NC0003573_Charaterization of PFAS_20210921

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Geosyntec '
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
CHARACTERIZATION OF PFAS IN
PROCESS AND NON -PROCESS
WASTEWATER AND STORMWATER
Initial Characterization - Final Quarterly Report
Prepared for
The Chemours Company FC, LLC
22828 NC-87
Fayetteville, NC 28306
Prepared by
Geosyntec Consultants of NC, P.C.
2501 Blue Ridge Road, Suite 430
Raleigh, NC 27607
Geosyntec Project Number TR0795A
December 18, 2020
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12/18/2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
TABLE OF CONTENTS
1. INTRODUCTION 5
2. BACKGROUND 6
2.1 Paragraph 11(c) Reporting Background 6
2.2 Site and Conveyance Network Background 7
2.2.1 Locations and Location Categories 8
3. FINAL QUARTERLY REPORT OBJECTIVES 10
4. PARAGRAPH 11(C) METHODS AND SCOPE 10
4.1 Sample Locations 11
4.2 Field Methods 11
4.2.1 General Field Methods 11
4.2.2 Grab Sampling Methods 12
4.2.3 Temporal Composite Sampling Methods 12
4.2.4 Wet Event Sampling Methods 13
4.3 Laboratory Methods 13
5. ASSESSMENT OF PARAGRAPH 11(C) INITIAL CHARACTERIZATION 14
5.1 Presentation of Results Table 3+ 17 Compounds 14
5.2 Results Tables and Figures 14
5.3 Statistical Assessment Technique 15
5.4 Conveyance Network PFAS Data Observations 16
5.4.1 Intake River Water at Facility 17
5.4.2 Non-Chemours Process Wastewater 17
5.4.3 Non -Contact Cooling Water 18
5.4.4 Stormwater 18
5.4.5 Stormwater-NCCW 19
5.4.6 Wastewater Treatment Plant 19
5.4.7 Combined Flows to Outfall 002 20
6. PARAGRAPH 11(D) SAMPLING PLAN UPDATES 20
7. SUMMARY AND RECOMMENDATIONS 22
8. REFERENCES 24
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LIST OF TABLES
Table 1: Paragraph 11(b) Sample Location Summary
Table 2: Summary of Samples Collected
Table 3: PFAS and Associated Analytical Methods
Table 4: Summary Statistics for HFPO-DA, PFMOAA, and PMPA
Table 5: Summary Statistics for Total Table 3+ (17 Compounds), Total Table 3+ (20
Compounds), and Total EPA Method 537
Table 6: Wilcoxon Rank Sum Test Results for Comparison to Location 1 (Intake River
Water at Facility)
LIST OF FIGURES
Figure 1: Site Location Map
Figure 2: Paragraph 11(b) Sample Locations
Figure 3A: HFPO-DA, PFMOAA, and PMPA Summary Statistics - Locations that
Reach Outfall 002 - All Events
Figure 3B: Total Table 3+ and Total EPA Method Mod 537 Summary Statistics -
Locations that Reach Outfall 002 - All Events
Figure 4A: Total Table 3+ Concentrations — Non-Chemours Process Wastewater
Figure 4B: Total Table 3+ Concentrations — Non -Contact Cooling Water
Figure 4C: Total Table 3+ Concentrations — Stormwater
Figure 4D: Total Table 3+ Concentrations — Stormwater-Non-Contact Cooling Water
Figure 4E: Total Table 3+ Concentrations — Wastewater Treatment Plant
Figure 4F: Total Table 3+ Concentrations — Combined Flows to Outfall 002
Figure 5A: Median Total Table 3+ Concentrations — All Locations
Figure 5B: Median Total EPA Method 537 Mod Concentrations — All Locations
Figure 6: Paragraph 11(d) Sample Locations
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LIST OF APPENDICES
Appendix A: 2020 Quarter 3 Paragraph 11(c) Methods and Results
Appendix B: Sitewide and Targeted Stormwater Sampling Summary
Appendix C: Analytical Results — All Sampling Events
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ACRONYMS AND ABBREVIATIONS
CO Consent Order
COC Chain of Custody
DEQ The North Carolina Department of Environmental Quality
DO Dissolved oxygen
DQO data quality objectives
DVM Data Verification Module
EIM Environmental Information Management
EPA Environmental Protection Agency
EPA 537M EPA Method 537 Mod
HDPE High Density Polyethylene
HFPO-DA Hexafluoropropylene oxide dimer acid
Hydrolyzed PSDA 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro
sulfoethoxy)propoxy]-acetic acid
IXM ion exchange materials
MS matrix spike
MGD million gallons per day
MSD matrix spike duplicates
NCCW non -contact cooling water
ng/L nanograms per liter
PFAS per- and polyfluoroalkyl substances
PFMOAA 2,2-difluoro-2-(trifluoromethoxy) acetic acid
PMDF Polymer Manufacturing and Development Facility
PMPA perfluoromethoxypropyl carboxylic acid
PPA Polymer Processing Aid
QA/QC quality assurance/ quality control
R-EVE 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4, 5, 5,5-
octafluoro-pentanoic acid
R-PSDA 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-2-
sulfoethoxy)-pentanoic acid
SOP Standard Operating Procedure
TestAmerica TestAmerica Sacramento
WWTP Wastewater treatment plant
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EXECUTIVE SUMMARY
This report was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The
Chemours Company FC, LLC (Chemours) pursuant to Paragraph 11(c) in the executed
Consent Order entered February 25, 2019 amongst Chemours, the North Carolina
Department of Environmental Quality (DEQ), and Cape Fear River Watch.
The objective of Paragraph 11(c) was to conduct an Initial Characterization of the
constituents and concentrations of per- and polyfluoroalkyl substances ("PFAS") in the
raw water intake and in process wastewater, non -process wastewater, and stormwater at
the Chemours Fayetteville Works, North Carolina site (the Facility). Paragraph 11(c)
requires Chemours to submit a final quarterly report no later than 18 months after
approval of a sampling plan. This report represents the required final quarterly report.
The objectives of the final quarterly report are to summarize the findings of the Paragraph
11(c) sampling events collected during the 18-month Initial Characterization period, and
provide recommendations for transitioning to Paragraph 11(d), Ongoing Sampling.
Chemours and its two tenants, Kuraray and DuPont, currently operate five manufacturing
areas on the site along with two other areas servicing manufacturing activities. These
various areas both use and produce water which flows through the site conveyance
network to Outfall 002. The site conveyance network waters are comprised of three (3)
water types (process wastewater, non -process wastewater, and stormwater) and five (5)
primary flows that combine prior to discharge at Outfall 002. The flow pathways at the
Facility are listed below:
1. Cooling Water Channel, which transmits non -process wastewater, commonly
called non -contact cooling water (NCCW), and stormwater from the Chemours
Monomers Ion Exchange Materials (IXM) area;
2. Wood Lined Trench, which transmits NCCW from Kuraray areas and stormwater
from Kuraray and the Chemours Polymer Processing Aid (PPA) area;
3. Wastewater Treatment Plant (WWTP) Discharge, which transmits treated waters
from the WWTP;
4. DuPont Area Ditches, which transmit NCCW and stormwater from DuPont; and
5. Open Channel to Outfall 002, which combines the above conveyances and
transmits and discharges these flows through Outfall 002.
Chemours submitted, and NCDEQ approved in writing, a PFAS Characterization
Sampling Plan (the Sampling Plan) which identified sample locations and methods for
bimonthly sample collection during the Initial Characterization period to represent the
various water sources and flow types. The 31 sample locations were grouped into seven
location categories developed to facilitate analysis and interpretation of data collected
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during this program. The location categories were developed based on locations having
either (a) a common type of water (e.g., NCCW), or (b) a common spatial and flow path
relationship (e.g., WWTP related locations). The seven categories are listed and briefly
described below:
Location Category
Description
Intake River Water at Facility
Represents background PFAS concentrations
Non-Chemours Process Wastewater
Locations representing process wastewater from
Kuraray and DuPont
Non -Contact Cooling Water
Locations representing NCCW from Kuraray
and Chemours
Stormwater
Locations containing only stormwater from
throughout the Facility
Stormwater-Non-Contact Cooling
Water
Locations representing commingled stormwater
and NCCW
Wastewater Treatment Plant
Locations representing the WWTP influent and
effluent, and the Terracotta pipe, which prior to
November 2017 transmitted Chemours process
wastewater to the WWTP and will be
decommissioned in 2021
Combined Flows to Outfall 002
Locations representing stormwater, NCCW, and
process wastewater from the combined flow
pathways at the Facility in the Open Channel to
Outfall 002
Chemours collected samples in accordance with the Sampling Plan for nine (9) bimonthly
sampling events during the 18-month Initial Characterization period from April 2019 to
September 2020. Samples were analyzed for EPA Method 537 Mod (EPA 537M) and
Table 3+ Method PFAS. EPA 537M PFAS compounds are often associated with effluents
from municipal WWTPs and firefighting foams, amongst other sources. Table 3+ PFAS
compounds are often related to operations at the Facility. Summarized findings and
recommendations from the Initial Characterization are listed below:
Summary of Findings
The following conclusions can be drawn based on the samples collected during the Initial
Characterization period:
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• The intake river water at the facility (Location 1) contains PFAS before this water
is used at the Facility. PFAS detected at Location 1 represent the background level
of PFAS at other sampling locations.
• Across all locations, EPA 537M PFAS were not statistically different or higher
than intake data with the exception of one location (23A) on the Terracotta pipe
which is being decommissioned in 2021.
• Non-Chemours process wastewater locations (Locations 18, 19A, 19B, and 23B)
and NCCW only locations (Locations 6A, 6B, 24A, 24B, and 24C) generally have
low PFAS concentrations, similar to or less than those observed at the intake river
water at the Facility.
• The primary sources of total Table 3+ PFAS concentrations to Outfall 002 are (1)
locations comprising both stormwater and non -process wastewater from the
Monomers IXM area, (2) stormwater-only locations, and (3) the WWTP effluent,
including PFAS loadings from the Terracotta pipe which prior to November 2017
transmitted Chemours process water to the WWTP.
The degree of PFAS contributions from the sources outlined in the last bullet above are
expected to be reduced through on -going present and planned future actions, including:
• Continued use of the Thermal Oxidizer and other air emissions controls at Site
reduces aerial emissions of PFAS. This mitigates future PFAS loading to surfaces
and subsequent stormwater concentrations;
• Pursuant to the Consent Order Addendum, the in -progress separation of NCCW
and stormwater flows occurring in the Monomers IXM Area and the 2021 planned
treatment of stormwater flows in this area will reduce PFAS contributions from
the Monomers Area; and
• The planned 2021 decommissioning of the Terracotta pipe will reduce PFAS
contributions to the WWTP.
Summary of Recommendations
Based on these findings above, the following recommendations are made as the sampling
program transitions from the Initial Characterization period of Paragraph 11(c) to
Ongoing Sampling in Paragraph 11(d):
• Continue analyzing EPA 537M at the intake river water at Location 1 and
Location 20 only;
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• Upon completion of the Monomers IXM stormwater treatment system, replace
Locations 9, 10, 10A, 24A, 24B, and 24C with one new sample location
representing the combined NCCW;
• Replace locations representing inputs to the WWTP (Locations 6A, 6B, 18, 19A,
19B, 23A, 23B) with ongoing sampling of the WWTP influent (Location 22); and
• Replace stormwater-only Locations 2, 3, 4, and 5 with ongoing sampling of
downstream Location 7A.
Pursuant to Paragraph 11(d), over the next two years starting in January 2021, Chemours
will continue to collect bimonthly samples to characterize PFAS in the intake river water,
process wastewater, non -process wastewater, and stormwater at the Facility. Chemours
requests approval from DEQ to perform the ongoing sampling in accordance with these
recommendations by January 8, 2021. Results will be reported semi-annually, i.e. every -
other quarter, within 90 days of the previous semiannual period. The first report will be
submitted within 90 days of the end Quarter 2, 2021.
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1. INTRODUCTION
This report was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The
Chemours Company FC, LLC (Chemours) as the final quarterly report for Initial
Characterization of the identification of constituents and concentrations of per- and
polyfluoroalkyl substances ("PFAS") in process wastewater, non -process wastewater,
and stormwater at the Chemours Fayetteville Works, North Carolina site (the Facility,
Figure 1). This report was prepared pursuant to Paragraph 11(c) in the executed Consent
Order amongst Chemours, the North Carolina Department of Environmental Quality
(DEQ), and Cape Fear River Watch, entered into court on February 25, 2019.
This is the sixth and final quarterly report addressing Paragraph 11(c) of the Consent
Order. The objective of this report reflects the same stated objective in the PFAS
Characterization Sampling Plan (Geosyntec, 2019a): to characterize the concentrations
of PFAS in the raw water intake at the Facility, process wastewater, non -process
wastewater, and stormwater, including water that is discharged through Outfall 002.
This final quarterly report summarizes the findings across nine (9) Paragraph 11(c)
sampling events through the 18-month Initial Characterization period, and provides
recommendations for transitioning to Paragraph 11(d), Ongoing Sampling. The
remainder of this document is organized as follows:
• Section 2 — Background: this section describes the Facility, the conveyance
network which transmits flow to Outfall 002, locations sampled and location
categories, and Paragraph 11(c) quarterly reporting to date;
• Section 3 — Final Quarterly Report Objectives: this section describes the
objectives of this report;
• Section 4 — Paragraph 11(c) Methods: this section describes the methods
employed for sample collection and analysis over the 18-month Initial
Characterization period;
• Section 5 — Assessment of Paragraph 11(c) Initial Characterization: this
section describes PFAS concentrations trends and observations in investigative
samples over the 18-month Initial Characterization period;
• Section 6 — Proposed Paragraph 11(d) Sampling Plan Updates: this section
describes recommendations for transitioning to ongoing sampling activities
pursuant to Paragraph 11(d) of the executed Consent Order;
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• Section 7 — Summary and Recommendations: this section summarizes the
observations of results from the Initial Characterization period and recommended
changes to the sampling plan; and
• Section 8 — References: this section lists the documents referenced in the report.
2. BACKGROUND
This section provides a summary of past Paragraph 11(c) quarterly reports and a
background overview of how the Facility uses water, the types of water present at the
site, how this water flows to the Facility's discharge point at Outfall 002 and how the
locations sampled as part of Paragraph 11(c) were grouped for interpretation.
2.1 Paragraph 11(c) Reporting Background
Chemours submitted the PFAS Characterization Sampling Plan (the Sampling Plan) to
DEQ on May 6, 2019 (Geosyntec, 2019a) and received written approval from DEQ on
June 19, 2019. Past quarterly reports for the bimonthly sampling program have
summarized the activities conducted during the previous quarter, reported observed
trends in context to previous bimonthly sampling events, and provided recommendations
to implement during the next quarter. A summary of the bimonthly sampling events and
supplemental investigations included in past quarterly reports are provided in the table
below.
Quarterly
Report
No.
Date
Submitted
Activities Summarized
Reference
1
July 31,
2019
April 2019 and June 2019 bimonthly
sampling events collected in 2019 Quarter 2
Geosyntec,
2019b
2
October
31, 2019
August 2019 bimonthly sampling event
collected in 2019 Quarter 3 and
supplemental investigations completed in
2019 Quarters 2 and 3
Geosyntec,
2019c
3
January
31, 2020
October 2019 and December 2019
bimonthly sampling events collected in 2019
Quarter 4
Geosyntec,
2020a
4
April 30,
2020
January 2020 bimonthly sampling event
collected in 2020 Quarter 1
Geosyntec,
2020b
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Quarterly
Report
No.
Date
Submitted
Activities Summarized
Reference
5
July 31,
2021
April 2020 and May/June 2020 bimonthly
sampling events collected in 2020 Quarter 2
Geosyntec,
2020c
The ninth and final bimonthly sampling event for the 18-month Initial Characterization
period was collected in 2020 Quarter 3 as a dry event on August 26, 2020 (the August
2020 event). Samples were collected as outlined in the PFAS Characterization Sampling
Plan (Geosyntec, 2019a), with adjustments made based on recommendations in prior
reports (Geosyntec 2019a, 2019b, 2019c, 2020a, 2020b, and 2020c). Results from the
investigative samples in the August 2020 event are included in Appendix A and presented
and discussed with the data from the entire program in this report.
2.2 Site and Conveyance Network Background
Chemours and its two tenants, Kuraray and DuPont, currently operate five manufacturing
areas on the site along with two other areas servicing manufacturing activities. These
areas are shown in Figure 1 and listed below:
• Chemours Monomers Ion Exchange Materials (IXM);
• Chemours Polymer Processing Aid (PPA) Area;
• Kuraray Trosifol® Leased Area;
• Kuraray SentryGlas® Leased Area;
• DuPont Polyvinylfluoride Leased Area;
• Wastewater treatment plant (WWTP); and
• Power Area at the Facility (produces filtered water and demineralized water).
These various areas both use and produce water which flows through the site conveyance
network to Outfall 002. As an example of flows through Outfall 002, during normal
operations between January and November 2020, the operations from Chemours and its
tenants, DuPont and Kuraray, resulted in Facility discharges at Outfall 002 of primarily
NCCW at flow rates between 7.2 to 36.5 million gallons per day (MGD) with a median
flow of 21.9 MGD. The site conveyance network waters are comprised of three (3) water
types and five (5) primary flows as they combine at Outfall 002. Thirty-one (31) sample
locations representing the various water types and flow pathways were grouped into
seven (7) categories described in the following sub -section to facilitate the analyses of
data collected during this program. The water types and flow pathways at the Facility are
listed below:
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Water Types
1. Process wastewater. Note, Chemours process wastewaters are presently disposed
of offsite while tenant (Kuraray and DuPont) process wastewaters are treated at
the onsite WWTP prior to discharge;
2. Non -Process Wastewater. Note, Non -Process Wastewater is also commonly
called non -contact cooling water (NCCW); and
3. Stormwater.
Flow Pathways
1. Cooling Water Channel, which transmits NCCW and stormwater from the
Chemours Monomers IXM area;
2. Wood Lined Trench, which transmits NCCW from Kuraray areas and stormwater
from Kuraray and the Chemours PPA area;
3. Wastewater Treatment Plant Discharge, which transmits treated waters from the
WWTP;
4. DuPont Area Ditches, which transmit NCCW and stormwater from DuPont; and
5. Open Channel to Outfall 002, which combines the above flows and transmits and
discharges them through Outfall 002.
2.2.1 Locations and Location Categories
The 31 locations were grouped into seven location categories developed to facilitate
analysis and interpretation of data collected during this program. The location categories
were developed based on locations having either (a) a common type of water (e.g.,
NCCW), or (b) a common spatial and flow path relationship (e.g., WWTP related
locations). The seven categories are listed below and then described:
• Intake River Water at Facility
• Non-Chemours Process Wastewater
• Non -Contact Cooling Water
• Stormwater
• Stormwater-Non-Contact Cooling Water
• Wastewater Treatment Plant
• Combined Flows to Outfall 002
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Intake River Water at Facility
The majority (-98%) of water discharged at Outfall 002 originates from water drawn
from the Cape Fear River. Samples were collected at the intake river water at the Facility
(Location 1, Figure 2) to represent the background concentration of PFAS in water
entering the conveyance network.
Non-Chemours Process Wastewater
Process wastewater from non-Chemours manufacturing areas (Kuraray and DuPont
leased areas) are piped to the WWTP for treatment and ultimately discharge via the
WWTP to Outfall 002. Non-Chemours Process Wastewater locations include: Kuraray
process wastewater (Location 18), DuPont Plant 1 process wastewater (Location 19A),
DuPont Plant 2 process wastewater (Location 19B), and Kuraray Laboratory process
wastewater (Location 23B) as shown on Figure 2.
Non -Contact Cooling Water
Non -contact cooling water (i.e. NCCW) is non -process wastewater used to cool
equipment in manufacturing areas. This water does not directly contact manufactured
products. NCCW is derived from the intake river water. The NCCW locations include
Kuraray Area non -process wastewater (Locations 6A and 6B) and Monomers IXM non -
process wastewater (Locations 24A, 24B, and 24C) as shown on Figure 2. The Kuraray
and Monomers IXM non -process wastewater sources of flow discharge to Outfall 002 via
the WWTP and the Cooling Water Channel, respectively.
Stormwater
Stormwater is a source of flow to Outfall 002 throughout the Site during and shortly after
precipitation events. The stormwater-only locations include Kuraray northern area
(Location 2), the PPA area (Location 3), the combined Kuraray northern area and PPA
areas (Location 4), the Kuraray southern area (Location 5), the Monomers IXM area
(Location 10), and the former DuPont Polymer Manufacturing and Development Facility
(PMDF) area (Location 11) as shown on Figure 2. Additional site -wide and targeted
stormwater sampling was conducted to support the investigations related to Paragraph 12
of the executed Consent Order. Results of this sampling are described in Appendix B.
Stormwater-Non-Contact Cooling Water
Stormwater and NCCW are commingled in some of the flow pathways at the site as
described earlier. The locations comprising Stormwater-NCCW include locations from
the western portion of the Facility (Location 7A), non -process wastewater and stormwater
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from Monomers IXM (Locations 9 and 10A), DuPont area non -process wastewater and
stormwater (Locations 12, 13, and 14), non -process wastewater and stormwater from the
eastern portion of the Facility (Location 15), and the southern sediment basin (Location
21A) as shown on Figure 2.
Wastewater Treatment Plant
Effluent from the WWTP is a source of flow to Outfall 002. The WWTP receives process
wastewater from Kuraray and DuPont, non -process wastewater from throughout the
Facility, and some stormwater flows. Wastewater Treatment Plant category locations
include the WWTP effluent (Location 8), the WWTP combined influent (Location 22),
and the Terracotta pipe (Location 23A) as shown on Figure 2.
Combined Flows to Outfall 002
Stormwater, NCCW, and process wastewater from all flow pathways at the Facility
combine in the Open Channel to Outfall 002. Locations include the Open Channel to
Outfall 002 downstream of the WWTP (Location 7B), the Open Channel to Outfall 002
downstream of DuPont area (Location 7C), and Outfall 002 (Location 20) as shown on
Figure 2.
3. FINAL QUARTERLY REPORT OBJECTIVES
This final quarterly report summarizes the data from the nine bimonthly sampling events
that have been collected to characterize PFAS in non -process wastewater, process
wastewater, and stormwater at the Facility, pursuant to Paragraph 11(c) of the executed
Consent Order. Objectives of the final quarterly report are to:
1) identify trends and observations at each location / location category using time
trend plots,
2) evaluate if each location contains PFAS concentrations in addition to the
background concentrations observed at the intake river water at the Facility
(Location 1) using statistical methods, and
3) make recommendations for the Ongoing Sampling program pursuant to Paragraph
11(d) based on the Initial Characterization program findings.
4. PARAGRAPH 11(C) METHODS AND SCOPE
This section describes the methods implemented for the 18-month Initial Characterization
period including locations sampled, field methods implemented, and laboratory methods
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used. Further details on these locations and methods are provided in the prior quarterly
reports.
4.1 Sample Locations
Locations sampled are described in Table 1 and shown in Figure 2. The number of
samples collected during the 18-month period during each bimonthly sampling event
varied from nineteen (19) in the October 2019 sampling event to thirty (30) in the
May/June 2020 event. Table 2 provides a summary of the sample locations collected
during each event. Adjustments to some sample locations were made based on
recommendations stated in prior reports. A summary of these changes is listed below:
• Chemours process wastewater Locations 16, 17A, and 17B were not sampled after
2019 Quarter 2 as water from these locations are presently disposed of offsite and
do not reach Outfall 002 (Geosyntec, 2019c).
• Location 7C was added to the Sampling Plan beginning in the May 2020 to
characterize PFAS concentrations in the Open Channel to Outfall 002
downstream of the confluence with discharge from the DuPont area (Geosyntec,
2020c).
• Location 10A was added to the Sampling Plan in May 2020 to characterize PFAS
concentrations of the combined Chemours Monomers IXM NCCW and
stormwater discharge (Geosyntec, 2020c).
• Location 23B was added to the Sampling Plan in June 2019 to evaluate the
Kuraray laboratory process wastewater, an input to the Terracotta pipe.
4.2 Field Methods
Field methods used during the Initial Characterization period are documented in previous
quarterly reports. The following sub -sections summarize these field methods. Appendix
A provides a detailed description of field methods for the August 2020 event.
4.2.1 General Field Methods
Equipment was inspected by the field program supervisor, decontaminated, and
calibrated daily prior to use in the field, according to the manufacturer's
recommendations. Field parameters (e.g., pH, temperature, turbidity) were measured
with a water quality meter prior to sample collection for grab samples, and for temporal
composite samples, once during composite sampling (collected directly from the water
stream), and once after composite sampling (collected from the autosampler reservoir).
A field notebook and location -specific field forms were used to record information
regarding additional items such as quality assurance/ quality control (QA/QC), sample
identifications, color, odor, and other field observations.
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Field QA/QC samples, including field duplicates, equipment blanks, field blanks, and trip
blanks were collected and analyzed during the bimonthly sampling events as described
in Appendix A and Geosyntec (2019b, 2019c, 2020a, 2020b, and 2020c).
Upon sample collection, labelled and containerized samples were placed inside an
insulated sample cooler with ice. Prior to shipment of the samples to the laboratory, a
chain of custody (COC) form was completed identifying sample locations, sample
identification numbers, and specific laboratory analyses to be performed on the samples.
COCs were signed by the field personnel relinquishing the samples to the courier and
were signed by the laboratory upon receipt of the cooler.
