/2017 24.0 1,050 5/25/2017 22.2 972 5/26/2017 21.6 948 5/27/2017 21.9 961 5/28/2017 23.3 1,020 5/29/2017 21.5 942 5/30/2017 22.5 984 5/31/2017 21.7 949 6/1/2017 21.1 924 6/2/2017 22.5 987 6/3/2017 21.8 953 6/4/2017 22.0 965 6/5/2017 26.5 1,160 6/6/2017 22.4 983 6/7/2017 22.1 967 6/8/2017 21.4 938 Page 4 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 6/9/2017 21.6 948 6/10/2017 21.5 941 6/11/2017 22.0 962 6/12/2017 22.7 994 6/13/2017 22.4 983 6/14/2017 22.1 969 6/15/2017 24.3 1,063 6/16/2017 23.8 1,045 6/17/2017 23.8 1,044 6/18/2017 22.9 1,005 6/19/2017 22.9 1,005 6/20/2017 23.9 1,049 6/21/2017 19.0 832 6/22/2017 22.8 1,000 6/23/2017 22.2 973 6/24/2017 26.8 1,172 6/25/2017 21.6 946 6/26/2017 20.6 902 6/27/2017 21.3 934 6/28/2017 19.4 852 6/29/2017 21.0 919 6/30/2017 24.8 1,085 7/1/2017 21.7 949 7/2/2017 22.1 969 7/3/2017 23.3 1,023 7/4/2017 21.8 956 7/5/2017 23.7 1,039 7/6/2017 23.7 1,039 7/7/2017 24.3 1,063 7/8/2017 24.7 1,082 7/9/2017 23.6 1,032 7/10/2017 25.0 1,095 7/11/2017 23.6 1,032 7/12/2017 24.1 1,057 7/13/2017 24.0 1,052 7/14/2017 23.7 1,037 7/15/2017 24.1 1,057 7/16/2017 24.0 1,052 7/17/2017 24.2 1,062 7/18/2017 24.4 1,068 Page 5 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 7/19/2017 24.2 1,060 7/20/2017 24.5 1,073 7/21/2017 24.5 1,071 7/22/2017 25.0 1,096 7/23/2017 23.9 1,046 7/24/2017 26.8 1,175 7/25/2017 22.4 981 7/26/2017 24.5 1,075 7/27/2017 24.8 1,087 7/28/2017 24.5 1,074 7/29/2017 24.0 1,051 7/30/2017 25.2 1,102 7/31/2017 23.8 1,043 8/1/2017 23.5 1,028 8/2/2017 22.1 966 8/3/2017 23.1 1,011 8/4/2017 23.2 1,016 8/5/2017 23.6 1,035 8/6/2017 23.9 1,045 8/7/2017 24.4 1,068 8/8/2017 24.5 1,072 8/9/2017 22.6 991 8/10/2017 23.8 1,044 8/11/2017 24.1 1,056 8/12/2017 23.7 1,039 8/13/2017 27.0 1,181 8/14/2017 23.6 1,034 8/15/2017 23.1 1,012 8/16/2017 25.0 1,097 8/17/2017 25.6 1,121 8/18/2017 25.0 1,097 8/19/2017 24.7 1,081 8/20/2017 26.8 1,174 8/21/2017 24.9 1,089 8/22/2017 26.3 1,154 8/23/2017 26.7 1,169 8/24/2017 26.1 1,144 8/25/2017 25.6 1,123 8/26/2017 25.0 1,096 8/27/2017 25.3 1,109 Page 6 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 8/28/2017 25.0 1,094 8/29/2017 24.6 1,079 8/30/2017 25.0 1,096 8/31/2017 25.1 1,099 9/1/2017 26.5 1,160 9/2/2017 24.4 1,069 9/3/2017 24.8 1,085 9/4/2017 22.7 993 9/5/2017 24.8 1,085 9/6/2017 25.0 1,095 9/7/2017 23.9 1,046 9/8/2017 23.5 1,031 9/9/2017 21.1 926 9/10/2017 21.1 924 9/11/2017 21.8 954 9/12/2017 22.2 974 9/13/2017 21.5 944 9/14/2017 22.4 980 9/15/2017 21.1 925 9/16/2017 21.7 951 9/17/2017 21.2 929 9/18/2017 22.3 976 9/19/2017 21.8 956 9/20/2017 22.4 981 9/21/2017 22.1 970 9/22/2017 20.4 894 9/23/2017 17.7 777 9/24/2017 17.6 772 9/25/2017 16.8 737 9/26/2017 19.7 862 9/27/2017 21.9 958 9/28/2017 22.4 983 9/29/2017 21.6 945 9/30/2017 20.8 909 10/1/2017 21.9 961 10/2/2017 19.1 838 10/3/2017 19.0 834 10/4/2017 21.1 927 10/5/2017 21.3 935 10/6/2017 20.5 897 Page 7 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 10/7/2017 25.1 1,100 10/8/2017 22.0 963 10/9/2017 20.5 897 10/10/2017 20.8 910 10/11/2017 20.6 902 10/12/2017 20.3 889 10/13/2017 15.7 690 10/14/2017 14.7 644 10/15/2017 14.6 639 10/16/2017 16.3 713 10/17/2017 4.6 203 10/18/2017 0.0 0 10/19/2017 0.0 0 10/20/2017 0.0 0 10/21/2017 0.0 0 10/22/2017 0.0 0 10/23/2017 0.7 30 10/24/2017 0.0 0 10/25/2017 0.0 0 10/26/2017 0.0 0 10/27/2017 2.2 98 10/28/2017 3.8 167 10/29/2017 8.9 391 10/30/2017 8.9 388 10/31/2017 9.0 392 11/1/2017 10.3 450 11/2/2017 22.0 963 11/3/2017 27.5 1,205 11/4/2017 28.9 1,264 11/5/2017 28.3 1,242 11/6/2017 29.3 1,285 11/7/2017 27.3 1,197 11/8/2017 20.1 883 11/9/2017 24.7 1,080 11/10/2017 24.7 1,083 11/11/2017 23.4 1,026 11/12/2017 24.5 1,074 11/13/2017 24.5 1,075 11/14/2017 24.4 1,069 11/15/2017 24.1 1,056 Page 8 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 11/16/2017 24.0 1,053 11/17/2017 25.4 1,111 11/18/2017 23.8 1,042 11/19/2017 24.8 1,086 11/20/2017 23.3 1,022 11/21/2017 24.1 1,057 11/22/2017 24.3 1,063 11/23/2017 24.0 1,052 11/24/2017 24.4 1,067 11/25/2017 24.3 1,066 11/26/2017 25.6 1,123 11/27/2017 23.9 1,048 11/28/2017 24.7 1,084 11/29/2017 23.5 1,028 11/30/2017 24.3 1,063 12/1/2017 23.1 1,012 12/2/2017 24.1 1,057 12/3/2017 24.0 1,053 12/4/2017 23.2 1,018 12/5/2017 23.1 1,010 12/6/2017 23.9 1,047 12/7/2017 23.4 1,024 12/8/2017 28.8 1,263 12/9/2017 24.0 1,050 12/10/2017 25.3 1,109 12/11/2017 22.2 974 12/12/2017 23.7 1,037 12/13/2017 23.7 1,040 12/14/2017 23.7 1,039 12/15/2017 23.4 1,023 12/16/2017 24.5 1,072 12/17/2017 24.0 1,052 12/18/2017 24.6 1,076 12/19/2017 24.3 1,066 12/20/2017 25.4 1,111 12/21/2017 12.5 547 12/22/2017 14.2 620 12/23/2017 12.5 547 12/24/2017 13.6 597 12/25/2017 12.3 539 Page 9 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 12/26/2017 12.4 542 12/27/2017 10.7 468 12/28/2017 15.5 677 12/29/2017 13.1 575 12/30/2017 14.0 613 12/31/2017 13.5 590 1/1/2018 15.9 695 1/2/2018 17.4 762 1/3/2018 19.4 851 1/4/2018 19.5 856 1/5/2018 18.1 793 1/6/2018 20.0 876 1/7/2018 18.1 793 1/8/2018 14.2 621 1/9/2018 13.9 607 1/10/2018 16.2 712 1/11/2018 18.6 815 1/12/2018 19.0 834 1/13/2018 19.9 873 1/14/2018 21.2 930 1/15/2018 16.7 730 1/16/2018 17.2 755 1/17/2018 19.0 831 1/18/2018 15.4 674 1/19/2018 17.3 759 1/20/2018 16.8 736 1/21/2018 16.9 739 1/22/2018 17.4 761 1/23/2018 15.3 669 1/24/2018 18.1 793 1/25/2018 20.9 914 1/26/2018 17.4 760 1/27/2018 18.8 825 1/28/2018 20.7 906 1/29/2018 20.4 896 1/30/2018 18.1 793 1/31/2018 17.8 781 2/1/2018 18.6 814 2/2/2018 19.4 849 2/3/2018 18.4 805 Page 10 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 2/4/2018 21.2 928 2/5/2018 18.6 814 2/6/2018 19.1 838 2/7/2018 18.5 811 2/8/2018 16.3 715 2/9/2018 18.7 817 2/10/2018 19.6 858 2/11/2018 19.6 858 2/12/2018 18.8 824 2/13/2018 19.1 836 2/14/2018 19.4 848 2/15/2018 19.3 846 2/16/2018 19.4 849 2/17/2018 19.8 868 2/18/2018 19.5 853 2/19/2018 19.5 854 2/20/2018 18.9 830 2/21/2018 19.3 845 2/22/2018 18.4 808 2/23/2018 11.6 508 2/24/2018 10.8 472 2/25/2018 10.9 479 2/26/2018 10.7 470 2/27/2018 11.0 481 2/28/2018 11.1 486 3/1/2018 12.0 528 3/2/2018 11.2 493 3/3/2018 10.1 441 3/4/2018 11.8 515 3/5/2018 7.9 345 3/6/2018 9.8 427 3/7/2018 9.4 410 3/8/2018 9.3 407 3/9/2018 9.0 396 3/10/2018 9.2 405 3/11/2018 9.7 424 3/12/2018 10.6 462 3/13/2018 9.1 400 3/14/2018 9.0 395 3/15/2018 9.6 421 Page 11 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 3/16/2018 10.2 447 3/17/2018 12.2 536 3/18/2018 13.9 610 3/19/2018 13.1 572 3/20/2018 12.0 527 3/21/2018 12.6 552 3/22/2018 14.1 618 3/23/2018 13.5 593 3/24/2018 12.1 530 3/25/2018 13.3 581 3/26/2018 13.7 601 3/27/2018 12.8 563 3/28/2018 12.6 553 3/29/2018 12.7 554 3/30/2018 14.3 626 3/31/2018 16.2 711 4/1/2018 16.3 715 4/2/2018 17.4 764 4/3/2018 18.6 814 4/4/2018 18.0 788 4/5/2018 18.1 793 4/6/2018 18.8 826 4/7/2018 19.3 846 4/8/2018 15.7 690 4/9/2018 17.9 784 4/10/2018 16.8 735 4/11/2018 16.5 723 4/12/2018 14.8 649 4/13/2018 15.3 672 4/14/2018 18.6 815 4/15/2018 18.6 815 4/16/2018 19.4 848 4/17/2018 18.8 825 4/18/2018 16.4 719 4/19/2018 23.6 1,035 4/20/2018 17.3 756 4/21/2018 21.2 930 4/22/2018 20.4 896 4/23/2018 19.8 867 4/24/2018 16.0 703 Page 12 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 4/25/2018 14.2 620 4/26/2018 12.5 548 4/27/2018 18.4 808 4/28/2018 17.4 760 4/29/2018 17.8 782 4/30/2018 18.1 793 5/1/2018 17.5 767 5/2/2018 19.8 866 5/3/2018 20.5 899 5/4/2018 20.9 917 5/5/2018 21.4 939 5/6/2018 22.3 975 5/7/2018 21.0 919 5/8/2018 20.2 883 5/9/2018 22.9 1,004 5/10/2018 20.8 910 5/11/2018 21.6 948 5/12/2018 21.9 959 5/13/2018 20.0 878 5/14/2018 21.6 948 5/15/2018 20.4 892 5/16/2018 20.1 878 5/17/2018 23.1 1,013 5/18/2018 21.0 919 5/19/2018 20.9 915 5/20/2018 19.4 851 5/21/2018 20.7 905 5/22/2018 20.2 885 5/23/2018 19.4 852 5/24/2018 30.0 1,313 5/25/2018 22.2 973 5/26/2018 23.9 1,046 5/27/2018 22.8 998 5/28/2018 24.2 1,061 5/29/2018 24.1 1,057 5/30/2018 22.7 995 5/31/2018 22.7 994 6/1/2018 23.1 1,014 6/2/2018 22.2 975 6/3/2018 23.0 1,008 Page 13 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 6/4/2018 22.7 993 6/5/2018 22.5 986 6/6/2018 22.0 963 6/7/2018 22.2 972 6/8/2018 23.7 1,037 6/9/2018 22.4 982 6/10/2018 22.7 997 6/11/2018 25.0 1,095 6/12/2018 24.9 1,090 6/13/2018 22.6 988 6/14/2018 23.5 1,029 6/15/2018 22.9 1,005 6/16/2018 22.3 979 6/17/2018 23.6 1,032 6/18/2018 23.5 1,030 6/19/2018 21.7 951 6/20/2018 30.3 1,327 6/21/2018 20.2 884 6/22/2018 26.1 1,142 6/23/2018 25.4 1,113 6/24/2018 25.8 1,130 6/25/2018 26.1 1,145 6/26/2018 29.3 1,285 6/27/2018 26.2 1,147 6/28/2018 26.5 1,161 6/29/2018 28.1 1,231 6/30/2018 28.1 1,232 7/1/2018 28.3 1,239 7/2/2018 26.6 1,165 7/3/2018 25.2 1,105 7/4/2018 26.2 1,150 7/5/2018 27.1 1,186 7/6/2018 26.3 1,151 7/7/2018 26.1 1,142 7/8/2018 25.4 1,114 7/9/2018 27.0 1,182 7/10/2018 26.2 1,146 7/11/2018 26.1 1,141 7/12/2018 26.4 1,158 7/13/2018 25.5 1,118 Page 14 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 7/14/2018 26.8 1,174 7/15/2018 27.7 1,212 7/16/2018 26.0 1,140 7/17/2018 27.3 1,195 7/18/2018 27.0 1,183 7/19/2018 27.3 1,195 7/20/2018 28.7 1,256 7/21/2018 27.8 1,220 7/22/2018 27.2 1,193 7/23/2018 32.4 1,420 7/24/2018 23.3 1,019 7/25/2018 28.3 1,241 7/26/2018 25.4 1,111 7/27/2018 29.4 1,290 7/28/2018 28.6 1,254 7/29/2018 29.0 1,271 7/30/2018 29.0 1,270 7/31/2018 27.7 1,214 8/1/2018 27.7 1,212 8/2/2018 27.5 1,205 8/3/2018 28.3 1,238 8/4/2018 24.4 1,071 8/5/2018 23.2 1,017 8/6/2018 23.7 1,037 8/7/2018 25.9 1,134 8/8/2018 26.5 1,161 8/9/2018 23.0 1,006 8/10/2018 26.4 1,155 8/11/2018 25.7 1,125 8/12/2018 26.7 1,169 8/13/2018 24.6 1,080 8/14/2018 25.9 1,135 8/15/2018 26.2 1,147 8/16/2018 25.1 1,100 8/17/2018 25.3 1,107 8/18/2018 25.0 1,095 8/19/2018 25.2 1,105 8/20/2018 27.0 1,183 8/21/2018 24.6 1,076 8/22/2018 25.8 1,131 Page 15 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 8/23/2018 23.4 1,027 8/24/2018 25.5 1,119 8/25/2018 22.9 1,004 8/26/2018 26.0 1,138 8/27/2018 25.4 1,114 8/28/2018 27.0 1,183 8/29/2018 26.7 1,171 8/30/2018 26.5 1,159 8/31/2018 28.4 1,243 9/1/2018 26.3 1,150 9/2/2018 26.9 1,178 9/3/2018 28.8 1,262 9/4/2018 27.8 1,218 9/5/2018 28.3 1,239 9/6/2018 30.1 1,317 9/7/2018 25.2 1,104 9/8/2018 28.0 1,227 9/9/2018 25.4 1,112 9/10/2018 30.1 1,320 9/11/2018 28.0 1,225 9/12/2018 15.5 681 9/13/2018 14.1 618 9/14/2018 24.1 1,057 9/15/2018 32.0 1,403 9/16/2018 48.3 2,117 9/17/2018 11.4 500 9/18/2018 12.7 557 9/19/2018 18.4 804 9/20/2018 18.6 815 9/21/2018 18.1 792 9/22/2018 17.9 786 9/23/2018 23.4 1,026 9/24/2018 22.9 1,005 9/25/2018 22.7 993 9/26/2018 22.9 1,002 9/27/2018 25.9 1,133 9/28/2018 23.3 1,020 9/29/2018 24.8 1,086 9/30/2018 23.8 1,043 10/1/2018 23.3 1,021 Page 16 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 10/2/2018 24.6 1,078 10/3/2018 22.9 1,003 10/4/2018 22.9 1,003 10/5/2018 23.3 1,022 10/6/2018 24.7 1,080 10/7/2018 24.4 1,070 10/8/2018 22.5 984 10/9/2018 18.2 795 10/10/2018 16.6 728 10/11/2018 18.5 810 10/12/2018 3.0 133 10/13/2018 0.0 0 10/14/2018 0.0 0 10/15/2018 0.0 0 10/16/2018 0.0 0 10/17/2018 0.0 0 10/18/2018 0.0 0 10/19/2018 0.0 0 10/20/2018 0.0 0 10/21/2018 0.0 0 10/22/2018 21.6 946 10/23/2018 21.6 946 10/24/2018 21.6 946 10/25/2018 21.6 946 10/26/2018 21.6 946 10/27/2018 21.6 946 10/28/2018 21.6 946 10/29/2018 21.6 946 10/30/2018 21.6 946 10/31/2018 19.0 832 11/1/2018 18.3 803 11/2/2018 19.8 869 11/3/2018 19.3 845 11/4/2018 19.5 854 11/5/2018 19.7 863 11/6/2018 20.8 912 11/7/2018 19.1 835 11/8/2018 22.0 963 11/9/2018 21.8 953 11/10/2018 21.0 921 Page 17 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 11/11/2018 22.2 972 11/12/2018 30.6 1,342 11/13/2018 22.5 986 11/14/2018 22.7 995 11/15/2018 21.5 944 11/16/2018 22.1 968 11/17/2018 21.7 949 11/18/2018 21.0 919 11/19/2018 21.2 931 11/20/2018 21.6 948 11/21/2018 21.2 928 11/22/2018 21.7 951 11/23/2018 22.1 968 11/24/2018 23.9 1,047 11/25/2018 19.3 844 11/26/2018 19.3 845 11/27/2018 19.4 851 11/28/2018 19.7 865 11/29/2018 19.9 872 11/30/2018 20.1 882 12/1/2018 22.4 981 12/2/2018 19.9 870 12/3/2018 18.4 807 12/4/2018 19.0 831 12/5/2018 19.2 840 12/6/2018 19.2 842 12/7/2018 19.7 862 12/8/2018 21.0 918 12/9/2018 23.4 1,026 12/10/2018 20.4 893 12/11/2018 20.1 881 12/12/2018 19.0 834 12/13/2018 19.7 862 12/14/2018 26.1 1,144 12/15/2018 20.7 906 12/16/2018 20.2 883 12/17/2018 21.0 921 12/18/2018 14.9 653 12/19/2018 17.5 766 12/20/2018 19.3 847 Page 18 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 12/21/2018 17.8 779 12/22/2018 18.4 807 12/23/2018 18.9 829 12/24/2018 17.3 759 12/25/2018 18.4 805 12/26/2018 18.4 804 12/27/2018 17.7 778 12/28/2018 18.7 821 12/29/2018 18.9 826 12/30/2018 16.8 738 12/31/2018 17.8 779 1/1/2019 18.3 802 1/2/2019 18.1 793 1/3/2019 18.5 811 1/4/2019 20.8 912 1/5/2019 18.5 811 1/6/2019 18.4 808 1/7/2019 18.7 819 1/8/2019 18.9 829 1/9/2019 18.8 823 1/10/2019 18.6 815 1/11/2019 18.2 795 1/12/2019 19.6 860 1/13/2019 19.1 838 1/14/2019 19.5 855 1/15/2019 18.6 815 1/16/2019 19.0 831 1/17/2019 19.7 863 1/18/2019 19.6 857 1/19/2019 20.2 885 1/20/2019 20.1 880 1/21/2019 20.1 880 1/22/2019 18.7 819 1/23/2019 21.8 953 1/24/2019 17.4 761 1/25/2019 18.9 826 1/26/2019 19.5 854 1/27/2019 18.5 811 1/28/2019 19.0 832 1/29/2019 18.8 825 Page 19 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 1/30/2019 18.8 823 1/31/2019 12.8 560 2/1/2019 25.1 1,099 2/2/2019 19.2 842 2/3/2019 19.1 836 2/4/2019 18.7 821 2/5/2019 18.4 805 2/6/2019 20.5 899 2/7/2019 17.6 773 2/8/2019 19.2 843 2/9/2019 19.3 846 2/10/2019 19.6 858 2/11/2019 19.2 839 2/12/2019 21.6 947 2/13/2019 21.3 933 2/14/2019 22.3 976 2/15/2019 23.5 1,031 2/16/2019 22.2 973 2/17/2019 23.2 1,015 2/18/2019 22.0 962 2/19/2019 22.5 987 2/20/2019 22.8 1,001 2/21/2019 23.8 1,043 2/22/2019 23.7 1,037 2/23/2019 25.0 1,094 2/24/2019 20.1 883 2/25/2019 23.6 1,034 2/26/2019 22.9 1,005 2/27/2019 23.0 1,010 2/28/2019 22.8 999 3/1/2019 24.1 1,057 3/2/2019 23.1 1,011 3/3/2019 25.7 1,125 3/4/2019 23.8 1,042 3/5/2019 22.8 999 3/6/2019 23.9 1,047 3/7/2019 22.8 1,000 3/8/2019 24.0 1,049 3/9/2019 22.2 974 3/10/2019 23.5 1,031 Page 20 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 3/11/2019 23.3 1,021 3/12/2019 22.9 1,004 3/13/2019 22.7 993 3/14/2019 23.0 1,006 3/15/2019 23.9 1,045 3/16/2019 23.0 1,006 3/17/2019 22.7 994 3/18/2019 22.6 990 3/19/2019 22.7 995 3/20/2019 22.0 964 3/21/2019 22.1 969 3/22/2019 21.0 921 3/23/2019 22.9 1,004 3/24/2019 20.9 917 3/25/2019 21.7 953 3/26/2019 21.3 935 3/27/2019 21.3 933 3/28/2019 21.9 961 3/29/2019 22.0 964 3/30/2019 21.8 954 3/31/2019 23.1 1,014 4/1/2019 19.4 848 4/2/2019 22.9 1,005 4/3/2019 21.2 927 4/4/2019 22.7 994 4/5/2019 23.9 1,046 4/6/2019 22.2 972 4/7/2019 20.6 904 4/8/2019 21.2 929 4/9/2019 21.1 925 4/10/2019 22.2 971 4/11/2019 22.5 985 4/12/2019 23.2 1,016 4/13/2019 23.0 1,009 4/14/2019 22.7 996 4/15/2019 21.9 962 4/16/2019 22.0 964 4/17/2019 22.3 978 4/18/2019 21.6 945 4/19/2019 22.7 994 Page 21 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 4/20/2019 22.7 994 4/21/2019 21.8 955 4/22/2019 21.2 930 4/23/2019 21.6 947 4/24/2019 21.1 922 4/25/2019 21.1 926 4/26/2019 22.5 984 4/27/2019 20.5 899 4/28/2019 21.0 921 4/29/2019 20.7 907 4/30/2019 22.4 983 5/1/2019 22.6 989 5/2/2019 21.4 936 5/3/2019 21.9 958 5/4/2019 24.4 1,070 5/5/2019 21.4 939 5/6/2019 21.9 961 5/7/2019 22.0 964 5/8/2019 23.4 1,026 5/9/2019 22.4 979 5/10/2019 23.8 1,044 5/11/2019 22.3 978 5/12/2019 23.1 1,014 5/13/2019 16.8 735 5/14/2019 23.6 1,034 5/15/2019 20.7 905 5/16/2019 20.8 913 5/17/2019 22.2 971 5/18/2019 21.3 934 5/19/2019 23.0 1,006 5/20/2019 22.2 971 5/21/2019 23.6 1,034 5/22/2019 23.4 1,027 5/23/2019 24.4 1,071 5/24/2019 24.5 1,076 5/25/2019 25.1 1,098 5/26/2019 25.2 1,105 5/27/2019 25.3 1,107 5/28/2019 24.7 1,082 5/29/2019 25.9 1,134 Page 22 of 23 August 2019 APPENDIX B-4 SUMMARY OF OUTFALL 002 DAILY DISCHARGE RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. Date Outfall 002 Flow (MGD)* Outfall 002 Flow (L/s) 5/30/2019 27.4 1,200 5/31/2019 27.0 1,182 6/1/2019 25.3 1,108 6/2/2019 27.0 1,181 6/3/2019 26.9 1,177 6/4/2019 26.0 1,139 6/5/2019 27.7 1,214 6/6/2019 27.2 1,192 6/7/2019 26.4 1,155 6/8/2019 26.2 1,150 6/9/2019 33.5 1,466 6/10/2019 28.9 1,267 6/11/2019 28.9 1,267 6/12/2019 26.4 1,155 6/13/2019 25.1 1,099 6/14/2019 23.8 1,044 6/15/2019 24.2 1,059 6/16/2019 24.3 1,064 6/17/2019 24.0 1,053 6/18/2019 24.3 1,065 6/19/2019 24.3 1,063 6/20/2019 23.1 1,010 6/21/2019 24.3 1,064 6/22/2019 24.2 1,060 6/23/2019 23.6 1,035 6/24/2019 24.1 1,057 6/25/2019 23.2 1,017 6/26/2019 23.8 1,044 6/27/2019 24.2 1,061 6/28/2019 24.2 1,061 6/29/2019 23.8 1,043 6/30/2019 23.3 1,022 Notes: 1) *Data provided by Chemours Fayetteville Works. 3) L/s: Liter per second 2) MGD: Millions of gallons per day. Page 23 of 23 August 2019 Appendix C – Direct Aerial Deposition 1 August 2019 APPENDIX C SUPPORTING CALCULATIONS – DIRECT AERIAL DEPOSITION ON CAPE FEAR RIVER Appendix C – Direct Aerial Deposition 2 August 2019 INTRODUCTION AND OBJECTIVE Nine potential pathways (Table 1) were identified as potentially contributing to observed Cape Fear River per- and polyfluoroalkyl substances (PFAS) concentrations. These pathways include direct PFAS aerial deposition to the Cape Fear River. This pathway was identified as Transport Pathway Number 3 in the PFAS mass loading design (Section 4) of the Chemours Fayetteville Works Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes (Geosyntec, 2019). The mass loading from direct aerial deposition of PFAS to the Cape Fear River was estimated using air deposition modeling results for HFPO-DA (ERM, 2018). The objective of the supporting calculations presented in this appendix is to estimate aerial deposited PFAS directly on the Cape Fear River. APPROACH HFPO-DA mass loading directly to the Cape Fear River was first estimated using the reported aerial extent and deposition contours modeled for October 2018 (ERM, 2018). As depicted in (Table C-1), the HFPO-DA air loading data (ug/m2) provided from ERM (2018) was used to calculate the net hourly deposition rate (ng/m2/hr) using the following equation: 𝑁𝑁𝑁𝑁𝑁𝑁 ℎ𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜𝑜 𝑑𝑑𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑𝑑𝑑𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑 𝑜𝑜𝑟𝑟𝑁𝑁𝑁𝑁= 𝐴𝐴𝑑𝑑𝑜𝑜 𝑜𝑜𝑜𝑜𝑟𝑟𝑑𝑑𝑑𝑑𝑑𝑑𝑙𝑙𝑇𝑇𝑑𝑑𝑇𝑇𝑁𝑁 Depositional area along the river was calculated using available data for river width and computed river lengths where deposition contours were modeled. Eighteen (18) sections (Figure C-1) provided from FEMA (2007) were selected along the Cape Fear River to measure the average river width (m). Cross section width calculations are shown in Table C-2. As depicted in Figures C-2, C-3, C-4, C-5, and C-6, sections along the Cape Fear River with HFPO-DA concentrations contours ranging from 40 to 640 ug/m2 were selected, and the length of the Cape Fear River along each of the sections was measured. Section lengths and river widths were used to calculate section areas (m2) (Table C-3). Start and end deposition rates (ng/m2/hr) for each section along the Cape Fear River were estimated based on the deposition contours and corresponding net hourly deposition rate (Table C-1); a combined deposition rate for each section was calculated as the average of the start and end deposition rates. River velocity (m/hr) was estimated from measured flow rates and the calculated river cross sectional area. Section lengths were used to calculate HFPO-DA travel time based on the river velocity (Table C-3). Finally, as depicted in Table C-3, combined deposition rate (ng/m2/hr), section area (m2), and travel time (hr) were used to calculate mass HFPO-DA deposited (ng) as follows: 𝑀𝑀𝑟𝑟𝑑𝑑𝑑𝑑 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻−𝐷𝐷𝐴𝐴 𝑑𝑑𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑𝑑𝑑𝑁𝑁𝑁𝑁𝑑𝑑= 𝐶𝐶𝑜𝑜𝑇𝑇𝐶𝐶𝑑𝑑𝑑𝑑𝑁𝑁𝑑𝑑 𝑑𝑑𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑𝑑𝑑𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑 𝑜𝑜𝑟𝑟𝑁𝑁𝑁𝑁 𝑥𝑥 𝑆𝑆𝑁𝑁𝑆𝑆𝑁𝑁𝑑𝑑𝑜𝑜𝑑𝑑 𝑟𝑟𝑜𝑜𝑁𝑁𝑟𝑟 𝑥𝑥 𝑇𝑇𝑜𝑜𝑟𝑟𝑇𝑇𝑁𝑁𝑜𝑜 𝑁𝑁𝑑𝑑𝑇𝑇𝑁𝑁 Residential well data from six locations in the Granular Activated Carbon Pilot Well testing program (Chemours, 2019) were used to build a relationship between HFPO-DA and other PFAS compounds since modeled aerial deposition results are only available for HFPO-DA. The average ratios of measured HFPO-DA to other compounds across the six locations were used to Appendix C – Direct Aerial Deposition 3 August 2019 estimate mass loading of other PFAS compounds. This relationship is provided in Table E-3 of Appendix E. Appendix C – Direct Aerial Deposition 4 August 2019 REFERENCES Chemours, 2019. Residential Well Carbon Pilot Testing Data. Available at: https://www.chemours.com/Fayetteville-Works/en-us/c3-dimer-acid/compliance-testing/ ERM, 2018. Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Federal Emergency Management Agency (FEMA), 2007. "A Report of Flood Hazards in Bladen County, North Carolina and Incorporated Areas." (2007) Flood Insurance Study, Federal Emergency Management Agency. North Carolina Flood Risk Information System Engineering Model. Cape Fear River ADJ. HEC-RAS 5.0.7. Appendix C – Direct Aerial Deposition 1 August 2019 APPENDIX C TABLES TABLE C-1 NET HOURLY HFPO-DA DEPOSITION RATE Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. HFPO-DA Air Loading1 (µg/m2) HFPO-DA Air Loading (ng/m2) Time (year) Time (hour) HFPO-DA Net Hourly Deposition Rate (ng/m2/hr) 40 40,000 1 8,760 4.6 80 80,000 1 8,760 9.1 160 160,000 1 8,760 18.3 320 320,000 1 8,760 36.5 640 640,000 1 8,760 73.1 Notes: 2. Abbreviations HFPO-DA: Hexafluoropropylene oxide dimer acid; or dimer acid. ug/m2: micrograms per meter square. ng /L: nanograms per liter. ng/m2/hr: nanograms per meter square per hour. 1. HFPO-DA model values are from ERM (2018). Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Page 1 of 1 August 2019 TABLE C-2 ESTIMATION OF AVERAGE RIVER WIDTH Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Cross section ID*Model point ID**Easting (ft NAD83) Northing (ft NAD83) River Depth (ft NAVD88) Distance (ft) Cross Section Width (m) 0 2,052,368 399,949 38.75 0 1 2,052,366 399,949 38.22 2 2 2,052,334 399,946 28.90 34 3 2,052,254 399,938 7.90 114 4 2,052,155 399,928 7.90 213 5 2,052,095 399,922 28.90 273 6 2,052,093 399,922 31.58 275 18 2,053,460 394,655 29.54 0 19 2,053,436 394,649 27.24 24 20 2,053,281 394,613 23.00 179 21 2,053,277 394,612 22.15 183 22 2,053,180 394,590 1.00 280 23 2,053,079 394,566 1.00 381 24 2,052,977 394,543 23.00 483 25 2,052,949 394,536 28.11 512 26 2,052,924 394,531 30.19 536 7 2,053,113 396,901 39.02 0 8 2,053,070 396,895 28.07 43 9 2,052,990 396,886 7.07 122 10 2,052,891 396,874 7.07 222 11 2,052,831 396,867 28.07 281 12 2,052,815 396,865 36.27 298 21 2,053,373 393,937 29.14 0 22 2,053,349 393,931 21.75 24 23 2,053,271 393,913 0.75 102 24 2,053,174 393,891 0.75 200 25 2,053,115 393,877 21.75 258 26 2,053,081 393,869 33.29 292 13 2,053,209 394,897 26.00 0 14 2,053,130 394,878 4.59 80 15 2,053,032 394,854 4.59 177 16 2,052,974 394,840 26.00 235 17 2,052,961 394,837 36.39 248 31 2,053,769 390,652 22.07 0 32 2,053,729 390,645 1.07 40 33 2,053,643 390,630 1.07 126 34 2,053,602 390,623 22.07 167 35 2,053,572 390,618 25.37 197 27 2,053,560 392,482 0.75 0 28 2,053,430 392,455 0.75 129 29 2,053,370 392,443 21.75 190 30 2,053,322 392,433 45.09 238 1271 2,054,059 387,249 50.87 0 1272 2,054,022 387,215 39.63 37 1273 2,053,995 387,190 22.50 65 1274 2,053,946 387,145 -0.50 113 1275 2,053,861 387,067 -0.50 199 1276 2,053,812 387,023 22.50 247 1277 2,053,801 387,012 38.10 258 1278 2,053,727 386,945 72.26 332 1193 2,053,950 388,876 37.23 0 1194 2,053,902 388,874 21.86 49 1195 2,053,843 388,871 0.86 107 1196 2,053,717 388,866 0.86 233 1197 2,053,659 388,864 21.86 291 1198 2,053,650 388,863 30.55 300 1199 2,053,600 388,861 46.74 350 1271 2,054,059 387,249 50.87 0 1272 2,054,022 387,215 39.63 37 1273 2,053,995 387,190 22.50 65 1274 2,053,946 387,145 -0.50 113 1275 2,053,861 387,067 -0.50 199 1276 2,053,812 387,023 22.50 247 1277 2,053,801 387,012 38.10 258 1278 2,053,727 386,945 72.26 332 1498 2,057,643 382,269 37.28 0 1499 2,057,610 382,246 21.69 34 1500 2,057,556 382,208 -1.31 87 1501 2,057,461 382,141 -1.31 182 1502 2,057,408 382,103 21.69 236 1503 2,057,398 382,096 23.87 245 1504 2,057,358 382,067 34.27 286 612082 606667 608468 616535 613542 610240 84 163 91 89 76*** 60*** 606667 600052 619506 614224 614517 72 101 107 101 87 Page 1 of 2 August 2019 TABLE C-2 ESTIMATION OF AVERAGE RIVER WIDTH Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Cross section ID*Model point ID**Easting (ft NAD83) Northing (ft NAD83) River Depth (ft NAVD88) Distance (ft) Cross Section Width (m) 1331 2,055,879 386,154 41.88 0 1332 2,055,812 386,120 21.60 66 1333 2,055,753 386,090 -1.40 126 1334 2,055,647 386,037 -1.40 232 1335 2,055,588 386,007 21.60 291 1336 2,055,566 385,996 32.19 312 1565 2,058,901 380,593 36.02 0 1566 2,058,830 380,549 22.16 71 1567 2,058,774 380,515 -0.84 127 1568 2,058,675 380,453 -0.84 225 1569 2,058,619 380,418 22.16 281 1570 2,058,518 380,356 44.33 382 1406 2,056,453 383,857 38.32 0 1407 2,056,356 383,798 22.26 97 1408 2,056,301 383,763 -0.74 152 1409 2,056,202 383,702 -0.74 251 1410 2,056,146 383,667 22.26 307 1411 2,056,113 383,647 32.30 340 1717 2,060,560 377,186 40.59 0 1718 2,060,482 377,157 21.78 78 1719 2,060,421 377,134 -1.22 140 1720 2,060,312 377,094 -1.22 249 1721 2,060,250 377,071 21.78 310 1722 2,060,232 377,065 37.79 328 1644 2,059,549 379,003 30.99 0 1645 2,059,534 378,996 21.71 15 1646 2,059,474 378,970 -1.29 75 1647 2,059,368 378,923 -1.29 181 1648 2,059,308 378,896 21.71 241 1649 2,059,275 378,881 36.48 274 2042 2,061,270 371,304 30.59 0 2043 2,061,246 371,290 20.10 24 2044 2,061,179 371,252 -2.90 91 2045 2,061,092 371,203 -2.90 178 2046 2,061,042 371,174 20.10 228 2047 2,060,966 371,131 42.37 305 1825 2,060,295 374,663 23.04 0 1826 2,060,270 374,661 20.21 24 1827 2,060,201 374,658 -2.79 93 1828 2,060,079 374,653 -2.79 215 1829 2,060,010 374,650 20.21 284 1830 2,059,995 374,649 35.89 300 1931 2,060,424 373,459 40.67 0 1932 2,060,378 373,442 23.21 47 1933 2,060,372 373,439 20.40 52 1934 2,060,311 373,416 -2.60 114 1935 2,060,202 373,376 -2.60 223 1936 2,060,140 373,353 20.40 284 1937 2,060,097 373,336 31.19 328 99 94 97 Notes: *Cross sections locations are shown in Figure C-1. **Model point ID: are locations with northing, easting, and river depths provided in the HEC-RAS model. ***Excluded from average, median and geomean river cross section width calculation due to model points not clearly visible. 1. Data provided from: "A Report of Flood Hazards in Bladen County, North Carolina and Incorporated Areas." RiverADJ. HEC-RAS 5.0.7. (2007) Flood Insurance Study, Federal Emergency Management Agency. North Carolina Flood Risk Information System Engineering Model. Cape Fear RiverADJ. HEC-RAS 5.0.7. 2. The horizontal datum is North American Datum 1983 projected into North Carolina East State Plane (3200). 3. The vertical datum is North American Datum 1988 projected into North Carolina East State Plane (3200). 4. Abbreviations ft: feet m: meter ***Geomean River Cross Section Width (m)= ***Average River Cross Section Width (m)= ***Median River Cross Section Width (m)= 591595 590322 602061 594185 596259 587968 604474 597968 100 116 104 100 84 93 91 95 Page 2 of 2 August 2019 TABLE C-3 CALCULATION OF HFPO-DA DEPOSITED MASS AND MASS FLUX Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Section Depositon Rate at Section Start (µg/m2/yr) Depositon Rate at Section End (µg/m2/yr) Start Deposition Rate** (ng/m2/hr) End Deposition Rate** (ng/m2/hr) Combined Deposition Rate (ng/m2/hr) Average River Width (m) Section Area (m2) Estimated River Velocity*** (ft/s) Estimated River Velocity (m/hr) Estimated Travel Time (hr) Calculated Mass Deposited (ng) Calculated Mass Loading (ng/s) Center 160 160 18 18 18 99 89,028 0.2 219 4.1 6,694,345 452 Up River 160 80 18 9 14 99 48,300 0.2 219 2.2 1,477,776 184 Up River 80 40 9 5 7 99 89,570 0.2 219 4.1 2,541,053 170 Down River 160 80 18 9 14 99 57,813 0.2 219 2.7 2,117,225 220 Down River 80 40 9 5 7 99 55,672 0.2 219 2.6 981,677 106 Total 1,132 Notes: *River cross sections are shown in Figures C-2 through C-6 **Based on model deposition rate, Table C-1, Appendix C ***River velocity is calculated from data from May 2019, Table B-2, Appendix B 1. Abbreviations HFPO-DA: Hexafluoropropylene oxide dimer acid; or dimer acid µg/m2/yr: micrograms per meter square per year ng/m2/hr: nanograms per meter square per hour m: meter m2: meter square ft/s: feet per second hr: hours ng/s: nanograms per second Page 1 of 1 August 2019 Appendix C – Direct Aerial Deposition 1 August 2019 APPENDIX C FIGURES 591595 616535 619506 602061604474 608468 587968614517 590322600052596259 594185597968610240606667612082 613542 614224 Cape Fear River Cross Sections Locations Chemours Fayetteville Works, North Carolina Figure C-1 Notes:1. Cape Fear River cross section locations obtained from "A Report of Flood Hazards in Bladen County, North Carolina and Incorporated Areas." (2007) Flood Insurance Study, Federal Emergency Management Agency. North Carolina Flood Risk Information System Engineering Model. Cape Fear RiverADJ. HEC-RAS 5.0.7.2. Cross sections used for calculation of average river widths for calculation of aerial mass loading.Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Cross Section Length (m): 903.00 Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,AeroGRID, IGN, and the GIS User Community Measurement of Cape Fear River Length at Center Section Chemours Fayetteville Works, North Carolina Figure C-2 Notes:HFPO-DA - Hexafluoropropylene oxide dimer acid; or dimer acid; or GenX µg / m2/yr - micrograms per square meter per year HFPO-DA deposition model contours for October 2018 from ERM, 2018, Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Site Boundary Modeled Deposition Contours,October 2018 Scenario 40 µg/m2/yr 80 µg/m2/yr 160 µg/m2/yr 320 µg/m2/yr 640 µg/m2/yr Length (m): 489.90 Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,AeroGRID, IGN, and the GIS User Community Measurement of Cape Fear River Length at Up-River Section 1 Chemours Fayetteville Works, North Carolina Figure C-3 Notes:HFPO-DA - Hexafluoropropylene oxide dimer acid; or dimer acid; or GenX µg /m2/yr - micrograms per square meter per year HFPO-DA deposition model contours for October 2018 from ERM, 2018, Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Site Boundary Modeled Deposition Contours, October 2018 Scenario 40 µg/m2/yr 80 µg/m2/yr 160 µg/m2/yr 320 µg/m2/yr 640 µg/m2/yr Length (m): 908.05 Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,AeroGRID, IGN, and the GIS User Community Measurement of Cape Fear River Length at Up-River Section 2 Chemours Fayetteville Works, North Carolina Figure C-4 Notes:HFPO-DA - Hexafluoropropylene oxide dimer acid; or dimer acid; or GenX µg / m2/yr - micrograms per square meter per year HFPO-DA deposition model contours for October 2018 from ERM, 2018, Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Site Boundary Modeled Deposition Contours, October 2018 Scenario 40 µg/m2/yr 80 µg/m2/yr 160 µg/m2/yr 320 µg/m2/yr 640 µg/m2/yr Length (m): 586.39 Measurement of Cape Fear River Length at Down-River Section 1 Chemours Fayetteville Works, North Carolina Figure C-5 Notes:HFPO-DA - Hexafluoropropylene oxide dimer acid; or dimer acid; or GenX µg /m2/yr - micrograms per square meter per year HFPO-DA deposition model contours for October 2018 from ERM, 2018, Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Site Boundary Modeled Deposition Contours, October 2018 Scenario 40 µg/m2/yr 80 µg/m2/yr 160 µg/m2/yr 320 µg/m2/yr 640 µg/m2/yr Length (m): 564.68 Measurement of Cape Fear River Length at Down-River Section 2 Chemours Fayetteville Works, North Carolina Figure C-6 Notes:HFPO-DA - Hexafluoropropylene oxide dimer acid; or dimer acid; or GenX µg /m2/yr - micrograms per square meter per year HFPO-DA deposition model contours for October 2018 from ERM, 2018, Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018. Raleigh, NC 1 0 10.5 Miles ³ August 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US Legend Site Boundary Modeled Deposition Contours, October 2018 Scenario 40 µg/m2/yr 80 µg/m2/yr 160 µg/m2/yr 320 µg/m2/yr 640 µg/m2/yr Appendix D – Onsite Groundwater Flow 1 August 2019 APPENDIX D SUPPORTING CALCULATIONS - ONSITE GROUNDWATER FLOW ESTIMATE Appendix D – Onsite Groundwater Flow 2 August 2019 INTRODUCTION AND OBJECTIVE Based on the current understanding of the conceptual site model, the Black Creek Aquifer is the primary hydrogeologic unit that is potentially in hydraulic connection with the Cape Fear River. The Cape Fear River stage appears to typically be lower than the top of the Black Creek Aquifer, except during peak rainfall or flooding, indicating that the Cape Fear River is a discharge boundary for the aquifer. Onsite groundwater from the Black Creek Aquifer discharging to the Cape Fear River is therefore a potential pathway for per- and polyfluoroalkyl substances (PFAS) mass loading to the Cape Fear River. This pathway was identified as Transport Pathway Number 6 in the PFAS mass loading design (Section 4) of the Chemours Fayetteville Works Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes (Geosyntec, 2019). The objective of the supporting calculations presented in this appendix is to estimate PFAS mass loading from onsite groundwater discharge through a forward assessment based on Darcy’s Law using available hydrogeological data as described below. APPROACH The PFAS mass loading from onsite groundwater discharge was estimated using groundwater concentration data from the five LTW wells located along the Cape Fear River bank and estimated volumetric groundwater discharge. Groundwater samples from the five LTW wells were collected in July-November 2018, as part of the Post Hurricane Florence PFAS Characterization Report (Geosyntec, 2019) and for other sampling programs implemented since June 2017. PFAS analytical results for these groundwater samples are presented in Appendix A. Volumetric groundwater discharge was estimated using Darcy’s Law: 𝑄𝑄=𝐾𝐾𝐾𝐾𝐾𝐾 where Q, the volumetric discharge [L3T-1], is the groundwater discharge being estimated; K, the hydraulic conductivity of the aquifer [LT-1]; i, the hydraulic gradient [LL-1]; and, A, the cross-sectional area of discharge from the Black Creek Aquifer into the Cape Fear River [L2]. The hydraulic gradient is calculated as: 𝐾𝐾= (𝐿𝐿𝐿𝐿𝐿𝐿 𝐿𝐿𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊 𝐿𝐿𝑊𝑊𝐿𝐿𝑊𝑊𝐿𝐿 𝐸𝐸𝐿𝐿𝑊𝑊𝐿𝐿𝑊𝑊𝑊𝑊𝐾𝐾𝐸𝐸𝐸𝐸−𝐶𝐶𝑊𝑊𝐶𝐶𝑊𝑊 𝐹𝐹𝑊𝑊𝑊𝑊𝑊𝑊 𝑅𝑅𝐾𝐾𝐿𝐿𝑊𝑊𝑊𝑊 𝑆𝑆𝑊𝑊𝑊𝑊𝑆𝑆𝑊𝑊 𝐸𝐸𝐿𝐿𝑊𝑊𝐿𝐿𝑊𝑊𝑊𝑊𝐾𝐾𝐸𝐸𝐸𝐸)𝐸𝐸𝐸𝐸𝑊𝑊𝐾𝐾𝐸𝐸𝑊𝑊𝑊𝑊𝑊𝑊𝐸𝐸 𝐸𝐸𝐾𝐾𝐸𝐸𝑊𝑊𝑊𝑊𝐸𝐸𝑑𝑑𝑊𝑊 𝑓𝑓𝑊𝑊𝐸𝐸𝐸𝐸 𝐿𝐿𝐿𝐿𝐿𝐿 𝑤𝑤𝑊𝑊𝐿𝐿𝐿𝐿 𝑊𝑊𝐸𝐸 𝑊𝑊𝐾𝐾𝐿𝐿𝑊𝑊𝑊𝑊 Available LTW water level elevations measured in April 2014, September 2015 and June 2019 along with corresponding Cape Fear River stage elevations measured at the USGS flow gauging station located at the W.O. Huske Dam, ID (USGS# 02105500; USGS, 2019), approximately 0.5 river miles downstream of the Site (Appendix B) were used to compute hydraulic gradients (Table D-1). Summary statistics for calculated gradients from all five LTW wells indicate gradients vary between 0.045 to 0.083 feet/feet (Table D-1). This range in computed gradients from all LTW Appendix D – Onsite Groundwater Flow 3 August 2019 wells were compared with computed gradients at LTW-05 for the entire year of 2018 to account for any seasonal variations (Figure D-1). This comparison shows that calculated gradients from all five LTW wells used in this calculation is a conservative measure. Summary statistics for calculated gradients from all five LTW wells were used in computing minimum, 1st quartile, median, 3rd quartile and maximum volumetric groundwater discharge. The hydraulic conductivity of the Black Creek aquifer is selected from literature values based on the observed soil lithologies described for the LTW wells (Table D-2; Freeze and Cherry, 1979). Cross-sectional discharge area along the Cape Fear River is discretized into four layers based on representative lithologic materials encountered: (1) Upper Black Creek Aquifer consists of fine grained material including silts, clays and silty sands; (2) Black Creek Confining Unit consists of lignitic, fat clay; (3) Lower Black Creek Aquifer consists of medium to coarse-grained sands; and (4) Upper Cape Fear Confining Unit consists of hard, fat clay. Unit thicknesses for the four layers are estimated from LTW well lithology and shown in Table D-2. Estimated representative discharge areas in contact with the Cape Fear River is estimated based on an assumed discharge length of 5,000 feet between Willis Creek and W.O. Huske Dam along the river and the approximate thickness of the Black Creek Aquifer in that area (Table D-2). The calculated discharge area was varied as part of model calibration. As a refinement to the model, an assessment of Cape Fear River bottom sediment temperatures adjacent to the Site is ongoing to identify potential zones of increased groundwater upwelling. Minimum, 1st quartile, median, 3rd quartile and maximum volumetric groundwater discharge calculated using Darcy’s Law are presented in Table D-3. Appendix D – Onsite Groundwater Flow 4 August 2019 REFERENCES Freeze, R. A. and J. A. Cherry. 1979. Groundwater, Prentice Hall, Englewood Cliffs, N.J. Geosyntec, 2019. Post Hurricane Florence PFAS Characterization. April 2019. USGS, 2019. National Water Information System: Web Interface. Accessed March 2019. https://waterdata.usgs.gov/nwis/uv?site_no=02105500 Appendix D – Onsite Groundwater Flow 1 August 2019 APPENDIX D TABLES TABLE D-1 ONSITE GROUNDWATER HYDRAULIC GRADIENTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Location Date and Time W.O. Huske Gage Height1 (ft NGVD 29) W.O. Huske Gage Height2 (ft) W.O. Huske Water Level (ft NGVD 29) W.O. Huske Water Level (ft NAVD 88) Measured Top of Casing Elevation (ft NAVD 88) Measured Depth to Water (ft btoc) Calculated Water Level (ft NAVD 88) Estimated Distance to River (ft) Calculated Delta Head (ft) Calculated Hydraulic Gradient3 (ft/ft) Calculated Hydraulic Gradient3 (m/m) LTW-01 4/3/2014 18:30 28.97 3.71 32.68 33.59 53.83 15.39 38.44 85 4.854 0.0571 0.0571 LTW-02 4/3/2014 17:20 28.97 3.75 32.72 33.63 52.48 9.53 42.95 130 9.324 0.0717 0.0717 LTW-03 4/3/2014 15:40 28.97 3.74 32.71 33.62 52.91 10.69 42.22 110 8.604 0.0782 0.0782 LTW-04 4/3/2014 9:47 28.97 3.85 32.82 33.73 51.86 7.89 43.97 170 10.244 0.0603 0.0603 LTW-05 4/3/2014 11:07 28.97 3.83 32.80 33.71 52.01 10.76 41.25 145 7.544 0.0520 0.0520 LTW-01 9/16/2015 9:13 28.97 1.23 30.20 31.11 53.83 18.02 35.81 85 4.704 0.0553 0.0553 LTW-02 9/16/2015 13:47 28.97 1.23 30.20 31.11 52.48 10.58 41.9 130 10.794 0.0830 0.0830 LTW-03 9/15/2015 15:12 28.97 1.20 30.17 31.08 52.91 14.23 38.68 110 7.604 0.0691 0.0691 LTW-04 9/15/2015 17:45 28.97 1.20 30.17 31.08 51.86 11.85 40.01 170 8.934 0.0526 0.0526 LTW-05 9/16/2015 10:52 28.97 1.22 30.19 31.10 52.01 11.02 40.99 145 9.894 0.0682 0.0682 LTW-01 6/13/2019 15:40 28.97 4.87 33.84 34.75 53.83 15.23 38.6 85 3.854 0.0453 0.0453 LTW-02 6/13/2019 15:41 28.97 4.87 33.84 34.75 52.48 9.78 42.7 130 7.954 0.0612 0.0612 LTW-03 6/13/2019 15:50 28.97 4.87 33.84 34.75 52.91 12.23 40.68 110 5.934 0.0539 0.0539 LTW-04 6/13/2019 14:02 28.97 4.90 33.87 34.78 51.86 8.14 43.72 170 8.944 0.0526 0.0526 LTW-05 6/13/2019 13:57 28.97 4.91 33.88 34.79 52.01 9.18 42.83 145 8.044 0.0555 0.0555 Notes: 1. The datum of the USGS Gaging Station 02105500 at W.O. Huske is 28.97 feet above NGVD29 (USGS, 2019). 2. Daily mean gage heights are obtained from the USGS Gaging Station 02105500 at the W.O. Huske Dam (USGS, 2019). 3. W.O. Huske water level datum converted from feet above NGVD29 to feet above NAVD88 by a datum shift factor of +0.276 obtained from the VERTCON tool at the National Geodetic Survey (https://www.ngs.noaa.gov/TOOLS/Vertcon/vertcon.html). 4. Calculated hydraulic gradient, i (feet/ feet) = (Water level elevation in LTW well - Cape Fear River Stage elevation) / (Estimated distance from LTW well to river) 5. Abbreviations ft - feet ft btoc - feet below top of casing ft NGVD 29 - feet above the National Geodetic Vertical Datum of 1929 ft NAVD 88 - feet above the North American Vertical Datum of 1988 ft/ft - feet per feet m/m - meter per meter Page 1 of 1 August 2019 TABLE D-2 ONSITE GROUNDWATER ESTIMATED DISCHARGE AREA AND HYDRAULIC CONDUCTIVITY Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Geologic Unit Estimated unit thickness (feet) Discharge Area length (feet) Estimated Discharge Area (feet2) Hydraulic Conductivity (m/s) Representative Lithologic Material Upper Black Creek Aquifer 21 - 24 2900 65,250 1.0 x 10-6 Silts, Silty Sand Blac Creek Confining Unit 1 - 3 2900 5,800 1.0 x 10-8 Clay Lower Black Creek Aquifer 10 - 20 2900 43,500 1.5 x 10-4 Medium to coarse-grained Sands Upper Cape Fear Confining Unit > 35 2900 26,100 1.0 x 10-9 Clay Notes: 5. Abbreviations: m/s - meters per second 1. Discharge area length presented is from the calibrated mass loading model, assumed to be 58% of total length. 2. Upper Cape Fear Confining Unit is not fully penetrated at the Site and is assumed to be 10 feet in thickness for discharge area calculations. However, this unit does not discharge significant groundwater due to low hydraulic conductivity values. 3. Unit thickness estimated from available onsite lithology for LTW wells. 4. Hydraulic conductivity values presented in this table are within the range of literature values provided for representative lithologic material. Final hydraulic conductivity values from the calibrated mass loading model are indicated here. Representative literature hydraulic conductivity values based on range presented in Freeze, R. A. and J. A. Cherry. 1979. Groundwater, Prentice Hall, Englewood Cliffs, N.J. Page 1 of 1 August 2019 TABLE D-3 ONSITE GROUNDWATER UPWELLING FLOW RATES Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Geologic Completion Zone Estimated Discharge Area1 (feet2) Estimated Discharge Area1 (m2) Estimated Hydraulic Conductivty2 (m/s) Hydraulic Gradient (m/m) Upwelling Rate (m3/s) Upwelling Rate (L/s) Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Upper Black Creek Aquifer 65,250 6,062 1.00E-06 Black Creek Confining Unit 5,800 539 1.00E-08 Lower Black Creek Aquifer 43,500 4,041 1.50E-04 Upper Cape Fear Confining Unit 26,100 2,425 1.00E-09 Notes: L/s - liter per second m2 - squared meters m/s - meters per second m/m - meter per meter 0.028 Average 0.083 0.051 51 33 0.045 28 0.061 0.037 37 Minimum 1st Quartile Median 3rd Quartile Maximum 0.035 35 0.069 0.042 42 0.057 0.053 0.033 1. The estimated discharge area is calculated based on geologic unit thickess provided in Table D-2 and a model-calibrated discharge length of 2600 feet along the Cape Fear River. 2. Hydraulic conductivity values presented in this table are within the range of literature values provided for representative lithologic material. Final hydraulic conductivity values from the calibrated mass loading model are indicated here. Representative literature hydraulic conductivity values based on range presented in Freeze, R. A. and J. A. Cherry. 1979. Groundwater, Prentice Hall, Englewood Cliffs, N.J. Geometric Mean 0.060 0.037 37 Page 1 of 1 August 2019 Appendix D – Onsite Groundwater Flow 1 August 2019 APPENDIX D FIGURES Notes: C:\Users\rwarrier\Desktop\Appendices - Relabel\Appendix C - new D\[Appendix C.xlsx]Figure C-2Computed Hydraulic Gradient between LTW-05 and Cape Fear River Chemours Fayetteville Works, North Carolina Figure D-1 Raleigh, NC August 2019 1. Hydraulic gradients between LTW-05 and Cape Fear River calculated as: i = ((LTW Water Level Elevation) - (Cape Fear River Stage Elevation)) / (Estimated distance from LTW well to river). 