4.2.2 Grab Sampling Methods
Grab samples were collected from locations where temporal variability over the course
of one day was not expected. These locations include non -process wastewater only
locations (Locations 6A, 6B, 24A, 24B, and 24C), select process wastewater only
locations (Locations 19A and 19B), and the Sediment Basin South location (Location
21A), as identified in Table 2 and shown on Figure 2. All grab samples were collected by
directly filling the HDPE bottle with the sample. Other locations collected as grab
samples during the Initial Characterization period are identified below:
• Location 7B was collected as a grab sample for the April and June 2019 events
due to limited autosampler availability. This location was collected as a temporal
composite sample for the August 2019 event and all further sampling events.
• Locations 18 and 23A were collected as four grab samples over four hours during
the August 2019 event to assess temporal variability at these locations. Due to
temporal variability, future samples were collected as temporal composites.
• Location 22 was collected as a temporal composite beginning in the April 2020
event. All previous samples at this location were grab samples.
4.2.3 Temporal Composite Sampling Methods
Temporal composite samples were collected during the bimonthly sampling events from
locations where variability was expected to potentially be significant within a short time
frame (e.g., one day). These locations, identified in Table 2 and shown on Figure 2,
include those within the site conveyance network and the intake and outfall locations,
since these locations can have highly variable dissolved and suspended constituent loads
over short time periods. Temporal composite samples were collected using a dedicated
Teledyne 6712C autosampler equipped with a rain gauge, HDPE tubing, silicon tubing,
and an HDPE sample reservoir. During dry sampling events, autosamplers integrated
water over a four-hour sample collection period. During wet sampling events, the
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integration time on the autosamplers was set to correspond to the duration of the storm
event.
4.2.4 Wet Event Sampling Methods
The May/June 2020 event included a wet sampling event in May 2020 and a dry sampling
event in June 2020. Locations that contain stormwater (Locations 1, 2, 3, 4, 5, 7A, 7B,
7C, 8, 9, 10, 10A, 11, 12, 13, 14, 15, 20, and 21A) were sampled on May 20, 2020 during
a storm event following an 11-day antecedent dry period. The storm event began on May
18, 2020 and lasted through May 21, 2020; a total of 3.2 inches of rainfall fell during the
storm event. Composite samples were collected over a 3.75-hour period during the peak
intensity of the storm event. In accordance with the PFAS Characterization Sampling
Plan (Geosyntec, 2019a), Locations 6A, 6B, 8, 18, 19A, 19B, 22, 23A, 23B, 24A, 24B,
and 24C were collected during dry weather on June 3, 2020, following 72 hours with less
than 0.5 inches of rain.
4.3 Laboratory Methods
Samples were analyzed for PFAS by the following methods:
• Table 3+ Laboratory Standard Operating Procedure (SOP); and
• EPA Method 537 Mod Laboratory SOP (EPA 537M).
PFAS reported under each of these methods are listed in Table 3.
Throughout the Initial Characterization period, laboratory analyses were performed
largely in accordance with the PFAS Characterization Sampling Plan (Geosyntec, 2019a)
and within the guidelines specified by the laboratory SOPs. The collection frequency of
field duplicates, matrix spike / matrix spike duplicates (MS/MSD), trip blanks, and
equipment blanks was largely in accordance with the PFAS Characterization Sampling
Plan (Geosyntec, 2019a). Deviations, as listed in Appendix A and Geosyntec (2019b,
2019c, 2020a, 2020b, and 2020c), were acceptable as previous QA/QC samples met
criteria.
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 data usability, in view of the project's data quality objectives
(DQOs), was assessed and the data were entered into the EIM system. Details regarding
the data review process are provided in Appendix A for the August 2020 event and
Geosyntec (2019b, 2019c, 2020a, 2020b, and 2020c) for other bimonthly sampling
events.
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5. ASSESSMENT OF PARAGRAPH 11(C) INITIAL CHARACTERIZATION
This section presents an assessment of the key observations and summary statistics
observed over the 18-month Initial Characterization period. Observations in this section
are based on total Table 3+ concentrations and total EPA 537M concentrations. Table 3+
PFAS compounds are often related to Chemours manufacturing processes whereas EPA
537M PFAS compounds are generally associated with firefighting foams, municipal
WWTPs, and other background sources. The remainder of this section discusses the
presentation of Table 3+ results and PFAS data observations, including a statistical
evaluation of the data.
5.1 Presentation of Results Table 3+ 17 Compounds
For clarity, the text and figures of this report describe the Table 3+ 17 compound sums
while both Table 3+ 17 compound and Table 3+ 20 compound sums are included in the
tables.
As reported in the Matrix Interference During Analysis of Table 3+ Compounds memorandum
(Geosyntec, 2020d), matrix interference studies conducted by the analytical laboratory
(TestAmerica, Sacramento) have shown that the quantitation of three compounds (R-
PSDA [formerly Byproduct 4], Hydrolyzed PSDA [formerly Byproduct 5], and R-EVE)
is inaccurate due to interferences by the sample matrix in both groundwater and surface
water. Given the matrix interference issues, Total Table 3+ PFAS concentrations are
calculated and presented in the tables of this report in two ways: (i) summing over 17 of
the 20 Table 3+ compounds "Total Table 3+ (sum of 17 compounds)", i.e., excluding
results of R-PSDA, Hydrolyzed PSDA, and R-EVE; and (ii) summing over 20 of the
Table 3+ compounds "Total Table 3+ (sum of 20 compounds)". Expressing these data as
a range represents possible values of what these results might be without matrix
interferences. In other words, the sum of all 17 compounds is an underestimate of the
actual value while the sum of the 20 compounds is likely an overestimate of the actual
value.
5.2 Results Tables and Figures
The observations and assessment described in this section are based on the following
figures:
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• Figure 3A presents summary statistics for HFPO-DA1, PFMOAA2, and PMPA3
concentrations for locations that reach Outfall 002. Table 4 represents these data
tabularly;
• Figure 3B presents summary statistics for total Table 3+ concentrations and total
EPA 537M concentrations for locations that reach Outfall 002. Table 5 represents
these data tabularly;
• Figures 4A — 4F present time series plots for total Table 3+ concentrations. Each
time series plot displays the total Table 3+ concentrations observed during each
event at the intake river water at the Facility (Location 1) and at other locations
as grouped by sample location type described in Section 4.1 (e.g., Stormwater,
NCCW, etc.).;
• Figures 5A and 5B display the median total Table 3+ and total EPA 537M
concentration by location for all sampling locations, respectively;
• Table 6 presents results from the Wilcoxon Rank Sum test evaluation; and
• Appendix C presents a complete summary of the PFAS concentrations in the
samples collected during the 18-month initial characterization period.
Median concentrations are discussed throughout this section. The median was selected as
the measure of central tendency for this discussion because the data are often skewed and
not normally distributed, as is common for environmental data. The median represents a
robust measure of central tendency not influenced by outliers.
5.3 Statistical Assessment Technique
The data set collected for each location in the sampling program was compared to
background concentrations of the River Intake Water data set using the Wilcoxon Rank
Sum. The Wilcoxon Rank Sum test is a non -parametric test used to evaluate whether the
distributions of total EPA 537M PFAS and/or total Table 3+ PFAS concentrations at each
location were statistically different than those at the intake river water at the Facility
(Location 1). The Wilcoxon Rank Sum test is appropriate for small sample sizes that are
not normally distributed. The tests were conducted at the 5% level of significance, i.e., a
= 0.05. Therefore, a p-value result greater than 0.05 indicates the subject location
concentration distribution was not significantly different from the distribution at Location
1, i.e., is not adding PFAS significantly above background concentrations. A p-value
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1 HFPO-DA - hexafluoropropylene oxide dimer acid
2 PFMOAA - 2,2-difluoro-2-(trifluoromethoxy) acetic acid
3 PMPA - perfluoromethoxypropyl carboxylic acid
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result less than 0.05 indicates the subject location concentration distribution was
significantly higher (positive result statistic) or lower (negative result statistic) than the
distribution collected from Location 1. For example, a positive result statistic and a p-
value less than 0.05 indicate that the location is contributing PFAS above median
background concentrations. Table 6 presents results from the non -parametric Wilcoxon
Rank Sum test evaluation for total Table 3+ and total EPA 537M concentrations in the
investigative samples. Stormwater-only locations were only sampled during one (1)
sampling event (May/June 2020); therefore, results from all stormwater locations were
grouped into one dataset and compared to the dataset from Location 1. The results of the
statistical assessment are described on a location category basis in the next sub -section.
5.4 Conveyance Network PFAS Data Observations
This sub -section presents the assessment of results from the nine sampling events.
Observations are summarized in the list and table below and described in the remainder
of this section on a per location category basis.
Summary of Observations
• Across all locations EPA 537M PFAS were not statistically different or higher
than intake river water data with the exception of one location (23A) on the
Terracotta pipe which will be decommissioned in 2021;
• Table 3+ PFAS in NCCW-only locations and non-Chemours process wastewater
locations are similar to background concentrations observed at the intake river
water and are not statistically different or significantly lower, with the exception
of one location (23B) which decreased to intake concentration levels over the
course of the program. Location 23B also drains through the Terracotta pipe
which will be decommissioned in 2021;
• Table 3+ PFAS were statistically higher for locations which either contained
stormwater or water related to the WWTP effluent; and
• Monomers IXM area flows containing stormwater have higher concentrations of
Table 3+ PFAS during both wet and dry weather compared to other stormwater-
NCCW locations which decrease during dry periods. Pursuant to Paragraph 4(a)
of the Addendum to Consent Order Paragraph 12 (CO Addendum) Chemours will
capture and treat stormwater in the catchment area shown on Attachment 6 of the
CO Addendum; this system includes separating NCCW and stormwater flows in
the Monomers IXM area.
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Location Category
EPA 537M PFAS Statistical
Assessment Outcome
Table 3+ PFAS
Statistical Assessment
Outcome
Non-Chemours Process
Wastewater
Not Different or Lower than
Intake
Not Different or Lower
than Intake*
Non -Contact Cooling Water
Not Different than Intake
Not Different than Intake
Stormwater
Not Different than Intake
Greater than Intake
Stormwater-NCCW
Not Different than Intake
Some Greater than Intake
(stormwater from
Monomers IXM)
Wastewater Treatment Plant
Not Different than Intake**
(influent and effluent only)
Greater than Intake
Combined Flows to
Outfall 002
Not Different than Intake
Greater than Intake
(WWTP and stormwater)
* Location 23B concentrations were initially higher than the intake river water but have declined and been
similar to the intake since January 2020. Flows from Location 23B discharge to the Terracotta pipe which
is being decommissioned in 2021.
** Wastewater treatment plant influent and effluent EPA 537M concentrations were not statistically
different or higher from the intake, but an upstream location (23A) in the Terracotta pipe did have elevated
EPA 537M concentrations. This source to the wastewater treatment plant will be removed with the planned
decommissioning of the Terracotta pipe in 2021.
5.4.1 Intake River Water at Facility
As observed in Figures 4A — 4F, total Table 3+ concentrations at Location 1 were
relatively consistent over the 18-month sampling program, varying between 48 ng/L to
120 ng/L with a median of 58 ng/L (Figures 3B and 5A; Table 4). Total EPA 537M
concentrations were also consistent, varying between 30 ng/L to 190 ng/L with a median
of 55 ng/L (Figures 3B and 5B; Table 5). The samples collected at Location 1 were
considered to represent the background concentration of PFAS at the facility. Detected
PFAS at Location 1 were generally observed in other facility locations that derive water
from the river intake.
5.4.2 Non-Chemours Process Wastewater
Figure 4A presents a time series plot of total Table 3+ data collected from non-Chemours
process wastewater locations. Process wastewater total Table 3+ concentrations from
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Kuraray (Location 18) and DuPont (Locations 19A and 19B) were consistently lower
than or similar to the intake river water (Location 1) and generally reduced over time
(Figure 4A). The distribution of total Table 3+ and total EPA 537M concentrations for
non-Chemours process wastewater were similar to the intake river water (Figures 3A, 3B,
5A, and 5B; Tables 4 and 5). The statistical assessment indicated that for both EPA 537M
PFAS and Table 3+ compounds, PFAS concentrations in Non-Chemours Process
Wastewater concentrations are not different or lower than concentrations from the intake
river water at the Facility for all locations, except for Kuraray Laboratory process
wastewater (Location 23B), which was significantly greater for Table 3+ compounds only
(Table 6). Location 23B concentrations were initially higher than the intake river water
(Location 1) but have declined and been similar to the intake since January 2020 (Figure
4A). Flows from Location 23B discharge to the Terracotta pipe which will be
decommissioned in 2021.
5.4.3 Non -Contact Cooling Water
Figure 4B presents a time series plot of total Table 3+ data collected from NCCW
locations and indicates the total Table 3+ concentrations from NCCW are consistently
similar to Location 1. One data point at Location 24C in December 2019 was an order of
magnitude higher than the intake value. This isolated event is not reflective of long term
NCCW concentrations (Geosyntec, 2020a). NCCW concentrations returned and
remained at normal levels in the following January 2020 event. The statistical evaluation
indicated total Table 3+ and total EPA 537M concentrations for NCCW were not
significantly different from the intake river water (Figures 3A, 3B, 5A, and 5B; Tables 4,
5, and 6).
5.4.4 Stormwater
Figure 4C presents total Table 3+ data collected from stormwater-only locations in the
May/June 2020 event. All other bimonthly sampling events were collected during dry
weather; stormwater-only locations were either dry or not hydraulically connected to
Outfall 002 during other sampling events. Based on statistical evaluation of the May/June
2020 event, Table 3+ PFAS are present in stormwater at significantly higher
concentrations compared to the intake river water at the facility (Location 1) (Table 6).
The sample representing stormwater from the Monomers IXM area (Location 10) had the
highest total Table 3+ PFAS concentration (9,800 ng/L) of all the stormwater locations
(Figure 4C, Appendix C). Pursuant to paragraph 4(a) of the CO Addendum, Chemours
will capture and treat stormwater in the catchment area shown on Attachment 6 of the CO
Addendum. Total EPA 537M concentrations at stormwater locations were similar to
intake river water concentrations (Figures 3B and 5B; Table 5); the statistical assessment
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indicated EPA 537M concentrations for stormwater from the May/June 2020 event were
not significantly different than the intake river water (Table 6).
5.4.5 Stormwater-NCCW
Figure 4D presents a time series of total Table 3+ data collected from stormwater-NCCW
locations. These locations contain combined stormwater and NCCW flows. As shown
previously, NCCW is not a contributor of PFAS to Outfall 002 while stormwater,
primarily from the Monomers IXM Area, is a contributor. These stormwater-NCCW
locations contain Table 3+ PFAS at concentrations greater than the river intake. The two
controlling factors are if the samples were collected during wet weather or are in or
downstream from the Monomers IXM Area.
As a specific example of the effect of wet weather events, the samples representing the
western portion of the Facility (Location 7A), which primarily contain Kuraray NCCW,
were similar to the intake river water (Location 1) except during the May 2020 wet
weather event when stormwater was being actively added to these flows.
Table 3+ PFAS concentrations in stormwater-NCCW locations in or downstream of the
Monomers IXM area (Locations 9, 10A, 15, and 21A) were generally higher than
concentrations at other stormwater-NCCW locations (Locations 7A, 12, 13, and 14)
during both dry and wet weather sampling events. NCCW from the Monomers IXM area
has similar concentrations to the intake water, therefore elevated concentrations observed
during both dry and wet events are likely due to ongoing PFAS contributions from
stormwater inflows that are not fully flushed from the sampling locations. NCCW and
stormwater flows from the Monomers IXM area will be separated and the stormwater
treated as pursuant to paragraph 4(a) of the CO Addendum previously discussed. The
statistical evaluation indicated Table 3+ PFAS concentrations from stormwater-NCCW
in locations in or downstream of the Monomers IXM area with enough samples for
statistical comparison were significantly higher than the intake river water (Table 6).
The distribution of EPA 537M concentrations at all stormwater-NCCW locations were
similar to the intake river water concentrations (Figures 3B and 5B; Table 5). The
statistical assessment indicated EPA 537M concentrations at all stormwater-NCCW
locations were not significantly different from the intake river water for those locations
with enough samples for statistical comparison (Table 6).
5.4.6 Wastewater Treatment Plant
Figure 4E presents a time series of total Table 3+ data collected from the WWTP
locations. The total Table 3+ concentrations at the WWTP effluent (Location 8), the
combined WWTP influent (Location 22), and the Terracotta pipe (Location 23A) are
elevated compared to, and statistically higher than, the intake river water (Location 1) for
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all events (Figures 4E and 5A; Table 6). Pursuant to paragraph 4(d), Chemours is
preparing a report on sources of PFAS to the WWTP by May 31, 2021. Chemours and its
tenant Kuraray are also decommissioning the Terracotta pipe. Prior to November 2017,
the Terracotta pipe transmitted Chemours process wastewater to the WWTP.
The distribution of total EPA 537M concentrations at the WWTP influent and effluent
were similar to, and not significantly different from, total EPA 537M intake river water
concentrations (Figures 3B and 5B; Tables Sand 6). The median total EPA 537M
concentration at the Terracotta pipe (Location 23A) was over 5 times greater than the
median total EPA 537M concentration at Location 1 (Figure 3B, Table 5), and the
statistical evaluation indicated Location 23A was the only location with EPA 537M
concentrations significantly higher than the intake river water (Table 6). As noted above,
this component of the WWTP influent stream, the Terracotta pipe, is being
decommissioned in 2021.
5.4.7 Combined Flows to Outfall 002
Figure 4F presents a time series of total Table 3+ data collected from the locations
representing the combined flows to Outfall 002. These locations contain Table 3+ PFAS
from upstream sources including combinations of WWTP effluent, NCCW, and
stormwater. The locations representing the combined flows to Outfall 002 have Table 3+
PFAS concentrations that are significantly greater than the intake river water for those
locations with enough samples for statistical comparison (Figures 3B and 5A; Tables 5
and 6). The increases over intake river water concentrations are interpreted to originate
from both stormwater and WWTP effluent. First, the two highest total Table 3+
concentrations at these locations were measured during the wet weather May/June 2020
event indicating the stormwater contributions. Second, Location 7A upstream of the
WWTP effluent is routinely lower in concentration than Location 7B downstream of the
WWTP effluent.
The statistical assessment indicated EPA 537M concentrations at the locations
representing combined flows to Outfall 002 were not significantly different from the
intake river water for those locations with enough samples for statistical comparison
(Table 6).
6. PARAGRAPH 11(D) SAMPLING PLAN UPDATES
Based on the findings in Section 5 and planned activities at the Facility described below,
several revisions are recommended to the Sampling Plan for the Ongoing Sampling
program pursuant to Paragraph 11(d). These recommendations fall into two categories:
1. Remove sampling locations and analyte groups that are not contributing PFAS to
Outfall 002 or are characterized by other sampling locations and programs; and
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2. Reconfiguration of the sampling locations in the Monomers IXM area based on
the upcoming separation of NCCW and stormwater flows and stormwater
treatment.
Recommendations and rationale for the proposed Sampling Plan revisions are provided
in the table below. The proposed sample locations for Paragraph 11(d) after completion
of the stormwater treatment system in June 2021 are provided in Figure 6.
Recommendation
Rationale
Continue analyzing EPA 537M
compounds at the intake river water
at the Facility (Location 1) and
Outfall 002 (Location 20) only.
Total EPA 537M concentrations were not
significantly different or were significantly less
than the total EPA 537M concentrations at the
river intake water.4 The intake river water at the
facility (Location 1) and Outfall 002 (Location
20) are proposed to continue to be analyzed for
EPA 537M compounds.
Replace the sampling locations in
the Monomers IXM area
(Locations 9, 10, 10A, 24A, 24B,
24C) with one new sample location
(Location 9A) representing the
combined NCCW from Monomers
IXM upon completion of the
Monomers IXM stormwater
treatment system.
This recommendation is supported because: (1)
NCCW Locations 24A, 24B, and 24C have
contained low and relatively homogenous levels
of PFAS relative to the intake water at the facility
(Location 1) and will be combined into one piped
water stream, (2) stormwater from the Monomers
IXM area will be characterized as a part of
stormwater treatment system sampling program,
and (3) combined NCCW and stormwater from
the Monomers IXM area will be sampled
downstream at Location 15.
Replace sampling of inputs to the
WWTP (Locations 6A, 6B, 18,
19A, 19B, 23A, and 23B) with
continued sampling of influent
(Location 22).
This recommendation is supported because: (1)
Locations 6A, 6B, 18, 19A, and 19B are not
sources of PFAS, and (2) individual sources to
the WWTP are being investigated as part of the
ongoing supplemental WWTP sampling plan.
Replace upstream stormwater-only
locations from the western portion
Stormwater from the western portion of the
facility is characterized downstream of Locations
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Recommendation
Rationale
of the facility (Locations 2, 3, 4,
and 5) with downstream combined
sampling at Location 7A.
2, 3, 4, and 5 at Location 7A during wet weather
events.
7. SUMMARY AND RECOMMENDATIONS
Pursuant to Consent Order Paragraph 11(c), this final quarterly report summarizes results
and observations from the nine bimonthly sampling events collected during the 18-month
initial characterization period. The objective of the initial characterization period was to
characterize the concentrations of PFAS in the raw water intake, process wastewater, non -
process wastewater, and stormwater at the Facility.
Summary of Findings
The following conclusions can be drawn based on the samples collected during the initial
characterization period:
• The intake river water at the facility (Location 1) contains PFAS before this water
is used at the Facility. PFAS detected at Location 1 represent the background level
of PFAS at other sampling locations.
• Across all locations, EPA 537M PFAS were not statistically different or higher
than intake data with the exception of one location (23A) on the Terracotta pipe
which is being decommissioned in 2021.
• Non-Chemours process wastewater locations (Locations 18, 19A, 19B, and 23B)
and NCCW only locations (Locations 6A, 6B, 24A, 24B, and 24C) generally have
low PFAS concentrations, similar to or less than those observed at the intake river
water at the Facility.
• The primary sources of total Table 3+ PFAS concentrations to Outfall 002 are (1)
locations comprising both stormwater and non -process wastewater from the
Monomers IXM area, (2) stormwater-only locations, and (3) the WWTP effluent,
including PFAS loadings from the Terracotta pipe which prior to November 2017
transmitted Chemours process water to the WWTP.
The degree of PFAS contributions from the sources outlined in the last bullet above will
be mitigated through on -going present and planned future actions, specifically:
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• Continued use of the Thermal Oxidizer and other air emissions controls at the
Facility reduces aerial emissions of PFAS. This mitigates future PFAS loading to
surfaces and subsequent stormwater concentrations;
• Pursuant to the CO Addendum, the in -progress separation of NCCW and
stormwater flows occurring in the Monomers IXM Area and the 2021 planned
treatment of stormwater flows in this area will reduce PFAS contributions from
the Monomers Area; and
• The planned 2021 decommissioning of the Terracotta pipe will reduce PFAS
contributions to the WWTP.
Summary of Recommendations
Based on these findings above, the following recommendations are made as the sampling
program transitions from the initial characterization period of Paragraph 11(c) to Ongoing
Sampling in Paragraph 11(d):
• Continue analyzing EPA 537M at the intake river water at Location 1 and
Location 20 only;
• Upon completion of the Monomers IXM stormwater treatment system, replace
Locations 9, 10, 10A, 24A, 24B, and 24C with one new sample location
representing the combined NCCW;
• Replace locations representing inputs to the WWTP (Locations 6A, 6B, 18, 19A,
19B, 23A, 23B) with ongoing sampling of the WWTP influent (Location 22); and
• Replace stormwater-only Locations 2, 3, 4, and 5 with ongoing sampling of
downstream Location 7A.
Pursuant to Paragraph 11(d), over the next two years starting in January 2021, Chemours
will continue to collect bimonthly samples to characterize PFAS in the intake river water,
process wastewater, non -process wastewater, and stormwater at the Facility. Chemours
requests approval from DEQ to perform the ongoing sampling in accordance with these
recommendations by January 8, 2021. Results will be reported semi-annually, i.e. every -
other quarter, within 90 days of the previous semiannual period. The first report will be
submitted within 90 days of the end Quarter 2, 2021.
TR0795A
23 18-December-20