2. Cape Fear River stage elevations measured at the USGS flow gauging station located at the W.O. Huske Dam, ID (USGS# 02105500; USGS, 2019), approximately 0.5 river miles downstream of the Site. 3. Estimated distance from LTW-05 to Cape Fear River is 145 feet. -0.02 0.00 0.02 0.04 0.06 0.08 0.10 Jan-18 Jan-18 Mar-18 Apr-18 May-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19Computed Hydraulic Gradient (feet/feet)Hurricane Florence Appendix E – Offsite Groundwater Flow 1 August 2019 APPENDIX E SUPPORTING CALCULATIONS - OFFSITE GROUNDWATER MASS LOADING ESTIMATE Appendix E – Offsite Groundwater Flow 2 August 2019 INTRODUCTION AND OBJECTIVE Sampling of residential offsite groundwater wells indicate that aerial deposition has potentially contributed to the detection of PFAS compounds in the groundwater outside the Site property boundary. Offsite groundwater upwelling to the Cape Fear River is therefore a potential pathway for per- and polyfluoroalkyl substances (PFAS) mass loading to the Cape Fear River. This pathway was identified as Transport Pathway Number 8 in the PFAS mass loading design (Section 4) of the Chemours Fayetteville Works Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes (Geosyntec, 2019). The objective of the supporting calculations presented in this appendix is to estimate PFAS mass loading from offsite groundwater discharge through a forward assessment based on Darcy’s Law using available hydrogeological data as described below. APPROACH The discharge and PFAS concentrations in offsite groundwater used to estimate the PFAS mass loading from offsite groundwater (Transport Pathway 8) were limited by data availability and therefore required the assumptions described below. Volumetric groundwater discharge upwelling to the Cape Fear River is estimated using Darcy’s Law similar to the estimation of onsite groundwater flow (Appendix D): 𝑄𝑄=𝐾𝐾𝐾𝐾𝐾𝐾 where Q, the volumetric discharge [L3T-1], is the groundwater discharge being estimated; K, the hydraulic conductivity of the aquifer [LT-1], assumed to be 2.5 x 10-4 m/s, derived from onsite pump tests in the Surficial Aquifer (Parsons, 2018b); i, the hydraulic gradient [LL-1]; an estimated value that is calculated based on the onsite groundwater hydraulic gradient (refer to Appendix D) and an adjustment factor that is based on topographic variations which is assumed to be reflective of gradient variations in an unconfined aquifer system. This gradient adjustment factor is computed from slope differences using LiDAR digital elevation models in ArcGIS (refer to Figure E-1); and, A, the cross-sectional area of groundwater discharge into the Cape Fear River [L2], estimated based on measurements presented in Appendix C and the approximate thickness of the aquifer estimated from onsite information. Minimum, 1st quartile, median, 3rd quartile and maximum volumetric groundwater discharge was calculated using Darcy’s Law as presented in Table E-1. PFAS concentrations were estimated from spatial monitoring well clusters; offsite groundwater wells were grouped together by observed HFPO-DA concentrations from the Offsite Residential Well program (Table E-2, Figure E-2). The offsite groundwater wells were grouped in to the following clusters: A. 3 to 5 miles from the Site on the east side of the Cape Fear River; Appendix E – Offsite Groundwater Flow 3 August 2019 B. 5 to 6 miles away from the Site on the east side of the Cape Fear River; C. 1 to 3 miles from the Site on the east side of the Cape Fear River; D. 3 to 4 miles from the Site on the west side of the Cape Fear River; and E. 1 to 3 miles from the Site on the west side of the Cape Fear River. Statistics were performed on the concentration clusters to analyze the correlation of HFPO-DA concentration with both (1) distance from the Site and (2) the side of the river where the sampling location is situated. These concentrations were used to develop minimum, 1st quartile, median, 3rd quartile and maximum HFPO-DA concentrations for input into the Mass Loading Model (Table E-1). Data from six locations in the Granular Activated Carbon Pilot Well testing program (Chemours, 2019) were used to build a relationship between HFPO-DA and other PFAS compounds. The average ratios of the measured HFPO-DA to other compounds across the six locations were used to estimate concentrations of other PFAS compounds (Table E-3). Appendix E – Offsite Groundwater Flow 4 August 2019 REFERENCES Chemours, 2019. Residential Well Carbon Pilot Testing Data. Available at: https://www.chemours.com/Fayetteville-Works/en-us/c3-dimer-acid/compliance-testing/ Geosyntec, 2019. Chemours Fayetteville Works Cape Fear River PFAS Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes. August 2019. Appendix E – Offsite Groundwater Flow 1 August 2019 APPENDIX E TABLES TABLE E-1 OFFSITE GROUNDWATER FLOW ESTIMATE Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Statistics Area Section River Length1 (m)River Depth2 (m) Proportion of Upwelling in the River Bottom3 Upwelling Area (m2) On-Site Hydraulic Gradient4 (m/m) Gradient Adjustment Factor5 Adjusted Upwelling Hydraulic Gradient (m/m) Hydraulic Conductivity (m/s) Upwelling Rate (m3/s) HFPO-DA Concentrations6 (ng/L) Mass Loading (ng/s) Mass Loading (ng/s) A East, Adjacent Site 3,303 14 19,068 0.045 0.48 0.022 0.105 1.8 188 B East, Downstream 2,048 14 11,825 0.045 0.48 0.022 0.065 1.8 118 C East, Downstream 5,206 14 30,056 0.045 0.48 0.022 0.165 4.0 661 D West, Downstream 1,757 14 10,146 0.045 0.48 0.022 0.056 10 558 E West, Downstream 2,591 14 14,957 0.045 0.48 0.022 0.082 10 822 A East, Adjacent Site 3,303 14 22,888 0.045 0.48 0.022 0.126 8.0 1,002 B East, Downstream 2,048 14 14,194 0.045 0.48 0.022 0.078 1.8 142 C East, Downstream 5,206 14 36,076 0.045 0.48 0.022 0.198 11 2,081 D West, Downstream 1,757 14 12,179 0.045 0.48 0.022 0.067 10 669 E West, Downstream 2,591 14 17,954 0.045 0.48 0.022 0.099 10 987 A East, Adjacent Site 3,303 14 29,194 0.045 0.48 0.022 0.160 10 1,604 B East, Downstream 2,048 14 18,105 0.045 0.48 0.022 0.099 1.8 181 C East, Downstream 5,206 14 46,017 0.045 0.48 0.022 0.253 56 14,160 D West, Downstream 1,757 14 15,535 0.045 0.48 0.022 0.085 14 1,195 E West, Downstream 2,591 14 22,901 0.045 0.48 0.022 0.126 10 1,258 A East, Adjacent Site 3,303 16 38,780 0.045 0.48 0.022 0.213 17 3,516 B East, Downstream 2,048 16 24,049 0.045 0.48 0.022 0.132 1.8 241 C East, Downstream 5,206 16 61,126 0.045 0.48 0.022 0.336 136 45,679 D West, Downstream 1,757 16 20,635 0.045 0.48 0.022 0.113 21 2,324 E West, Downstream 2,591 16 30,420 0.045 0.48 0.022 0.167 175 29,252AEast, Adjacent Site 3,303 16 41,275 0.045 0.48 0.022 0.227 50 11,340 B East, Downstream 2,048 16 25,597 0.045 0.48 0.022 0.141 1.8 256 C East, Downstream 5,206 16 65,058 0.045 0.48 0.022 0.357 940 336,037 D West, Downstream 1,757 16 21,963 0.045 0.48 0.022 0.121 78 9,413 E West, Downstream 2,591 16 32,377 0.045 0.48 0.022 0.178 420 74,720 A East, Adjacent Site 3,303 16 31,788 0.045 0.48 0.022 0.175 15 2,632BEast, Downstream 2,048 16 19,713 0.045 0.48 0.022 0.108 1.8 197CEast, Downstream 5,206 16 50,104 0.045 0.48 0.022 0.275 158 43,525 D West, Downstream 1,757 16 16,915 0.045 0.48 0.022 0.093 23 2,164 E West, Downstream 2,591 16 24,935 0.045 0.48 0.022 0.137 115 15,817 A East, Adjacent Site 3,303 16 30,689 0.045 0.48 0.022 0.169 9.3 1,566BEast, Downstream 2,048 16 19,032 0.045 0.48 0.022 0.105 1.8 190CEast, Downstream 5,206 16 48,372 0.045 0.48 0.022 0.266 51 13,639DWest, Downstream 1,757 16 16,330 0.045 0.48 0.022 0.090 17 1,547 E West, Downstream 2,591 16 24,073 0.045 0.48 0.022 0.132 35 4,635 Notes: 1. River lengths are estimated based on the aerial deposition calculations in Appendix C. 2. River depths are measured in the onsite groundwater flow calculations in Appendix D. 3. The proportion of groundwater upwelling in the river bottom are estimated by taking the ratio of the Black Creek Aquifer discharge area to the total onsite groundwater discharge area, which can be found in Appendix D. 4. Onsite groundwater hydraulic gradients are calculated in Appendix D. 5. Gradient adjustments were calculated using a 20 ft LiDAR DEM to generate a slope map which was divided into different zones (Figures E-1 and E-2). 6. HFPO-DA concentrations statistics are listed in Table E-2. HFPO-DA: Hexafluoropropylene oxide dimer acid; or dimer acid L/s - liter per second m - meter m2 - squared meter m/m - meter per meter m/s - meter per second m3/s - cubic meter per second ng/L - nanogram per liter ng/s - nanogram per second 64335.5 21576.8 2345.8 4880.8 18398.6 81012.0 431766.8 2.55E-04 2.55E-04 2.55E-04 2.55E-04 2.55E-04 63% 76% 80% 62% 60% Median 3rd Quartile Maximum Average Geometric Mean Minimum 1st Quartile 41% 49% 2.55E-04 2.55E-04 Page 1 of 1 August 2019 TABLE E-2 OFFSITE RESIDENTIAL WELL HFPO-DA CONCENTRATIONS Chemours Fayetteville Works, North Carolina Geosyntec Consultants NC P.C. Area Location Sample Date HFPO-DA Concentration (ng/L) Number of Locations With Detects Minimum Concentration (ng/L) 1st Quartile Concentration (ng/L) Median Concentration (ng/L) 3rd Quartile Concentration (ng/L) Maximum Concentration (ng/L) Average Concentration (ng/L) Geometric Mean Concentration (ng/L) Private Well 14-Dec-17 21 Private Well 12-Dec-17 <10 Private Well 13-Dec-17 38 Private Well 24-Jan-18 50 Private Well 24-Jan-18 15 Private Well 24-Jan-18 <10 Private Well 25-Apr-18 1.79 Private Well 25-Apr-18 1.79 Private Well 25-Apr-18 1.79 Private Well 9-Jan-18 <10 Private Well 11-Apr-18 36.9 Private Well 11-Dec-17 <10 Private Well 15-Jan-18 <10 Private Well 30-Nov-17 13 Private Well 30-Nov-17 <10 Private Well 11-Apr-18 1.86 B Private Well 11-Apr-18 1.82 1 1.8 1.8 1.8 1.8 1.8 1.8 1.8 Private Well 18-Oct-17 49 Private Well 15-Dec-17 <10 Private Well 31-Jan-18 527 Private Well 30-Nov-17 20 Private Well 29-Nov-17 <4 Private Well 30-Apr-19 240 Private Well 14-Aug-18 <10 Private Well 9-May-18 36 Private Well 4-Jan-18 <10 Private Well 12-Dec-17 76 Private Well 18-Mar-19 940 Private Well 6-Aug-18 780 Private Well 22-Sep-17 250 Private Well 14-Dec-17 78 Private Well 5-Jan-18 12 Private Well 5-Jan-18 <10 Private Well 5-Dec-17 24 Private Well 6-Dec-17 63 Private Well 5-Dec-17 94 Private Well 5-Dec-17 150 Private Well 7-Dec-17 <10 Private Well 6-Dec-17 85 Private Well 1-Feb-18 18 Private Well 1-Mar-18 <10 Private Well 7-Feb-18 <10 Private Well 15-Dec-17 23 Private Well 8-Feb-18 <10 Private Well 8-Feb-18 14 Private Well 14-Dec-17 78 Private Well 13-Nov-17 <10 Private Well 6-Dec-17 <10 Private Well 7-Dec-17 420 Private Well 7-Dec-17 <10 Private Well 7-Dec-17 <10 Private Well 27-Jul-18 120 Private Well 27-Jul-18 22 Private Well 20-Oct-17 360 Private Well 16-Oct-17 <10 Private Well 9-Apr-19 400 Private Well 20-Oct-17 <10 Private Well 23-Oct-17 <10 Private Well 23-Oct-17 95 Private Well 23-Oct-17 <10 Private Well 23-Oct-17 <10 Private Well 6-Nov-17 340 Notes: HFPO-DA: Hexafluoropropylene oxide dimer acid; or dimer acid ng/L - nanograms per liter < - not detected 10 175 115 35 78 23 17 420 136 940 158 51 4 1.8 10 14 21 16 1.8 11 56 10 17 50 15 9.3101.8 8.0 E D A C 7 1.8 10 Page 1 of 1 August 2019 TABLE E-3 RATIO OF OTHER PFAS COMPOUNDS TO HFPO-DA Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. HFPO-DA Hexafluoropropylene oxide dimer acid 13252-13-6 1.00 PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 0.67 PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 NA PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 0.49 PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 1.44 PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 0.11 PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 0.11 PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 2.22 Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 NA EVE Acid Perfluoroethoxypropionic acid 69087-46-3 NA PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 NA R-EVE R-EVE EVS1428 NA PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 0.22 Byproduct 4 Byproduct 4 EVS1429 NA Byproduct 5 Byproduct 5 EVS1430 NA Byproduct 6 Byproduct 6 EVS1431 NA NVHOS Perfluoroethoxysulfonic acid 1132933-86-8 NA PES Perfluoroethoxyethanesulfonic acid 113507-82-7 NA PFESA-BP1 Byproduct 1 29311-67-9 NA PFESA-BP2 Byproduct 2 749836-20-2 NA PFBA Perfluorobutanoic acid 375-22-4 0.03 PFDA Perfluorodecanoic acid 335-76-2 NA PFDoA Perfluorododecanoic acid 307-55-1 NA PFHpA Perfluoroheptanoic acid 375-85-9 NA PFNA Perfluorononanoic acid 375-95-1 NA PFOA Perfluorooctanoic acid 335-67-1 0.01 PFHxA Perfluorohexanoic acid 307-24-4 0.01 PFPeA Perfluoropentanoic acid 2706-90-3 NA PFTeA Perfluorotetradecanoic acid 376-06-7 NA PFTriA Perfluorotridecanoic acid 72629-94-8 NA PFUnA Perfluoroundecanoic acid 2058-94-8 NA PFBS Perfluorobutanesulfonic acid 375-73-5 NA PFDS Perfluorodecanesulfonic acid 335-77-3 NA PFHpS Perfluoroheptanesulfonic acid 375-92-8 NA PFHxS Perfluorohexanesulfonic acid 355-46-4 NA PFNS Perfluorononanesulfonic acid 68259-12-1 NA PFOS Perfluorooctanesulfonic acid 1763-23-1 NA PFPeS Perfluoropentanesulfonic acid 2706-91-4 NA 10:2 FTS 10:2-fluorotelomersulfonic acid 120226-60-0 NA 4:2 FTS 4:2 fluorotelomersulfonic acid 757124-72-4 NA 6:2 FTS 6:2 fluorotelomersulfonic acid 27619-97-2 NA 8:2 FTS 8:2 fluorotelomersulfonic acid 39108-34-4 NA NEtFOSAA NEtFOSAA 2991-50-6 NA NEtPFOSA NEtPFOSA 4151-50-2 NA NEtPFOSAE NEtPFOSAE 1691-99-2 NA NMeFOSAA NMeFOSAA 2355-31-9 NA NMePFOSA NMePFOSA 31506-32-8 NA NMePFOSAE NMePFOSAE 24448-09-7 NA PFDOS Perfluorododecanesulfonic acid 79780-39-5 NA PFHxDA Perfluorohexadecanoic acid 67905-19-5 NA PFODA Perfluorooctadecanoic acid 16517-11-6 NA PFOSA Perfluorooctanesulfonamide 754-91-6 NA F-53B Major F-53B Major 73606-19-6 NA F-53B Minor F-53B Minor 83329-89-9 NA ADONA 4,8-dioxa-3H-perfluorononanoate 958445-44-8 NA NaDONA NaDONA EVS1361 NA DONA DONA 919005-14-4 NA Notes: EPA Method 537 Mod Approximate Concentration Ratio to HFPO-DA 1. Approximate concentration ratios based on measured PFAS concentrations from Locations 30, 48, 71, 75, 77, and 79 of the Carbon Pilot Well Testing Program. The average of the concentration ratios among the six locations were used. For EPA 537 compounds, compounds detected less than 50% of the time in collected samples were classified as being NA. Analytical Method Common Name Chemical Name CASN Table 3+ Lab SOP Page 1 of 1 August 2019 Appendix E – Offsite Groundwater Flow 1 August 2019 APPENDIX E FIGURES So urce s: E sri, H E R E, G armi n , I nt erm ap , i ncre me nt P C orp . , G E B C O , U S G S , F AO , N P S , N R C A N , G e oB as e, IG N , K ad ast e r N L , O rd na nce Su rve y, E sri Jap an , M ET I , E sri C hi na (H o ng K o ng ), (c) O pe nS t ree tM ap c on tri bu t ors, an d t he G IS U se r C o mmu ni ty HFPO-DA Sampling at Offsite Residential Wells Chemours Fayetteville Works, North Carolina Figure E-2Raleigh, NC 2 0 21 Miles ³Path: H:\MXDs\TR0726_ProposedOffSiteLocations_All_Aquifers.mxd Last Revised: 8/19/2019 Author: SLauAugust 2019 Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US N S W E 6 mi 4 mi 2 mi Notes:1. Black lines represent cardinal directions(N, E, S, W) 2. ng/L = nanograms per liter Legend Offsite Private Well HFPO-DA Concentrations (ng/L) Non-detect or 0-10 10-70 70-140 140-1,400 >1,400 Site Boundary D B A C E Appendix F – Summary of Sensitivity Analysis Results 1 August 2019 APPENDIX F SUMMARY OF SENSITIVITY ANALYSIS RESULTS TABLE F-1 SUMMARY OF SENSTIVITY ANALYSIS RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 15 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 10 4 ---- 3 Aerial Deposition on River 7,093 7,093 41,598 41,598 0.1 0.1 0.4 0.3 -0.3 -0.3 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 22 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 10 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 16 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 23 29 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 0 0 0 0 ---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 3 ---- 10,377,814 12,755,093 10,412,319 12,789,599 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 15 0 0 2 Willis Creek 1,056,363 494,506 948,998 444,246 10 4 9 3 0.9 0.4 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 22 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 10 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 16 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 24 30 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 3 ---- 10,377,814 12,755,093 10,270,448 12,704,833 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 15 ---- 2 Willis Creek 1,056,363 494,506 529,138 247,701 10 4 5 2 5 2 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 23 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 10 11 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 17 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 25 30 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 3 ---- 10,377,814 12,755,093 9,850,589 12,508,288 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ Flow Rates for Willis Creek Reduced Willis Creek Flow by 10% Less than 1% variation between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Willis Creek Reduced Willis Creek Flow by 50% 2 - 5 % variation between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Empirical Total Table 3+ Estimated Loading (%) Modeled Total Table 3+ Estimated Loading (%) [Original - Sensitivty] (%)Observations Aerial deposition on River Aerial deposition load varied from 1,132 ng/s to 6,638 ng/s Less than 0.5 % variation between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Sensitivity Scenario Descirption Transport Pathway Number Potential PFAS Transport Pathway Calibrated, Original Total Table3+ Mass Loading Estimate (ng/s) Modeled Sensitivty Total Table 3+ Mass Loading Estimate (ng/s) Page 1 of 5 August 2019 TABLE F-1 SUMMARY OF SENSTIVITY ANALYSIS RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 Empirical Total Table 3+ Estimated Loading (%) Modeled Total Table 3+ Estimated Loading (%) [Original - Sensitivty] (%)ObservationsSensitivity Scenario Descirption Transport Pathway Number Potential PFAS Transport Pathway Calibrated, Original Total Table3+ Mass Loading Estimate (ng/s) Modeled Sensitivty Total Table 3+ Mass Loading Estimate (ng/s) 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 15 ---- 2 Willis Creek 1,056,363 494,506 1,161,803 543,865 10 4 11 4 -0.9 -0.4 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 22 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 10 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 16 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 23 29 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 3 ---- 10,377,814 12,755,093 10,483,254 12,804,452 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 14 ---- 2 Willis Creek 1,056,363 494,506 1,587,414 743,102 10 4 15 6 -4 -2 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 3 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 21 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 10 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 15 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 22 29 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 3 ---- 10,377,814 12,755,093 10,908,865 13,003,690 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 5 17 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 12 4 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 8 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 27 19 ---- 6A Seep A 967,485 1,325,336 446,281 296,430 9 10 5 3 4 8 6B Seep B 1,683,557 1,038,907 772,558 845,720 16 8 9 8 7 1 6C Seep C 215,507 282,525 173,835 173,000 2 2 2 2 0 1 6D Seep D 494,879 467,789 246,705 233,201 5 4 3 2 2 2 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 28 34 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 5 4 ---- 10,377,814 12,755,093 8,655,764 11,188,887 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ Flow Rates for Seeps Reduced Seeps Flow by 50% Less than 8% decrease in overall mass loading between original and sensitivity model. Decrease in mass loading for Seep A between 4% and 8 %, Seep B between 1% and 7 %, Seep C less than 1 %, and Seep D less than 2% Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Willis Creek Increase Willis Creek Flow by 10% Less than 2% variation between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Willis Creek Increase Willis Creek Flow by 50% 2 - 5 % variation between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Page 2 of 5 August 2019 TABLE F-1 SUMMARY OF SENSTIVITY ANALYSIS RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 Empirical Total Table 3+ Estimated Loading (%) Modeled Total Table 3+ Estimated Loading (%) [Original - Sensitivty] (%)ObservationsSensitivity Scenario Descirption Transport Pathway Number Potential PFAS Transport Pathway Calibrated, Original Total Table3+ Mass Loading Estimate (ng/s) Modeled Sensitivty Total Table 3+ Mass Loading Estimate (ng/s) 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 13 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 9 4 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 3 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 20 15 ---- 6A Seep A 967,485 1,325,336 1,338,842 889,290 9 10 11 6 -2 4 6B Seep B 1,683,557 1,038,907 2,317,673 2,537,160 16 8 20 18 -4 -10 6C Seep C 215,507 282,525 521,504 519,000 2 2 4 4 -2 -1 6D Seep D 494,879 467,789 493,410 466,401 5 4 4 3 1 0 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 21 27 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 3 3 ---- 10,377,814 12,755,093 11,687,814 14,052,387 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 5 18 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 12 5 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 9 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 25 21 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 11 13 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 18 10 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 3 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 1,185,765 1,391,765 23 29 13 13 10 16 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 4 4 ---- 10,377,814 12,755,093 9,146,422 10,396,278 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 3 13 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 8 3 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 3 6 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 18 15 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 8 9 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 13 7 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 4 3 ---- 7 Old Outfall 002 2,417,156 3,750,579 4,743,060 5,567,058 23 29 37 38 -14 -9 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 3 3 ---- 10,377,814 12,755,093 12,703,717 14,571,572 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ Flow Rates for Old Outfall 002 Reduced Old Outfall 002 Flow by 50% Estimated loading lower by 10% to 16% between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Old Outfall 002 Increased Old Outfall 002 Flow by 50% Estimated loading increased by 9% to 14% between original and sensitivity model Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Seeps Increase Seeps Flow by 50% Less than 14% increase in overall mass loading between original and sensitivity model. Decrease in mass loading for Seep A between 2% and 4 %, Seep B between 4 and 10 %, Seep C between 1 and 23 %, and Seep D less than 1% Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Page 3 of 5 August 2019 TABLE F-1 SUMMARY OF SENSTIVITY ANALYSIS RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 Empirical Total Table 3+ Estimated Loading (%) Modeled Total Table 3+ Estimated Loading (%) [Original - Sensitivty] (%)ObservationsSensitivity Scenario Descirption Transport Pathway Number Potential PFAS Transport Pathway Calibrated, Original Total Table3+ Mass Loading Estimate (ng/s) Modeled Sensitivty Total Table 3+ Mass Loading Estimate (ng/s) 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 3 11 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 7 3 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 3 6 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 16 13 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 7 8 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 12 6 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 3 3 ---- 7 Old Outfall 002 2,417,156 3,750,579 6,324,080 7,422,744 23 29 44 45 -21 -16 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4 3 3 2 ---- 10,377,814 