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
8. REFERENCES
Geosyntec, 2019a. PFAS Characterization Sampling Plan. May 6, 2019.
Geosyntec, 2019b. Characterization of PFAS in Process and Non -Process Wastewater
and Stormwater: Quarterly Report #1. July 31, 2019.
Geosyntec, 2019c. Characterization of PFAS in Process and Non -Process Wastewater
and Stormwater: Quarterly Report #2. October 31, 2019.
Geosyntec, 2019d. Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge
and Evaluation of Potential Control Options. August 2019.
Geosyntec, 2020a. Characterization of PFAS in Process and Non -Process Wastewater
and Stormwater: Quarterly Report #3. January 31, 2020.
Geosyntec, 2020b. Characterization of PFAS in Process and Non -Process Wastewater
and Stormwater: Quarterly Report #4. April 30, 2020.
Geosyntec, 2020c. Characterization of PFAS in Process and Non -Process Wastewater
and Stormwater: Quarterly Report #5. July 31, 2020.
Geosyntec, 2020d. Matrix Interference During Analysis of Table 3+ Compounds.
Chemours Fayetteville Works. July 31, 2020.
TR0795A
24 18-December-20

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLES

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 1
PARAGRAPH 11(b) SAMPLE LOCATION SUMMARY
Chemours Fayetteville Works, North Carolina
Sample Category
Sample
Location ID
Sample Location Description
Sampling Method
Sample Included in
May 2019 PFAS
Characterization
Plan
Intake River Water at Facility
1
Discharge point of excess river water (i.e., water drawn from the Cape Fear River, but not used as
process water or NCCW) to characterize background levels of PFAS
Temporal Composite
✓
Non-Chemours Process
Wastewater
18
Kuraray process wastewater
Grab/Tempo*al
Composite
✓
19A
DuPont process wastewater, Plant 1
Grab
✓
19B
DuPont process wastewater, Plant 2
Grab
✓
23B
Kuraray laboratory process wastewater
Grab
NCCW
6A
Kuraray southern leased area NCCW discharge - Vacuum Condenser
Grab
✓
6B
Kuraray southern leased area NCCW discharge - Resins Area
Grab
✓
24A
Chemours Monomers IXM Vinyl Ethers South NCCW
Grab
✓
24B
Chemours Monomers IXM Line 3 and Line 4 Extruder NCCW
Grab
✓
24C
Chemours Monomers IXM Water Return Header NCCW
Grab
✓
Stormwater
2
Kuraray northern leased area stormwater discharge
Temporal Composite
✓
3
Chemours PPA area stormwater discharge
Temporal Composite
✓
4
Combined stormwater discharge from Kuraray northern leased area and Chemours PPA area
Temporal Composite
✓
5
Kuraray southern leased area stormwater
Temporal Composite
✓
10
Chemours Monomers IXM area stormwater discharge
Temporal Composite
✓
11
Stormwater discharge from portion of grassy field to north of decommissioned Chemours Teflon area
Temporal Composite
✓
Stormwater-NCCW
7A
Combined stormwater and NCCW discharge from western portion of the Facility
Temporal Composite
✓
Chemours Monomers IXM NCCW and stormwater discharge including stormwater from Vinyl Ethers9
South and Vinyl Ethers North
Temporal Composite
✓
10A
Combined Chemours Monomers IXM NCCW and stormwater discharge
Temporal Composite
12
DuPont area southern drainage ditch stormwater discharge and NCCW
Temporal Composite
✓
13
DuPont area northern drainage ditch stormwater discharge and NCCW
Temporal Composite
✓
14
DuPont area southeast stormwater and NCCW discharge
Temporal Composite
✓
15
Combined stormwater and NCCW discharge from eastern portion of the Facility
Temporal Composite
✓
21A
Sediment Basin South
Grab
✓
21B
Sediment Basin North
Grab
✓
Wastewater Treatment Plant
8
Outfall 001 treated non-Chemours process wastewater discharge to open channel to Outfall 002
Temporal Composite
✓
22
WWTP combined influent
Grab/Temporal
Composite*
✓
23A
Kuraraynorthern leased area combinedprocess wastewater and NCCW; opengrate on Terracotta pipe
p p p
Grab/Temporal
Composite*
✓
Combined Flows to Outfall 002
7B
Combined stormwater and NCCW discharge from western portion of the Facility and treated discharge
from WWTP
Grab/Temporal
Composite*
✓
7C
Combined stormwater and NCCW discharge from western portion of the Facility, the eastern portion of
the Facility, and the DuPont Area, and treated discharge from WWTP
Temporal Composite
20
Outfall 002 pipe to Cape Fear River upstream of sump
Temporal Composite
✓
Chemours Process Wastewater
16
Chemours Monomers IXM Area combined process wastewater
Grab
✓
17A
Chemours PPA Area waste acid trailer
Grab
✓
17B
Chemours PPA Area waste rinse water trailer
Grab
✓
Notes
Sample locations refer to locations identified in Figure 2.
Temporal composite samples were integrated over 4 hours in dry weather, or less time to line up with the duration of a storm event in wet weather.
Intake River Water at Facility sample location represents background concentrations of PFAS.
Non-Chemours Process Wastewater sample locations contain process wastewater from non-Chemours manufacturing areas.
NCCW sample locations contain non -process wastewater from Kuraray and Chemours manufacturing areas.
Stormwater sample locations contain stormwater only.
Stormwater-NCCW sample locations are locations containing both stormwater and non -process wastewater from throughout the Facility.
Wastewater Treatment Plant sample locations contain process wastewater from non-Chemours manufacturing areas and non -process wastewater from throughout the Facility.
Combined Flows to Outfall 002 contain process wastewater, non -process wastewater, and stormwater from throughout the Facility.
Chemours Process Wastewater sample locations contain Chemours process wastewater only and do not contribute flow to Outfall 002.
The open grate on Terracotta pipe was formerly referred to as the manhole on Terracotta pipe.
IXM - ion exchange membrane
NCCW - non -contact cooling water
PFAS - per- and polyfluoroalkyl substances
PPA - polymer processing aid
WWTP - Wastewater treatment plant
*Select locations were collected as grab samples and as composite samples during different sampling events. Details for each sample are provided in Table 2.
Geosyntec Consultants of NC P.C.
TR0795A December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 2
SUMMARY OF SAMPLES COLLECTED
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sample
Category
Sample
Location
ID
Sample Location Description
Sample Category
Sampling
Method
Sample Collected
2019
2020
April
(Q2)
June (Q2)
August (Q3)
October (Q4)
December
(Q4)
January (Q1)
April (Q2)
May
(Q2)1
June
(Q2)r
August
(Q3)
Intake River
Water at Facility
1
Discharge point of excess river water (i.e., water drawn from the Cape Fear River, but not used
as process water or NCCW) to characterize background levels of PFAS
Intake River Water at
Facility
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
Non-Chemours
Process
Wastewater
18
Kuraray process wastewater
Non-Chemours
Process Wastewater
Grab/
Temporal
Composite'
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
19A
DuPont process wastewater, Plant 1
Non-Chemours
Process Wastewater
Grab
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
19B
DuPont process wastewater, Plant 2
Non-Chemours
Process Wastewater
Grab
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
23B
Kuraray laboratory process wastewater
Non-Chemours
Process Wastewater
Grab
NS10
YES
NS10
YES
YES
YES
YES
NS2
YES
YES
NCCW
6A
Kuraray southern leased area NCCW discharge - Vacuum Condenser
NCCW
Grab
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
6B
Kuraray southern leased area NCCW discharge - Resins Area
NCCW
Grab
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
24A
Chemours Monomers IXM Vinyl Ethers South NCCW
NCCW
Grab
YES
YES
YES
NSI1
YES
YES
YES
NS2
YES
YES
24B
Chemours Monomers IXM Line 3 and Line 4 Extruder NCCW
NCCW
Grab
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
24C
Chemours Monomers IXM Water Return Header NCCW
NCCW
Grab
YES
YES
YES
NS11
YES
YES
YES
NS2
YES
YES
Stormwater
2
Kuraray northern leased area stormwater discharge
Stormwater
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
3
Chemours PPA area stormwater discharge
Stormwater
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
4
Combined stormwater discharge from Kuraray northern leased area and Chemours PPA area
Stormwater
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
5
Kuraray southern leased area stormwater
Stormwater
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
10
Chemours Monomers IXM area stormwater discharge
Stormwater
Temporal
Composite
YES
DRY
YES
YES
YES
YES
NS5
YES
NS2
DRY
11
Stormwater discharge from portion of grassy field to north of decommissioned Chemours
Teflon area
Stormwater
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
Stormwater-
NCCW
7A
Combined stormwater and NCCW discharge from western portion of the Facility
Stormwater-NCCW
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
9
Chemours Monomers IXM NCCW and stormwater discharge including stormwater from Vinyl
Ethers South and Vinyl Ethers North
Stormwater-NCCW
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
10A
Combined Chemours Monomers IXM NCCW and stormwater discharge
Stormwater-NCCW
Temporal
Composite
NS4
NS4
NS4
NS4
NS4
NS4
NS4
YES
NS2
YES
12
DuPont area southern drainage ditch stormwater discharge and NCCW
Stormwater-NCCW
Temporal
Composite
DRY
DRY
YES
DRY
YES
DRY
DRY
YES
NS2
YES
13
DuPont area northern drainage ditch stormwater discharge and NCCW
Stormwater-NCCW
Temporal
Composite
DRY
DRY
DRY
DRY
DRY
DRY
DRY
YES
NS2
DRY
14
DuPont area southeast stormwater and NCCW discharge
Stormwater-NCCW
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
15
Combined stormwater and NCCW discharge from eastern portion of the Facility
Stormwater-NCCW
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
21A
Sediment Basin South
Stormwater-NCCW
Grab
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
21B
Sediment Basin North
Stormwater-NCCW
Grab
NS8
NS8
NS8
NS8
NS8
NS8
NS8
NS8
NS8
NS8
Wastewater
Treatment Plant
8
Outfall 001 treated non-Chemours process wastewater discharge to open channel to Outfall 002
Wastewater
Treatment Plant
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
22
WWTP combined influent
Wastewater
Treatment Plant
Grab/
Temporal
Composite9
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
23A
Kuraray northern leased area combined process wastewater and NCCW; open grate on
Terracotta pipe
Wastewater
Treatment Plant
Grab/
Temporal
7
Composite
YES
YES
YES
YES
YES
YES
YES
NS2
YES
YES
TR0795A
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December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 2
SUMMARY OF SAMPLES COLLECTED
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sample
Category
Sample
Location
ID
Sample Location Description
Sample Category
Sampling
Method
Sample Collected
2019
2020
April
(Q2)
June (Q2)
August (Q3)
October (Q4)
December
(Q4)
January (Q1)
April (Q2)
May
(Q2)1
June
(Q2)r
August
(Q3)
Combined
Flows to Outfall
002
7pt
Combined stormwater and NCCW discharge from western portion of the Facility and treated
discharge from WWTP
Combined Flows to
Outfall 002
Grab/
Temporal
3
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
7C
Combined stormwater and NCCW discharge from western portion of the Facility, the eastern
portion of the Facility, and the DuPont Area, and treated discharge from WWTP
Combined Flows to
Outfall 002
Temporal
Composite
a
NS
a
NS
a
NS
NS
a
NS
a
NS
a
NS
YES
NS2
YES
20
Outfall 002 pipe to Cape Fear River upstream of sump
Combined Flows to
Outfall 002
Temporal
Composite
YES
YES
YES
YES
YES
YES
YES
YES
NS2
YES
Chemours
Process
Wastewater
16
Chemours Monomers IXM Area combined process wastewater
Chemours Process
Wastewater
Grab
YES
YES
NS6
NS6
NS6
NS6
NS6
NS6
NS6
NS6
17A
Chemours PPA Area waste acid trailer
Chemours Process
Wastewater
Grab
YES
YES
NS6
NS6
NS6
NS6
NS6
NS6
NS6
NS6
17B
Chemours PPA Area waste rinse water trailer
Chemours Process
Wastewater
Grab
YES
YES
NS6
NS6
NS6
NS6
NS6
NS6
NS6
NS6
Notes:
Sample Events
April 2019 event (Q2) - 24 April 2019
June 2019 event (Q2) - 27 and 28 June 2019
August 2019 event (Q3) - 21 and 22 August 2019
October 2019 event (Q4) - 9 and 10 October 2019
December 2019 event (Q4) - 20 and 23 December 2019
January 2020 event (Q1) - 29 and 31 January 2020
April 2020 event (Q2) - 28 April 2020
May/June 2020 event (Q2) - 20 May and 3 June 2020
August 2020 event (Q3) - 26 August 2020
Sample numbers refer to locations identified in Figure 2.
All temporal composite samples collected in dry weather were integrated over 4 hours. Temporal composite samples collected during the storm event in May 2020 were integrated over up to 2 hours to line up with the storm event.
1 - Samples collected in May 2020 and June 2020 are considered one sampling event, the May/June 2020 event, which was subdivided into a storm event in May for sample locations with stormwater flows with non-stormwater flow locations collected in June.
2 - For the May/June 2020 event, all locations that contain stormwater were sampled in the storm event in May. All locations that do not contain stormwater were sampled in the dry period in June. Location 8 was sampled in both the storm event in May and the dry period in June.
3 - Location 7B was collected as a grab sample for the April and June 2019 events due to limited autosampler availability. This location was collected as a temporal composite sample for the August 2019 event and all further sampling events.
4 - Locations 7C and 10A were added to the workplan beginning in 2020 Quarter 2 (May/June 2020 event).
5 - Locations 10 was not sampled in the April 2020 event because it was not hydraulically connected to the Outfall 002 at the time of sample collection, per recommendations from the fourth quarterly report of 2019 (Geosyntec, 2020b).
6 - Locations 16, 17A, and 17B were removed from the sampling program as these locations did not contribute flow to Outfall 002 and were consequently not sampled after 2019 Quarter 2.
7 - Locations 18 and 23A were collected as four grab samples over four hours during the August 2019 event to assess temporal variability at these locations. Due to temporal variability, subsequent samples were collected as temporal composites.
8 - Location 21B was not sampled to date because this sediment pond was not in use at the time of sampling.
9 - Location 22 was collected as a temporal composite beginning in the April 2020 event. All previous samples at this location were grab samples.
10 - Location 23B was added to the Sampling Plan after the April 2019 event. It was sampled during the June 2019 event was but was not sampled during the August 2019 event because it had insufficient water to collect a sample.
11 - Locations 24A and 24C were not sampled in October 2019 because these locations did not have flow due to Plant Turn Around.
IXM - ion exchange membrane
NCCW - non -contact cooling water
NS - Not sampled
PFAS - per- and polyfluoroalkyl substances
PPA - polymer processing aid
WWTP - Wastewater treatment plant
TR0795A Page 2 of 2 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A3O-97CB-604DAA2E6672
TABLE 3
PFAS AND ASSOCIATED ANALYTICAL METHODS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Analytical Method
Common Name
Chemical Name
CASN
Chemical Formula
Table 3+ Lab SOP
HFPO-DA*
Hexafluoropropylene oxide dimer acid
13252-13-6
C6HF11O3
PEPA
Perfluoro-2-ethoxypropionic 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
Perfluoro-2-methoxypropionic acid
13140-29-9
C4HF7O3
Hydro -EVE Acid
2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(1,2,2,2-
tetrafluoroethyl)oxy]propan-2-yl}oxy)propionic acid
773804-62-9
C8H2F14O4
EVE Acid
2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(1,2,2-
trifluoroethenyl)oxy]propan-2-yl}oxy)propionic acid
69087-46-3
C8HF13O4
PFECA B
Perfluoro-3,6-dioxaheptanoic acid
151772-58-6
C5HF9O4
R-EVE
Pentanoic acid, 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-
2,2,3,3,4,5,5,5-octafluoro
2416366-22-6
C8H2F12O5
PFOSDA
Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid
39492-91-6
C7HF13O7
R-PSDA
Pentanoic acid, 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro
2-sulfoethoxy)
2416366-18-0
C7H2F12O6S
R-PSDCA
Ethanesulfonic acid, 1,1,2,2-tetrafluoro-2-[1,2,2,3,3-pentafluoro-
1-(trifluoromethyl)propoxy]
2416366-21-5
C6H2F12O4S
Hydrolyzed PSDA
Acetic acid, 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-
tetrafluoro-2-sulfoethoxy)propoxy]
2416366-19-1
C7H3F11O7S
NVHOS
1,1,2,2,4,5,5,5-heptafluoro-3-oxapentanesulfonic acid; or 2-
(1,2,2,2-ethoxy)tetrafluoroethanesulfonic acid; or 1-(1,1,2,2-
tetrafluoro-2-sulfoethoxy)-1,2,2,2-tetafluoroethane
1132933-86-8
C4H2F8O4S
PES
Perfluoro-2-ethoxyethanesulfonic acid
113507-82-7
C4HF9O4S
PSAcid
Ethanesulfonic acid, 2-[1-[difluoro[(1,2,2-
trifluoroethenyl)oxy]methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-
tetrafluoro
29311-67-9
C7HF13O5S
Hydro-PS Acid
Ethanesulfonic acid, 2-[1-[difluoro(1,2,2,2-
tetrafluoroethoxy)methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-
tetrafluoro
749836-20-2
C7H2F14O5S
EPA Method 537
Mod
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
Perfluorotidecanoic 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
CIOH5F17O3S
NEtFOSAA
N-ethyl perfluorooctane sulfonamidoacetic acid
2991-50-6
Cl2H8F17NO4S
NEtPFOSA
N-ethylperfluoro-l-octanesulfonamide
4151-50-2
CIOH6F17NO2S
NEtPFOSAE
N-ethyl perfluorooctane sulphonamidoethanol
1691-99-2
Cl2H10F17NO3S
NMeFOSAA
N-methyl perfluorooctane sulfonamidoacetic acid
2355-31-9
CI1H6F17NO4S
NMePFOSA
N-methyl perfluoro-l-octanesulfonamide
31506-32-8
C9H4F17NO2S
NMePFOSAE
N-methyl perfluorooctane sulfonamidoethanol
24448-09-7
CI1H8F17NO3S
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
C8HCIF16O4S
F-53B Minor
F-53B Minor
83329-89-9
C10HC1F20O4S
ADONA
4,8-dioxa-3H-perfluorononanoate
958445-44-8
C7H2F12O4
NaDONA
NaDONA
EVS1361
--
DONA
DONA
919005-14-4
--
Notes:
*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
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 4
SUMMARY STATISTICS FOR HFPO-DA, PFMOAA, AND PMPA
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Sample Category
Sample Location ID
Sample Location Description
HFPO-DA
(ng/L)
PFMOAA
(ng/L)
PMPA
(ng/L)
No. of
Samples
No. of
Detects
Minimum
Median
Maximum
No. of
Samples
No. of
Detects
Minimum
Median
Maximum
No. of
Samples
No. of
Detects
Minimum
Median
Maximum
Intake River Water at Facility
1
Discharge point of excess river water (i.e., water drawn from the Cape Fear River, but not used as
process water or NCCW) to characterize background levels of PFAS
9
9
9.8
13
30
9
6
5
9.8
25
9
9
17
26
60
Non-Chemours Process
Wastewater
18
Kuraray process wastewater
12
12
3.6
8.6
120
12
0
-
-
-
12
6
15
20
64
19A
DuPont process wastewater, Plant 1
9
9
4.2
18
380
9
3
5.5
8.7
16
9
7
13
27
340
19B
DuPont process wastewater, Plant 2
9
9
2.2
22
75
9
3
5.6
14
37
9
6
12
38
120
23B
Kuraray laboratory process wastewater
7
7
17
35
3,200
7
6
3.7
16
200
7
6
24
32
21,000
NCCW
6A
Kuraray southern leased area NCCW discharge - Vacuum Condenser
9
9
6.7
19
66
9
4
9.9
13
24
9
9
14
30
80
6B
Kuraray southern leased area NCCW discharge - Resins Area
9
9
4.5
17
41
9
4
8.9
11
31
9
9
17
26
53
24A
Chemours Monomers IXM Vinyl Ethers South NCCW
15
15
8.7
17
38
15
10
6.9
10
18
15
15
21
28
96
24B
Chemours Monomers IXM Line 3 and Line 4 Extruder NCCW
10
10
4.7
11
16
10
6
3.2
12
15
10
10
16
23
33
24C
Chemours Monomers IXM Water Return Header NCCW
8
8
5.6
15
270
8
5
3
10
15
8
8
14
27
61
Stormwater
2
Kuraray northern leased area stormwater discharge
1
1
2,700
2,700
2,700
1
0
-
-
-
1
1
220
220
220
3
Chemours PPA area stormwater discharge
1
1
2,700
2,700
2,700
1
0
-
-
-
1
0
-
-
-
4
Combined stormwater discharge from Kuraray northern leased area and Chemours PPA area
1
1
620
620
620
1
1
12
12
12
1
1
65
65
65
5
Kuraray southern leased area stormwater
1
1
100
100
100
1
0
1
1
68
68
68
10'
Chemours Monomers IXM area stormwater discharge
1
1
1,700
1,700
1,700
1
1
5,300
5,300
5,300
1
0
-
-
-
11
Stormwater discharge from portion of grassy field to north of decommissioned Chemours Teflon
area
1
1
320
320
320
1
1
46
46
46
1
1
120
120
120
Stormwater-NCCW
7A
Combined stormwater and NCCW discharge from western portion of the Facility
9
9
7.8
14
200
9
6
5.2
10
14
9
9
15
24
69
9
Chemours Monomers IXM NCCW and stormwater discharge including stormwater from Vinyl
Ethers South and Vinyl Ethers North
9
9
25
55
3200
9
8
5.7
14
390
9
8
18
34
1,000
10A
Combined Chemours Monomers IXM NCCW and stormwater discharge
2
2
56
1,300
2,600
2
1
13,000
13,000
13,000
2
0
-
-
-
12
DuPont area southern drainage ditch stormwater discharge and NCCW
5
5
15
20
77
5
3
12
12
20
5
5
26
52
83
13
DuPont area northern drainage ditch stormwater discharge and NCCW
1
1
640
640
640
1
1
50
50
50
1
1
190
190
190
14
DuPont area southeast stormwater and NCCW discharge
8
8
12
20
120
8
4
8.1
14
25
8
8
15
34
68
15
Combined stormwater and NCCW discharge from eastern portion of the Facility
11
11
34
51
3,000
11
9
8.4
15
2,700
11
10
23
35
680
21A
Sediment Basin South
9
9
16
43
420
9
8
9.5
14
110
9
9
23
43
180
21B3
Sediment Basin North
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Wastewater Treatment Plant
8
Outfall 001 treated non-Chemours process wastewater discharge to open channel to Outfall 002
10
10
96
210
500
10
9
88
280
20,000
10
8
38
100
1,000
22
WWTP combined influent
10
8
27
67
170
10
7
25
56
230
10
7
11
37
1,500
23A
Kuraray northern leased area combined process wastewater and NCCW; open grate on Terracotta
pipe
12
12
570
870
25,000
12
12
320
1,200
1,800
12
6
33
100
1,300
Combined Flows to Outfall 002
7B
Combined stormwater and NCCW discharge from western portion of the Facility and treated
discharge from WWTP
10
10
16
21
200
10
10
9.8
46
1,100
10
10
19
27
66
7C
Combined stormwater and NCCW discharge from western portion of the Facility, the eastern
portion of the Facility, and the DuPont Area, and treated discharge from WWTP
2
2
24
240
460
2
2
36
210
380
2
2
63
82
100
20
Outfall 002 pipe to Cape Fear River upstream of sump
15
15
30
50
940
15
14
13
33
850
15
14
27
33
200
Chemours Process Wastewater
162
Chemours Monomers IXM Area combined process wastewater
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
17A2
Chemours PPA Area waste acid trailer
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
17B2
Chemours PPA Area waste rinse water trailer
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Notes
Sample numbers refer to locations identified in Figure 2.
The summary statistics and number of samples collected reflect the total number of samples collected throughout the initial characterization period, including field duplicates.
HFPO-DA - Hexafluoropropylene oxide dimer acid
IXM - ion exchange membrane
ng/L - nanograms per liter
NCCW - non -contact cooling water
PFAS - per- and polyfluoroalkyl substances
PFMOAA - Perfluoro-2-methoxyacetic acid
PMPA - Perfluoromethoxypropyl carboxylic acid
PPA - polymer processing aid
WWTP - Wastewater treatment plant
1 - The summary statistics and number of samples collected for Location 10 reflect the wet weather May/June 2020 event only.
2 - Locations 16, 17A, 17B were initially in the sampling program but were removed because they do not reach Outfall 002. Summary statistics were not computed for these locations.
3 - Location 21B was not sampled to date because this sediment pond was not in use at the time of sampling.
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 5
SUMMARY STATISTICS FOR TOTAL TABLE 3+ (17 COMPOUNDS), TOTAL TABLE 3+ (20 COMPOUNDS), AND TOTAL EPA METHOD 537
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Sample Category
Sample Location ID
Sample Location Description
Total Table 3+ (17 Compounds)
(ng/L)
Total Table 3+ (20 Compounds)
(ng/L)
EPA Method 537 Mod
(ng/L)
No. of
Samples
Minimum
Median
Maximum
No. of
Samples
Minimum
Median
Maximum
No. of
Samples
Minimum
Median
Maximum
Intake River Water at Facility
1
Discharge point of excess river water (i.e., water drawn from the Cape Fear River, but not
used as process water or NCCW) to characterize background levels of PFAS
9
48
58
120
9
60
76
150
9
30
55
190
Non-Chemours Process Wastewater
18
Kuraray process wastewater
12
6.4
32
260
12
6.4
39
360
12
9
32
120
19A
DuPont process wastewater, Plant 1
9
18
49
970
9
18
49
980
9
5.9
28
99
19B
DuPont process wastewater, Plant 2
9
4.9
67
510
9
4.9
68
510
9
15
26
74
23B
Kuraray laboratory process wastewater
7
110
150
34,000
7
140
170
36,000
7
33
52
730
NCCW
6A
Kuraray southern leased area NCCW discharge - Vacuum Condenser
9
30
81
150
9
43
100
190
9
41
60
190
6B
Kuraray southern leased area NCCW discharge - Resins Area
9
28
67
150
9
30
85
150
9
35
54
380
24A
Chemours Monomers IXM Vinyl Ethers South NCCW
15
52
77
280
15
65
92
280
15
31
64
130
24B
Chemours Monomers IXM Line 3 and Line 4 Extruder NCCW
10
36
54
120
10
46
66
130
10
26
51
190
24C
Chemours Monomers IXM Water Return Header NCCW
8
44
85
2,600
8
66
140
4,500
8
24
53
120
Stormwater
2
Kuraray northern leased area stormwater discharge
1
3,000
3,000
3,000
1
3,100
3,100
3,100
1
18
18
18
3
Chemours PPA area stormwater discharge
1
2,800
2,800
2,800
1
2,800
2,800
2,800
1
44
44
44
4
Combined stormwater discharge from Kuraray northern leased area and Chemours PPA area
1
720
720
720
1
740
740
740
1
9
9
9
5
Kuraray southern leased area stormwater
1
280
280
280
1
420
420
420
1
20
20
20
10'
Chemours Monomers IXM area stormwater discharge
1
9,800
9,800
9,800
1
11,000
11,000
11,000
1
130
130
130
11
Stormwater discharge from portion of grassy field to north of decommissioned Chemours
Teflon area
1
1,200
1,200
1,200
1
1,600
1,600
1,600
1
130
130
] 30
Stormwater-NCCW
7A
Combined stormwater and NCCW discharge from western portion of the Facility
9
41
60
810
9
52
73
1,000
9
31
60
190
9
Chemours Monomers IXM NCCW and stormwater discharge including stormwater from
Vinyl Ethers South and Vinyl Ethers North
9
110
300
12,000
9
170
550
16,000
9
41
63
410
10A
Combined Chemours Monomers IXM NCCW and stormwater discharge
2
370
11,000
21,000
2
750
12,000
24,000
2
56
160
260
12
DuPont area southern drainage ditch stormwater discharge and NCCW
5
65
110
230
5
80
120
300
5
75
83
180
13
DuPont area northern drainage ditch stormwater discharge and NCCW
1
1,300
1,300
1,300
1
1,700
1,700
1,700
1
84
84
84
14
DuPont area southeast stormwater and NCCW discharge
8
47
86
210
8
53
90
240
8
36
98
280
15
Combined stormwater and NCCW discharge from eastern portion of the Facility
11
140
510
13,000
11
210
1,000
17,000
11
38
100
420
21A
Sediment Basin South
9
55
170
1,800
9
59
190
3,000
9
37
82
180
21B2
Sediment Basin North
-
-
-
-
-
-
-
-
-
-
-
-
Wastewater Treatment Plant
8
Outfall 001 treated non-Chemours process wastewater discharge to open channel to Outfall
002
10
560
1,600
31,000
10
930
2,100
36,000
10
32
71
160
22
WWTP combined influent
10
93
290
4,400
10
390
680
18,000
10
32
74
140
23A
Kuraray northern leased area combined process wastewater and NCCW; open grate on
Terracotta pipe
12
5,600
15,000
40,000
12
7,800
20,000
48,000
12
110
300
960
Combined Flows to Outfall 002
7B
Combined stormwater and NCCW discharge from western portion of the Facility and treated
discharge from WWTP
10
71
190
1,900
10
120
310
3,200
10
33
92
960
7C
Combined stormwater and NCCW discharge from western portion of the Facility, the eastern
portion of the Facility, and the DuPont Area, and treated discharge from WWTP
2
220
1,100
2,000
2
340
1,500
2,600
2
45
78
110
20
Outfall 002 pipe to Cape Fear River upstream of sump
15
120
200
4,000
15
180
310
5,300
15
34
60
430
Chemours Process Wastewater
163
Chemours Monomers IXM Area combined process wastewater
-
-
-
-
-
-
-
-
-
-
-
-
17A3
Chemours PPA Area waste acid trailer
-
-
-
-
-
-
-
-
-
-
-
-
17B3
Chemours PPA Area waste rinse water trailer
-
-
-
-
-
-
-
-
-
-
-
-
Notes
Sample numbers refer to locations identified in Figure 2.
The summary statistics and number of samples collected reflect the total number of samples collected throughout the initial characterization period, including field duplicates.
Total Table 3+ (17 compounds) concentration includes HFPO-DA results evaluated by EPA Method 537 Mod and does not include R-PSDA, Hydrolyzed PSDA, and R-EVE.
Non -detect values were not included in sum of Total Table 3+ results or EPA Method 537 Mod.
Total Table 3+ and EPA Method 537 Mod results include J-qualified data.
HFPO-DA - Hexafluoropropylene oxide dimer acid
Hydrolyzed PSDA - Acetic acid, 2-fluoro-2-[ 1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro-2-sulfoethoxy)propoxy]-
IXM - ion exchange membrane
ng/L - nanograms per liter
NCCW - non -contact cooling water
PFAS - per- and polyfluoroalkyl substances
PPA - polymer processing aid
R-EVE - Pentanoic acid, 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4,5,5,5-octafluoro-
R-PSDA - Pentanoic acid, 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-2-sulfoethoxy)-
WWTP - Wastewater treatment plant
1 - The summary statistics and number of samples collected for Location 10 reflect the wet weather May/June 2020 event only.
2 - Location 21B was not sampled to date because this sediment pond was not in use at the time of sampling.
3 - Locations 16, 17A, 17B were initially in the sampling program but were removed because they do not reach Outfall 002. Summary staistics were not computed for these locations.
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE 6
WILCOXON RANK SUM TEST RESULTS FOR COMPARISON TO LOCATION 1 (INTAKE RIVER WATER AT FACILITY)
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Sample Category
Sample
Location ID
Sample Location Description
Total Table 3+
(ng/L)
EPA Method 537 Mod
(ng/L)
Result
p-value
Interpretation '
Result
p-value
Interpretation'
Intake River Water at Facility
1
Discharge point of excess river water (i.e., water drawn from the Cape Fear River, but not used as process
water or NCCW) to characterize background levels of PFAS
-
-
-
-
-
-
Non-Chemours Process Wastewater
18
Kuraray process wastewater
-2.71
0.00666
Lower
-2.42
0.01531
Lower
19A
DuPont process wastewater, Plant 1
-1.10
0.26969
Not Different
-2.52
0.01185
Lower
19B
DuPont process wastewater, Plant 2
-0.57
0.56599
Not Different
-2.25
0.02434
Lower
23B
Kuraray laboratory process wastewater
3.13
0.00175
Higher
0.32
0.74939
Not Different
NCCW
6A
Kuraray southern leased area NCCW discharge - Vacuum Condenser
0.93
0.35384
Not Different
0.66
0.50780
Not Different
6B
Kuraray southern leased area NCCW discharge - Resins Area
0.04
0.96478
Not Different
0.40
0.69110
Not Different
24A
Chemours Monomers IXM Vinyl Ethers South NCCW
1.06
0.29020
Not Different
1.60
0.11029
Not Different
24B
Chemours Monomers IXM Line 3 and Line 4 Extruder NCCW
-1.21
0.22648
Not Different
-0.60
0.54535
Not Different
24C
Chemours Monomers IXM Water Return Header NCCW
1.05
0.29362
Not Different
-0.21
0.83363
Not Different
Stormwater
2
Kuraray northern leased area stormwater discharge
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
3
Chemours PPA area stormwater discharge
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
4
Combined stormwater discharge from Kuraray northern leased area and Chemours PPA area
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
5
Kuraray southern leased area stormwater
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
10
Chemours Monomers IXM area stormwater discharge
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
11
Stormwater discharge from portion of grassy field to north of decommissioned Chemours Teflon area
2.88
0.00395
Higher2
-0.96
0.33667
Not Different2
Stormwater-NCCW
7A
Combined stormwater and NCCW discharge from western portion of the Facility
0.04
0.96478
Not Different
0.62
0.53650
Not Different
9
Chemours Monomers IXM NCCW and stormwater discharge including stormwater from Vinyl Ethers
South and Vinyl Ethers North
3.49
0.00049
Higher
1.55
0.12228
Not Different
10A
Combined Chemours Monomers IXM NCCW and stormwater discharge
-
-
NA3
-
-
NA3
12
DuPont area southern drainage ditch stormwater discharge and NCCW
1.15
0.25059
Not Different
1.78
0.07580
Not Different
13
DuPont area northern drainage ditch stormwater discharge and NCCW
-
-
NA3
-
-
NA3
14
DuPont area southeast stormwater and NCCW discharge
0.74
0.46225
Not Different
1.05
0.29362
Not Different
15
Combined stormwater and NCCW discharge from eastern portion of the Facility
3.97
0.00007
Higher
1.67
0.09404
Not Different
21A
Sediment Basin South
2.69
0.00708
Higher
0.13
0.89463
Not Different
21B
Sediment Basin North
-
-
NA4
-
-
NA4
Wastewater Treatment Plant
8
Outfall 001 treated non-Chemours process wastewater discharge to open channel to Outfall 002
3.78
0.00016
Higher
0.60
0.54535
Not Different
22
WWTP combined influent
3.33
0.00088
Higher
-0.45
0.65015
Not Different
23A
Kuraray northern leased area combined process wastewater and NCCW; open grate on Terracotta pipe
4.16
0.00003
Higher
4.04
0.00005
Not Different
Combined Flows to Outfall 002
7B
Combined stormwater and NCCW discharge from western portion of the Facility and treated discharge
from WWTP
3.10
0.00194
Higher
0.91
0.36435
Not Different
7C
Combined stormwater and NCCW discharge from western portion of the Facility, the eastern portion of the
Facility, and the DuPont Area, and treated discharge from WWTP
-
-
NA3
NA3
20
Outfall 002 pipe to Cape Fear River upstream of sump
4.67
0.00000
Higher
1.27
0.20584
Not Different
Chemours Process Wastewater
16
Chemours Monomers IXM Area combined process wastewater
-
-
NA5
NA5
17A
Chemours PPA Area waste acid trailer
-
-
NA5
NA5
17B
Chemours PPA Area waste rinse water trailer
-
-
NA5
NA5
Notes
Sample numbers refer to locations identified in Figure 2.
The Wilcoxon Rank Sum test was used to compare whether the total Table 3+ concentrations and EPA Method 537 Mod concentrations in samples collected at the subject location were higher or lower than concentrations in the samples collected at Location 1.
Total Table 3+ concentration includes HFPO-DA results evaluated by EPA Method 537 Mod and does not include R-PSDA, Hydrolyzed PSDA, and R-EVE.
Non -detect values were not included in the sum of Total Table 3+ results or EPA Method 537 Mod.
Total Table 3+ and EPA Method 537 Mod results include J-qualified data.
HFPO-DA - Hexafluoropropylene oxide dimer acid
Hydrolyzed PSDA-Acetic acid, 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro-2-sulfoethoxy)propoxy]-
IXM - ion exchange membrane
ng/L - nanograms per liter
NCCW - non -contact cooling water
PFAS - per- and polyfluoroalkyl substances
PPA - polymer processing aid
R-EVE - Pentanoic acid, 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4,5,5,5-octafluoro-
R-PSDA - Pentanoic acid, 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-2-sulfoethoxy)-
W WTP - Wastewater treatment plant
1 - Higher: Concentrations at this location are significantly higher than Location 1 (Intake River Water at Facility)
Lower: Concentrations at this location are significantly lower than Location 1 (Intake River Water at Facility)
Not Different: Concentrations at this location are not signficantly different than Location 1 (Intake River Water at Facility)
2 - Because the stormwater locations only had results from one (1) sampling event (May/June 2020), results from all stormwater locations were grouped into one dataset and compared to concentrations at Location 1.
3 - There were not enough samples at this location for comparison to Location 1 (Intake River Water at Facility)
4 - Location 21B was not sampled to date because this sediment pond was not in use at the time of sampling.
5 - Locations 16, 17A, 17B were initially in the sampling program but were removed because they do not reach Outfall 002. Comparison to Location 1 was not analyzed for these locations.
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
FIGURES