12,755,093 14,284,737 16,427,258 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 15 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 10 4 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 23 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 11 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 17 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 24 30 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 196,581 193,863 4 3 2 2 2 2 10,377,814 12,755,093 10,184,061 12,543,120 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ 1 Up-Stream River 429,550 1,868,529 429,550 1,868,529 4 15 4 14 ---- 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10 4 10 4 ---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4 7 4 7 ---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22 17 22 17 ---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9 10 9 10 ---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16 8 16 8 ---- 6C Seep C 215,507 282,525 215,507 282,525 2 2 2 2 ---- 6D Seep D 494,879 467,789 494,879 467,789 5 4 5 4 ---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23 29 23 29 ---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 617,826 609,283 4 3 6 5 -2 -2 10,377,814 12,755,093 10,605,306 12,958,541 100 100 100 100 ---- 9,959,601 13,447,005 9,959,601 13,447,005 ------------ Flow Rates for Georgia Branch Creek Increased Georgia Branch Creek Flow by 50% 50% incease in Georgia Branch Creek flow rate increases estimated loading by 2% Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Old Outfall 002 Increased Old Outfall 002 Flow by 100% Estimated loading between original and sensitivity model increased by 16% to 21% Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Flow Rates for Georgia Branch Creek Decreased Flow by 50% Estimated loading between original and sensitivity model decreased by 2% Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Page 4 of 5 August 2019 TABLE F-1 SUMMARY OF SENSTIVITY ANALYSIS RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC, P.C. May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 May-19 Jun-19 Empirical Total Table 3+ Estimated Loading (%) Modeled Total Table 3+ Estimated Loading (%) [Original - Sensitivty] (%)ObservationsSensitivity Scenario Descirption Transport Pathway Number Potential PFAS Transport Pathway Calibrated, Original Total Table3+ Mass Loading Estimate (ng/s) Modeled Sensitivty Total Table 3+ Mass Loading Estimate (ng/s) 9,289,800 11,667,623 -------------7 -13 9,959,601 13,447,005 ---------------- 11,529,828 13,906,533 ------------16 3 9,959,601 13,447,005 ---------------- 10,339,952 12,717,236 -------------0.2 -0.2 10,364,058 12,741,341 ---------------- 1 Up-Stream River 429,550 1,868,529 2,610,860 3,130,323 4%15%25%22%-20%-8% 2 Willis Creek 1,056,363 494,506 1,056,363 494,506 10%4%10%4%---- 3 Aerial Deposition on River 7,093 7,093 7,093 7,093 < 2%< 2%< 2%< 2%---- 4 Outfall 002 375,836 918,968 375,836 918,968 4%7%4%7%---- 5 Onsite Groundwater 2,309,468 2,164,439 2,309,468 2,164,439 22%17%22%17%---- 6A Seep A 967,485 1,325,336 967,485 1,325,336 9%10%9%10%---- 6B Seep B 1,683,557 1,038,907 1,683,557 1,038,907 16%8%16%8%---- 6C Seep C 215,507 282,525 215,507 282,525 2%2%2%2%---- 6D Seep D 494,879 467,789 494,879 467,789 5%4%5%4%---- 7 Old Outfall 002 2,417,156 3,750,579 2,417,156 3,750,579 23%29%23%29%---- 8 Offsite Groundwater 30,587 30,587 30,587 30,587 < 2%< 2%< 2%< 2%---- 9 Georgia Branch Creek 390,334 405,836 390,334 405,836 4%3%4%3%---- 10,377,814 12,755,093 10,605,306 14,016,887 ------------ 9,959,601 13,447,005 9,959,601 13,447,005 ------------ Notes: - ng/s: nanograms per second - %: percent 1. For each sensitivity test, one of the above Transport Pathway inputs to the calibrated model is varied and the resulting model estimated Total Table 3+ PFAS mass loading is compared with the original calibrated model Total Table 3+ PFAS mass loading. Upstream Concentrations Changed CFR-RM-76 sample non-detect concentrations from zero to method detection limit Total Estimated Mass Flux and Corresponding River Concentration Measured Concentration and Calculated Mass Loading at Bladen Bluffs Up-stream River Tranpost Pathway increased 8 - 20% when changing non-detect samples from zero to method detection limit. Changed offsite hydraulic conductivity value from 2.5 x 10-4 m/s to 1 x 10-6 m/s Total Estimated Mass Flux and Corresponding River Concentration 2 order of mag increase in offsite K value - less than 0.2% change in mass loadingMeasured Concentration and Calculated Mass Loading at Bladen Bluffs On site groundwater Off site groundwater Discharge length varied from 52% - 41% Total Estimated Mass Flux and Corresponding River Concentration 9% decrease in discharge length < 4% decrease in total mass loadingMeasured Concentration and Calculated Mass Loading at Bladen Bluffs Discharge length varied from 41% - 76% Total Estimated Mass Flux and Corresponding River Concentration 35% increase in discharge length < 16% increase in total mass loadingMeasured Concentration and Calculated Mass Loading at Bladen Bluffs Page 5 of 5 August 2019 ATTACHMENT 2: Seeps and Creeks Investigation Report SEEPS AND CREEKS INVESTIGATION REPORT Prepared for The Chemours Company FC, LLC 22828 NC Highway 87 Fayetteville, NC 28306 Prepared by Geosyntec Consultants of NC, P.C. 2501 Blue Ridge Road, Suite 430 Raleigh, NC 27607 Geosyntec Project Number TR0795 August 26, 2019 Seeps and Creeks Investigation Report ii August 26, 2019 TABLE OF CONTENTS 1. INTRODUCTION ................................................................................................ 1 1.1 Site Setting ................................................................................................... 1 1.2 Objectives .................................................................................................... 4 1.3 Scope of Work ............................................................................................. 5 1.4 Report Organization .................................................................................... 5 2. SCOPE AND METHODS .................................................................................... 7 2.1 Scope of Field Events .................................................................................. 7 2.1.1 February 2019 Event ....................................................................... 7 2.1.2 May 2019 Event .............................................................................. 7 2.1.3 June 2019 Event .............................................................................. 8 2.2 Field Methods .............................................................................................. 9 2.2.1 General Field Procedures ................................................................ 9 2.2.2 Decontamination Methods .............................................................. 9 2.2.3 Sample Shipping, Chain of Custody, and Holding Times .............. 9 2.2.4 Field QA/QC ................................................................................. 10 2.2.5 Creek and Seep Sample Collection Methods ................................ 10 2.2.6 Cape Fear River Water Sample Collection Methods .................... 10 2.2.7 Seep Identification Methods ......................................................... 10 2.2.8 Flow Measurement Methods ......................................................... 11 2.2.9 Documentation .............................................................................. 12 2.3 Laboratory Methods .................................................................................. 12 2.3.1 Analytical Methods ....................................................................... 12 2.3.2 Laboratory QA/QC........................................................................ 13 3. RESULTS AND OBSERVATIONS .................................................................. 14 3.1 Laboratory Analytical Data Quality .......................................................... 14 3.1.1 Data Management and Reporting.................................................. 15 3.1.2 QA/QC Samples ............................................................................ 15 3.2 Results ....................................................................................................... 16 3.2.1 Analytical Laboratory Compound Reporting Limits .................... 17 3.2.2 Flow Gauging Limitations and Assumptions ................................ 18 3.3 Observations .............................................................................................. 18 Seeps and Creeks Investigation Report iii August 26, 2019 3.3.1 February 2019 Event ..................................................................... 19 3.3.2 May 2019 Event ............................................................................ 19 3.3.3 June 2019 Event ............................................................................ 19 3.3.4 Cape Fear River Concentrations ................................................... 20 3.3.5 Flow Observations ........................................................................ 21 4. SUMMARY AND PLANNED FUTURE ACTIONS ....................................... 22 5. REFERENCES ................................................................................................... 24 Seeps and Creeks Investigation Report iv August 26, 2019 LIST OF TABLES Table 1: Location Summary Table 2: PFAS and Associated Analytical Methods Table 3: Total Daily Precipitation – February, May, and June 2019 Table 4: Analytical Results Table 5: Stream Bed Temperature Survey Results Table 6A: Total Table 3+ Concentrations Table 6B: HFPO-DA Concentrations Table 7: Flow Measurement Summary Table 8A: Estimated Flow Rates – Seeps A to D, Georgia Branch Creek, and Willis Creek Table 8B: Estimated Flow Rates – Old Outfall 002 Seeps and Creeks Investigation Report v August 26, 2019 LIST OF FIGURES Figure 1: Site Location and Site Features Figure 2A: Sample and Flow Measurement Locations – February 2019 Event Figure 2B: Sample and Flow Measurement Locations – May 2019 Event Figure 2C: Sample and Flow Measurement Locations – June 2019 Event Figure 3A: Identified Seeps – Seeps A and B Figure 3B: Identified Seeps – Old Outfall 002 and Seeps C and D Figure 4A: Total Table 3+ Concentrations – February 2019 Event Figure 4B: Total Table 3+ Concentrations – May 2019 Event Figure 4C: Total Table 3+ Concentrations – June 2019 Event Figure 5A: HFPO-DA Concentrations – February 2019 Event Figure 5B: HFPO-DA Concentrations – May 2019 Event Figure 5C: HFPO-DA Concentrations – June 2019 Event Figure 6A: Cape Fear River Total Table 3+ Concentrations – February, May, and June 2019 Events Figure 6B: Cape Fear River HFPO-DA Concentrations – February, May, and June 2019 Events Seeps and Creeks Investigation Report vi August 26, 2019 LIST OF APPENDICES Appendix A: Field Photograph Record Appendix B: Field Parameters Appendix C: Infrared Photograph Record Appendix D: Flow Velocity Measurement Summary Appendix E: Salt Dilution Gauging Summary Appendix F: Temporary Weir Installation Summary Appendix G: Laboratory Reports & DVM Report Seeps and Creeks Investigation Report vii August 26, 2019 ACRONYMS AND ABBREVIATIONS COC – Chain of Custody DFSA – Difluoro-sulfo-acetic acid DQO – data quality objectives DVM – Data Verification Module EIM – Environmental Information Management ft bgs – feet below ground surface GPM – gallons per minute HDPE – High Density Polyethylene HFPO-DA – Hexafluoropropylene oxide dimer acid mL – Milliliter MMF – Difluoromalonic acid MS – Matrix spike MSD – Matrix spike duplicate MSL – mean sea level MTP – Perfluoro-2-methoxypropanoic acid NCDEQ – The North Carolina Department of Environmental Quality ng/L – Nanograms per liter NVHOS - Perfluoroethoxysulfonic acid PFAS – Per- and polyfluoroalkyl substances PFO5DA – Perfluoro(3,5,7,9,11-pentaoxadodecanoic) acid PPF Acid – Perfluoropropionic acid QA/QC – Quality assurance/ quality control RPD – Relative percent difference SOP –Standard Operating Procedure µS/cm – microsiemens per centimeter WWTP – wastewater treatment plant Seeps and Creeks Investigation Report August 26, 2019 Seeps and Creeks Investigation Report 1 August 26, 2019 1. INTRODUCTION This report was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The Chemours Company FC, LLC (Chemours) to provide a summary of assessment activities conducted to evaluate flow rates and concentrations of per- and polyfluoroalkyl substances (“PFAS”) in seeps and creeks in the vicinity of the Chemours Fayetteville Works, North Carolina site (the Site, Figure 1). This report was prepared to support the PFAS mass loading evaluation prepared pursuant to Paragraph 12(a) in the executed Consent Order entered February 25, 2019 between Chemours and the North Carolina Department of Environmental Quality (NCDEQ) with the Cape Fear River Watch as intervenor. 1.1 Site Setting The Site is located in the northwestern portion of Bladen County and southern portion of Cumberland County about 20 miles from Fayetteville, NC. Chemours operates two manufacturing areas on the Site, the Chemours Monomers IXM Area and the Polymer Processing Aid Area (PPA Area). Chemours also operates the wastewater treatment plant (WWTP) and Power Area at the Site; filtered water and demineralized water are produced in the Power Area. Two tenants also operate on the Site; Kuraray America Inc. (Kuraray) and E.I. du Pont de Nemours and Company (DuPont). The land surface is relatively flat in the manufacturing areas of the Site and slopes down a bluff with about a 100-foot change in elevation towards the Cape Fear River on the east side of the Site. To the north of the Site, the property slopes towards Willis Creek, which is a tributary that discharges to the Cape Fear River. To the south of the manufacturing area is the Old Outfall Channel, which also discharges to the Cape Fear River. Further south, off the Site, is Georgia Branch Creek which is a tributary to the Cape Fear River. Site Geology As described by Parsons (2018), Bladen County is within the Coastal Plain Physiographic Province, which consists of a seaward thickening wedge of sedimentary deposits ranging in age from Cretaceous to Recent. Paleozoic metamorphic and igneous rocks underlie these deposits. The Site is underlain by the Black Creek Formation, which is characterized by lignitic clay with thin beds and laminae of fine-grained micaceous sand as well as thick lenses of cross-bedded sand. The upper portion of the formation may also contain glauconitic, fossiliferous clayey sand lenses. The Black Creek Formation and surficial deposits are the principal potable water aquifers in the region. Seeps and Creeks Investigation Report 2 August 26, 2019 Based on the lithology logged during previous on-site investigations, the Site is underlain by a fine- to medium-grained sand unit with thin discontinuous interbedded silt/clay lenses. The sand extends to a depth of approximately 65 feet below ground surface (ft bgs) (elevation of +80 feet mean sea level, MSL). The saturated portion of this unit has been identified as the Surficial Aquifer. Beneath this unit is a 7- to 15-foot-thick, laterally- continuous dense clay that has been identified as the Black Creek Confining Unit. The elevation of this unit (approximately +65 to +77 ft MSL) indicates that it, too, should outcrop along the bluff face adjacent to the Cape Fear River, and potentially along the embankment near Willis Creek. Beneath this confining unit is the Black Creek Aquifer, which is approximately 8 to 20 ft thick and is encountered at depth between 80 and 100 ft bgs (elevation of approximately +45 to +65 ft MSL) at the top of the bluff. Beneath this aquifer is a massive dense clay (with minor sand stringers) that has been identified as the Upper Cape Fear Confining Unit. This unit was not fully penetrated at the Site; however, it extended to at least 200 ft bgs (elevation of -55 ft MSL). Beneath the manufacturing area, the uppermost sand unit is locally bisected by an aerially extensive stiff clay lens. This clay lens is limited in lateral extent to the east, north and south by local topography and pinches out (terminates) to the west of the manufacturing area. The depth to the top of the clay lens is approximately 15 to 18 ft bgs. The clay lens becomes thinner moving west across the manufacturing area and ranges from approximately one foot to approximately 19 feet (ft) thick. Site Hydrogeology The hydrogeology of the Site includes a perched water zone and two aquifers; the Perched Zone, the Surficial Aquifer and the Black Creek Aquifer. The Perched Zone is aerially limited and generally is located above the top of a discontinuous clay layer present in the manufacturing area. Based on recent investigations and on-going evaluations, the Perched Zone may have been influenced by seepage of water through the previously unlined sedimentation basins and infiltration of non-contact cooling water from previously unlined drainage ditches. In 2018, the sedimentation basins and cooling water channel were lined. Where perched water is present, it is encountered from between 6 to 20 ft bgs. The lateral extent of the Perched Zone is controlled by topography and the lateral extent of the clay lens. The Surficial and Black Creek Aquifers are mostly separated by the Black Creek confining unit, a clay layer. This clay layer is not fully confining as geological and geochemical data indicate water and PFAS transfer has occurred from the Surficial Seeps and Creeks Investigation Report 3 August 26, 2019 Aquifer to the Black Creek Aquifer. The Black Creek Aquifer is the uppermost identified regional hydrogeologic unit. Flow in the Black Creek Aquifer is toward the Cape Fear River. The Cape Fear River stage is also lower than the base of the Black Creek Aquifer, indicating that the Cape Fear River is also a discharge boundary for the Black Creek Aquifer. Below the Black Creek Aquifer is the Upper Cape Fear Confining Unit. This clay is over 30-ft thick and is an aquitard to potential further downward flow based on limited on Site geological borings and USGS groundwater wells at the Site that demonstrate minimal hydraulic connection between the Black Creek Aquifer and the Upper Cape Fear Aquifer. The Surficial Aquifer is a shallow unconfined aquifer encountered at approximately 50 ft bgs. Groundwater elevations range from approximately 100 to 107 ft above MSL in the western areas of the Site to approximately 93 ft above MSL in the eastern areas of the Site, indicating that groundwater flow is generally toward the Cape Fear River. The Cape Fear River stage is typically near +30 ft MSL, which is lower than the base elevation of the Surficial Aquifer, indicating that the Cape Fear River is a discharge boundary for the Surficial Aquifer. Based on groundwater elevations near Willis Creek, portions of the creek are “gaining” (groundwater discharges to the creek) and portions are “losing” (surface water infiltrates to the underlying groundwater). Georgia Branch Creek also appears to be a gaining stream near where State Road 1303 crosses Highway 87. The focus of this report is to further assess the bluff and evaluate if groundwater is contributing to the seeps. PFAS Originating from the Site PFAS is a term used for a group of man-made carbon-based chemicals composed of a fully or partially fluorinated chain of carbon atoms (referred to as a “tail”) at one end of the carbon chain and a nonfluorinated, polar functional group (referred to as a “head”) at the other end. Recent estimates (Wang et. al., 2017) suggest over 3,000 PFAS are or have been produced across various industries and for various applications. Chemours manufactures per- and polyfluoroalkyl ether compounds and polymers at the Site. The PFAS originating from the Chemours Fayetteville Works Site are characterized primarily by the presence of ether bonds, i.e. two carbons connected by an oxygen atom. To date twenty-four (24) PFAS compounds that are present in Site process water have been identified and had reference standards produced (Geosyntec, 2019a). Of these twenty- four (24) compounds, analytical methods exist for twenty (20), the Table 3+ SOP method, with methods presently being developed for the remaining four (4) compounds [Difluoro- sulfo-acetic acid (DFSA), Difluoromalonic acid (MMF), Perfluoro-2-methoxypropanoic Seeps and Creeks Investigation Report 4 August 26, 2019 acid (MTP) and Perfluoropropionic acid (PPF Acid)]. PFAS from other sources are also present in the Cape Fear River (Geosyntec, 2018). The current grouping of Table 3+ PFAS, including Hexafluoropropylene oxide dimer acid (HFPO-DA) which can also be analyzed by other methods, is used to represent PFAS loads originating from the facility Before modifying operations, PFAS associated with the Site were released through a range of pathways, including: (i) to air via air emissions, (ii) to surface water via Outfall 002, and (iii) to soil and groundwater from piping that has either been replaced or will be replaced as described later in this Reduction Plan. These PFAS releases have resulted in PFAS being detected in environmental media both onsite and offsite. Geosyntec developed a mass loading model (Geosyntec, 2019b) pursuant to Consent Order Paragraph 12 that assesses relative PFAS loading contributions from nine different transport pathways. 