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Legend
❑ Site Features
Site Boundary
Nearby Tributary
— — Observed Seep (Natural Drainage)
Site Conveyance Network
Areas at Site
Chemours Monomers IXM
❑Chemours Polymer
Processing Aid Area
DuPont Polyvinyl Fluoride
Leased Area
Former DuPont PMDF Area
Kuraray SentryGlas®
Leased Area
❑
❑
❑
❑
Notes:
1. The outline of Cape Fear River is approximate and is based on open data from ArcGIS Online and North
Environmental Quality Online GIS (MajorHydro shapefile).
2. Basemap sources: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS,
User Community
Kuraray Trosifol®
Leased Area
Wastewater Treatment Plant
Power - Filtered and
Demineralized Water
Production
Kuraray Laboratory
Carolina Department of
AeroGRID, IGN, and the GIS
Site Location Map
Chemours Fayetteville Works, North Carolina
Geosyntec °
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Figure
rojeotion_ NAU 1933 S2te Plane Nortf Carolina FIPS 3200 Feet Units in Foot
Raleigh
October 2020
1

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
•
Wastewater Treatment Flant Discharge
Legend
OTemporal Composite Sample
Grab Sample
Sample Location Category
Intake River Water at Facility
Non-Chemours Process Wastewater
Non -Contact Cooling Water (NCCW)
Stormwater
Stormwater-NCCW
Wastewater Treatment Plant
Combined Flows to Outfall 002
Ditch Type
Wood Lined Trench
Wastewater Treatment Plant Discharge
Cooling Water Channel
Open Channel to Outfall 002
DuPont Area
Other Connections
QPipe Connection to Facility
Terracotta Pipe and Piping Connected to Terracotta Pipe
=mr Grouted Pipe Section
Notes:
1. Intake River Water at Facility sample location represents background concentrations
of PFAS.
2. Non-Chemours Process Wastewater sample locations represent process wastewater
from non-Chemours manufacturing areas.
3. Non -Contact Cooling Water (NCCW) sample locations represent non -process
wastewater from Kuraray and Chemours manufacturing areas.
4. Stormwater sample locations represent stormwater only.
5. Stormwater-NCCW sample locations represent both stormwater and non -process
wastewater from throughout the Facility.
6. Wastewater Treatment Plant sample locations represent process wastewater from non-
Chemours manufacturing areas and non -process wastewater from throughout the Facility.
7. Combined Flows to Outfall 002 represent process wastewater, non -process
wastewater, and stormwater from throughout the Facility.
8. Basemap Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus
DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.
500 250 0 500 Feet
� � t
Paragraph 11(b) Sample Locations
Chemours Fayetteville Works, North Carolina
Geosyntec'>
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
December 2020
Figure
2
rro,e.cri. , V. vv. ivieramer„ex.ry,Pee e: e ivever

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ngIL)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (nglL)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (nglL)
Maximum (nglL)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ngIL)
HFPO-DA
PFMOAA
PMPA
0
2700
ND
220
2700
ND
220
2700
HFPO-DA
1
620
620
620
HFPO-DA
12
12
3.6
8.6
120
HFPO-DA
9
9
6.7
19
66
HFPO-DA
9
9
4.5
17
ND
PFMOAA
1
12
12
PFMOAA
0
ND
ND
ND
PFMOAA
9
4
9.9
13
24
PFMOAA
9
4
8.9
11
220
PMPA
1
65
65
65
PMPA
12
6
15
20
64
PMPA
9
9
14
30
80
PMPA
9
9
17
26
HFPO-DA
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
HFPO-DA
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
HFPO-DA
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
31
PFMOAA
PFMOAA
PFMOAA
53
7.
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (nglL)
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (ng/L)
HFPO-DA
HFPO-DA
PFMOAA
PFMOAA
No. of Samples
No. of Detects
Minimum (nglL)
Median (nglL)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (ng/L)
Wastewater
` Plant
HFPO-DA
HFPO-DA
•
HFPO-DA
12
12
69
570
25000
HFPO-DA
HFPO-DA
PFMOAA
PFMOAA
PFMOAA
12
12
320
1200
1800
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Treatment
Discharge
PFMOAA
PFMOAA
PMPA
12
6
33
100
1300
HFPO-DA
HFPO-DA
No. of Samples
No. of Detects
Minimum (ng/L)
Median (nglL)
Maximum (ng/L)
PFMOAA
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
HFPO-DA
PFMOAA
HFPO-DA
PFMOAA
PMPA
N. of Samples
2
2
2
No. of Detects
2
1
0
Minimum (nglL)
56
13000
ND
Median (ng/L)
1300
13000
ND
Maximum (ng/L)
2600
13000
ND `
PFMOAA
20000
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (nglL)
HFPO-DA
PFMOAA
-
HFPO-DA
PFMOAA
PMPA
No. of Samples
2
2
H
2
No. of Samples
1
1
1
No. of Detects
2
2
2
No. of Detects
1
1
1
Minimum (nglL)
24
36
63
Minimum (nglL)
640
50
190
Median (nglL)
240
210
82
Median (nglL)
640
50
190
Maximum (ng/L)
460
380
100
Maximum (ng/L)
640
50
190
HFPO-DA
HFPO-DA
HFPO-DA
HFPO-DA
HFPO-DA
HFPO-DA
HFPO-DA
HFPO-DA
PFMOAA
PFMOAA
PFMOAA
PFMOAA
PFMOAA
PFMOAA
PFMOAA
PFMOAA
N
{
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
o. of Samples
o. of Detects
linimum (ng/L)
ledian (ng/L)
laximum (ng/L)
No. of Samples
No. of Detects
Minimum (nglL)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
No. of Detects
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Legend
OTemporal Composite Sample
Grab Sample
Sample Location Category
Intake River Water at Facility
Non-Chemours Process Wastewater
Non -Contact Cooling Water (NCCW)
Stormwater
Stormwater-NCCW
Wastewater Treatment Plant
Combined Flows to Outfall 002
Ditch Type
Wood Lined Trench
Wastewater Treatment Plant Discharge
Cooling Water Channel
Open Channel to Outfall 002
DuPont Area
Other Connections
QPipe Connection to Facility
Terracotta Pipe and Piping Connected to Terracotta Pipe
=N=E=1 Grouted Pipe Section
Notes:
ND - non detect
ng/L - nanograms per liter
HFPO-DA - Hexafluoropropylene oxide dimer acid
PFMOAA- Perfluoro-2-methoxyacetic acid
PMPA - Perfluoromethoxypropyl carboxylic acid
1. See text for sample collection dates.
2. All concentrations are in ng/L.
3. Temporal composite samples were collected over a 4 hour interval.
4. Summary statistics (minimum, median, maximum) presented for detected
concentrations only.
5. Location 10 summary statistics presented for May/June 2020 event only.
500 250 0 500 Feet
HFPO-DA, PFMOAA, and PMPA Summary Statistics —
Locations that Reach Outfall 002 — All Events
Chemours Fayetteville Works, North Carolina
Geosyntec l>
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
December 2020
Figure
3A
rro,euvori: IV. vv. ivieramer„ex.ry P e e: urins ivever

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
1
Total EPA
Method 537 Mod
No. of Samples
3000 18 Minimum (ng/L)
3000 18 _ Median (ng/L)
3000 18 'Maximum (ng/L)
Total
Table 3+
Total EPA
Method 537 Mod
i
Table 3+
Total EPA
Method 537 Mod
No. of Samples
12
12
iTotal
Minimum (ng/L)
6.4
9
Median (ng/L)
32
32
Maximum (ng/L)
260
120
=
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
9
9
Minimum (ng/L)
30
41
Median (ng/L)
81
60
Maximum (ng/L)
150
190
No. of Samples
."+ A1ginaMMIL
Total
Table 3+
9
Total EPA
Method 537 Mod
9
Minimum (ng/L)
28
35
Median (ng/L)
67
54
Maximum (ng/L)
150
380
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
Minimum (ng/L)
9
18
9
5.9
Median (ng/L)
49
28
Maximum (ng/L)
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
970
Total
Table 3+
9
4.9
67
510
99
Total EPA
Method 537 Mod
9
15
26
74
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
9
9
Minimum (ng/L)
41
31
Median (ng/L)
60
60
Maximum (ng/L)
810
190
a Protection: WGS 1984 Web Mercator Auxiliary Sphere: Units in Meter
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
2800 44 r Minimum (ng/L)
2800 44 ' 1 ! Median (ng/L)
2800 44 •J Maximum (ng/L)
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
1
1
Minimum (ng/L)
280
20
Median (ng/L)
280
20
Maximum (ng/L)
280
20
Ir
Total EPA
Method 537 Mod
Total
Table 3+
18000
40000
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
7
7
Minimum (ng/L)
110
33
Median (ng/L)
150
52
Maximum (ng/L)
34000
730
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
Total EPA
Method 537 Mod
32
74
140
Total
Table 3+
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
2
2
Minimum (ng/L)
370
56
Median (ng/L)
11000
160
Maximum (ng/L)
21000
260
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
10
10
Minimum (ng/L)
560
32
Median (ng/L)
1600
71
Maximum (ng/L)
31000
160
Wastewater Treatment
• -
Plant Discharge
Total EPA
Method 537 Mod
Total
Table 3+
No. of Samples
10
10
Minimum (ng/L)
71
33
Median (ng/L)
190
92
Maximum (ng/L)
1900
960
i
Total
Total EPA
Table 3+
Method 537 Mod
No. of Samples
5
5
Minimum (ng/L)
65
75
Median (ng/L)
110
83
Maximum (ng/L)
230
180
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
2
2
Minimum (ng/L)
220
45
Median (ng/L)
1100
78
Maximum (ng/L)
2000
110
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
13000
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
55 37 - Minimum (ng/L)
170 82 Median (ng/L)
Total EPA
Method 537 Mod
Total
Table 3+
Total EPA
Method 537 Mod
Maximum (ng/L)
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
61000
Table 3+
Total
Table 3+
8
Total EPA
Method 537 Mod
Total EPA
Method 537 Mod
Total EPA
Method 537 Mod
Total
Table 3+
Total EPA
Method 537 Mod
No. of Samples
15
15
Minimum (ng/L)
52
31
Median (ng/L)
77
64
Maximum (ng/L)
280
130
Table 3+
No. of Samples
Minimum (ng/L) 110
Median (ng/L) 300
Maximum (ng/L) 12000
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
No. of Samples
Total
Table 3+
1
1200
1200
1200
Total
Table 3+
8
Minimum (ng/L) 47
Median (ng/L)
Maximum (ng/L) 210
No. of Samples
Minimum (ng/L)
Median (ng/L)
Maximum (ng/L)
Total
Table 3+
•IA
Total EPA
Method 537 Mod
Total EPA
Method 537 Mod
1
130
130
130
Total EPA
Method 537 Mod
36
98
280
Total EPA
Method 537 Mod
(0
Legend
O
Temporal Composite Sample
Grab Sample
Sample Location Category
Intake River Water at Facility
Non-Chemours Process Wastewater
Non -Contact Cooling Water (NCCW)
Stormwater
Stormwater-NCCW
Wastewater Treatment Plant
Combined Flows to Outfall 002
Ditch Type
Wood Lined Trench
Wastewater Treatment Plant Discharge
Cooling Water Channel
Open Channel to Outfall 002
DuPont Area
Other Connections
QPipe Connection to Facility
Terracotta Pipe and Piping Connected to Terracotta Pipe
Grouted Pipe Section
Trr
Notes:
ng/L - nanograms per liter
HFPO-DA - Hexafluoropropylene oxide dimer acid
Hydrolyzed PSDA - Acetic acid, 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro-2-
su lfoethoxy)propoxy]-
R-EVE - Pentanoic acid, 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4,5,5,5-octafluoro-
R-PSDA - Pentanoic acid, 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-2-sulfoethoxy)-
1. See text for sample collection dates.
2. All concentrations are in ng/L.
3. Temporal composite samples were collected over a 4 hour interval.
4. Total Table 3+ concentration includes HFPO-DA results evaluated by EPA Method 537
Mod and does not include R-PSDA, Hydrolyzed PSDA, and R-EVE.
5. Non -detect values were not included in sum of Total Table 3+ results or Total EPA
Method 537 Mod.
6. Total Table 3+ and EPA Method 537 Mod results include J-qualified data.
7. Location 10 summary statistics presented for May/June 2020 event only.
500
250
0
500 Feet
Total Table 3+ and Total EPA Method 537 Mod
Summary Statistics — Locations that
Reach Outfall 002 —All Events
Chemours Fayetteville Works, North Carolina
Geosyntec')
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C 3500 and C 295
December 2020
Figure
3B

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000 -
1,000 -
100 -
10 -
1
■
i
Location 1
1
il
Location 18 Location 19A
1
11
Location 19B Location 23B
• April 2019 June 2019 August 2019 October 2019 December 2019 January 2020 ■ April 2020 • May/June 2020 ■ August 2020
Notes:
1. ng/L - nanograms per liter
2. Total Table 3+ 17 compound sums presented.
3. Location 1 represents background concentrations. Other locations represent process wastewater from non-Chemours
manufacturing areas. See Figure 2 for sample locations.
Location 1- Intake River Water at Facility
Location 18 - Kuraray process wastewater
Location 19A - DuPont process wastewater, Plant 1
Location 19B - DuPont process wastewater, Plant 2
Location 23B - Kuraray laboratory process wastewater
Total Table 3+ Concentrations
Non-Chemours Process Wastewater
Chemours Fayetteville Works, North Carolina
Geosyntec l)
consultants
Geosyntec Consultants of NC, P.C. Figure
NC License No.: C-3500 and C-295
Raleigh December 2020
4A

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000 -
10 -
1
•
E
■1 1
Location 1 Location 6A
1
Location 6B Location 24A
1
Location 24B Location 24C
• April 2019 ■ June 2019 August 2019 October 2019 • December 2019 January 2020 • April 2020 May/June 2020 ■ August 2020
Notes: Total Table 3+ Concentrations
1. ng/L- nanograms per liter
2. Total Table 3+ 17 compound sums presented. Non -Contact Cooling Water
3. Location 1 represents background concentrations. Other locations represent non -process wastewater from Kuraray and Chemours Fayetteville Works, North Carolina
Chemours manufacturing areas. See Figure 2 for sample locations.
Location 1- Intake River Water at Facility
Location 6A - Kuraray southern leased area non -process wastewater discharge - Vacuum Condenser Geosyntec ° Geosyntec Consultants of NC, r.c. Figure
Location 6B - Kuraray southern leased area non -process wastewater discharge - Resins Area NC License No.: C-3500 and C-295
Location 24A - Chemours Monomers Ion Exchange Materials (IXM) Vinyl Ethers South non -process wastewater consultants
Location 24B - Chemours Monomers IXM Line 3 and Line 4 Extruder non -process wastewater 4B
Location 24C - Chemours Monomers IXM Water Return Header non -process wastewater Raleigh December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000 -
1,000 -
100 -
10 -
■ Location 1 ■ Location 2 Location 3
May/June 2020
Location 4 Location 5
Notes:
1. ng/L - nanograms per liter
2. Total Table 3+ 17 compound sums presented.
3. Location 1 represents background concentrations. Other locations represent stormwater only. See Figure 2 for sample
locations.
Location 1- Intake River Water at Facility
Location 2 - Kuraray southern leased area stormwater
Location 3 - Chemours Polymer Processing Aid (PPA) area stormwater discharge
Location 4 - Combined stormwater from Kuraray norhtern leased area and Chemours PPA area
Location 5 - Kuraray southern leased area stormwater
Location 10 - Chemours Monomers Ion Exchange Materials (IXM) area storwater discharge
Location 11 - Stormwater discharge from portion of grassy field to north of decommissioned Chemours Teflon area
Location 10 Location 11
Total Table 3+ Concentrations
Stormwater
Chemours Fayetteville Works, North Carolina
Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C 3500 and C 295
Raleigh
December 2020
Figure
4C

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
T w ti 1" o Total Table 3+ Concentration (ng/L) 1—
ssssssmsssd
^_:sow 7, N 0
000000�000<vv�� N o 0
3 3 3 3 3 J 0 J J N O ni 3 I— 0 0 0
D N A W N 0 .Cs . D_ m 3 v 3 I--' 0 0 0 0
n. 7 r ''' m o I-s 0 0 0 0 0
1n 0=== f'1? i 0 w C iii + . •
-
L
—
—
Location 1 Location 7A Location 9 Location 10A Location 12 Location
• April 2019 ■ June 2019 ■ August 2019 ■ October 2019 ■ December 2019 January 2020
per liter
17 compound sums presented.
background concentrations. Other locations represent both stormwater and non -process wastewater from throughout the
2 for sample locations.
River Water at Facility
stormwater and non -process wastewater discharge from western portion of the Facility
non -process wastewater from Chemours Monomers Ion Exchange Materials (IXM) area and stormwater discharge from Vinyl
Vinyl Ethers North
Chemours Monomers IXM non -process wastewater and stormwater discharge
area southern drainage ditch stormwater discharge and NCCW
area northern drainage ditch stormwater discharge and NCCW
area southeast stormwater and NCCW discharge
stormwater and NCCW discharge from eastern portion of the Facility
Basin South
13 Location 14 Location 15 Location 21A
■ April 2020 May/June 2020 August 2020
Total Table 3+ Concentrations
Stormwater-Non-Contact Cooling Water
Chemours Fayetteville Works, North Carolina
,\
Geosyntec l/ Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
consultants
Figure
4 D
Raleigh
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000 -
1,000
100 -
10 -
1
Ifflu'ffl
I1 0
Location 1 Location 8
Location 22 Location 23A
• April 2019 June 2019 !August 2019 October 2019 December 2019 January 2020 ■ April 2020 • May/June 2020 ■ August 2020
Notes:
1. ng/L - nanograms per liter
2. Total Table 3+ 17 compound sums presented.
3. Location 1 represents background concentrations. Other locations represent process wastewater from non-Chemours
manufacturing areas and non -process wastewater from throughout the Facility. See Figure 2 for sample locations.
4. May/June 2020 value for Location 8 based on sample collected during dry weather in June 2020.
Location 1- Intake River Water at Facility
Location 8- Wastewater Treatment Plant (WWTP) Effluent
Locaton 22 - WWTP Influent
Location 23A - Terracotta Pipe
Total Table 3+ Concentrations
Wastewater Treatment Plant
Chemours Fayetteville Works, North Carolina
Geosyntec°
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh December 2020
Figure
4E

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000 -
1,000
100 -
10 -
1
111111 11111
Location 1 Location 7B
Location 7C Location 20
• April 2019 June 2019 August 2019 October 2019 December 2019 January 2020 ■ April 2020 • May/June 2020 ■ August 2020
Notes:
1. ng/L - nanograms per liter
2. Total Table 3+17 compound sums presented.
3. Location 1 represents background concentrations. Other locations represent process wastewater, non -process wastewater,
and stormwater from throughout the Facility. See Figure 2 for sample locations.
Location 1- Intake River Water at Facility
Location 7B - Combined stormwater and non -process wastewater from western portion of the Facility and treated discharge from
the wastewater treatment plant (WWTP)
Location 7C - Combined stormwater and non -process wastewater from western portion of the Facility, the eastern portion of the
Facility, and the DuPont Area, and treated discharge from WWTP
Location 20 - Outfall 002
Total Table 3+ Concentrations
Combined Flows to Outfall 002
Chemours Fayetteville Works, North Carolina
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NC License No.: C-3500 and C-295
Raleigh December 2020
Figure
4F

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Total Table 3+ Concentration (ng/L)
100,000
10,000
1,000
100
10
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• Intake River Water at Facility
❑ Non-Chemours Process Wastewater Locations
❑ Non -Contact Cooling Water Locations
❑ Stormwater Locations
Notes:
1. ng/L - nanograms per liter
2. Total Table 3+ 17 compound sums presented.
3. The data presented includes all samples, including field duplicates.
4. Location 10 data presented for May/June 2020 event only.
Location
❑ Stormwater-Non-Contact Cooling Water Locations
• Wastewater Treatment Plant Locations
O Combined Flows to Outfall 002 Locations
Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
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Raleigh December 2020
5A

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EPA Method 537 Mod Concentration (ng/L)
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Location
• Intake River Water at Facility ❑ Stormwater-Non-Contact Cooling Water Locations
❑ Non-Chemours Process Wastewater Locations • Wastewater Treatment Plant Locations
EPA Method 537 Mod Concentrations
❑ Non -Contact Cooling Water Locations ❑ Combined Flows to Outfall 002 Locations
Chemours Fayetteville Works, North Carolina
❑ Stormwater Locations
Notes:
1. ng/L- nanograms per liter
Geosyntec'% Geos ttec Consultants of NC, P.C.
Figure
2. Total Table 3+ 17 compound sums presented.
NC License No.: C 3500 and C 295
consultants
3. The data presented includes all samples, including field duplicates.
5B
4. Location 10 data presented for May/June 2020 event only.
Raleigh
December 2020

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Wastewater Treatment Plant Discharge
Open Channel to Outfall 002
(drains to Cape Fear River)
Legend
OTemporal Composite Sample
Grab Sample
Sample Location Category
Intake River Water at Facility
Non-Chemours Process Wastewater
Non -Contact Cooling Water (NCCW)
Stormwater
Stormwater-NCCW
Wastewater Treatment Plant
Combined Flows to Outfall 002
Ditch Type
Wood Lined Trench
Wastewater Treatment Plant Discharge
Stormwater Channel
Open Channel to Outfall 002
DuPont Area
Other Connections
QPipe Connection to Facility
Terracotta Pipe and Piping Connected to Terracotta Pipe
=Er Grouted Pipe Section
Non -Contact Cooling Water Pipe
Combined Stormwater and Non -Contact Cooling Water Pipe
Other Features
Proposed Stormwater Treatment System (See Note)
Note:
Preferred location of proposed stormwater treatment system is displayed.
Exact location is subject to change.
Stormwater treatment system will be sampled up to twice per month
under a separate program.
500 250 0 500 Feet
Paragraph 11(d) Sample Locations
Chemours Fayetteville Works, North Carolina
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Raleigh
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NC License No.: C-3500 and C-295
December 2020
Figure
6
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APPENDIX A
2020 Quarter 3 Paragraph 11(c) Scope
Methods and Results

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Appendix A
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APPENDIX A
2020 Quarter 3 Methods and Results
INTRODUCTION
Geosyntec Consultants of NC, RC.
NC License No.: C-3500 and C-295
Pursuant to Paragraph 11(c) in the executed Consent Order entered February 25, 2019 amongst
Chemours, the North Carolina Department of Environmental Quality (DEQ), and Cape Fear River
Watch, this appendix summarizes the ninth and final bimonthly sampling event in the 18-month
initial characterization period. The objective of Paragraph 11(c) is to characterize the
concentrations of per- and polyfluoroalkyl substances ("PFAS") in process wastewater, non -
process wastewater, stormwater, and the raw water intake at the Chemours Fayetteville Works,
North Carolina site (the Facility, Figure 1).
The activity period for this appendix includes 2020 Quarter 3 (July, August, September). In this
quarter, process wastewater and non -process wastewater samples were collected for the ninth and
final bimonthly sampling event in the 18-month initial characterization period. Samples were
collected during dry weather on August 26, 2020 (the August 2020 event), as outlined in the PFAS
Characterization Sampling Plan (Geosyntec, 2019a), with adjustments made based on
recommendations in prior reports (Geosyntec 2019a, 2019b, 2019c, 2020a, 2020b, and 2020c).
Results from the investigative samples in the August 2020 event are included in this appendix.
METHODS
This section describes the methods implemented for data reported in this 2020 Quarter 3 appendix.
Sample Locations
Sample locations outlined in the PFAS Characterization Sampling Plan (Geosyntec, 2019a) are
described in Table 1 and shown in Figure 2 of the main body of the report. Sample locations that
have been added to the Sampling Plan based on recommendations made in previous reports are
also identified in Table 1 and shown in Figure 2.
In the August 2020 event, investigative samples were collected from twenty-three (23) locations
listed in Table 2. Locations 2, 3, 4, 5, 10, 11, 12, and 13 were not sampled for the August 2020
event as there was insufficient water at these locations because the event occurred during a dry
period.
During each sampling event, either Location 21A or 21B (the south and north sediment ponds) is
sampled depending on which sediment pond is active. Consistent with previous sampling events,
the south sediment pond (Location 21A) was active during the August 2020 event and a sample
was collected from this pond.
1 December 2020

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Field Methods
General Field Methods
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All equipment was inspected by the field program supervisor and calibrated daily prior to use in
the field, according to the manufacturer's recommendations. Field parameters were measured with
a water quality meter prior to sample collection and then recorded. Field parameters include the
following:
• pH;
• Temperature (degrees Celsius; °C);
• Specific conductance [SC] (micromhos, µmho);
• Dissolved oxygen [DO] (milligrams per liter; mg/L);
• Oxidation/Reduction Potential [ORP] (millivolts; mV);
• Turbidity (nephelometric turbidity units, NTU);
• Color; and
• Odor.
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 labelled with a unique sample identification number, date, time and
location of sampling, and the initials of the individual collecting the sample. A field notebook and
location -specific field forms were used to record information regarding additional items such as
quality assurance/ quality control (QA/QC), sample identifications, color, odor, turbidity, and
other field parameters.
Decontamination Methods
Sample containers were new and used only once for each sample. Disposable equipment (e.g.,
gloves, tubing, etc.) was not reused; these items did not require decontamination.
All non -dedicated or non -disposable sampling equipment (i.e., the autosampler reservoir and dip
rod) 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.
If there was a delay between decontamination and sample collection, decontaminated sampling
equipment was covered with PFAS-free plastic until it was ready for use.
2 December 2020

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Grab Sampling Methods
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Grab samples were collected from locations where temporal variability over the course of one day
was not expected. These locations include non -process wastewater only locations (Locations 6A,
6B, 24A, 24B, and 24C), select process wastewater only locations (Locations 19A and 19B), and
the Sediment Basin South location (Location 21A), as identified in Table 2 and shown on Figure
2 of the main body of the report. All grab samples were collected by directly filling the HDPE
bottle with the sample. Prior to grab sample collection, field parameters were measured using a
flow through cell for all grab sample locations.
Temporal Composite Sampling Methods
Temporal composite samples were collected during the bimonthly sampling events from locations
where variability was expected to potentially be significant within a short time frame (e.g., one
day). These locations, identified in Table 2 and shown on Figure 2 of the main body of the report,
include those within the Facility conveyance network and the intake and outfall locations, since
these locations can have highly variable dissolved and suspended constituent loads over short time
periods. Temporal composite samples were collected using a dedicated Teledyne 6712C
autosampler equipped with a rain gauge, HDPE tubing, silicon tubing, and an HDPE sample
reservoir. Field parameters were measured once during composite sampling (collected directly
from the water stream). During the sampling event, autosamplers generally integrated water over
a four-hour sample collection period.
Sample Shipping, Chain of Custody, and Holding Times
Upon sample collection, each labelled, containerized sample was placed into a 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. COCs were
signed by the field personnel relinquishing the samples to the courier and was signed by the
laboratory upon receipt of the cooler.
Field QA/QC Samples
The following field QA/QC samples were collected and analyzed along with the August 2020
investigative samples:
• Two blind field duplicates;
• Three equipment blanks for the dip rod, autosampler, and peristaltic pump;
• One field blank; and
• One trip blank.
3 December 2020

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Appendix A
Documentation
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The project field team kept a daily record of field activities during the execution of field work
including sampling notes and observations documented on field forms, instrument calibration
records, measured field parameters, sample COC, and shipping records.
Laboratory Methods
Analytical Methods
Samples were analyzed for PFAS by the following methods:
• 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 3.
Laboratory and Field QA/QC
Field sampling and laboratory analyses were performed largely in accordance with the PFAS
Characterization Sampling Plan (Geosyntec, 2019a). Samples were collected by the field team and
shipped to TestAmerica Sacramento (TestAmerica) 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), trip blanks, and equipment
blanks was conducted in accordance with the PFAS Characterization Sampling Plan (Geosyntec,
2019a).
RESULTS — AUGUST 2020 EVENT
This section describes the data quality, field parameter data, and investigative sample results
from the August 2020 event. PFAS concentrations for all sample locations in the August 2020
event are provided in Table Al. Table A2 provides the total daily precipitation in the area of the
Facility and the flow measured at Outfall 002 at the times of sampling events discussed in this
report. Field parameters recorded during the August 2020 event are provided in Table A3.
Data Quality
All data from the August 2020 event 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 Labelling 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.
4 December 2020

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Appendix A
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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 in the August 2020 event, as warranted:
• J — Analyte present. Reported value may not be accurate or precise;
• UJ — Analyte not detected. Reporting limit may not be accurate or precise; and
• R — Reject. The presence or absence of the analyte cannot be verified.
The data review process described above was performed for all laboratory chemical analytical data
generated for the sampling event. The DQOs were met for the analytical results for accuracy and
precision. The data collected during the August 2020 event are believed to be complete,
representative and comparable, with the exception of R-PSDA1, Hydrolyzed PSDA2, and R-EVE3.
As reported in the (Geosyntec, 2020d), studies have shown that the quantitation of R-PSDA,
Hydrolyzed PSDA, and R-EVE is inaccurate due to interferences by the sample matrix in both
groundwater and surface water. Given the matrix interference issues, total Table 3+ PFAS
concentrations can be calculated and presented in two ways: (i) summing over 17 of the 20 Table
3+ compounds, i.e., excluding results of R-PSDA, Hydrolyzed PSDA, and R-EVE, and (ii)
summing over 20 of the Table 3+ compounds. Expressing these data as a range represents possible
values of what these results might be without matrix interferences.
Because of this known matrix interference, results for R-PSDA, Hydrolyzed PSDA, and R-EVE
have been J-qualified for the August 2020 event (Table Al) and retrospectively for all events
(Appendix C).
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
1 R-PSDA: 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-2-sulfoethoxy)-pentanoic acid
2 Hydrolyzed PSDA: 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-tetrafluoro-2-sulfoethoxy)propoxy]-acetic acid
3 R-EVE: 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-2,2,3,3,4,5,5,5-octafluoro-pentanoic acid
5 December 2020

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Appendix A
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Geosyntec Consultants of NC, RC.
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qualification of data are performed by AECOM who maintains the EIM system for the Chemours
Fayetteville Site. Whitebooks consisting of the data review narratives and the laboratory analytical
reports produced by AECOM summarize the findings of the DVM and manual review process.
QA/QC Samples
PFAS concentrations for all field QA/QC samples in the August 2020 event are reported in Table
4. The following observations were noted for the QA/QC samples:
• The RPD for field duplicate pairs in the August 2020 event were generally less than 30%
for all PFAS. Where RPDs were greater than 30%, the reported results may be imprecise
and were J qualified, indicating the results are estimated.
• No PFAS were detected above the associated reporting limits in the August 2020
Equipment Blanks (3), Trip Blank, or Field Blank.
August 2020 Event Field Parameter Data
Field parameters recorded during the August 2020 event are provided in Table A3 for grab
samples and temporal composite samples. Field parameters were measured using a Horiba U-52
model. The water quality meter was calibrated at the start of every sampling day.
For grab samples, field parameters were measured once prior to sampling using a flow through
cell. For temporal composite samples once during composite sampling and collected directly
from the water stream.
Recorded field parameter data observed during the August 2020 event are generally in
accordance with expectations for the sample locations, with the following exceptions:
• Most locations had recorded pH between 5 and 10. Location 22, the combined influent to
the wastewater treatment plant (WWTP), had pH greater than 10.
• Most locations had recorded DO between 5 and 9 mg/L. Location 14, the DuPont area
southeast stormwater and non -contact cooling water (NCCW) discharge, had the highest
DO measurements at 8.4 mg/L.
• Most locations had recorded ORP between 20 and 100 mV. Location 10A, the Combined
Chemours Monomers IXM NCCW and stormwater discharge, had the lowest ORP reading
at -7.1 mV. Location 21A, the Sediment Basin South, had the highest ORP reading at 179
mV.
• Most locations had recorded Turbidity between 0 and 100 NTU. Location 6A, the Kuraray
southern leased area NCCW discharge - Resins Area; Location 19B, the DuPont process
wastewater - Plant 2; and Location 21A, the Sediment Basin South all had Turbidity
measurements greater than 100 NTU at 149, 237, and 679 NTU respectively.
6 December 2020

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Appendix A
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August 2020 Event Investigative Sample Results
Geosyntec Consultants of NC, RC.
NC License No.: C-3500 and C-295
PFAS concentrations for all sample locations in the August 2020 event are provided in Table Al.
Table A2 provides the total daily precipitation in the area of the Facility and the flow measured at
Outfall 002 at the times of sampling events discussed in this report. The analytical reporting limits
associated with the August 2020 data were determined by the laboratories. TestAmerica analytical
reports and the data review narrative whitebooks are provided as Attachment A to this appendix.
Trends and observations from the August 2020 event were generally consistent with previous
sampling events and are interpreted in conjunction with the entire dataset for the 18-month initial
characterization period in the main body of the report.
REFERENCES
Environmental Protection Agency (EPA), 2009. Guidance for Labelling Externally Validated
Laboratory Analytical Data for Superfund Use. Office of Solid Waste and Emergency Response.
OSWER No. 9200.1-85, EPA-540-R-08-005
Geosyntec, 2019a. PFAS Characterization Sampling Plan. May 6, 2019.
Geosyntec, 2019b. Characterization of PFAS in Process and Non -Process Wastewater and
Stormwater: Quarterly Report #1. July 31, 2019.
Geosyntec, 2019c. Characterization of PFAS in Process and Non -Process Wastewater and
Stormwater: Quarterly Report #2. October 31, 2019.
Geosyntec, 2019d. Assessment of HFPO-DA and PFMOAA in Outfall 002 Discharge and
Evaluation of Potential Control Options. August 2019.
Geosyntec, 2020a. Characterization of PFAS in Process and Non -Process Wastewater and
Stormwater: Quarterly Report #3. January 31, 2020.
Geosyntec, 2020b. Characterization of PFAS in Process and Non -Process Wastewater and
Stormwater: Quarterly Report #4. April 30, 2020.
Geosyntec, 2020c. Characterization of PFAS in Process and Non -Process Wastewater and
Stormwater: Quarterly Report #5. July 31, 2020.
Geosyntec, 2020d. Matrix Interference During Analysis of Table 3+ Compounds. Chemours
Fayetteville Works. July 31, 2020.
7 December 2020