1.2 Objectives Paragraph 12(a) of the Consent Order requires that Chemours develop a plan to achieve the maximum reductions in PFAS loading from the Site to the Cape Fear River that are economically and technically feasible within a two-year period. Development of this plan required evaluation of PFAS loadings from the Site that reach the Cape Fear River. While other investigations are evaluating PFAS loadings from Outfall 002 at the Site, it was also necessary to understand potential PFAS loadings from other pathways in the vicinity of the Site. These pathways included Old Outfall 002, creeks upstream and downstream of the site (Willis Creek and Georgia Branch Creek, respectively) and groundwater seeps north, east, and south of the manufacturing area. Several groundwater seeps were observed at and downgradient of the bluff on the eastern side of the Site, and others were observed along the reaches of Old Outfall 002, Willis Creek, and Georgia Branch Creek. Flow from these seeps and creeks may contribute PFAS loading to the Cape Fear River separate from the contribution due to Outfall 002. The Seeps and Creeks Investigation was implemented to evaluate PFAS loading from the Site to the Cape Fear River associated with the seeps and creeks. In order to evaluate mass loading from seeps and creeks, Chemours and its contractors conducted three rounds of sample collection and flow measurements in February, May, and June 2019. The field effort was conducted according to the following workplans: • Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c); • Additional Creeks, Old Outfall 002 and Seeps Investigation Plan (Geosyntec, 2019d); and Seeps and Creeks Investigation Report 5 August 26, 2019 • Willis Creek and Seep D Assessment Plan (Geosyntec, 2019e) The objectives of the Seeps and Creeks Investigation were as follows: • Identify seeps and creeks in the vicinity of the Site that enter the Cape Fear River; • Assess the base volumetric flow rate of seeps and creeks entering the Cape Fear River at and near the Site; • Assess gain in stream flow of the creeks and seeping water flow towards the Cape Fear River; • Assess PFAS concentrations in waters to obtain more information on PFAS mass loading as it pertains to the Cape Fear River during wet and dry conditions; • Assess regions of groundwater upwelling near the stream bed in Willis Creek, Georgia Branch Creek, Old Outfall 002, and the channels with flowing water from seeps. 1.3 Scope of Work The Seeps and Creeks Investigation was conducted during field events in February, May, and June 2019. Activities conducted to support the Seeps and Creeks Investigation were as follows: • Collecting water samples from seeps, creeks, and the Cape Fear River for PFAS during wet and dry conditions; • Gauging seep and creek volumetric flow during wet and dry conditions; • Assessing temperature contrasts near the stream bed to aid in identification of areas of groundwater upwelling; and • Observing stream channels to visually identify areas of groundwater seepage. Further details on scope conducted for each field event are described in Section 2.1 below. 1.4 Report Organization The remainder of this document is organized as follows: Section 2 – Scope and Methods: This section describes the scope of work conducted during each field event and the methods implemented in the field and laboratory; Section 3 – Results and Observations: This section presents the results of the Seeps and Creeks Investigation and discusses the results in the context of the investigation objectives; Seeps and Creeks Investigation Report 6 August 26, 2019 Section 4 – Summary and Planned Future Actions: This section summarizes the findings of the Seeps and Creeks Investigation and describes additional planned efforts related to the seeps and creeks; and Section 5 – References: This section lists the references used in this report. Seeps and Creeks Investigation Report 7 August 26, 2019 2. SCOPE AND METHODS This section describes the methods implemented during the Seeps and Creeks Investigation as well as the scope of work conducted during each field event. A photo log is provided in Appendix A, showing select seep areas and activities. 2.1 Scope of Field Events 2.1.1 February 2019 Event The February 2019 Event was completed by Geosyntec and Parsons of North Carolina Inc. (Parsons) according to the Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c) between February 1 and 7, 2019. Sampling and flow gauging locations are shown on Figure 2A and listed in Table 1. Compounds evaluated as part of this field event are listed in Table 2. Samples for PFAS analysis were collected at thirty- eight locations, and flow rates were measured at fifteen locations. In the three days (72 hours) preceding the start of this field event 0.09 inches of rain was measured in the vicinity of the Site; otherwise there was no measurable precipitation during this event (Table 3). The February 2019 Event was considered a dry weather event for the purposes of the Seeps and Creeks Investigation, since there was a continuous period of 72 hours without rainfall greater than 0.25 inches prior to sample collection. Samples were collected for PFAS analysis from locations in Seep A, Seep B, Seep C, Old Outfall 002, Willis Creek, and the Cape Fear River (Figure 2A). Flow gauging measurements were conducted at locations in Seep A, Seep B, Seep C, Old Outfall 002, and Willis Creek. Flow was measured at these locations using salt dilution gauging and flow velocity gauging. Temperature contrasts between groundwater and surface water were assessed in Old Outfall 002 using a submersible temperature probe and an infrared camera. 2.1.2 May 2019 Event The May 2019 Event was completed by Geosyntec and Parsons according to the Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c) and the Additional Creeks, Old Outfall 002 and Seeps Investigation Plan (Geosyntec, 2019d) between May 20 and 30, 2019. Sampling and flow gauging locations are shown on Figure 2B and listed in Table 1. Compounds evaluated as part of this field event are listed in Table 2. Samples for PFAS analysis were collected at thirty-eight locations, and flow rates were measured at eleven locations. On the first day of this sampling event, approximately 0.24 inches of rain was measured in the vicinity of the Site; otherwise there was no measurable Seeps and Creeks Investigation Report 8 August 26, 2019 precipitation during this event (Table 3). The May 2019 Event was considered a dry weather event for the purposes of the Seeps and Creeks Investigation, since there was a continuous period of 72 hours without rainfall greater than 0.25 inches prior to sample collection. Samples were collected for PFAS analysis from locations in Seep A, Seep B, Seep C, Seep D, Old Outfall 002, Willis Creek, Georgia Branch Creek, the Cape Fear River, the excess river water location, and Outfall 002. Flow gauging measurements were conducted at locations in Seep A, Seep B, Seep C, Seep D, Old Outfall 002, Willis Creek, and Georgia Branch Creek. Flow was measured at these locations using salt dilution gauging, flow velocity gauging, and temporary weir installation. Additional areas were inspected for other channelized seeps that may reach the Cape Fear River so that they could be incorporated into the investigation. 2.1.3 June 2019 Event The June 2019 Event was completed by Geosyntec and Parsons according to the Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c), the Additional Creeks, Old Outfall 002 and Seeps Investigation Plan (Geosyntec, 2019d), and the Willis Creek and Seep D Assessment Plan (Geosyntec, 2019e) on June 7, 2019. Sampling and flow gauging locations are shown on Figure 2C and listed in Table 1. Compounds evaluated as part of this field event are listed in Table 2. Samples for PFAS analysis were collected at seventeen locations, and flow rates were measured at sixteen locations. In the two days (48 hours) preceding the start of the sampling event approximately 0.8 inches of rain was measured in the vicinity of the Site; otherwise there was no measurable precipitation during this event (Table 3). The June 2019 Event was considered a wet weather event for the purposes of the Seeps and Creeks Investigation, since there was greater than 0.25 inches of rain in the 72 hours prior to sample collection. Samples were collected for PFAS analysis from locations in Seep A, Seep B, Seep C, Seep D, Old Outfall 002, Willis Creek, Georgia Branch Creek, the Cape Fear River, the excess river water location, and Outfall 002. Flow gauging measurements were conducted at locations in Seep A, Seep B, Seep C, Seep D, Old Outfall 002, Willis Creek, and Georgia Branch Creek. Flow was measured at these locations using salt dilution gauging, flow velocity gauging, and temporary weir installation. Seeps and Creeks Investigation Report 9 August 26, 2019 2.2 Field Methods 2.2.1 General Field Procedures All equipment was inspected by the field program supervisor and calibrated daily prior to use in the field according to the manufacturer’s recommendations. Samples were collected for PFAS analysis before flow rate assessment. Samples were collected in 250 milliliter (mL) high density polyethylene (HDPE) bottles with a wide-mouth screw-cap. Sample bottles were filled and caps were securely fastened after sample collection. Each sample was labeled with a unique sample identification number, date, time and location of sampling, and the initials of the individual collecting the sample. A field notebook was used to record information regarding additional items such as quality assurance/ quality control (QA/QC), sample identifications, color, odor, turbidity, and other field parameters. Field parameters recorded from the sampling events are provided in Appendix B. 2.2.2 Decontamination Methods Sample containers were new and used only once for each sample. Disposable equipment (e.g., gloves, tubing, etc.) was not reused, therefore; these items did not require decontamination. All non-dedicated or non-disposable sampling equipment was decontaminated immediately before sample collection in the following manner: • De-ionized water rinse; • Scrub with de-ionized water containing non-phosphate detergent (i.e., Alconox®); and • De-ionized water rinse. 2.2.3 Sample Shipping, Chain of Custody, and Holding Times Upon sample collection, each labeled, containerized sample was placed into a heavy plastic bag inside an insulated sample cooler with ice. Prior to shipment of the samples to the laboratory, a chain of custody (COC) form was completed by the field sample custodian. Sample locations, sample identification numbers, description of samples, number of samples collected, and specific laboratory analyses to be performed on the samples were recorded on the COC form. The COC was signed by the field personnel relinquishing the samples to the courier and was signed by the laboratory upon receipt of the cooler. Seeps and Creeks Investigation Report 10 August 26, 2019 2.2.4 Field QA/QC The following field QA/QC samples were collected and analyzed along with the investigative samples: • February 2019 Event o One equipment blank o Six field blanks • May 2019 Event o Three equipment blanks o Seven field blanks o Five field duplicates • June 2019 Event o One equipment blank o One field blank o One field duplicate 2.2.5 Creek and Seep Sample Collection Methods Creek and seep water samples were collected as grab samples. Sample bottles were lowered into the flowing water of the creek to collect the sample. The bottles were lowered into the stream either using a properly decontaminated dip rod with bottle attached with a nylon zip tie, or in shallow streams, by hand. The bottle was lowered into the stream with the cap removed, open and facing oncoming flow. Where possible, the sample was collected from the middle of the stream. Care was taken to avoid collecting suspended solids or other materials in the sample. 2.2.6 Cape Fear River Water Sample Collection Methods Cape Fear River water samples were collected using a peristaltic pump and new dedicated HDPE tubing and dedicated silicone tubing for the pump head at each location. The tubing was lowered to the specified sampling depth below the water surface using an anchor weight and the tubing fastened to the anchor pointing upwards. Surface water was pumped directly from the submerged tubing through the pump head to a sample bottle. 2.2.7 Seep Identification Methods Seeps were identified for incorporation into the investigation by visual inspection and via temperature assessment. Seeps and Creeks Investigation Report 11 August 26, 2019 Visual Inspection Areas downgradient of the Site were inspected visually for channelized seeps. Such seeps were photographed and geolocated, and a sample was collected from the mouth of the seep before it reaches the river. Flow gauging was conducted at such locations using a weir, depending on site conditions. Temperature Assessment Areas of groundwater upwelling into surface water bodies were assessed using temperature differentials of groundwater versus surface water. Areas of upwelling were identified by placing a submersible temperature probe at the bottom of the stream and recording the temperature. If the temperature is similar to surface water temperatures, then the stream may not be in a zone of upwelling. However, if the stream bottom temperatures are different than surface water, groundwater is likely upwelling in this zone. Areas of upwelling were also identified by taking photographs of streams using an infrared camera where the water column was shallow enough to observe temperature differentials. The temperature assessment was only completed on Old Outfall 002 and only in the February event. In May and June, the temperature differences between groundwater and surface water were too similar, and the presence of seeping groundwater had been previously been identified in the February event in all seeps features. Infrared photographs are provided in Appendix C. Temperature assessments were conducted at Old Outfall 002 during part of the February Event (Table 1), on days when the ambient temperature was cool enough for the surface water/ groundwater temperature gradient to be observable. Otherwise, seeps were identified visually. 2.2.8 Flow Measurement Methods Flow rate was measured after sample collection by one or more of several methods, depending on stream bed geometry, stream morphology, site accessibility, and health and safety considerations. Flow Velocity Gauging The flow rate of the streams can be measured using a submersible flow meter in deeper (greater than one foot deep), less turbulent and more laminar flow sections of streams. The height of the water and stream bottom is first recorded from a uniform reference plane along the cross section of the stream at a minimum of 4 points along each transect. The flow meter is placed beneath the flowing stream along the cross section of the stream at regular intervals (e.g. 4-5 points along each transect) and the water velocity is recorded Seeps and Creeks Investigation Report 12 August 26, 2019 at a minimum of 3 water depths at each point along the transect (e.g. top-third, middle- third and bottom-third of the water column). These measurements are then used to calculate the volumetric flow of water passing through the feature based on the geometry and measured flow rates. A description of flow velocity measurement data is provided in Appendix D. Salt Dilution Streamflow Gauging The flow of streams can be measured by dosing at a constant flow rate into the stream a sodium chloride solution at a known concentration (Moore, 2004). Using a Mariotte bottle or constant flow pump, the salt solution was dosed into the flowing stream at a known flow rate. The relative concentration of salt in the stock solution and in the stream was measured using a conductivity probe reporting the result in units of microsiemens per centimeter (µS/cm). Using the known flow rate of the stock solution and the known concentrations of the stream and stock solution, the flow rate of the stream was calculated. Details on the salt dilution gauging data are provided in Appendix E. Weir Installation Temporary weirs were installed during the May and June events at some locations to refine previous flow rate estimates determined by flow velocity gauging and salt dilution streamflow gauging. Weirs were installed at accessible locations at the mouths of surface water features where the channel was at least 1.5 feet wide. Weirs were driven into the channel bottoms and sides and then stabilized. Water level, weir plate notch height from the creek bed, horizontal distance of the measurement point from the weir plate along the creek channel, thickness of downstream water column, and creek width at the weir installation location were recorded and used to calculate flow rate. Supporting details on weir installation are provided in Appendix F. 2.2.9 Documentation The project field team kept a daily record of field activities during the execution of field work including sampling notes and observations, instrument calibration records, sample COC, and shipping records. 2.3 Laboratory Methods 2.3.1 Analytical Methods Samples were analyzed for PFAS by the following methods: Seeps and Creeks Investigation Report 13 August 26, 2019 • Table 3+ Laboratory Standard Operating Procedure (SOP); and • EPA Method 537 Mod (Laboratory SOP). PFAS reported under each of these methods are listed in Table 2. 2.3.2 Laboratory QA/QC Field sampling and laboratory analyses were performed in accordance with the Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c). Samples were collected by the field team and shipped to TestAmerica Sacramento (TestAmerica) or Eurofins Lancaster Laboratories (Lancaster) under COC. Laboratory analyses were performed within the guidelines specified by the laboratory SOPs. The collection frequency of field duplicates, matrix spike / matrix spike duplicates (MS/MSD), field blanks, and equipment blanks was largely in accordance with the Creeks, Old Outfall 002 and Seeps Assessment Workplan (Geosyntec, 2019c). In some instances, field QA/QC sample collection deviated from the Workplan due to the significant amount of equipment and bottleware that the field team needed to carry with them. Flow measurement and collection of investigative samples were deemed the top priorities. Sufficient field QA/QC samples were collected to evaluate the data quality. Seeps and Creeks Investigation Report 14 August 26, 2019 3. RESULTS AND OBSERVATIONS Over three field events (February, May and June 2019) field teams identified four seeps, of varying size and reach discharging directly from the Site to the Cape Fear River. These seeps (A to D), Old Outfall 002 and Willis and Georgia Branch Creeks were gauged for flow, and samples collected to assess PFAS concentrations. Sampling was conducted under wet and dry conditions. In total 94 discrete water samples were collected from the seeps and creeks for PFAS analysis. A temperature survey of Old Outfall 002 was conducted to evaluate temperature variations as an indicator for groundwater upwelling. 3.1 Laboratory Analytical Data Quality All data were reviewed using the Data Verification Module (DVM) within the LocusTM Environmental Information Management (EIM) system, which is a commercial software program used to manage data. Following the DVM process, a manual review of the data was conducted. The DVM and the manual review results were combined in a data review narrative report for each set of sample results, which were consistent with Stage 2b of the EPA Guidance for Labeling Externally Validated Laboratory Analytical Data for Superfund Use (EPA-540-R-08-005 2009). The narrative report summarizes which samples were qualified (if any), the specific reasons for the qualification, and any potential bias in reported results. The data usability, in view of the project’s data quality objectives (DQOs), was assessed and the data were entered into the EIM system. The data were evaluated by the DVM against the following data usability checks: • Hold time criteria; • Field and laboratory blank contamination; • Completeness of QA/QC samples; • MS/MSD recoveries and the relative percent differences (RPDs) between these spikes; • Laboratory control sample/control sample duplicate recoveries and the RPD between these spikes; • Surrogate spike recoveries for organic analyses; and • RPD between field duplicate sample pairs. The manual review includes instrument-related QC results for calibration standards, blanks, and recoveries. The data review process (DVM plus manual review) applied the following data evaluation qualifiers to analysis results, as warranted: Seeps and Creeks Investigation Report 15 August 26, 2019 • J – Analyte present. Reported value may not be accurate or precise; • UJ – Analyte not detected. Reporting limit may not be accurate or precise; and • B – Analyte detected in a blank sample. Reported value may have high bias. The data review process described above was performed for all laboratory chemical analysis data generated for the sampling events. The DQOs were met for the analytical results for accuracy and precision. The data collected are believed to be complete, representative, and comparable. 3.1.1 Data Management and Reporting Chemours’s Analytical Data Quality Management team currently uses the EIM system for management of analytical data, xyz Site coordinate data, and field parameter data. Validation and qualification of data are performed by AECOM, who maintains the EIM system for the Chemours Fayetteville Site. A whitebook consisting of the data review narrative and the laboratory analytical report produced by AECOM summarizes the findings of the DVM and manual review process (Appendix G). 3.1.2 QA/QC Samples PFAS concentrations for all field QA/QC samples are reported in Table 4. The following observations were noted for the QA/QC samples: • No PFAS were detected above the associated reporting limits in the equipment blanks submitted for analysis. • No PFAS were detected above the associated reporting limits in the field blanks submitted for analysis, with the following exceptions: o Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid (PFO5DA) was detected at or above the associated reporting limit (34 nanograms per liter [ng/L]) in one field blank collected in the February 2019 Event (370 ng/L) and in two field blanks collected in the May 2019 Event (34 ng/L and 37 ng/L). The February 2019 field blank result was J-qualified along with associated investigative samples collected the same day. PFO5DA in the May 2019 field blanks were both detected at or within 5-times the reporting limit. No further qualification was required. o Byproduct 5 was detected at the reporting limit (58 ng/L) in one field blank collected in the February 2019 Event. No further qualification was required. Seeps and Creeks Investigation Report 16 August 26, 2019 o HFPO-DA was detected within 5-times the reporting limit (1.8 ng/L) in one field blank collected in the February 2019 Event (2.2 ng/L J). No further qualification was required. o Byproduct 1 was detected at the reporting limit (27 ng/L) in one field blank collected in the May 2019 Event. No further qualification was required. • The RPD for all field duplicate pairs was less than 30% for all PFAS, or less than 50% for PFAS detected within a factor of five of the associated reporting limits, with the following exceptions: o Byproduct 4 was detected at 20 ng/L in the parent sample FAY-SW-CFR- KINGS-052319 and was non-detect at the reporting limit (2 ng/L) in the associated field duplicate FAY-SW-CFR-KINGS-052319-D. The parent sample FAY-SW-CFR-KINGS-052319 was J-qualified during the DVM review as estimated. o Byproduct 5 was detected at 2 ng/L in the parent sample FAY-SW-CFR- RM-56-060719 and was detected at 4.5 ng/L in the associated field duplicate FAY-SW-CFR-RM-56-060719-D. Both results were J-qualified during the DVM review as estimated. • In addition to data validation based on the field QA/QC results, field results were qualified based on laboratory QA/QC results, as described in the laboratory reports and DVM reports in Appendix G. Several results were J-qualified due to laboratory hold time exceedances, discussed further below in Section 3.2. In addition, some results, including those for some samples collected in the Cape Fear River upstream of the Site, were J-qualified and biased high due to variable matrix spike recoveries. These sample results are discussed further below in Section 3.3.4. 3.2 Results Seeps identified during the Seeps and Creeks Investigation are shown on Figures 3A and 3B. The summary of locations identified via temperature assessment are reported in Table 5. Temperature assessments were conducted at Old Outfall 002 during part of the February Event (Table 1), on days when the ambient temperature was cool enough for the surface water/ groundwater temperature gradient to be observable. Otherwise, seeps were identified visually. Infrared photographs are provided in Appendix C. During some days in the February event, the May, and June events, the potential temperature differential was not significant enough to utilize this method to identify groundwater upwelling, and the presence of seeping groundwater had previously been identified in the February event in all seep features. Seeps and Creeks Investigation Report 17 August 26, 2019 PFAS concentrations for samples collected during the Seeps and Creeks Investigation are reported in Table 4. Total Table 3+ Laboratory SOP concentrations are also reported in Table 4. Figures 4A, 4B, and 4C present the total Table 3+ Laboratory SOP concentrations reported for samples collected in February, May, and June, respectively. Figures 5A, 5B, and 5C present the HFPO-DA concentrations reported for samples collected in February, May, and June, respectively. Figure 6A presents the total Table 3+ Laboratory SOP concentrations reported for samples collected from the Cape Fear River in February, May, and June. Figure 6B presents the HFPO-DA concentrations reported for samples collected from the Cape Fear River in February, May, and June. Table 6A summarizes the total Table 3+ Laboratory SOP concentrations at select locations, and Table 6B summarizes the HFPO-DA concentrations at select locations. Appendix G provides the analytical reports and data review narrative whitebook for the Seeps and Creeks Investigation. Several Table 3+ analytical compound results were J-qualified, as estimated, due to laboratory hold time exceedances. The hold time exceedances are largely due to additional time required by the laboratories to complete method development of Table 3+. Since these hold time exceedances did not result in rejection of the results, the J- qualified data still meet data quality standards and are usable as reported. Calculated flow rates for all locations measured during the Seeps and Creeks Investigation are reported in Table 7. Table 8A presents the estimated flow rates measured for Seeps A through D and Georgia Branch Creek and Willis Creek, respectively, using the specified flow gauging method during each field event. Table 8B presents the estimated flow rates measured for Old Outfall 002 using available flow gauging techniques during each field event. The estimated flow rates are determined based on the geometric mean of field measurements. 3.2.1 Analytical Laboratory Compound Reporting Limits Several PFAS reported in Table 4 were not detected at elevated reporting limits. The laboratories originally ran the samples using the high-level analysis as a precaution against instrumentation fouling. Now that more information on relative concentrations have been identified, future collected water samples for Table 3+ compounds will be analyzed at low-level analysis where appropriate which should provide lower reporting limits. Seeps and Creeks Investigation Report 18 August 26, 2019 3.2.2 Flow Gauging Limitations and Assumptions The flow gauging methods used in this investigation depended upon stream bed geometry, stream morphology, site accessibility, and health and safety considerations. The following limitations and assumptions were noted during flow gauging activities that may affect the accuracy of results. Table 7 identifies calculated flow rates that may be inaccurate due to these limitations. Flow velocity gauging is most accurate in deep, less turbulent and more laminar flow sections of streams. This method depends on uniform water column thickness, so it becomes inaccurate if water column thickness is variable. This is often difficult to observe in deep or turbid water. Salt dilution gauging becomes less accurate in streams with complex morphology and in very shallow streams, since this method requires relatively uniform flow across the width of a channel. Comparison of flow rates determined by salt dilution gauging to those determined by other methods indicates that salt dilution gauging tended to estimate higher flows when flows were less than 100 gallons per minute (GPM) and estimate lower flows when flows were greater than 100 GPM relative to the other methods. Weir gauging requires all flow in a stream be diverted towards the weir. Any flow under or around the weir may lead to underestimates of flow rates. This is particularly challenging in sandy streams where water can flow through the sandy substrate of the stream bypassing the weir, and if there are tree roots or other debris present that can provide a preferential flow pathway also bypassing the weir. 3.3 Observations Several seeps were identified during the Seeps and Creeks Investigation (Figure 3A and 3B). Both Seep A and Seep B can be traced from near the top of the bluff at the Site facilities down to the Cape Fear River. Seep C and Seep D both appear to begin farther from the facility and closer to the Cape Fear River. During field investigations, an additional branch of Seep A was identified, this surface water at this area is most likely discharging water from the pump house (located just north of SEEP-A-5-B-1 to the main section of Seep A as shown in Figure 3A). At Seep A, near location SEEP-A-3-B12, runoff from the parking lot at Chemours Monomers IXM appeared to contribute water flow to the seep (Figure 3A). Several seeps were also identified in Old Outfall 002, Willis Creek, and Georgia Branch Creek (as identified in Figures 2A, 2B, and 2C). Seeps and Creeks Investigation Report 19 August 26, 2019 3.3.1 February 2019 Event The February 2019 event was a dry weather event. Elevated PFAS concentrations were reported in samples collected from Seep A, Seep B, Seep C, and Old Outfall 002. In each of the seeps, at least two samples collected were reported to have total Table 3+ compounds greater than 100,000 ng/L. Samples collected from Seep A, Seep B, and Seep C were reported to have HFPO-DA concentrations typically between 10,000 ng/L and 100,000 ng/L, while samples collected from all locations along Old Outfall 002 were reported to have concentrations less than 10,000 ng/L. Lower concentrations were observed in Willis Creek, with total Table 3+ concentrations less than 2,200 ng/L. No consistent trend was observed moving upgradient to downgradient in Seeps A, B, and C and Old Outfall 002, while the samples collected from Willis Creek reported higher PFAS concentration closer to the Cape Fear River. Samples were not collected from Seep D or the portion of Seep A in the vicinity of the pump house during the February Event since they had not been identified at that time. Samples were not collected from Georgia Branch Creek due to delayed access approvals. 3.3.2 May 2019 Event The May 2019 event was a dry weather event. Samples collected from Seep A, Seep B, Seep C, and Old Outfall 002 had PFAS concentrations, similar to those observed in February. Seep D was identified in May and samples collected and analyzed were reported to have total Table 3+ compounds of approximately 170,000 ng/L. Samples were also collected from the portion of Seep A in the vicinity of the pump house. The samples analyzed from the water collected at these locations have total Table 3+ compound concentrations similar to samples collected from other portions of Seep A. HFPO-DA concentrations in samples collected from the seeps and Old Outfall 002 in May were similar in magnitude to those collected in February. PFAS concentrations in the samples collected from Willis Creek were higher in May than in February, with total Table 3+ compounds between 3,000 ng/L and 22,000 ng/L. PFAS concentrations in samples collected along Georgia Branch Creek were observed to have total Table 3+ compounds between 1,100 and 3,500 ng/L. Both the sample collected at the excess river water location and the sample collected at Outfall 002 were non-detect for HFPO-DA in May, with a reporting limit of 86 ng/L. All Table 3+ compounds were similarly non-detect. Subsequent samples collected in June at these locations had improved reporting limits. 3.3.3 June 2019 Event The June 2019 Event was a wet weather event. Samples were primarily collected from the mouths of the seeps and creeks. PFAS concentrations in samples collected at these Seeps and Creeks Investigation Report 20 August 26, 2019 locations were similar to those observed in February and May. The precipitation leading up to the wet June event did not appear to affect PFAS concentrations in the seeps and creeks. The sample collected at the excess river water location in June had total Table 3+ concentration of less than 130 ng/L with HFPO-DA reported at 28 ng/L. The sample collected at Outfall 002 had total Table 3+ concentration of approximately 1,800 ng/L with HFPO-DA reported at 40 ng/L. These results are similar to previous observations at the excess river water location and Outfall 002. 3.3.4 Cape Fear River Concentrations PFAS concentrations in the Cape Fear River are presented in Figure 6A and 6B. PFAS concentrations reported from samples collected during the February Event are higher downstream (River Mile 84) than upstream (River Mile 76) of the Site (e.g., HFPO-DA concentration of 13 ng/L downstream and 2.9 J ng/L upstream). In May, upstream samples collected at River Mile 56, 68, and 76 were non-detect at the reporting limit for HFPO-DA. Downstream concentrations were higher, with HFPO-DA concentrations of 28 ng/L at Bladen Bluffs and 17 ng/L at Kings Bluff. In June, HFPO-DA concentrations followed similar patterns to the May samples, with low to non-detect results upstream and results between 30 and 60 ng/L downstream. Other PFAS, particularly Byproduct 4, Byproduct 5, and perfluoroethoxysulfonic acid (NVHOS) were observed in the upstream Cape Fear River samples in May and June 2019 at River Miles 56 and 68. The results for these compounds were J-qualified due to variable recoveries in the matrix spikes outside the acceptable range defined in the SOP which may cause the results to be overestimated. The detection of these compounds is not consistent with known transport pathways for PFAS originating from the facility. Specifically, in offsite groundwater, which is the transport pathway leading to upstream detections attributable to aerial emissions of PFAS from the facility, PMPA is the compound detected at the highest concentrations based on groundwater data reported in the Post Florence Report (Geosyntec, 2019f). Therefore, PMPA is expected to be detected first amongst the PFAS potentially reaching the river from offsite groundwater in the upstream river samples. In samples from River Mile 56, only these three Table 3+ samples are detected. While closer to Site in the upstream river at River Mile 68 PMPA is detected consistent with expected trends from offsite groundwater. These observations of Byproduct 4, Byproduct 5 and NVHOS will be further evaluated spatially and temporally through additional sampling events in the Cape Fear River to further understand their concentration and distribution. Seeps and Creeks Investigation Report 21 August 26, 2019 3.3.5 Flow Observations Seeps A and B have larger reaches compared to Seeps C and D and they were observed to have higher flow rates compared to Seeps C and Seep D. Flow rates at the mouths of Seeps A and B were 60 to 110 GPM and 50 to 90 GPM, respectively, determined by salt dilution gauging, while flow rates at the mouths of Seeps C and D were 10 to 15 GPM and 20 to 50 GPM, respectively, determined by salt dilution gauging and weir gauging. Flow rates in the seeps were variable between February, May, and June. Flow rates in Willis Creek were highest in June compared to February and May, which may be related to the precipitation observed prior to the June Event compared to the dry weather events in February and May. As discussed in Section 3.2.2, there are limitations to each of the flow gauging methods applied during the Seeps and Creeks Investigation. Table 7 and Table 8B demonstrate the variability in flow gauge results across these methods due to their limitations. The variability observed in the flow gauging results may be related to these limitations, which provide a foundation for continued flow assessment to increase understanding of seasonal variability and variability due to precipitation. Seeps and Creeks Investigation Report 22 August 26, 2019 4. SUMMARY AND PLANNED FUTURE ACTIONS This report provides a summary of the investigative activities and results of the Seeps and Creeks Investigations, conducted in February, May, and June 2019. The objectives of these field investigations were met. Seeps were identified, seep and creek flow rates measured, upwelling in stream beds was assessed and water samples collected from the seeps and creeks were analyzed for PFAS. These data further inform the site conceptual model and provide empirical data for the mass loading model that is being developed. Four seeps (A to D) on the western edge of the Cape Fear River were identified and groundwater contributions to the seeps were investigated. Visual observations, flow gauging and temperature surveys were used in various locations to assess seepage. Seeps A and B have larger reaches compared to Seeps C and D and they were observed to have higher flow rates compared to Seeps C and D. Flow rates at the mouths of Seeps A and B were 60 to 110 GPM and 50 to 90 GPM, respectively, determined by salt dilution gauging, while flow rates at the mouths of Seeps C and D were 10 to 15 GPM and 20 to 50 GPM, respectively. Flow rates in the seeps were variable between February, May, and June. Flow rates in Willis Creek were highest in June compared to February and May, which may be related to the precipitation observed prior to the June Event compared to the dry events in February and May. In this program more than 90 samples from Seeps, Willis and Georgia Branch Creeks and Old Outfall 002 were collected and analyzed for PFAS and Table 3+ compounds. The results of these characterization activities indicate that the seeps and creeks contribute PFAS load to the Cape Fear River. The results included in this report provide a preliminary understanding of flow conditions in the seeps and PFAS concentrations from these seeps and creeks that are reaching the Cape Fear River. The contents of this report support the PFAS mass loading evaluation prepared pursuant to Paragraph 12(a) in the executed Consent Order. The results of the Seeps and Creeks Investigation provide data to inform the Mass Loading Model on the contributions of PFAS from the seeps and Creeks to the Cape Fear River. The seeps along the bluff were investigated. There are numerous locations within the seeps where the temperature profiles indicate upwelling of groundwater. Multiple flow gauging events were completed to understand the flow from the creeks and seeps. Seeps and Creeks Investigation Report 23 August 26, 2019 In order to evaluate potential variability in flow and PFAS concentrations over time and due to seasonality effects, Geosyntec recommends that a monitoring program continue with six additional quarterly rounds of sampling and flow gauging activities for the Seeps, Old Outfall 002, Outfall 002, Willis Creek, Georgia Branch Creek, and the Cape Fear River upstream and downstream of the Site. The contents of this report support the PFAS mass loading evaluation prepared pursuant to Paragraph 12(a) in the executed Consent Order. The results of the Seeps and Creeks Investigation provided data to inform the Mass Loading Model which in turn informs the Reductions Plan. Seeps and Creeks Investigation Report 24 August 26, 2019 5. REFERENCES Geosyntec, 2018. Assessment of the Chemical and Spatial Distribution of PFAS in the Cape Fear River. Chemours Fayetteville Works. 17 September 2018. Geosyntec, 2019a. Site Associated PFAS Fate and Transport Study, Chemours Fayetteville Works. June, 2019. Geosyntec, 2019b. Cape Fear River Mass Loading Model Assessment and Paragraph 11.1 Characterization of PFAS at Intakes. August, 2019. Geosyntec, 2019c. Creeks, Old Outfall 002 and Seeps Assessment Workplan. February 12, 2019. Geosyntec, 2019d. Additional Creeks, Old Outfall 002 and Seeps Investigation Plan. May 13, 2019. Geosyntec, 2019e. Willis Creek and Seep D Assessment Plan. June 17, 2019 Geosyntec, 2019f. Post Hurricane Florence PFAS Characterization. Chemours Fayetteville Works. April 2019. Moore, R.D., 2004. Introduction to salt dilution gauging for streamflow measurement: Part 1. Streamline Watershed Management Bulletin, 7(4), pp.20-23. Parsons 2018. Long Term Monitoring Plan. Chemours Fayetteville Works. RCRA PERMIT NO. NCD047368642-R2-M3. Wang, Z. et al., 2017. A never-ending story of per- and polyfluoroalkyl substances (PFASs)? Environmental Science and Technology, 51(5), pp 2508-2518. TABLES TABLE 1LOCATION SUMMARYChemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC P.C.February May June February May June February May JuneOLDOF-1 Old Outfall 002 Location 1 Y -- -- Y -- -- -- -- --OLDOF-2 Old Outfall 002 Location 2YYYYYY------OLDOF-2J Old Outfall 002 Location 2J Y -- -- -- -- -- Y -- --OLDOF-2L Old Outfall 002 Location 2L Y -- -- -- -- -- Y -- --OLDOF-3 Old Outfall 002 Location 3 Y -- -- Y -- -- -- -- --OLDOF-4 Old Outfall 002 Location 4 Y -- -- -- -- -- -- -- --OLDOF-5 Old Outfall 002 Location 5 Y -- -- Y -- -- -- -- --OLDOF-5K Old Outfall 002 Location 5K Y -- -- -- -- -- Y -- --OLDOF-TR1-1 (1)Old Outfall 002 Tributary 1 Location 1 Y----Y----------OLDOF-TR1-1-1 (1)Old Outfall 002 Tributary 1 Location 1 Y----------------SEEP-A-1Seep A Location 1YYYYYY------SEEP-A-10 Seep A Location 10YY--------------SEEP-A-11 Seep A Location 11Y----------------SEEP-A-12 Seep A Location 12Y----------------SEEP-A-2Seep A Location 2Y----------------SEEP-A-3Seep A Location 3YYYYYY------SEEP-A-4Seep A Location 4YYYYYY------SEEP-A-5Seep A Location 5YY----Y--------SEEP-A-5-B-1 Seep A5 Location B1--Y--------------SEEP-A-5-D1-2 Seep A5 Location D1-2--Y--------------SEEP-A-6Seep A Location 6Y----------------SEEP-A-7Seep A Location 7Y----------------SEEP-A-8Seep A Location 8Y----------------SEEP-A-9Seep A Location 9Y----------------SEEP-A-TR1 (2)Seep A Tributary 1--Y--------------SEEP-A-TR1-1 (2)Seep A Tributary 1----Y--Y--------SEEP-A-TR2-1 Seep A Tributary 2-1--Y--------------SEEP-A-TR3-1 Seep A Tributary 3-1--Y--------------SEEP-A-TR4-1 Seep A Tributary 4-1--Y--------------SEEP-B-1Seep B Location 1YYYY--Y------SEEP-B-2Seep B Location 2YYYYYY------SEEP-B-3Seep B Location 3Y----Y----------SEEP-B-3-A (3)Seep B Location 3A--Y--Y----------SEEP-B-3-A1 (3)Seep B Location 3AY----------------SEEP-B-3-E4 Seep B Location 3E4Y----------------SEEP-B-4Seep B Location 4Y----------------SEEP-B-4-A3 Seep B Location 4A3Y----------------SEEP-B-TR1 Seep B Tributary 1--YY------------SEEP-B-TR2 Seep B Tributary 2--YY----Y------Temperature AssessmentLocation DescriptionFlow MeasurementSample CollectionLocation IDPage 1 of 2August 2019 TABLE 1LOCATION SUMMARYChemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC P.C.February May June February May June February May JuneTemperature AssessmentLocation DescriptionFlow MeasurementSample CollectionLocation IDSEEP-C-1Seep C Location 1YYYYYY------SEEP-C-1-E2 Seep C Location 1E2Y----------------SEEP-D-1Seep D Location 1--YY--YY------WC-1Willis Creek Location 1YYYYYY------WC-1-TR1 Willis Creek Location 1 Tributary 1--Y--------------WC-1-TR2 Willis Creek Location 1 Tributary 2--Y------Y------WC-2Willis Creek Location 2Y----------------WC-3Willis Creek Location 3Y----------------WC-3-TR2 Willis Creek Location 3 Tributary 2--Y------Y------WC-3-TR3 Willis Creek Location 3 Tributary 3--Y------Y------WC-3-TR5 Willis Creek Location 3 Tributary 5----------Y------WC-4Willis Creek Location 4Y----------------WC-4-TR1 Willis Creek Location 4 Tributary 1--Y------Y------WC-5Willis Creek Location 5Y----Y----------GBC-1Georgia Branch Creek Location 1--YY--YY------GBC-2Georgia Branch Creek Location 2--Y--------------GBC-3Georgia Branch Creek Location 3--Y--------------GBC-5Georgia Branch Creek Location 5--Y--------------GBC-6Georgia Branch Creek Location 6--Y--------------GBC-7Georgia Branch Creek Location 7--Y--------------GBC-TR1-1 Georgia Branch Creek Tributary 1--Y--------------GBC-TR2-1 Georgia Branch Creek Tributary 2--Y--------------CFR-MILE-56 Cape Fear River Mile 56--YY------------CFR-MILE-68 Cape Fear River Mile 68--YY------------CFR-MILE-76 Cape Fear River Mile 76YYY------------CFR-MILE-84 Cape Fear River Mile 84Y----------------CFR-BLADEN Cape Fear River at Bladen Bluffs--YY------------CFR-KINGS Cape Fear River at Kings Bluff--YY------------Notes:Y - Sampling, flow measurement, or temperature assessment was conducted(1) - Location IDs OLDOF-TR1-1 and OLDOF-TR1-1-1 represent the same location. Two location IDs are listed due to naming inconsistencies between the field and the laboratory. (2) - Location IDs SEEP-A-TR1 and SEEP-A-TR1-1 represent the same location. Two location IDs are listed due to naming inconsistencies between the field and the laboratory. (3) - Location IDs SEEP-B-3-A and SEEP-B-3-A1 represent the same location. Two location IDs are listed due to naming inconsistencies between the field and the laboratory. Page 2 of 2August 2019 TABLE 2 PFAS AND ASSOCIATED ANALYTICAL METHODS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. HFPO-DA* Hexafluoropropylene oxide dimer acid 13252-13-6 C6HF11O3 PEPA Perfluoroethoxypropyl carboxylic acid 267239-61-2 C5HF9O3 PFECA-G Perfluoro-4-isopropoxybutanoic acid 801212-59-9 C12H9F9O3S PFMOAA