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TABLES

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TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
1
6A
6B
7A
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-1-4-082620
STW-LOC-6A-082620
STW-LOC-6B-082620
STW-LOC-7A-4-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ SOP (ng/L)
HFPODA
13
21
27
14
PFMOAA
5.0
24
31
5.2
PFO2HxA
14
23
32
13
PFO3OA
2.5
3.4
4.7
2.0
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
60
80
53
57
PEPA
<10
<10
<10
<10
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
3.0
10
<2
3.2
R-PSDCA
<2
<2
<2
<2
NVHOS
6.5
<2
<2
6.5
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)*
100
150
150
98
Total Table 3+ (20 compounds)*
100
160
150
100
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-1-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.1
4.2
4.6
4.0
Perfluorobutanoic Acid
4.3
5.5
5.9
4.4
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.0
3.3
3.4
3.2
Perfluorohexadecanoic acid (PFHxDA)
--
--
--
--
Perfluorohexane Sulfonic Acid
3.6
4.1
3.8
4.1
Perfluorohexanoic Acid
7.1
7.5
7.5
6.8
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
7.1
7.9
8.1
6.7
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
5.1
6
5.6
5.8
PFOS
7.4
11
9.7
10
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 1 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7B
7C
8
9
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-7B-4-082620
STW-LOC-7C-4-082620
STW-LOC-8-4-082620
STW-LOC-9-4-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ SOP (ng/L)
HFPODA
20
24
96
51
PFMOAA
41
36
470
5.7
PFO2HxA
27
23
200
15
PFO3OA
6.3
5.4
50
3.8
PFO4DA
4.8
<2
17
<2
PFO5DA
5.2
<2
17
<2
PMPA
56
63
52
40
PEPA
<10
<10
15
<10
PS Acid
<2
26
<2
100
Hydro -PS Acid
7.1
6.6
77
8.9
R-PSDA
<2
<2
18
58
Hydrolyzed PSDA
70
110
200
320
R-PSDCA
<2
<2
2.1
<2
NVHOS
8.5
8.0
30
3.2
EVE Acid
<2
14
5.8
71
Hydro -EVE Acid
<2
10
6.1
55
R-EVE
10
11
17
19
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)*
180
220
1,000
350
Total Table 3+ (20 compounds)*
260
340
1,300
750
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.9
3.6
4.2
4.3
Perfluorobutanoic Acid
3.8
3.9
5.8
6.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.5
3.3
4.6
4.2
Perfluorohexadecanoic acid (PFHxDA)
--
--
--
--
Perfluorohexane Sulfonic Acid
4.2
4.00
2.7
4.5
Perfluorohexanoic Acid
6.8
6.9
8.4
7.0
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
7.4
7.8
17
13
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.1
5.9
9.4
6.2
PFOS
9.9
9.8
<2
12
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 2 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
10A
12
14
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-10A-4-082620
STW-LOC-12-4-082620
STW-LOC-12-4-082620
STW-LOC-14-4-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ SOP (ng/L)
HFPODA
56
21
20
19
PFMOAA
<4
12 J
12
8.7
PFO2HxA
15
21
22
17
PFO3OA
2.4
3.6
3.9
2.5
PFO4DA
<3
<2
<2
<2
PFO5DA
<3.9
<2
<2
<2
PMPA
<31
52
52
51
PEPA
<10
<10
<10
<10
PS Acid
160
<2
<2
<2
Hydro -PS Acid
12
<2
<2
<2
R-PSDA
34
23 J
<2 UJ
<2
Hydrolyzed PSDA
340
4.1 J
4.0
3.2
R-PSDCA
<2
<2
<2
<2
NVHOS
2.6
11 J
<2 UJ
8.9
EVE Acid
72
<2
<2
<2
Hydro -EVE Acid
49
<2
<2
<2
R-EVE
9.9
7.4 J
<2 UJ
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2.4
<2
<2
<2
Total Table 3+ (17 compounds)*
370
120
120
110
Total Table 3+ (20 compounds)*
750
160
160
110
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.3
6.9
6.5
6.1
Perfluorobutanoic Acid
6.4
8.3
8.1
7.8
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.8
6.3
6.1
5.8
Perfluorohexadecanoic acid (PFHxDA)
--
--
--
--
Perfluorohexane Sulfonic Acid
4.2
6.5
6.2
6.2
Perfluorohexanoic Acid
7.4
12
12
11
Perfluorononanesulfonic acid
<2
<2 UJ
<2
<2
Perfluorononanoic Acid
<2
2.1
2.0
<2
Perfluorooctadecanoic acid
<2 UJ
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
12
14
14
12
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2 UJ
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.3
11
10
10
PFOS
12
19
18
17
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 3 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
15
18
19A
19B
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-15-4-082620
STW-LOC-18-4-082620
STW-LOC-19A-082620
STW-LOC-19B-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ SOP (ng/L)
HFPODA
51
9.5
4.2
4.7
PFMOAA
<2
<2
5.5
<2
PFO2HxA
7.3
2.8
4.9
6.2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<20
<20
<20
<20
PEPA
<10
<10
<10
<10
PS Acid
51
<2
3.1
<2
Hydro -PS Acid
3.8
<2
<2
<2
R-PSDA
15
10
<2
<2
Hydrolyzed PSDA
150
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
27
<2
<2
<2
Hydro -EVE Acid
18
<2
<2
<2
R-EVE
3.4
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)*
160
12
18
11
Total Table 3+ (20 compounds)*
330
22
18
11
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2 UJ
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2 UJ
ADONA
--
--
--
--
DONA
<2
<2
<2
<2 UJ
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2 UJ
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2 UJ
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.2
<2
<2
<2
Perfluorobutanoic Acid
6.8
4.8 J
<2
2.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2 UJ
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2 UJ
Perfluoroheptanoic Acid
4.1
2.4
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
--
--
--
<8
Perfluorohexane Sulfonic Acid
4.3
<2
<2
<2 UJ
Perfluorohexanoic Acid
7.6
2.3
2.5
2.9
Perfluorononanesulfonic acid
<2
<2
<2
<2 UJ
Perfluorononanoic Acid
<2
<2
<2
<2 UJ
Perfluorooctadecanoic acid
<2
<2 UJ
<2 UJ
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2 UJ
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
13
3.3
2.9
3.9
Perfluorotetradecanoic Acid
<2
<2
<2
<2 UJ
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.4
2.5
2.7
3.4 J
PFOS
12
4.4
<2
2.1 J
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 4 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
20
21A
22
23A
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-20-4-042820
STW-LOC-21A-082620
STW-LOC-22-4-082620
STW-LOC-23A-2-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ SOP (ng/L)
HFPODA
57
16
99 J
69
PFMOAA
<2
<2
<2
520
PFO2HxA
14
14
16
110
PFO3OA
3.2
2.2
5.6
44
PFO4DA
<2
<2
7.6
<30
PFO5DA
<2
<2
6.4
<39
PMPA
<20
23
<20
<310
PEPA
<10
<10
<10
<10
PS Acid
24
<2
19
6,000
Hydro -PS Acid
4.0
<2
59
230
R-PSDA
12
<2
270
160
Hydrolyzed PSDA
86
4.2
1,200
2,500
R-PSDCA
<2
<2
2.7
<8.7
NVHOS
<2
<2
14
24
EVE Acid
12
<2
33
47
Hydro -EVE Acid
9.6
<2
14
7.4
R-EVE
4.8
<2
330
<36
PES
<2
<2
<2
<3.4
PFECA B
<2
<2
<2
<13
PFECA-G
<2
<2
<2
<24
Total Table 3+ (17 compounds)*
150
55
280
7,100
Total Table 3+ (20 compounds)*
260
59
2,100
9,700
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20 UJ
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
2.9
2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.1
4.6
2.4
4.4
Perfluorobutanoic Acid
6.0
5.8
<2 R
20
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
2.0
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
4.1
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.8
3.6
2.1
4.6
Perfluorohexadecanoic acid (PFHxDA)
--
<2
--
--
Perfluorohexane Sulfonic Acid
4.2
4.2
<2
3.8
Perfluorohexanoic Acid
7.1
7.3
3.7 J
8.3
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2 UJ
<2
Perfluorooctane Sulfonamide
<2
<2
<2
2.1
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
10
9.1
15 J
11
Perfluorotetradecanoic Acid
<2
<2
<2
3.4
Perfluorotridecanoic Acid
<2
<2
<2
3.7
Perfluoroundecanoic Acid
<2
<2
<2
2.4
PFOA
6.2
6.5
4.0
23
PFOS
11
5.4
4.7
17
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 5 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23B
24A
24B
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-23B-082620
STW-LOC-24A-082620
STW-LOC-24A-082620-D
STW-LOC-24B-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ SOP (ng/L)
HFPODA
25
28
30
15
PFMOAA
<2
18 J
18
<2
PFO2HxA
18
26 J
14 J
13
PFO3OA
2.8
4.1
2.2
2.1
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
32
53 J
21 J
22
PEPA
<10
18 J
<10
<10
PS Acid
33
<2
<2
<2
Hydro -PS Acid
2.0
<2
<2
<2
R-PSDA
<2
<2
2.5
15
Hydrolyzed PSDA
35
7.9 J
4 J
5.5
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
35 J
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)*
110
150
85
52
Total Table 3+ (20 compounds)*
150
190
92
73
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11 Cl-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.4
4.3
4.5
4.1
Perfluorobutanoic Acid
5.5
6.1
6.2
5.3
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.6
3.5
3.3
3.3
Perfluorohexadecanoic acid (PFHxDA)
<2
--
--
<2
Perfluorohexane Sulfonic Acid
4.0
4.3
4.3
4.1
Perfluorohexanoic Acid
7.5
7.2
7.7
6.7
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
7.9
8.7
8.2
8.0
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.9
6.6
6.3
6.0
PFOS
12
13
11
12
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 6 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24C
EB
EB EB
Sample Event
August 2020
August 2020
August 2020
August 2020
Field Sample ID
STW-LOC-24C-082620
STW-EQBLK-DR-082620
STW-EQBLK-IS-082620
STW-EQBLK-PP-082620
Date Sampled
8/26/2020
8/26/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ SOP (ng/L)
HFPODA
14
<4
<4
<4
PFMOAA
7.4
<2
<2
<2
PFO2HxA
13
<2
<2
<2
PFO3OA
2.1
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
47
<20
<20
<20
PEPA
<10
<10
<10
<10
PS Acid
2.7
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
20
<2
<2
<2
Hydrolyzed PSDA
14
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
7.5
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
11
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)*
94
ND
ND
ND
Total Table 3+ (20 compounds)*
140
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11 Cl-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-1-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- 1 -octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.0
<2
<2
<2
Perfluorobutanoic Acid
4.8
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.3
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
--
--
--
--
Perfluorohexane Sulfonic Acid
4.0
<2
<2
<2
Perfluorohexanoic Acid
6.5
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
7.2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
5.5
<2
<2
<2
PFOS
9.2
<2
<2
<2
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 7 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE Al
ANALYTICAL RESULTS - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
FBLK
TB
Sample Event
August 2020
August 2020
Field Sample ID
STW-FBLK-082620
STW-TBLK-082620
Date Sampled
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
QA/QC
Field Blank
Trip Blank
Table 3+ SOP (ng/L)
HFPODA
<4
<4
PFMOAA
<2
<2
PFO2HxA
<2
<2
PFO3OA
<2
<2
PFO4DA
<2
<2
PFO5DA
<2
<2
PMPA
<20
<20
PEPA
<10
<10
PS Acid
<2
<2
Hydro -PS Acid
<2
<2
R-PSDA
<2
<2
Hydrolyzed PSDA
<2
<2
R-PSDCA
<2
<2
NVHOS
<2
<2
EVE Acid
<2
<2
Hydro -EVE Acid
<2
<2
R-EVE
<2
<2
PES
<2
<2
PFECA B
<2
<2
PFECA-G
<2
<2
Total Table 3+ (17 compounds)*
ND
ND
Total Table 3+ (20 compounds)*
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
11 Cl-PF3OUdS
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
9C1-PF3ONS
<2
<2
ADONA
--
--
DONA
<2
<2
NaDONA
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2
N-methyl perfluoro-1-octanesulfonamide
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
Perfluorobutanoic Acid
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
Perfluorodecanoic Acid
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
Perfluorododecanoic Acid
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
Perfluoroheptanoic Acid
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
--
--
Perfluorohexane Sulfonic Acid
<2
<2
Perfluorohexanoic Acid
<2
<2
Perfluorononanesulfonic acid
<2
<2
Perfluorononanoic Acid
<2
<2
Perfluorooctadecanoic acid
<2
<2
Perfluorooctane Sulfonamide
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
Perfluoropentanoic Acid
<2
<2
Perfluorotetradecanoic Acid
<2
<2
Perfluorotridecanoic Acid
<2
<2
Perfluoroundecanoic Acid
<2
<2
PFOA
<2
<2
PFOS
<2
<2
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -
detect data. The total Table 3+ sum is rounded to two significant figures.
Locations sampled in August 2020 were collected on August 26, 2020.
Bold - Analyte detected above associated reporting limit
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
R - Reject. The present or absence of the analyte cannot be verified.
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.
TR0795A Page 8 of 8 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE A2 Geosyntec Consultants of NC, P.C.
TOTAL DAILY PRECIPITATION - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Date
Total Precipitation (inches)
Measured Outfall Flow
(MGD)
7/1/2020
0.02
21
7/2/2020
--
22
7/3/2020
--
22
7/4/2020
--
19
7/5/2020
--
21
7/6/2020
--
21
7/7/2020
0.13
21
7/8/2020
0.03
22
7/9/2020
0.03
21
7/10/2020
1.03
26
7/11/2020
0.02
20
7/12/2020
--
21
7/13/2020
0.68
21
7/14/2020
--
21
7/15/2020
--
21
7/16/2020
--
20
7/17/2020
--
21
7/18/2020
--
21
7/19/2020
--
20
7/20/2020
0.68
22
7/21/2020
--
22
7/22/2020
--
21
7/23/2020
1.2
23
7/24/2020
0.14
21
7/25/2020
--
21
7/26/2020
--
21
7/27/2020
--
21
7/28/2020
0.01
--
7/29/2020
0.01
--
7/30/2020
--
--
7/31/2020
--
--
8/1/2020
--
20
8/2/2020
--
20
8/3/2020
1.84
27
8/4/2020
0.36
21
8/5/2020
--
20
8/6/2020
0.02
21
8/7/2020
1.08
22
8/8/2020
0.01
19
8/9/2020
0.07
20
8/10/2020
1.1
24
8/11/2020
0.01
20
8/12/2020
--
19
8/13/2020
--
20
8/14/2020
0.05
20
8/15/2020
0.47
20
8/16/2020
--
18
8/17/2020
0.81
22
8/18/2020
--
20
8/19/2020
0.22
20
8/20/2020
0.17
20
TR0795A Page 1 of 2 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE A2 Geosyntec Consultants of NC, P.C.
TOTAL DAILY PRECIPITATION - 2020 QUARTER 3
Chemours Fayetteville Works, North Carolina
Date
Total Precipitation (inches)
Measured Outfall Flow
(MGD)
8/21/2020
0.06
19
8/22/2020
--
17
8/23/2020
--
18
8/24/2020
0.2
18
8/25/2020
--
19
8/26/2020
--
II MI ,
8/27/2020
0.01
19
8/28/2020
--
21
8/29/2020
0.04
16
8/30/2020
--
17
8/31/2020
0.02
17
9/1/2020
--
17
9/2/2020
--
16
9/3/2020
--
16
9/4/2020
--
16
9/5/2020
--
16
9/6/2020
--
16
9/7/2020
--
16
9/8/2020
0.02
14
9/9/2020
0.37
17
9/10/2020
--
16
9/11/2020
0.65
16
9/12/2020
--
16
9/13/2020
--
15
9/14/2020
--
15
9/15/2020
--
16
9/16/2020
0.02
16
9/17/2020
1.69
22
9/18/2020
0.09
15
9/19/2020
--
15
9/20/2020
--
17
9/21/2020
--
16
9/22/2020
--
16
9/23/2020
--
16
9/24/2020
--
16
9/25/2020
2
24
9/26/2020
0.01
16
9/27/2020
0.02
17
9/28/2020
0.02
17
9/29/2020
22
9/30/2020
0.01
16
Notes:
Precipitation data obtained from USGS rain gauge at W.O. Huske Dam.
MGD - million gallons per day
USGS - United States Geological Survey
- below USGS measurement threshold
72 hour period prior to sample collection date
Sample collection date
TR0795A Page 2 of 2 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE A3
FIELD PARAMETERS - 2020 QUARTER 3 - AUGUST 2020 EVENT
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location
Sampling Method
pH
Temperature (°C)
Specific Conductivity
(mS/cm)
Dissolved Oxygen
(mg/L)
ORP
(mV)
Turbidity
(NTU)
1
Temporal Composite
8.3
30
0.3
5.0
25
18
6A
Grab
8.0
32
2.4
0.0
47
149
6B
Grab
7.7
33
0.3
6.2
31
106
7A
Temporal Composite
8.2
31
0.2
6.9
10
19
7B
Temporal Composite
8.2
31
0.3
6.6
3.6
15
7C
Temporal Composite
8.0
32
0.2
6.6
21
31
8
Temporal Composite
8.2
33
2.9
0.4
51
5.7
9
Temporal Composite
8.1
31
0.2
5.8
18
29
10A
Temporal Composite
8.5
30
0.5
5.4
-7.1
29
12
Temporal Composite
8.2
33
0.7
5.9
54
2.0
14
Temporal Composite
8.6
34
0.7
8.4
71
14
15
Temporal Composite
7.7
32
0.1
6.8
30
51
18
Temporal Composite
9.1
31
0.7
6.5
34
49
19A
Grab
7.3
40
0.1
5.6
49
21
19B
Grab
7.6
39
0.2
7.0
40
237
20
Temporal Composite
7.9
32
0.2
7.4
39
12
21A
Grab
5.7
38
0.1
1.5
179
679
22
Temporal Composite
10.2
33
2.0
6.1
5.1
98
23A
Temporal Composite
7.9
30
1.1
2.5
31
1.5
23B
Grab
8.2
34
0.4
5.8
27
3.4
24A
Grab
6.9
30
0.2
7.5
78
18
24B
Grab
7.3
31
0.2
7.1
77
1.2
24C
Grab
7.5
35
0.2
6.6
58
2.0
Notes:
°C - degrees Celsius
mg/L - milligrams per liter
mS/cm - milliSiemens per centimeter
mV - millivolt
NTU - nephelometric turbidity units
ORP - oxidation reduction potential
Field parameters for the temporal composite samples were collected during sampling directly from the water stream only.
TR0795A Page 1 of 1 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
ATTACHMENT A
Laboratory Reports and Data Review
Narrative Whitebooks
Laboratory reports are provided on a USB
memory storage drive that was shipped with
the hard copies provided to NCDEQ

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
ADQM DATA REVIEW
NARRATIVE
Site Chemours FAY — Fayetteville
Project Stormwater Sampling 8/20
Project Reviewer Michael Aucoin, AECOM as a Chemours contractor
Sampling Dates August 26, 2020
Analytical Protocol
Laboratory
Analytical Method
Parameter(s)
TestAmerica - Sacramento
537 Modified
PFAS1
TestAmerica - Sacramento
Cl. Spec. Table 3
Compound SOP
Table 3+ compounds
1 Perfluoroalkylsubstances, a list of 35 compounds including HFPO-DA.
Sample Receipt
The following items are noted for this data set:
• All samples were received in satisfactory condition and within EPA temperature guidelines on
August 28, 2020.
Data Review
The electronic data submitted for this project was reviewed via the Data Verification Module (DVM)
process.
Overall the data is acceptable for use without qualification, except as noted below:
• The non -detect result for PFBA in one sample was qualified R and should be considered to be
unusable due to a very poor surrogate (isotope dilution analyte) recovery.
• Several analytical results have been qualified J as estimated, and non -detect results qualified UJ
indicating an estimated reporting limit, due to poor recovery of a surrogate or matrix spike, a
transition mass ratio for the indicated analyte outside of the established ratio limits, and; poor
field duplicate precision. See the Data Verification Module (DVM) Narrative Report for which
samples were qualified, the specific reasons for qualification, and potential bias in reported
results.
Attachments
The DVM Narrative report is attached. The lab reports due to a large page count are stored on an
AECOM network shared drive and are available to be posted on external shared drives, or on a flash
drive.
ADQM Data Review Narrative - FAY Stormwater Samp 820.doc 1 of 2

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Data Verification Module (DVM)
The DVM is an internal review process used by the ADQM group to assist with the determination of data
usability. The electronic data deliverables received from the laboratory are loaded into the Locus EIMTM
database and processed through a series of data quality checks, which are a combination of software
(Locus EIIVITM database Data Verification Module (DVM)) and manual reviewer evaluations. The data is
evaluated against the following data usability checks:
• Field and laboratory blank contamination
• US EPA hold time criteria
• Missing Quality Control (QC) samples
• Matrix spike(MS)/matrix spike duplicate (MSD) recoveries and the relative percent differences
(RPDs) between these spikes
• Laboratory control sample(LCS)/control sample duplicate (LCSD) recoveries and the RPD
between these spikes
• Surrogate spike recoveries for organic analyses
• RPD between field duplicate sample pairs
• RPD between laboratory replicates for inorganic analyses
• Difference / percent difference between total and dissolved sample pairs.
There are two qualifier fields in EIM:
Lab Qualifier is the qualifier assigned by the lab and may not reflect the usability of the data. This
qualifier may have many different meanings and can vary between labs and over time within the same
lab. Please refer to the laboratory report for a description of the lab qualifiers. As they are lab
descriptors they are not to be used when evaluating the data.
Validation Qualifier is the 3rd party formal validation qualifier if this was performed. Otherwise this
field contains the qualifier resulting from the ADQM DVM review process. This qualifier assesses
the usability of the data and may not equal the lab qualifier. The DVM applies the following data
evaluation qualifiers to analysis results, as warranted:
Qualifier
Definition
B
Not detected substantially above the level reported in the laboratory
or field blanks.
R
Unusable result. Analyte may or may not be present in the sample.
J
Analyte present. Reported value may not be accurate or precise.
UJ
Not detected. Reporting limit may not be accurate or precise.
The Validation Status Code field is set to "DVM" if the ADQM DVM process has been performed. If the DVM
has not been run, the field will be blank.
If the DVM has been run (Validation Status Code equals "DVM"), use the Validation Qualifier.
ADQM Data Review Narrative - FAY Stormwater Samp 820.doc 2 of 2