Perfluoro-2-methoxyaceticacid 674-13-5 C3HF5O3 PFO2HxA Perfluoro(3,5-dioxahexanoic) acid 39492-88-1 C4HF7O4 PFO3OA Perfluoro(3,5,7-trioxaoctanoic) acid 39492-89-2 C5HF9O5 PFO4DA Perfluoro(3,5,7,9-tetraoxadecanoic) acid 39492-90-5 C6HF11O6 PMPA Perfluoromethoxypropyl carboxylic acid 13140-29-9 C4HF7O3 Hydro-EVE Acid Perfluoroethoxsypropanoic acid 773804-62-9 C8H2F14O4 EVE Acid Perfluoroethoxypropionic acid 69087-46-3 C8HF13O4 PFECA B Perfluoro-3,6-dioxaheptanoic acid 151772-58-6 C5HF9O4 R-EVE R-EVE N/A C8H2F12O5 PFO5DA Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid 39492-91-6 C7HF13O7 Byproduct 4 Byproduct 4 N/A C7H2F12O6S Byproduct 5 Byproduct 5 N/A C7H3F11O7S Byproduct 6 Byproduct 6 N/A C6H2F12O4S NVHOS Perfluoroethoxysulfonic acid 1132933-86-8 C4H2F8O4S PES Perfluoroethoxyethanesulfonic acid 113507-82-7 C4HF9O4S PFESA-BP1 Byproduct 1 29311-67-9 C7HF13O5S PFESA-BP2 Byproduct 2 749836-20-2 C7H2F14O5S PFBA Perfluorobutanoic acid 375-22-4 C4HF7O2 PFDA Perfluorodecanoic acid 335-76-2 C10HF19O2 PFDoA Perfluorododecanoic acid 307-55-1 C12HF23O2 PFHpA Perfluoroheptanoic acid 375-85-9 C7HF13O2 PFNA Perfluorononanoic acid 375-95-1 C9HF17O2 PFOA Perfluorooctanoic acid 335-67-1 C8HF15O PFHxA Perfluorohexanoic acid 307-24-4 C6HF11O2 PFPeA Perfluoropentanoic acid 2706-90-3 C5HF9O2 PFTeA Perfluorotetradecanoic acid 376-06-7 C14HF27O2 PFTriA Perfluorotridecanoic acid 72629-94-8 C13HF25O2 PFUnA Perfluoroundecanoic acid 2058-94-8 C11HF21O2 PFBS Perfluorobutanesulfonic acid 375-73-5 C4HF9SO PFDS Perfluorodecanesulfonic acid 335-77-3 C10HF21O3S PFHpS Perfluoroheptanesulfonic acid 375-92-8 C7HF15O3S PFHxS Perfluorohexanesulfonic acid 355-46-4 C6HF13SO3 PFNS Perfluorononanesulfonic acid 68259-12-1 C9HF19O3S PFOS Perfluorooctanesulfonic acid 1763-23-1 C8HF17SO3 PFPeS Perfluoropentanesulfonic acid 2706-91-4 C5HF11O3S 10:2 FTS 10:2-fluorotelomersulfonic acid 120226-60-0 C12H5F21O3 4:2 FTS 4:2 fluorotelomersulfonic acid 757124-72-4 C6H5F9O3S 6:2 FTS 6:2 fluorotelomersulfonic acid 27619-97-2 C8H5F13SO3 8:2 FTS 8:2 fluorotelomersulfonic acid 39108-34-4 C10H5F17O3S NEtFOSAA NEtFOSAA 2991-50-6 C12H8F17NO4S NEtPFOSA NEtPFOSA 4151-50-2 C10H6F17NO2S NEtPFOSAE NEtPFOSAE 1691-99-2 C12H10F17NO3S NMeFOSAA NMeFOSAA 2355-31-9 C11H6F17NO4S NMePFOSA NMePFOSA 31506-32-8 C9H4F17NO2S NMePFOSAE NMePFOSAE 24448-09-7 C11H8F17NO3S PFDOS Perfluorododecanesulfonic acid 79780-39-5 C12HF25O3S PFHxDA Perfluorohexadecanoic acid 67905-19-5 C16HF31O2 PFODA Perfluorooctadecanoic acid 16517-11-6 C18HF35O2 PFOSA Perfluorooctanesulfonamide 754-91-6 C8H2F17NO2S Notes: *Depending on the laboratory, HFPO-DA may also appear on the EPA Method 537 Mod analyte list EPA - Environmental Protection Agency PFAS - per- and polyfluoroalkyl substances SOP - Standard Operating Procedure CASN Chemical Formula Table 3+ Lab SOP EPA Method 537 Mod Analytical Method Common Name Chemical Name August 2019 TABLE 3 TOTAL DAILY PRECIPITATION - FEBRUARY, MAY, AND JUNE 2019 Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Date Total Precipitation (inches) 1/29/2019 0.09 1/30/2019 -- 1/31/2019 -- 2/1/2019 -- 2/2/2019 -- 2/3/2019 -- 2/4/2019 -- 2/5/2019 -- 2/6/2019 -- 2/7/2019 -- 2/8/2019 -- 2/9/2019 -- 2/10/2019 -- 2/11/2019 0.25 2/12/2019 0.25 2/13/2019 0.02 2/14/2019 -- 2/15/2019 -- 2/16/2019 0.6 2/17/2019 0.04 2/18/2019 0.12 2/19/2019 0.11 2/20/2019 0.19 2/21/2019 0.16 2/22/2019 0.28 2/23/2019 0.46 2/24/2019 0.01 2/25/2019 -- 2/26/2019 -- 2/27/2019 -- 2/28/2019 -- 5/1/2019 -- 5/2/2019 -- 5/3/2019 -- 5/4/2019 0.16 5/5/2019 0.39 5/6/2019 -- 5/7/2019 -- 5/8/2019 -- 5/9/2019 -- 5/10/2019 -- 5/11/2019 -- 5/12/2019 0.13 5/13/2019 -- 5/14/2019 -- 5/15/2019 -- 5/16/2019 -- 5/17/2019 -- Page 1 of 2 August 2019 TABLE 3 TOTAL DAILY PRECIPITATION - FEBRUARY, MAY, AND JUNE 2019 Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Date Total Precipitation (inches) 5/18/2019 -- 5/19/2019 -- 5/20/2019 0.24 5/21/2019 -- 5/22/2019 -- 5/23/2019 -- 5/24/2019 -- 5/25/2019 -- 5/26/2019 -- 5/27/2019 -- 5/28/2019 -- 5/29/2019 -- 5/30/2019 -- 5/31/2019 0.1 6/1/2019 -- 6/2/2019 -- 6/3/2019 -- 6/4/2019 -- 6/5/2019 0.8 6/6/2019 -- 6/7/2019 -- 6/8/2019 -- 6/9/2019 2.2 6/10/2019 0.8 6/11/2019 0.1 6/12/2019 0.4 6/13/2019 -- 6/14/2019 -- 6/15/2019 -- 6/16/2019 -- 6/17/2019 -- 6/18/2019 -- 6/19/2019 -- 6/20/2019 0.1 6/21/2019 -- 6/22/2019 0.2 6/23/2019 -- 6/24/2019 -- 6/25/2019 -- 6/26/2019 -- 6/27/2019 -- 6/28/2019 -- 6/29/2019 -- 6/30/2019 -- Notes: -- - below USGS measurement threshold Precipitation data obtained from USGS rain gauge at W.O. Huske Dam. Seeps and Creeks field event USGS - United States Geological Survey Page 2 of 2 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID OLDOF-1 OLDOF-1 OLDOF-2 OLDOF-2 Field Sample ID FAY-SW-OLDOF-1-020119 FAY-SW-OLDOF-1-020119 FAY-SW-OLDOF-2-020119 FAY-SW-OLDOF-2-020119 Laboratory Sample ID 9978959 / 9978962 320-51031-7 9978966 / 9978963 320-51031-8 Date Sampled 2/1/2019 2/1/2019 2/1/2019 2/1/2019 QA/QC -------- Laboratory Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento Table 3+ Lab SOP (ng/L) HFPO-DA -------- PEPA 1,900 J 1,900 J 1,900 J 2,000 J PFECA-G <50 UJ <41 UJ <50 UJ <41 UJ PFMOAA 83,000 J 93,000 J 83,000 J 92,000 J PFO2HxA 21,000 J 17,000 J 22,000 J 18,000 J PFO3OA 6,400 J 5,200 J 6,400 J 5,200 J PFO4DA 1,700 J 1,700 J 1,800 J 1,600 J PMPA 5,600 J 5,800 J 5,800 J 6,000 J Hydro-EVE Acid --200 J --200 J EVE Acid --<24 UJ --<24 UJ PFECA B --<60 UJ --<60 UJ R-EVE --190 J --190 J PFO5DA 670 B 970 B 820 B 950 B Byproduct 4 --450 J --420 J Byproduct 5 --1,200 J --1,300 J Byproduct 6 --<15 UJ --<15 UJ NVHOS --750 J --800 J PES --<46 UJ --<46 UJ PFESA-BP1 260 J 190 J 180 J 140 J PFESA-BP2 300 J 310 J 330 J 340 J N-ethylperfluoro-1-octanesulfonamide --<37 UJ --<37 UJ 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol --<60 UJ --<60 UJ N-methyl perfluoro-1-octanesulfonamide --<35 UJ --<35 UJ 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol --<110 UJ --<110 UJ Total Table 3+ Compounds*130,000 140,000 EPA Method 537 Mod (ng/L) HFPO-DA 4,800 J --5,900 -- Perfluorobutanoic Acid 77 ------ Perfluorodecanoic Acid <1.7 ------ Perfluorododecanoic Acid <1.7 ------ Perfluoroheptanoic Acid 25 ------ Perfluorononanoic Acid 7.4 ------ Perfluorooctanoic acid 28 ------ Perfluorohexanoic Acid 14 ------ Perfluoropentanoic Acid 170 ------ Perfluorotetradecanoic Acid <0.86 ------ Perfluorotridecanoic Acid <0.86 ------ Perfluoroundecanoic Acid <1.7 ------ Perfluorobutane Sulfonic Acid 1.4 J ------ Perfluorodecane Sulfonic Acid <1.7 ------ Perfluoroheptane sulfonic acid (PFHpS)<1.7 ------ Perfluorohexane Sulfonic Acid <1.7 ------ Perfluorononanesulfonic acid <1.7 ------ Perfluorooctanesulfonic acid 1.9 ------ Perfluoropentane sulfonic acid (PFPeS)<1.7 ------ 10:2 Fluorotelomer sulfonate <2.6 ------ 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)<2.6 ------ 6:2 Fluorotelomer sulfonate <1.7 ------ 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)<5.2 ------ N-ethyl perfluorooctane sulfonamidoacetic acid <2.6 ------ N-ethylperfluoro-1-octanesulfonamide <7.8 UJ ------ 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol <2.6 ------ N-methyl perfluorooctane sulfonamidoacetic acid <2.6 ------ N-methyl perfluoro-1-octanesulfonamide <7.8 UJ ------ 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol <2.6 ------ Perfluorododecane sulfonic acid (PFDoS)<0.86 ------ Perfluorohexadecanoic acid (PFHxDA)<0.86 ------ Perfluorooctadecanoic acid <1.7 ------ Perfluorooctane Sulfonamide <2.6 ------ ADONA <0.86 UJ ------ F-53B Major <0.86 UJ ------ F-53B Minor <1.7 UJ ------ Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. February 2019 Page 1 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. OLDOF-2J OLDOF-2J OLDOF-2L OLDOF-2L FAY-SW-OLDOF-2J-020219 FAY-SW-OLDOF-2J-020219 FAY-SW-OLDOF-2L-020219 FAY-SW-OLDOF-2L-020219 9979923 / 9979920 320-51031-3 9979927 / 9979924 320-51031-2 2/2/2019 2/2/2019 2/2/2019 2/2/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 1,400 J 1,300 J 2,100 J 2,100 J <50 UJ <41 UJ <50 UJ <41 UJ 630 J 490 J 99,000 J 104,000 J 1,700 J 1,300 J 23,000 J 21,000 J 400 J 290 J 6,900 J 5,400 J <50 UJ <79 UJ 2,100 J 1,800 J 3,700 J 3,700 J 6,200 J 6,200 J --<28 UJ --220 J --<24 UJ --<24 UJ --<60 UJ --<60 UJ --120 J --190 J <100 UJ 34 J 810 J 870 J --180 J --490 J --<58 UJ --1,500 J --<15 UJ --<15 UJ --<54 UJ --890 J --<46 UJ --<46 UJ <50 UJ <27 UJ 240 J 250 J <50 UJ 71 J 350 J 350 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 8,700 150,000 1,200 --6,400 -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 2 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. OLDOF-3 OLDOF-3 OLDOF-4 OLDOF-4 FAY-SW-OLDOF-3-020219 FAY-SW-OLDOF-3-020219 FAY-SW-OLDOF-4-020219 FAY-SW-OLDOF-4-020219 9979931 / 9979928 320-51031-4 9979935 / 9979932 320-51031-5 2/2/2019 2/2/2019 2/2/2019 2/2/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 2,200 J 2,000 J 2,400 J 2,300 J <50 UJ <41 UJ <50 UJ <41 UJ 110,000 J 109,000 J 140,000 J 140,000 J 25,000 J 23,000 J 31,000 J 25,000 J 7,400 J 5,500 J 9,000 J 7,100 J 2,200 J 1,800 J 2,800 J 2,100 J 6,600 J 6,600 J 7,300 J 7,000 J --240 J --310 J --<24 UJ --<24 UJ --<60 UJ --<60 UJ --220 J --240 J 850 J 790 J 1,100 J 1,100 J --560 J --620 J --1,800 J --1,900 J --18 J --19 J --1,100 J --1,200 J --<46 UJ --<46 UJ 100 J 170 J 230 J 240 J 400 J 420 J 480 J 470 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 160,000 200,000 5,600 --6,900 -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 3 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. OLDOF-5 OLDOF-5 OLDOF-5K OLDOF-5K FAY-SW-OLDOF-5-020219 FAY-SW-OLDOF-5-020219 FAY-SW-OLDOF-5K-020219 FAY-SW-OLDOF-5K-020219 9979943 / 9979940 320-51024-1 9979947 / 9979944 320-51024-2 2/2/2019 2/2/2019 2/2/2019 2/2/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 2,700 J 2,700 J 1,900 J 1,700 J <50 UJ <41 UJ <50 UJ <41 UJ 190,000 J 200,000 J 18,000 J 16,000 J 43,000 J 37,000 J 6,600 J 5,400 J 14,000 J 11,000 J 1,700 J 1,300 J 5,200 J 4,400 J 1,700 J 1,300 J 8,600 J 8,200 J 5,400 J 4,500 J --550 J --200 J --370 J --31 J --<60 UJ --<60 UJ --310 J --210 J 4,200 J 4,200 J 590 J 580 J --800 J --350 J --3,200 J --<58 UJ --32 J --15 J --1,700 J --210 J --<46 UJ --<46 UJ 4,600 J 3,700 J <50 UJ <27 UJ 990 J 990 J 540 J 500 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 290,000 39,000 7,600 --6,400 -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 4 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. OLDOF-TR1-1 OLDOF-TR1-1-1 SEEP-A-1 SEEP-A-1 FAY-SW-OLDOF-TR1-1-020219 FAY-SW-OLDOF-TR1-1-1-020219 FAY-SW-SEEP-A-1-020719 FAY-SW-SEEP-A-1-020719 320-51031-1 9979919 / 9979916 9982593 / 9982596 320-51045-13 2/2/2019 2/2/2019 2/7/2019 2/7/2019 -------- TestAmerica Sacramento Eurofins Lancaster Eurofins Lancaster TestAmerica Sacramento -------- 1,300 J 1,200 7,100 J 9,900 J <41 UJ <50 <50 UJ <41 UJ 340 J 550 62,000 J 84,000 J 1,600 J 1,800 35,000 J 41,000 J 270 J 280 12,000 J 14,000 J 160 J 170 6,800 J 8,100 J 3,800 J 3,300 19,000 J 25,000 J <28 UJ ----1,700 J <24 UJ ----960 J <60 UJ ----<60 UJ <70 UJ ----1,200 J 250 J <100 6,300 J 5,600 J <160 UJ ----2,200 J <58 UJ ----23,000 J <15 UJ ----47 J <54 UJ ----980 J <46 UJ ----<46 UJ <27 UJ <50 4,300 J 4,000 J 110 J 88 1,200 J 1,200 J <37 UJ ----<37 UJ <60 UJ ----<60 UJ <35 UJ ----<35 UJ <110 UJ ----<110 UJ 9,600 230,000 --1,800 10,000 J -- ----260 -- ----<1.7 -- ----<1.7 -- ----94 -- ----20 -- ----35 -- ----39 -- ----520 -- ----<0.85 -- ----<0.85 -- ----<1.7 -- ----1.4 -- ----<1.7 -- ----<1.7 -- ----2.9 -- ----<1.7 -- ----6.3 -- ----<1.7 -- ----<2.5 -- ----<2.5 -- ----<1.7 -- ----<5.1 -- ----<2.5 -- ----<7.6 UJ -- ----<2.5 -- ----<2.5 -- ----<7.6 UJ -- ----<2.5 -- ----<0.85 -- ----<0.85 -- ----<1.7 -- ----<2.5 -- ----<0.85 UJ -- ----<0.85 UJ -- ----<1.7 UJ -- February 2019 Page 5 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-10 SEEP-A-10 SEEP-A-11 SEEP-A-11 FAY-SW-SEEP-A-10-020719 FAY-SW-SEEP-A-10-020719 FAY-SW-SEEP-A-11-020719 FAY-SW-SEEP-A-11-020719 9982632 / 9982629 320-51045-22 9982636 / 9982633 320-51045-23 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 19,000 J 22,000 J 18,000 J 22,000 J <50 UJ <200 UJ <50 UJ <200 UJ 75,000 J 84,000 J 76,000 J 90,000 J 59,000 J 65,000 J 62,000 J 67,000 J 25,000 J 25,000 J 26,000 J 26,000 J 19,000 J 21,000 J 20,000 J 22,000 J 48,000 J 52,000 J 46,000 J 51,000 J --9,800 J --10,000 J --24,000 J --24,000 J --<300 UJ --<300 UJ --4,700 J --4,600 J 17,000 J 25,000 J 16,000 J 24,000 J --6,700 J --6,900 J --70,000 J --74,000 J --240 J --240 J --3,300 J --3,700 J --<230 UJ --<230 UJ 49,000 J 50,000 J 51,000 J 54,000 J 6,100 J 6,900 J 6,100 J 7,100 J --<190 UJ --<190 UJ --<300 UJ --<300 UJ --<170 UJ --<170 UJ --<550 UJ --<550 UJ 530,000 540,000 61,000 J --55,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 6 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-12 SEEP-A-12 SEEP-A-2 SEEP-A-2 FAY-SW-SEEP-A-12-020719 FAY-SW-SEEP-A-12-020719 FAY-SW-SEEP-A-2-020719 FAY-SW-SEEP-A-2-020719 9982640 / 9982637 320-51045-24 9982600 / 9982597 320-51045-14 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 7,400 J 8,700 J 6,900 J 8,900 J <50 UJ <41 UJ <50 UJ <41 UJ 15,000 J 16,000 J 68,000 J 82,000 J 30,000 J 30,000 J 36,000 J 40,000 J 4,800 J 5,200 J 14,000 J 14,000 J 4,200 J 4,600 J 7,200 J 7,600 J 20,000 J 22,000 J 19,000 J 23,000 J --310 J --1,800 J --39 J --830 J --<60 UJ --<60 UJ --890 J --1,200 J 2,500 J 4,100 J 4,600 J 5,900 J --2,100 J --2,200 J --490 J --23,000 J --26 J --47 J --570 J --1,000 J --<46 UJ --<46 UJ 98 J 120 J 4,100 J 3,800 J 1,300 J 1,400 J 990 J 1,200 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 120,000 240,000 20,000 J --27,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 7 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-3 SEEP-A-3 SEEP-A-4 SEEP-A-4 FAY-SW-SEEP-A-3-020719 FAY-SW-SEEP-A-3-020719 FAY-SW-SEEP-A-4-020719 FAY-SW-SEEP-A-4-020719 9982601 / 9982604 320-51045-15 9982608 / 9982605 320-51045-16 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 6,700 J 8,400 J 9,300 J 12,000 J <50 UJ <41 UJ <50 UJ <41 UJ 69,000 J 79,000 J 42,000 J 49,000 J 36,000 J 38,000 J 27,000 J 28,000 J 14,000 J 13,000 J 8,100 J 8,100 J 7,300 J 7,700 J 4,100 J 4,300 J 18,000 J 22,000 J 23,000 J 28,000 J --1,600 J --860 J --930 J --240 J --<60 UJ --<60 UJ --1,200 J --770 J 4,800 J 5,500 J 3,600 J 4,300 J --2,200 J --1,300 J --23,000 J --6,500 J --45 J --26 J --910 J --640 J --<46 UJ --<46 UJ 4,500 J 3,700 J 700 J 560 J 1,000 J 1,100 J 770 J 830 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 220,000 160,000 13,000 J --17,000 J -- 250 ------ <1.8 ------ <1.8 ------ 92 ------ 19 ------ 35 ------ 39 ------ 550 ------ <0.9 ------ <0.9 ------ <1.8 ------ 1.6 J ------ <1.8 ------ <1.8 ------ 3 ------ <1.8 ------ 5.6 ------ <1.8 ------ <2.7 ------ <2.7 ------ <1.8 ------ <5.4 ------ <2.7 ------ <8.1 UJ ------ <2.7 UJ ------ <2.7 ------ <8.1 UJ ------ <2.7 UJ ------ <0.9 ------ <0.9 ------ <1.8 ------ 3 ------ <0.9 UJ ------ <0.9 UJ ------ <1.8 UJ ------ February 2019 Page 8 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-5 SEEP-A-5 SEEP-A-6 SEEP-A-6 FAY-SW-SEEP-A-5-020719 FAY-SW-SEEP-A-5-020719 FAY-SW-SEEP-A-6-020719 FAY-SW-SEEP-A-6-020719 9982612 / 9982609 320-51045-17 9982616 / 9982613 320-51045-18 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 15,000 J 20,000 J 14,000 J 18,000 J <50 UJ <41 UJ <50 UJ <41 UJ 25,000 J 30,000 J 15,000 J 17,000 J 23,000 J 28,000 J 18,000 J 20,000 J 8,000 J 8,500 J 6,000 J 6,000 J 5,600 J 6,300 J 5,000 J 5,700 J 31,000 J 42,000 J 29,000 J 38,000 J --1,300 J --1,000 J --520 J --670 J --<60 UJ --<60 UJ --1,200 J --870 J 3,800 J 4,500 J 3,800 J 4,700 J --2,000 J --1,400 J --9,900 J --6,900 J --40 J --31 J --610 J --380 J --<46 UJ --<46 UJ 1,300 J 1,100 J 1,500 J 1,500 J 1,100 J 1,200 J 1,200 J 1,300 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 180,000 140,000 18,000 J --18,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 9 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-7 SEEP-A-7 SEEP-A-8 SEEP-A-8 FAY-SW-SEEP-A-7-020719 FAY-SW-SEEP-A-7-020719 FAY-SW-SEEP-A-8-020719 FAY-SW-SEEP-A-8-020719 9982620 / 9982617 320-51045-19 9982624 / 9982621 320-51045-20 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 17,000 J 22,000 J 15,000 J 19,000 J <50 UJ <41 UJ <50 UJ <41 UJ 41,000 J 43,000 J 17,000 J 17,000 J 31,000 J 35,000 J 18,000 J 20,000 J 9,800 J 11,000 J 5,800 J 6,300 J 6,200 J 8,000 J 5,300 J 6,700 J 39,000 J 46,000 J 34,000 J 38,000 J --1,800 J --1,300 J --560 J --540 J --<60 UJ --<60 UJ --1,500 J --800 J 4,200 J 5,700 J 4,200 J 6,200 J --2,500 J --1,500 J --13,000 J --6,000 J --51 J --37 J --880 J --380 J --<46 UJ --<46 UJ 990 J 1,300 J 2,800 J 1,600 J 1,300 J 1,400 J 1,400 J 1,500 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 220,000 140,000 28,000 J --13,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 10 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-9 SEEP-A-9 SEEP-B-1 SEEP-B-1 FAY-SW-SEEP-A-9-020719 FAY-SW-SEEP-A-9-020719 FAY-SW-SEEP-B-1-020519 FAY-SW-SEEP-B-1-020519 9982628 / 9982625 320-51045-21 9980817 320-51045-1 2/7/2019 2/7/2019 2/5/2019 2/5/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 18,000 J 22,000 J 15,000 J 17,000 J <50 UJ <41 UJ <50 UJ <41 UJ 73,000 J 75,000 J 150,000 J 148,000 J 58,000 J 63,000 J 43,000 J 43,000 J 24,000 J 24,000 J 11,000 J 9,200 J 19,000 J 21,000 J 2,000 J 1,800 J 47,000 J 50,000 J 38,000 J 42,000 J --8,300 J --2,800 J --22,000 J --6,100 J --<60 UJ --<60 UJ --5,100 J --3,200 J 15,000 J 17,000 J 460 J 530 J --8,200 J --4,700 J --84,000 J --38,000 J --200 J --84 J --3,000 J --3,300 J --<46 UJ --<46 UJ 46,000 J 43,000 J 4,600 J 3,500 J 5,600 J 6,000 J 1,100 J 1,100 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 510,000 350,000 57,000 J --24,000 J -- ----560 -- ----<18 -- ----<18 -- ----170 -- ----18 -- ----31 -- ----47 -- ----1,600 -- ----<9 -- ----<9 -- ----<18 -- ----<9 -- ----<18 -- ----<18 -- ----<18 -- ----<18 -- ----<18 -- ----<18 -- ----<27 -- ----<27 -- ----<18 -- ----<54 -- ----<27 -- ----<81 -- ----<27 -- ----<27 -- ----<81 -- ----<27 -- ----<9 -- ----<9 -- ----<18 -- ----<27 -- ----<9 -- ----<9 -- ----<18 -- February 2019 Page 11 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-B-2 SEEP-B-2 SEEP-B-3 SEEP-B-3 FAY-SW-SEEP-B-2-020519 FAY-SW-SEEP-B-2-020519 FAY-SW-SEEP-B-3-020619 FAY-SW-SEEP-B-3-020619 9980824 / 9980821 320-51045-2 9981743 / 9981740 320-51045-3 2/5/2019 2/5/2019 2/6/2019 2/6/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 34,000 J 32,000 J 35,000 J 38,000 J <50 UJ <41 UJ <50 UJ <41 UJ 9,200 J 8,000 J 5,000 J 5,100 J 19,000 J 16,000 J 17,000 J 16,000 J 4,500 J 3,400 J 3,800 J 3,300 J 2,800 J 2,400 J 2,700 J 2,500 J 66,000 J 61,000 J 66,000 J 72,000 J --7,100 J --9,100 J --24,000 J --34,000 J -- <60 UJ -- <60 UJ --9,600 J --13,000 J 1,300 J 1,300 J 1,700 J 1,500 J --11,000 J --14,000 J --77,000 J --99,000 J --230 J --280 J --6,300 J --7,800 J -- <46 UJ -- <46 UJ 19,000 J 14,000 J 23,000 J 22,000 J 3,200 J 3,000 J 3,500 J 3,900 J -- <37 UJ -- <37 UJ -- <60 UJ -- <60 UJ -- <35 UJ -- <35 UJ -- <110 UJ -- <110 UJ 310,000 380,000 38,000 J --40,000 J -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- February 2019 Page 12 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-B-3-A1 SEEP-B-3-A1 SEEP-B-3-E4 SEEP-B-3-E4 FAY-SW-SEEP-B-3-A1-020619 FAY-SW-SEEP-B-3-A1-020619 FAY-SW-SEEP-B-3-E4-020619 FAY-SW-SEEP-B-3-E4-020619 9981747 / 9981744 320-51045-7 9981751 / 9981748 320-51045-8 2/6/2019 2/6/2019 2/6/2019 2/6/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 36,000 J 42,000 J 4,800 J 6,500 J <50 UJ <41 UJ <50 UJ <41 UJ 4,800 J 5,600 J 1,600 J 1,800 J 18,000 J 17,000 J 5,400 J 5,900 J 3,700 J 3,200 J 980 J 1,000 J 2,900 J 2,800 J 990 J 1,200 J 70,000 J 79,000 J 13,000 J 16,000 J --11,000 J --120 J --46,000 J --<24 UJ --<60 UJ --<60 UJ --13,000 J --640 J 1,900 J 1,900 J 390 J 610 J --16,000 J --730 J --119,000 J --150 J --340 J --<15 UJ --8,500 J --75 J --<46 UJ --<46 UJ 31,000 J 30,000 J <50 UJ <27 UJ 4,100 J 4,700 J 250 J 300 J --37 J --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 460,000 45,000 58,000 J --10,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 13 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-B-4 SEEP-B-4 SEEP-B-4-A3 SEEP-B-4-A3 FAY-SW-SEEP-B-4-020619 FAY-SW-SEEP-B-4-020619 FAY-SW-SEEP-B-4-A3-020619 FAY-SW-SEEP-B-4-A3-020619 9981755 / 9981752 320-51045-9 9981759 / 9981756 320-51045-10 2/6/2019 2/6/2019 2/6/2019 2/6/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 60,000 J 61,000 J 33,000 J 36,000 J <50 UJ <41 UJ <50 UJ <41 UJ 6,700 J 6,800 J 4,900 J 5,200 J 24,000 J 22,000 J 18,000 J 17,000 J 5,000 J 4,100 J 4,900 J 4,000 J 3,800 J 3,400 J 3,700 J 3,200 J 120,000 J 111,000 J 66,000 J 71,000 J --16,000 J --9,100 J --75,000 J --64,000 J --<60 UJ --<60 UJ --21,000 J --16,000 J 2,600 J 2,500 J 2,800 J 2,600 J --24,000 J --18,000 J --171,000 J --96,000 J --500 J --290 J --13,000 J --6,300 J --<46 UJ --<46 UJ 69,000 J 51,000 J 42,000 J 40,000 J 6,200 J 6,800 J 4,000 J 4,400 J --<37 UJ --<37 UJ --<60 UJ --<60 UJ --<35 UJ --<35 UJ --<110 UJ --<110 UJ 670,000 430,000 82,000 J --32,000 J -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- February 2019 Page 14 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-C-1 SEEP-C-1 SEEP-C-1-E2 SEEP-C-1-E2 FAY-SW-SEEP-C-1-020519 FAY-SW-SEEP-C-1-020519 FAY-SW-SEEP-C-1-E2-020519 FAY-SW-SEEP-C-1-E2-020519 9980825 / 9980829 320-51045-4 9980836 / 9980833 320-51045-5 2/5/2019 2/5/2019 2/5/2019 2/5/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento -------- 4,700 J 5,100 J 4,600 J 4,400 J <50 UJ <82 UJ <50 UJ <41 UJ 200,000 J 196,000 J 180,000 J 164,000 J 62,000 J 64,000 J 46,000 J 40,000 J 21,000 J 20,000 J 13,000 J 9,600 J 4,500 J 4,600 J 2,600 J 2,200 J 16,000 J 16,000 J 14,000 J 12,000 J --2,300 J --580 J --<49 UJ --<24 UJ -- <120 UJ -- <60 UJ --1,900 J --990 J <100 UJ 89 J <100 UJ 92 J --1,600 J --1,200 J --3,000 J --1,500 J -- <31 UJ --17 J --2,000 J --1,600 J -- <92 UJ -- <46 UJ <50 UJ <53 UJ <50 UJ <27 UJ 590 J 590 J 260 J 250 J --<75 UJ --<37 UJ --<120 UJ --<60 UJ --<69 UJ --<35 UJ --<220 UJ --<110 UJ 340,000 260,000 27,000 J --17,000 J -- 380 ------ <18 ------ <18 ------ 220 ------ <17 ------ 20 ------ 81 ------ 1,700 ------ <9.1 ------ <9.1 ------ <18 ------ <9.1 ------ <18 ------ <18 ------ <18 ------ <18 ------ <18 ------ <18 ------ <27 ------ <27 ------ <18 ------ <54 ------ <27 ------ <82 ------ <27 ------ <27 ------ <82 ------ <27 ------ <9.1 ------ <8.7 ------ <18 ------ <27 ------ <9.1 ------ <9.1 ------ <18 ------ February 2019 Page 15 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. WC-1 WC-1 WC-2 WC-3 FAY-SW-WC-1-020719 FAY-SW-WC-1-020719 FAY-SW-WC-2-020719 FAY-SW-WC-3-020719 9982641 320-51045-25 9982648 / 9982645 9982649 / 9982652 2/7/2019 2/7/2019 2/7/2019 2/7/2019 -------- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster Eurofins Lancaster -------- 130 J 190 J 64 <50 <50 UJ <41 UJ <50 <50 490 J <210 UJ 56 59 310 J 330 J 140 110 52 J 58 J <50 <50 <50 UJ <79 UJ <50 <50 440 J 1,200 J 290 270 --<28 UJ ---- --<24 UJ ---- --<60 UJ ---- --<70 UJ ---- <100 UJ 34 J <100 <100 --<160 UJ ---- --91 J ---- --<15 UJ ---- --<54 UJ ---- --<46 UJ ---- <50 UJ <27 UJ <50 <50 <50 UJ <30 UJ <50 <50 --<37 UJ ---- --<60 UJ ---- --<35 UJ ---- --<110 UJ ---- 2,200 680 560 290 J --130 J 120 J 5.4 ----<5.1 <1.7 ----<1.7 <1.7 ----<1.7 1.8 ----1.5 <1.7 ----<1.7 4.7 ----2.5 2.5 ----2.2 6.7 ----<5.1 <0.85 ----<0.86 <0.85 ----<0.86 <1.7 ----<1.7 3.1 ----3.1 <1.7 ----<1.7 <1.7 ----<1.7 <1.7 ----<1.7 <1.7 ----<1.7 2.3 ----2.1 <1.7 ----<1.7 <2.6 ----<2.6 <2.6 ----<2.6 <1.7 ----<1.7 <5.1 ----<5.1 <2.6 ----<2.6 <7.7 UJ ----<7.7 UJ <2.6 UJ ----<2.6 UJ <2.6 ----<2.6 <7.7 UJ ----<7.7 UJ <2.6 UJ ----<2.6 UJ <0.85 ----<0.86 <0.85 ----<0.86 <1.7 ----<1.7 <2.6 ----<2.6 <0.85 UJ ----<0.86 UJ <0.85 UJ ----<0.86 UJ <1.7 UJ ----<1.7 UJ February 2019 Page 16 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. WC-4 WC-5 CFR-MILE-76 CFR-MILE-76 FAY-SW-WC-4-020719 FAY-SW-WC-5-020719 FAY-SW-CFR-RM-76-020219 FAY-SW-CFR-RM-76-020419 9982656 / 9982653 9982660 / 9982657 9979948 / 9979951 320-51024-3 2/7/2019 2/7/2019 2/4/2019 2/4/2019 -------- Eurofins Lancaster Eurofins Lancaster Eurofins Lancaster TestAmerica Sacramento -------- <50 74 <50 <20 UJ <50 <50 <50 <2 UJ <50 <50 <50 <5 UJ 82 74 <50 2 J <50 <50 <50 <2 UJ <50 <50 <50 <2 UJ 210 190 <50 11 J ------<2 UJ ------<2 UJ ------<2 UJ ------<2 UJ <100 <100 <100 <2 UJ ------<2 UJ ------<2 UJ ------<2 UJ ------2.2 J ------<2 UJ <50 <50 <50 <2 UJ <50 <50 <50 <2 UJ ------<2 UJ ------<2 UJ ------<2 UJ ------<2 UJ 340 370 18 51 J 33 J 2.9 J -- ----<5.2 -- ----<1.7 -- ----<1.7 -- ----3.7 -- ----<1.7 -- ----6.1 -- ----5.7 -- ----<5.2 -- ----<0.87 -- ----<0.87 -- ----<1.7 -- ----2 J -- ----<1.7 -- ----<1.7 -- ----3.5 -- ----<1.7 -- ----7.8 -- ----<1.7 -- ----<2.6 -- ----<2.6 -- ----<1.7 -- ----<5.2 -- ----<2.6 -- ----<7.9 UJ -- ----<2.6 -- ----<2.6 -- ----<7.9 UJ -- ----<2.6 -- ----<0.87 -- ----<0.87 -- ----<1.7 -- ----<2.6 -- ----<0.87 UJ -- ----<0.87 UJ -- ----<1.7 UJ -- February 2019 Page 17 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. CFR-MILE-84 CFR-MILE-84 EQBLK EQBLK FBLK FAY-SW-CFR-RM-84-020219 FAY-SW-CFR-RM-84-020419 EB-020419 EB-020419 FB-020119 9979952 320-51024-4 9979956 320-51024-5 9978967 2/4/2019 2/4/2019 2/4/2019 2/4/2019 2/1/2019 ----Field Blank Field Blank Field Blank Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster ---------- 50 <20 UJ <50 UJ <20 UJ <50 UJ <50 <2 UJ <50 UJ <2 UJ <50 UJ 56 55 J <50 UJ <5 UJ <50 UJ <50 17 J <50 UJ <2 UJ <50 UJ <50 3.6 J <50 UJ <2 UJ <50 UJ <50 <2 UJ <50 UJ <2 UJ <50 UJ <50 31 J <50 UJ <10 UJ <50 UJ --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- <100 <2 UJ <100 UJ <2 UJ <100 UJ --8.3 J --<2 UJ -- --14 J --<2 UJ -- --<2 UJ --<2 UJ -- --2.9 J --<2 UJ -- --<2 UJ --<2 UJ -- <50 <2 UJ <50 UJ <2 UJ <50 UJ <50 <2 UJ <50 UJ <2 UJ <50 UJ --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- --<2 UJ --<2 UJ -- 140 ND 13 --<1.8 --<1.8 <5.3 --<5.4 --<5.4 <1.8 --<1.8 --<1.8 <1.8 --<1.8 --<1.8 3.5 --<0.91 --<0.9 <1.8 --<1.8 --<1.8 5.7 --<0.91 --<0.9 5.6 --<1.8 --<1.8 5.8 --<5.4 --<5.4 <0.89 --<0.91 --<0.9 <0.89 --<0.91 --<0.9 <1.8 --<1.8 --<1.8 2.2 J --<0.91 --<0.9 <1.8 --<1.8 --<1.8 <1.8 --<1.8 --<1.8 3.3 --<1.8 --<1.8 <1.8 --<1.8 --<1.8 8.4 --<1.8 --<1.8 <1.8 --<1.8 --<1.8 <2.7 --<2.7 --<2.7 <2.7 --<2.7 --<2.7 <1.8 --<1.8 --<1.8 <5.3 --<5.4 --<5.4 <2.7 --<2.7 --<2.7 <8 UJ --<8.2 --<8.1 <2.7 --<2.7 --<2.7 <2.7 --<2.7 --<2.7 <8 UJ --<8.2 --<8.1 <2.7 --<2.7 --<2.7 <0.89 --<0.91 --<0.9 <0.89 --<0.91 --<0.9 <1.8 --<1.8 --<1.8 <2.7 --<2.7 --<2.7 <0.89 --<0.91 --<0.9 <0.89 --<0.91 --<0.9 <1.8 --<1.8 --<1.8 February 2019 Page 18 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. FBLK FBLK FBLK FBLK FBLK FB-020119 FB-020219 FB-020219 FB-S-020519 FB-020519 320-51031-9 9979939 / 9979936 320-51031-6 9980837 320-51045-11 2/1/2019 2/2/2019 2/2/2019 2/5/2019 2/5/2019 Field Blank Field Blank Field Blank Field Blank Field Blank TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento ---------- <47 UJ <50 UJ <47 UJ <50 <47 UJ <41 UJ <50 UJ <41 UJ <50 <41 UJ <210 UJ <50 UJ <210 UJ <50 <210 UJ <81 UJ <50 UJ <81 UJ <50 <81 UJ <58 UJ <50 UJ <58 UJ <50 <58 UJ <79 UJ <50 UJ <79 UJ <50 <79 UJ <570 UJ <50 UJ <570 UJ <50 <570 UJ <28 UJ --<28 UJ --<28 UJ <24 UJ --<24 UJ --<24 UJ <60 UJ --<60 UJ --<60 UJ <70 UJ --<70 UJ --<70 UJ 370 J <100 UJ <34 UJ <100 <34 UJ <160 UJ --<160 UJ --<160 UJ <58 UJ --<58 UJ --58 J <15 UJ --<15 UJ --<15 UJ <54 UJ --<54 UJ --<54 UJ <46 UJ --<46 UJ --<46 UJ <27 UJ <50 UJ <27 UJ <50 <27 UJ <30 UJ <50 UJ <30 UJ <50 <30 UJ <37 UJ --<37 UJ --<37 UJ <60 UJ --<60 UJ --<60 UJ <35 UJ --<35 UJ --<35 UJ <110 UJ --<110 UJ --<110 UJ 370 ND 58 --<1.8 --<1.8 UJ -- ------<5.3 -- ------<1.8 -- ------<1.8 -- ------<0.88 -- ------<1.8 -- ------<0.88 -- ------<1.8 -- ------<5.3 -- ------<0.88 -- ------<0.88 -- ------<1.8 -- ------<0.88 -- ------<1.8 -- ------<1.8 -- ------<1.8 -- ------<1.8 -- ------<1.8 -- ------<1.8 -- ------<2.6 -- ------<2.6 -- ------<1.8 -- ------<5.3 -- ------<2.6 -- ------<7.9 -- ------<2.6 -- ------<2.6 -- ------<7.9 -- ------<2.6 -- ------<0.88 -- ------<0.88 -- ------<1.8 -- ------<2.6 -- ------<0.88 -- ------<0.88 -- ------<1.8 -- February 2019 Page 19 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. FBLK FBLK FBLK OLDOF-2 SEEP-A-1 FB-020619 FB-020619 FB-020719 FAY-SW-OLDOF-2-052419 FAY-SW-SEEPA-1-052019 9981763 / 9981760 320-51045-12 9982661 / 9982664 280-124472-2 280-124212-1 2/6/2019 2/6/2019 2/7/2019 5/24/2019 5/20/2019 Field Blank Field Blank Field Blank ---- Eurofins Lancaster TestAmerica Sacramento Eurofins Lancaster TestAmerica Sacramento TestAmerica Sacramento ---------- <50 UJ <47 UJ <50 1,900 11,000 <50 UJ <41 UJ <50 <41 <41 <50 UJ <210 UJ <50 71,000 103,000 J <50 UJ <81 UJ <50 18,000 47,000 <50 UJ <58 UJ <50 4,800 18,000 <50 UJ <79 UJ <50 1,600 11,000 <50 UJ <570 UJ <50 5,600 24,000 J --<28 UJ --200 2,500 --<24 UJ --<24 1,600 --<60 UJ --<60 <60 --<70 UJ --170 J 1,600 <100 UJ <34 UJ <100 620 7,100 --<160 UJ --410 3,000 --<58 UJ --790 31,000 --<15 UJ --<15 67 --<54 UJ --830 1,400 --<46 UJ --<46 <46 <50 UJ <27 UJ <50 <27 7,400 <50 UJ <30 UJ <50 310 1,800 --<37 UJ --<37 <37 UJ --<60 UJ --<60 <60 --<35 UJ --<35 <35 UJ --<110 UJ --<110 <110 ND 2 110,000 300,000 <1.8 UJ --2.2 J 6,700 J 24,000 J ----<5.4 86 360 ----<1.8 <2 <2 ----<1.8 <2 <2 ----<0.9 25 120 ----<1.8 7.5 28 ----<0.9 32 39 ----<1.8 17 50 ----<5.4 150 690 ----<0.9 <2 <2 ----<0.9 <2 <2 ----<1.8 <2 <2 ----<0.9 <2 <2 ----<1.8 <2 <2 ----<1.8 <2 <2 ----<1.8 <2 3.3 ----<1.8 <2 <2 ----<1.8 2 5.7 ----<1.8 <2 <2 ----<2.7 <2 <2 ----<2.7 UJ <20 <20 ----<1.8 <20 <20 ----<5.4 <20 <20 ----<2.7 <20 <20 ----<8.1 ---- ----<2.7 ---- ----<2.7 <20 <20 ----<8.1 ---- ----<2.7 ---- ----<0.9 <2 <2 ----<0.9 <2 <2 ----<1.8 <2 <2 ----<2.7 <2 <2 ----<0.9 ---- ----<0.9 ---- ----<1.8 ---- February 2019 May 2019 Page 20 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-1 SEEP-A-10 SEEP-A-3 SEEP-A-4 FAY-SW-SEEPA-1-052019-D FAY-SW-SEEPA-10-052019 FAY-SW-SEEPA-3-052119 FAY-SW-SEEPA-4-052119 280-124212-2 280-124212-3 280-124212-14 280-124212-8 5/20/2019 5/20/2019 5/21/2019 5/21/2019 Field Duplicate ------ TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento ----41,000 -- 11,000 29,000 12,000 11,000 <41 <41 <41 <41 103,000 26,000 118,000 J 45,000 48,000 36,000 57,000 26,000 18,000 14,000 J 22,000 7,400 11,000 13,000 11,000 3,300 25,000 J 61,000 J 31,000 25,000 2,500 6,800 2,800 710 1,700 12,000 2,100 76 <60 <60 <60 <60 1,600 5,100 J 1,800 J 770 6,200 12,000 7,900 1,800 3,000 7,900 J 3,900 J 1,300 32,000 71,000 J 37,000 J 5,500 74 150 79 25 1,400 2,000 1,800 680 <46 <46 <46 <46 7,400 27,000 9,000 260 1,700 3,600 1,900 650 <37 UJ <37 UJ <37 UJ <37 UJ <60 <60 <60 <60 <35 <35 UJ <35 UJ <35 UJ <110 <110 <110 <110 300,000 370,000 320,000 150,000 30,000 J 48,000 J --20,000 J 360 690 --330 <2 11 --<2 <2 <2 --<2 120 180 --71 26 75 --11 37 79 --31 52 55 --25 750 930 --450 <2 <2 --<2 <2 <2 --<2 <2 9.8 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 3.3 <2 --<2 <2 <2 --<2 5.5 9.5 --4.5 <2 <2 --<2 <2 <2 --<2 <20 <20 --<20 <20 <20 --<20 <20 <20 --<20 <20 <20 --<20 -------- -------- <20 <20 --<20 -------- -------- <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 -------- -------- -------- May 2019 Page 21 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-5 SEEP-A-5-B-1 SEEP-A-5-B-1 SEEP-A-5-D1-2 FAY-SW-SEEPA-5-052119 FAY-SW-SEEPA-5-B-1-052119 FAY-SW-SEEPA-5-B-1-052119-D FAY-SW-SEEPA-5-D1-2-052119 280-124212-9 280-124212-5 280-124212-6 280-124212-4 5/21/2019 5/21/2019 5/21/2019 5/21/2019 ----Field Duplicate -- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento -------- 20,000 <47 <47 6,800 <41 <41 <41 <41 25,000 <210 <210 6,800 24,000 <81 <81 16,000 7,000 J <58 <58 2,800 5,300 <79 <79 1,800 38,000 J <570 <570 17,000 1,200 <28 <28 100 740 <24 <24 <24 <60 <60 <60 <60 1,000 J <70 <70 260 4,200 <34 <34 360 B 1,600 J <160 <160 480 6,300 J <58 <58 <58 37 <15 <15 <15 550 <54 <54 120 <46 <46 <46 <46 1,800 <27 <27 <27 1,400 <30 <30 330 <37 UJ <37 UJ <37 UJ <37 UJ <60 <60 <60 <60 <35 UJ <35 UJ <35 UJ <35 UJ <110 <110 <110 <110 170,000 42 38 65,000 29,000 J 42 J 38 J 12,000 J 620 6.2 6.4 120 <2 <2 <2 <2 <2 <2 <2 <2 82 8.6 8.6 37 25 <2 <2 3 53 9 8.7 60 32 13 13 14 530 12 13 190 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 3.2 3.3 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 4.9 5 <2 <2 <2 <2 <2 4.6 11 11 2.3 <2 <2 <2 <2 <2 <2 <2 <2 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 -------- -------- <20 <20 <20 <20 -------- -------- <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 UJ <2 <2 <2 <2 <2 <2 -------- -------- -------- May 2019 Page 22 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-A-TR1 SEEP-A-TR2-1 SEEP-A-TR3-1 SEEP-A-TR4-1 FAY-SW-SEEPA-TR1-052119 FAY-SW-SEEP-A-TR2-1-052119 FAY-SW-SEEP-A-TR3-1-052119 FAY-SW-SEEP-A-TR4-1-052119 280-124212-7 280-124222-3 280-124222-1 280-124222-4 5/21/2019 5/21/2019 5/21/2019 5/21/2019 -------- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento -------- 6,600 6,800 8,800 5,700 <41 <41 <41 <41 24,000 24,000 30,000 5,000 20,000 21,000 27,000 14,000 5,100 5,500 5,500 2,200 1,900 1,900 1,500 1,300 16,000 19,000 25,000 16,000 220 240 130 91 <24 <24 <24 <24 <60 <60 <60 <60 510 570 J 600 J 260 J 230 B 220 170 320 860 960 J 1,100 J 540 J 980 1,200 J 980 J <58 <15 15 <15 <15 280 J 360 370 120 <46 <46 <46 <46 <27 <27 <27 <27 250 290 260 310 <37 UJ <37 UJ <37 UJ <37 UJ <60 <60 <60 <60 <35 UJ <35 UJ <35 UJ <35 UJ <110 <110 <110 <110 89,000 82,000 100,000 46,000 12,000 J ------ 150 140 160 97 <2 <2 <2 <2 <2 <2 <2 <2 45 41 39 32 2.9 2 <2 2.5 26 25 24 56 17 ------ 250 270 310 170 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 2.2 2 <2 <2 <2 <2 <2 <2 8.8 6.1 <2 3.1 I <2 <2 <2 <2 <2 <2 <2 <2 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 -------- -------- <20 <20 <20 <20 -------- -------- <2 <2 <2 <2 <2 ------ <2 <2 <2 <2 <2 <2 <2 <2 -------- -------- -------- May 2019 Page 23 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-B-1 SEEP-B-2 SEEP-B-3-A SEEP-B-TR1 FAY-SW-SEEP-B-1-052119 FAY-SW-SEEP-B-2 -052119 FAY-SW-SEEP-B-3A-052119 FAY-SW-SEEPB-TR1- 052119 280-124257-1 280-124257-2 280-124257-5 280-124257-3 5/21/2019 5/21/2019 5/21/2019 5/21/2019 -------- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento --75,000 150,000 17,000 13,000 46,000 99,000 13,000 <41 <41 <200 <41 150,000 11,000 J 6,600 38,000 J 43,000 17,000 22,000 19,000 9,600 4,100 4,900 4,700 1,300 2,500 3,800 1,500 34,000 81,000 166,000 30,000 1,700 8,300 19,000 110 2,900 22,000 89,000 <24 <60 <60 <300 <60 2,000 J 9,000 19,000 J 500 J 210 1,300 2,800 130 2,900 J 11,000 22,000 J 880 J 21,000 J 56,000 J 113,000 1,200 J 53 250 J 610 <15 2,700 6,600 15,000 430 <46 <46 <230 <46 2,000 15,000 58,000 J <27 660 3,300 7,700 170 <37 <37 <190 <37 <60 <60 <300 <60 <35 <35 <170 <35 <110 <110 <550 <110 310,000 290,000 650,000 110,000 22,000 J ------ 470 ------ 2.2 ------ <2 ------ 140 ------ 12 ------ 17 ------ 37 ------ 1,200 ------ <2 ------ <2 ------ <2 ------ <2 ------ <2 ------ <2 ------ <2 ------ <2 ------ 2.3 ------ <2 ------ <2 ------ <20 ------ <20 ------ <20 ------ <20 ------ -------- -------- <20 ------ -------- -------- <2 ------ <2 ------ <2 ------ <2 ------ -------- -------- -------- May 2019 Page 24 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. SEEP-B-TR2 SEEP-C-1 SEEP-D-1 SEEP-D-1 FAY-SW-SEEPB-TR2- 052119 FAY-SW-SEEP-C-1-052319 FAY-SW-SEEP-D-1-053019 FAY-SW-SEEP-D-1-053019-D 280-124257-4 280-124325-4 280-124599-1 280-124599-2 5/21/2019 5/23/2019 5/30/2019 5/30/2019 ------Field Duplicate TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento 42,000 ------ 22,000 5,000 2,900 J 3,000 J <41 <61 <41 UJ <41 UJ 82,000 193,000 91,000 J 91,000 J 28,000 66,000 29,000 J 29,000 J 5,400 19,000 7,900 J 8,100 J 1,400 4,900 2,300 J 2,500 J 44,000 14,000 9,200 J 9,000 J 4,600 2,500 1,300 J 1,300 J 2,500 <36 <24 UJ <24 UJ <60 <90 <60 UJ <60 UJ 5,700 1,200 1,100 J 1,100 J 440 97 J 150 B 150 B 6,400 J 1,300 970 J 1,000 J 34,000 J 1,900 2,600 J 2,500 J 130 52 J 15 J <15 UJ 4,900 2,000 810 J 800 J <46 <69 <46 UJ <46 UJ 2,700 <40 <27 UJ <27 UJ 1,700 720 320 J 340 J <37 <56 <37 UJ <37 UJ <60 <90 <60 UJ <60 UJ <35 <52 <35 UJ <35 UJ <110 <160 <110 UJ <110 UJ 250,000 350,000 170,000 160,000 --36,000 J 19,000 J 15,000 J --390 210 210 --<2 <2 <2 --<2 <2 <2 --240 97 93 --<2 2.7 2.6 --18 12 11 --92 40 41 --1,800 760 730 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --2.2 2 2 --<2 <2 <2 --2.2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<20 <20 <20 --<20 <20 <20 --<20 <20 <20 --<20 <20 <20 -------- -------- --<20 <20 <20 -------- -------- --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 --<2 <2 <2 -------- -------- -------- May 2019 Page 25 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. WC-1 WC-1-TR1 WC-1-TR2 WC-3-TR2 FAY-SW-WC-1-053019 FAY-SW-WC-1-TR1-052119 FAY-SW-WC-1-TR2-052219 FAY-SW-WC-3-TR2-052319 280-124599-3 280-124212-10 280-124323-2 280-124323-3 5/30/2019 5/21/2019 5/22/2019 5/23/2019 -------- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento ----3,900 11,000 240 J <47 720 2,800 <41 UJ <41 <41 <41 1,400 J <210 1,300 2,100 730 J <81 2,000 6,500 120 J <58 380 1,000 <79 UJ <79 200 520 1,200 J <570 2,400 8,300 <28 UJ <28 <28 30 <24 UJ <24 <24 <24 <60 UJ <60 <60 <60 <70 UJ <70 <70 <70 45 B <34 <34 <34 <160 UJ <160 <160 <160 220 J <58 <58 UJ <58 UJ <15 UJ <15 <15 <15 <54 UJ <54 <54 <54 <46 UJ <46 <46 <46 <27 UJ <27 <27 <27 <30 UJ <30 59 93 <37 UJ <37 UJ <37 <37 <60 UJ <60 <60 <60 <35 UJ <35 UJ <35 <35 <110 UJ <110 <110 <110 4,800 62 7,100 21,000 810 J 62 J ---- 10 6 ---- <2 <2 ---- <2 <2 ---- 2.6 8.1 ---- <2 <2 ---- 8.8 7.4 ---- 4.6 12 ---- 12 12 ---- <2 <2 ---- <2 <2 ---- <2 <2 ---- 3.6 3.3 ---- <2 <2 ---- <2 <2 ---- 2.2 4.5 ---- <2 <2 ---- 4.2 11 ---- <2 <2 ---- <2 <2 ---- <20 <20 ---- <20 <20 ---- <20 <20 ---- <20 <20 ---- -------- -------- <20 <20 ---- -------- -------- <2 <2 ---- <2 <2 ---- <2 <2 ---- <2 <2 ---- -------- -------- -------- May 2019 Page 26 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. WC-3-TR3 WC-4-TR1 GBC-1 GBC-2 FAY-SW-WC-3-TR3-052319 FAY-SW-WC-4-TR1-052219 FAY-SW-GBC-1-052919 FAY-SW-GBC-2-052919 280-124323-4 280-124323-5 280-124472-4 280-124472-5 5/23/2019 5/22/2019 5/29/2019 5/29/2019 -------- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento 2,400 1,700 --640 510 370 300 J 280 <41 <41 <41 <41 350 520 <210 <210 1,300 1,100 420 J 370 260 210 <58 65 85 <79 <79 <79 1,700 1,300 1,300 J 1,200 <28 <28 <28 <28 <24 <24 <24 <24 <60 <60 <60 <60 <70 <70 <70 <70 UJ <34 <34 <34 <34 <160 <160 <160 <160 <58 UJ <58 UJ <58 <58 <15 <15 <15 <15 <54 <54 <54 <54 <46 <46 <46 <46 <27 <27 <27 <27 40 <30 33 30 <37 <37 <37 <37 <60 <60 <60 <60 <35 <35 <35 <35 <110 <110 <110 <110 4,200 3,500 2,600 1,900 ----500 J -- ----11 -- ----<2 -- ----<2 -- ----2.4 -- ----<2 -- ----3.8 -- ----3.3 -- ----10 -- ----<2 -- ----<2 -- ----<2 -- ----<2 -- ----<2 -- ----<2 -- ----<2 -- ----<2 -- ----2.4 -- ----<2 -- ----<2 -- ----<20 -- ----<20 -- ----<20 -- ----<20 -- -------- -------- ----<20 -- -------- -------- ----<2 -- ----<2 -- ----<2 -- ----<2 -- -------- -------- -------- May 2019 Page 27 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. GBC-3 GBC-5 GBC-5 GBC-6 GBC-7 FAY-SW-GBC-3-052919 FAY-SW-GBC-5-052919 FAY-SW-GBC-5-052919-D FAY-SW-GBC-6-052919 FAY-SW-GBC-7-052919 280-124472-6 280-124472-9 280-124472-10 280-124472-11 280-124472-12 5/29/2019 5/29/2019 5/29/2019 5/29/2019 5/29/2019 ----Field Duplicate ---- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento 680 1,300 1,200 1,400 1,200 310 520 490 J 550 410 <41 <41 <41 <41 <41 <210 210 <210 <210 <210 460 780 690 J 820 780 70 130 130 J 140 130 <79 <79 <79 <79 <79 1,400 1,600 J 1,800 J 1,900 1,600 <28 <28 <28 <28 <28 <24 <24 <24 <24 <24 <60 <60 <60 <60 <60 <70 <70 <70 <70 <70 <34 <34 34 <34 34 <160 <160 <160 <160 <160 <58 <58 <58 <58 <58 <15 <15 <15 <15 <15 <54 <54 <54 <54 <54 <46 <46 <46 <46 <46 <27 <27 <27 <27 <27 31 39 35 47 56 <37 <37 <37 <37 <37 <60 <60 <60 <60 <60 <35 <35 <35 <35 <35 <110 <110 <110 <110 <110 2,300 3,300 3,200 3,500 3,000 ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- May 2019 Page 28 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. GBC-TR1 GBC-TR2 CFR-MILE-56 CFR-MILE-68 FAY-SW-GBC-TR1-1-052919 FAY-SW-GBC-TR2-1-052919 FAY-SW-CFR-RM-56-052219 FAY-SW-CFR-RM-08-052219 280-124472-7 280-124472-8 280-124268-1 280-124268-2 5/29/2019 5/29/2019 5/22/2019 5/22/2019 -------- TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento 160 490 ---- 110 230 <20 UJ <20 UJ <41 <41 <2 UJ <2 UJ <210 <210 <5 UJ <5 UJ 130 310 <2 UJ 2 J <58 <58 <2 UJ <2 UJ <79 <79 <2 UJ <2 UJ 900 1,100 <10 UJ 10 J <28 <28 <2 UJ <2 UJ <24 <24 <2 UJ <2 UJ <60 <60 <2 UJ <2 UJ <70 <70 UJ <2 UJ <2 UJ <34 <34 <2 UJ <2 UJ <160 <160 2 J 4.9 J <58 <58 UJ 12 J 7.9 J <15 <15 <2 UJ <2 UJ <54 <54 2.8 J 7.6 J <46 <46 <2 UJ <2 UJ <27 <27 <2 UJ <2 UJ <30 <30 <2 UJ <2 UJ <37 <37 <2 UJ <2 UJ <60 <60 <2 UJ <2 UJ <35 <35 <2 UJ <2 UJ <110 <110 <2 UJ <2 UJ 1,100 1,600 17 32 ----<4 <4 ----7.9 6.9 ----<2 <2 ----<2 <2 ----13 9.5 ----<2 <2 ----8.3 7.2 ----18 15 ----17 13 ----<2 <2 ----<2 <2 ----<2 <2 ----3 3.3 ----<2 <2 ----<2 <2 ----5 5.4 ----<2 <2 ----15 13 ----<2 <2 ----<2 <2 ----<20 <20 ----<20 <20 ----<20 <20 ----<20 <20 -------- -------- ----<20 <20 -------- -------- ----<2 <2 ----<2 <2 ----<2 <2 ----<2 <2 -------- -------- -------- May 2019 Page 29 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. CFR-MILE-76 CFR-BLADEN CFR-KINGS CFR-KINGS FAY-SW-CFR-RM-76-052219 FAY-SW-CFR-BLADEN-052219 FAY-SW-CFR-KINGS-052319 FAY-SW-CFR-KINGS-052319-D 280-124268-3 280-124268-4 280-124325-2 280-124325-3 5/22/2019 5/22/2019 5/23/2019 5/23/2019 ------Field Duplicate TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento TestAmerica Sacramento -------- <20 UJ <20 UJ <20 <20 <2 UJ <2 UJ <2 <2 <5 UJ 130 J 7.8 J 8.4 J 3.5 J 40 J 29 29 <2 UJ 9.9 J 7.5 7.6 <2 UJ 3.5 J 2.4 2.4 <10 UJ 31 J 29 21 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ 4 J 10 J <2 <2 UJ <2 UJ <2 <2 <2 UJ 9.6 J 20 J <2 5.2 J 31 J 7.6 J 8.3 J <2 UJ <2 UJ <2 <2 4.1 J 6.1 J 6.2 J <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 <2 UJ <2 UJ <2 <2 13 270 140 93 <4 28 17 16 6.2 6.8 4.9 4.9 <2 <2 <2 <2 <2 <2 <2 <2 8.4 8.2 6.3 5.7 <2 <2 <2 <2 6.9 6.8 6.7 6.7 12 12 8.9 9 12 13 9.9 9.4 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 3.1 3.3 2.7 2.9 <2 <2 <2 <2 <2 <2 <2 <2 4.7 5 4.2 4.3 <2 <2 <2 <2 13 13 12 12 <2 <2 <2 <2 <2 <2 <2 <2 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 <20 -------- -------- <20 <20 <20 <20 -------- -------- <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 <2 UJ <2 <2 <2 <2 <2 -------- -------- -------- May 2019 Page 30 of 38 August 2019 TABLE 4 ANALYTICAL RESULTS Chemours Fayetteville Works, North Carolina Geosyntec Consultants of NC P.C. Field Event Location ID Field Sample ID Laboratory Sample ID Date Sampled QA/QC Laboratory Table 3+ Lab SOP (ng/L) HFPO-DA PEPA PFECA-G PFMOAA PFO2HxA PFO3OA PFO4DA PMPA Hydro-EVE Acid EVE Acid PFECA B R-EVE PFO5DA Byproduct 4 Byproduct 5 Byproduct 6 NVHOS PES PFESA-BP1 PFESA-BP2 N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Total Table 3+ Compounds* EPA Method 537 Mod (ng/L) HFPO-DA Perfluorobutanoic Acid Perfluorodecanoic Acid Perfluorododecanoic Acid Perfluoroheptanoic Acid Perfluorononanoic Acid Perfluorooctanoic acid Perfluorohexanoic Acid Perfluoropentanoic Acid Perfluorotetradecanoic Acid Perfluorotridecanoic Acid Perfluoroundecanoic Acid Perfluorobutane Sulfonic Acid Perfluorodecane Sulfonic Acid Perfluoroheptane sulfonic acid (PFHpS) Perfluorohexane Sulfonic Acid Perfluorononanesulfonic acid Perfluorooctanesulfonic acid Perfluoropentane sulfonic acid (PFPeS) 10:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS) 6:2 Fluorotelomer sulfonate 1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS) N-ethyl perfluorooctane sulfonamidoacetic acid N-ethylperfluoro-1-octanesulfonamide 2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol N-methyl perfluorooctane sulfonamidoacetic acid N-methyl perfluoro-1-octanesulfonamide 2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol Perfluorododecane sulfonic acid (PFDoS) Perfluorohexadecanoic acid (PFHxDA) Perfluorooctadecanoic acid Perfluorooctane Sulfonamide ADONA F-53B Major F-53B Minor Notes: * - Total Table 3+ was calculated using TestAmerica Sacramento data where it was available since this lab provides a more complete dataset compared to Eurofins Lancaster. If HFPO-DA was not analyzed under Table 3+, the corresponding HFPO-DA result from EPA Method 537 Mod was included in the sum, including data from Eurofins Lancaster. The total includes J qualified data but not non-detect data. The total Table 3+ sum is rounded to two significant figures. Bold - Analyte detected above associated reporting limit B - analyte detected in an associated blank EPA - Environmental Protection Agency J - Analyte detected. Reported value may not be accurate or precise ND - No Table 3+ compounds were detected above their associated reporting limits. ng/L - nanograms per liter QA/QC - Quality assurance/ quality control SOP - standard operating procedure UJ – Analyte not detected. Reporting limit may not be accurate or precise. -- - No data reported < - Analyte not detected above associated reporting limit. Outfall 002 Excess River Water EQBLK EQBLK DSTW-OUTFALL 002-052019 DSTW-EXCESS RIVER WATER-05