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville
DVM Narrative Report
Sampling Program: STORMWATER SAMPLING 8/20 Validation Options: LABSTATS
Validation Reason One or more surrogates had relative percent recovery (RPR) values less than the data rejection level. The reported result is unusable.
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-22-4-082620 08/26/2020 320-64117-4 Perfluorobutanoic Acid 0.0020 UG/L PQL 0.0020 R 537 Modified 3535 PFC
Page 1 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason High relative percent difference (RPD) observed between field duplicate and parent sample. The reported result may be imprecise.
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-12-4-082620-D 08/26/2020 320-64096-2 NVHOS 0.0020 UG/L PQL 0.0020 UJ Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-12-4-082620-D 08/26/2020 320-64096-2 R-PSDA 0.0020 UG/L PQL 0.0020 UJ Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-12-4-082620-D 08/26/2020 320-64096-2 R-EVE 0.0020 UG/L PQL 0.0020 UJ Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
Page 2 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason
Only one surrogate has relative percent recovery (RPR) values outside control limits and the parameter is a PFC (Nondetects).
Field Sample ID
STW-LOC-22-4-082620
STW-LOC-10A-4-082620
STW-LOC-18-4-082620
STW-LOC-19A-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-19B-082620
STW-LOC-22-4-082620
Date
Sampled Lab Sample ID Analyte
08/26/2020 320-64117-4
08/26/2020 320-64093-3
08/26/2020 320-64117-2
08/26/2020 320-64119-4
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64118-1
08/26/2020 320-64117-4
1 H,1 H,2H,2H-
perfluorohexanesulfon
ate (4:2 FTS)
Perfluorooctadecanoic
acid
Perfluorooctadecanoic
acid
Perfluorooctadecanoic
acid
N-methyl perfluoro-1-
octanesulfonamide
Perfluorohexane
Sulfonic Acid
Perfluoroheptane
sulfonic acid (PFHpS)
Perfluorononanoic
Acid
Perfluorotetradecanoic
Acid
N-ethylperfluoro-1-
octanesulfonamide
Perfluorononanesulfon
is acid
Perfluorooctane
Sulfonamide
9CI-PF3ONS
11 CI-PF3OUdS
Perfluorododecane
sulfonic acid (PFDoS)
DONA
Perfluorooctadecanoic
acid
Validation Analytical
Result Units Type MDL PQL Qualifier Method Pre -prep
0.020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 UG/L PQL
0.0020 ug/L PQL
0.0020 UG/L PQL
0.0020 UG/L PQL
0.0020 UG/L PQL
0.0020 ug/L PQL
0.0020 UG/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.0020 ug/L PQL
0.020 UJ 537 Modified
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
0.0020
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
UJ 537 Modified
Prep
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
3535_PFC
Page 3 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason Associated MS and/or MSD analysis had relative percent recovery (RPR) values less than the lower control limit. The actual detection limits may be
higher than reported.
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-12-4-082620 08/26/2020 320-64096-1 Perfluorononanesulfon 0.0020 ug/L PQL 0.0020 UJ 537 Modified 3535_PFC
is acid
STW-LOC-12-4-082620 08/26/2020 320-64096-1 Perfluorotridecanoic 0.0020 UG/L PQL 0.0020 UJ 537 Modified 3535_PFC
Acid
Page 4 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason
Associated MS and/or MSD analysis had relative percent recovery (RPR) values higher than the upper control limit. The reported result may be biased
high.
Field Sample ID
STW-LOC-12-4-082620
STW-LOC-12-4-082620
STW-LOC-12-4-082620
STW-LOC-12-4-082620
STW-LOC-24A-082620
STW-LOC-24A-082620
Date
Sampled Lab Sample ID Analyte
08/26/2020 320-64096-1 R-PSDA
08/26/2020 320-64096-1
08/26/2020 320-64096-1
08/26/2020 320-64096-1
08/26/2020 320-64103-1
08/26/2020 320-64103-1
Hydrolyzed PSDA
Hydrolyzed PSDA
R-EVE
Hydrolyzed PSDA
R-EVE
Result Units Type
0.023 UG/L PQL
0.0041 UG/L PQL
0.0038 UG/L PQL
0.0074 UG/L PQL
0.0079 UG/L PQL
0.035 UG/L PQL
Validation Analytical
MDL PQL Qualifier Method Pre -prep
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
Page 5 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason High relative percent difference (RPD) observed between field duplicate and parent sample. The reported result may be imprecise.
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-12-4-082620 08/26/2020 320-64096-1 NVHOS 0.011 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-12-4-082620 08/26/2020 320-64096-1 NVHOS 0.012 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-12-4-082620 08/26/2020 320-64096-1 R-PSDA 0.025 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-12-4-082620 08/26/2020 320-64096-1 R-EVE 0.0071 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PMPA 0.053 UG/L PQL 0.020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PMPA 0.045 UG/L PQL 0.020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 Hydrolyzed PSDA 0.0084 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 R-EVE 0.035 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PEPA 0.018 UG/L PQL 0.010 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PEPA 0.023 UG/L PQL 0.010 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PFO2HxA 0.026 ug/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620 08/26/2020 320-64103-1 PFO2HxA 0.027 ug/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620-D 08/26/2020 320-64103-2 PMPA 0.021 UG/L PQL 0.020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620-D 08/26/2020 320-64103-2 Hydrolyzed PSDA 0.0040 UG/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
STW-LOC-24A-082620-D 08/26/2020 320-64103-2 PFO2HxA 0.014 ug/L PQL 0.0020 J Cl. Spec. Table 3 PFAS_DI_Prep
Compound SOP
Page 6 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason Only one surrogate has relative percent recovery (RPR) values outside control limits and the parameter is a PFC (Detects).
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-22-4-082620 08/26/2020 320-64117-4 Perfluorohexanoic 0.0037 UG/L PQL 0.0020 J 537 Modified 3535_PFC
Acid
STW-LOC-22-4-082620 08/26/2020 320-64117-4 Hfpo Dimer Acid 0.099 UG/L PQL 0.0040 J 537 Modified 3535_PFC
STW-LOC-19B-082620 08/26/2020 320-64118-1 PFOA 0.0034 UG/L PQL 0.0020 J 537 Modified 3535_PFC
STW-LOC-19B-082620 08/26/2020 320-64118-1 PFOS 0.0021 UG/L PQL 0.0020 J 537 Modified 3535_PFC
STW-LOC-18-4-082620 08/26/2020 320-64117-2 Perfluorobutanoic Acid 0.0048 UG/L PQL 0.0020 J 537 Modified 3535_PFC
Page 7 of 9

DocuSign Envelope ID: 3296F1CC-
Site: Fayetteville
Validation Reason
8476-4A30-97 C B-604 DAA2 E 6672
Sampling Program: STORMWATER SAMPLING 8/20 Validation Options: LABSTATS
Associated MS and/or MSD analysis had relative percent recovery (RPR) values less than the lower control limit but above the rejection limit. The
reported result may be biased low.
Field Sample ID
STW-LOC-12-4-082620
STW-LOC-12-4-082620
STW-LOC-24A-082620
STW-LOC-24A-082620
Date
Sampled Lab Sample ID
08/26/2020 320-64096-1
08/26/2020 320-64096-1
08/26/2020 320-64103-1
08/26/2020 320-64103-1
Analyte
PFMOAA
PFMOAA
PFMOAA
PFMOAA
Result Units Type
0.012 ug/L PQL
0.012 ug/L PQL
0.018 ug/L PQL
0.018 ug/L PQL
Validation Analytical
MDL PQL Qualifier Method Pre -prep
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
0.0020 J Cl. Spec. Table 3
Compound SOP
Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
PFAS_DI_Prep
Page 8 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Site: Fayetteville Sampling Program: STORMWATER SAMPLING 8/20
Validation Options: LABSTATS
Validation Reason One or more surrogates had relative percent recovery (RPR) values less than the data rejection level. The reported result may be biased low.
Date Validation Analytical
Field Sample ID Sampled Lab Sample ID Analyte Result Units Type MDL PQL Qualifier Method Pre -prep Prep
STW-LOC-22-4-082620 08/26/2020 320-64117-4 Perfluoropentanoic 0.015 UG/L PQL 0.0020 J 537 Modified 3535_PFC
Acid
Page 9 of 9

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
APPENDIX B
Sitewide and Targeted Stormwater
Sampling Summary

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Appendix B
19 December 2020
Page 1
APPENDIX B
Geosyntec'>
consultants
GeOsymec Consultants of NC, P.C.
NC: License No.: C-3500 and C-295
SITEWIDE AND TARGETED STORMWATER SAMPLING
OCTOBER 2019 AND MARCH 2020
INTRODUCTION
This memorandum was prepared by Geosyntec Consultants of NC, P.C. (Geosyntec) for The
Chemours Company, FC, LLC (Chemours) to describe the results from two wet weather sampling
events conducted at locations representing stormwater-only runoff at the Chemours Fayetteville
Works, North Carolina site (the Site). Sampling was conducted to assess per- and polyfluoroalkyl
substances (PFAS) concentrations from stormwater locations at the Site (i.e., from drainage ditches
or channels before stormwater enters the Site Conveyance Network and mixes with dry weather
flows).
An initial sitewide stormwater sampling event occurred in June 2019, and results were reported in
the Assessment ofHFPO-DA and PFMOAA in Outfall 002 Discharge and Evaluations of Potential
Control Options' (2019 Outfall 002 Assessment). In the 2019 Outfall 002 Assessment,
hexafluoropropylene oxide dimer acid (HFPO-DA) and perfluoro-2-methoxyaceticacid
(PFMOAA) analytical results from samples collected from Outfall 002 and from the Cape Fear
River (at a location representing the river intake), between June 2017 and July 2019, were
evaluated. HFPO-DA concentrations generally increased during wet weather, indicating that
stormwater is a source of HFPO-DA loading to Outfall 002. Results from the June 2019 sitewide
stormwater sampling event (presented in the 2019 Outfall 002 Assessment) showed that
stormwater concentrations were generally higher than those measured at Outfall 002, particularly
during dry weather. Stormwater concentrations were spatially variable throughout the Site, with
certain sample clusters indicating potential areas of higher concentration and loading.
Subsequent stormwater sampling events (described herein) were conducted sitewide (October
2019) and from within targeted areas (March 2020). Stormwater sampling was conducted to
continue to support the investigations related to Paragraph 12 in the executed Consent Order
entered February 25, 2019 amongst Chemours and the North Carolina Department of
Environmental Quality (NCDEQ) and Cape Fear River Watch (CFRW). These data are also being
used by Chemours in preparing to implement the stormwater capture and treatment requirements
pursuant to Paragraph 4(a) of the Addendum to Consent Order Paragraph 12 (CO Addendum),
entered into court on August 13, 2020.
' Submitted as Attachment 3 to the Cape Fear River PFAS Loading Reduction Plan (August 2019) (Reduction Plan).
1 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Appendix B
19 December 2020
Page 2
Geosy tec'>
consultants
Geosyntec Consultants of NC, P.C.
NC: License No.: C-3500 and C-295
The sitewide stormwater grab sampling, conducted in June 2019 and again in October 2019,
sampled stormwater representing comingled runoff from various "surface types" (e.g., roofs, plant
equipment, paved areas, pervious area, walkways). A subsequent event was conducted in March
2020 to assess investigate PFAS concentrations in stormwater runoff from the various surface
types individually in the Chemours Monomers Ion Exchange Materials (IXM) area (Monomers
area) and Chemours Polymer Processing Aid (PPA) area as these two areas showed the most
elevated PFAS concentrations in prior sampling events.
This appendix presents information from the sitewide stormwater sampling event conducted in
October 2019, in addition to the targeted surface type stormwater sampling event in March 2020.
As previously noted, the June 2019 sitewide stormwater sampling event was reported in the 2019
Outfall 002 Assessment.
SAMPLING OBJECTIVES
The objective of the sitewide stormwater sampling conducted in October 2019 was to continue to
characterize PFAS concentrations in stormwater only flow across the Site. Informed by the results
of the June and October 2019 sitewide stormwater sampling, the objective of the targeted surface
type stormwater sampling conducted in March 2020 was to perform a more detailed investigation
of stormwater runoff concentrations within the Monomers and PPA areas and examine the
distribution of PFAS by surface type within these areas.
SAMPLING LOCATIONS
October 2019 Sitewide Stormwater Sampling Locations
Stormwater-only grab and time series samples were collected during the October 2019 sitewide
sampling event. The stormwater-only grab samples represented stormwater points of entry into the
Site Conveyance Network and did not include any dry weather flows (i.e., non -contact cooling
water [NCCW], river discharge, other process water). Samples were collected from 24 stormwater-
only locations throughout the Site. The time series samples (also obtained as grab samples) were
collected at four grab sample locations at equally spaced intervals throughout the duration of the
storm event and subsequent wash out. The sample locations are shown in Figure B 1 and listed in
Table B 1.
March 2020 Targeted Surface Type Stormwater Sampling Locations
Stormwater-only grab samples were collected during this sampling event, from within the
Monomers and PPA areas. The drainage areas to each sampling location represented various
surface types (i.e., overhead piping, pavement, pervious/gravel, rooftop, miscellaneous). The
sample locations are shown in Figures B2 and B3 and listed in Table B2.
2 December 2020

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Appendix B
19 December 2020
Page 3
Geosy tec'>
consultants
GeOsyntec Consultants of NC, P.C.
NC: License No.: C-3500 and C-295
There were 31 locations sampled during the targeted surface type stormwater sampling event, with
25 locations in the Monomers area and six locations in the PPA area. In the Monomers area, the
following surface types were represented by sample locations:
• Overhead piping: One (1) sample location (gutter/pipe discharge);
• Pavement: Three (3) sample locations (all sheet flow);
• Pervious and gravel: Six (6) sample locations (all sheet flow);
• Roof: 11 sample locations (all gutter/pipe discharge);
• Miscellaneous inlets: One (1) sample location (sheet flow); and
• Mixed surface types: Three (3) sample locations (two or more surface types).
In the PPA area, the following surface types were represented by sample locations:
• Pavement: One (1) sample location (sheet flow);
• Pavement and pervious/gravel: One (1) sample location (sheet flow);
• Roof: Three (3) sample locations (all gutter/pipe discharge); and
• Miscellaneous inlet: One (1) sample location (sheet flow).
SAMPLING PROCEDURES
The sitewide and targeted surface type stormwater sampling involved collecting stormwater runoff
samples from sampling locations during a rain event. Samples were collected for laboratory
analysis, and water quality parameters were also collected. Methods are described below in the
Methods section.
Parsons of NC conducted the field work and sampling described in this memorandum. All work
was performed according to the project health and safety plan prepared by Parsons (Parsons Health
and Safety Plan Chemours Fayetteville Site, 2018). A Plan on Action Discussion and Project
Safety Analysis was held prior to commencing field activities.
Sample Collection
Sitewide stormwater samples were collected from the locations specified in Table B 1 and shown
in Figure B 1. Targeted surface type stormwater samples were collected from the locations
specified in Table B2 and shown in Figures B2 and B3. Time -series samples are denoted in the
figures as "-1", "-2", and "-3" in order of sample time. Grab samples were collected in 250
milliliter (mL) high density polyethylene (HDPE) bottles with a wide -mouth screw -cap. Bottles
were either filled by hand or using a properly decontaminated dip rod with the bottle attached with
3 December 2020

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Appendix B
19 December 2020
Page 4
Geosy tec'>
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
a nylon zip tie. Sample bottle caps were securely fastened after sample collection. Sample
collection began once 0.1 inches of rainfall had fallen. Each sample was labelled 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, field parameters, and
other observations.
Water Quality Parameter Assessment
Water quality parameters were also collected at the locations where samples were collected. All
equipment was inspected by the field program on -Site supervisor and calibrated at least daily prior
to use in the field according to the manufacturer's recommended guidelines. Calibration
information was recorded in a field logbook. Field parameters were measured with a water quality
meter after sample collection and include the following:
• pH;
• Total dissolved solids [TDS] (milligrams per liter, mg/L); and
• Turbidity (nephelometric turbidity units, NTU).
Decontamination Methods
Sample containers were new and used only once for each sample. Disposable equipment (e.g.,
gloves, tubing, etc.) was not reused and 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.
Sample Shipping, Chain of Custody, and Holding Times
Upon sample collection, each labelled, containerized sample was placed into a 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.
Field QA/QC Samples
The following field QA/QC samples were collected and analyzed during each sampling event:
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• Two blind field duplicates (one for every 20 samples);
• One equipment blank for the dip rod;
• One field blank; and
• One trip blank2.
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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, measured field
parameters, sample COC, and shipping records.
Laboratory Analyses
Laboratory analyses varied between the two sampling events.
Sitewide Stormwater Sampling
Stormwater samples from the sitewide stormwater sampling event in October 2019 were analyzed
for PFAS by the 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 B3.
Samples were analyzed by TestAmerica Sacramento.
The SOP for laboratory analysis of Table 3+ parameters includes filtering all samples through a
0.2 micrometer (gm) filter. Therefore, stormwater samples from the October 2019 sitewide
sampling event were filtered with a 0.2 gm filter.
Targeted Surface Type Stormwater Sampling
Stormwater samples from the targeted surface type stormwater sampling event in March 2020
were analyzed for total PFAS by the Table 3+ SOP. PFAS reported under this method are listed in
Table B3. Samples were analyzed by Lancaster Laboratories. Stormwater samples from the
targeted surface type stormwater sampling event, representing "total" PFAS, were not filtered
(through the typical Table 3+ SOP requirement of a 0.2 gm filter) in the field or upon arrival at
the laboratory.3 Select grab samples from the targeted surface type stormwater sampling event
2 Only collected during the October 2019 sampling event.
3 Due to a high level of visible suspended solids in the samples from locations 68 and 85, the "total" PFAS samples
from these locations were filtered with a 0.45 gm filter prior to analysis. These results are presented with other "total"
PFAS concentrations in the maps and bar plots, including notes to specify the varying filtering protocol. However,
these data are not included in the boxplots or statistical analyses because the analytical methods are not consistent
with the other "total" PFAS samples.
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were also analyzed for dissolved (i.e., filtrate) PFAS.4 These samples were filtered at the laboratory
with a 0.45 µm filter.
RESULTS AND DISCUSSION
This section discusses the data quality protocols, Table 3+ compounds analyzed, and discussion
of the results from each stormwater sampling event.
Data Quality
The analytical data were reviewed using the Data Verification Module (DVM) within the LocusTM
Environmental Information Management (EIM) system, 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 USEPA Guidance for Labeling
Externally Validated Laboratory Analytical Data for Superfund Use (USEPA-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 quality assurance/quality control samples;
• Matrix spike/matrix spike duplicate 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.
A manual review of the data was also conducted and includes instrument -related quality control
results for calibration standards, blanks, and recoveries. The data review process (DVM plus
manual review) applied the following data evaluation qualifiers to the analytical results as
required:
• J Analyte present, reported value may not be accurate or precise;
a Select grab samples (as specified in Table B2) were also analyzed for Total Suspended Solids (TSS) and solid residue
collected on the filter (particulate PFAS). Results for these analyses are included in Attachment B-2.
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• UJ Analyte not present below the reporting limit, reporting limit may not be accurate or
precise; and
• B Analyte present in a blank sample, reported value may have a high bias.
The data review process described above was performed for all laboratory chemical analytical 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, with the
exception of R-PSDA, Hydrolyzed PSDA, and R-EVE.
Table 3+ Compounds
As reported in the Matrix Interference During Analysis of Table 3+ Compounds memorandum
(Geosyntec, 2020a), matrix interference studies conducted by the analytical laboratory
(TestAmerica, Sacramento) have shown that the quantitation of three compounds (R-PSDA
[formerly Byproduct 4], Hydrolyzed PSDA [formerly Byproduct 5], and R-EVE) is inaccurate due
to interferences by the sample matrix in both groundwater and surface water. Given the matrix
interference issues, Total Table 3+ PFAS concentrations are calculated in two ways: (i) summing
over 17 of the 20 Table 3+ compounds "Total Table 3+ (sum of 17 compounds)", i.e., excluding
results of R-PSDA, Hydrolyzed PSDA, and R-EVE, and (ii) summing over 20 of the Table 3+
compounds "Total Table 3+ (sum of 20 compounds)". Expressing these data as a range represents
possible values of what these results might be without matrix interferences. In other words, the
sum of all 17 compounds is an underestimate of the actual value while the sum of the 20
compounds is likely an overestimate of the actual value.
For clarity the text and figures of this report describe the Total Table 3+ (sum of 17 compounds).
The tables include both the Total Table 3+ (sum of 17 compounds) and Total Table 3+ (sum of 20
compounds).
Sitewide Stormwater Sampling
Sampling was conducted between 9:50 AM and 12:45 PM on October 16, 2019. Prior to the
sampled rain event, there was an antecedent dry period of 48 hrs. Sampling began after 0.3 inches
of rain had fallen and throughout the sampling event, there was an additional 0.07 inches of
rainfall. The cumulative rainfall throughout the rain event, in addition to the period when sampling
occurred, is shown in Figure B4. At each sampling location, the project field team recorded field
parameter measurements and observations. Field notes and measurements are shown in Table B4
and the full field forms, including photographs, are included in Attachment A-1.
Compared to the June 2019 sitewide stormwater sampling event (average Total Table 3+
concentration = 17,000 ng/L), PFAS concentrations in stormwater during the October 2019
sampling event were generally higher (average Total Table 3+ concentration = 45,000 ng/L).
Consistent with the June 2019 results, the highest concentrations in stormwater were observed in
the Monomers area, as shown in the map in Figure B 1 and the plots in Figure B5 and Figure B6.
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The average Total Table 3+ concentration in the Monomers area was 330,000 nanograms per liter
(ng/L), which was higher than the average at the rest of the Site (excluding the Monomers area)
(19,000 ng/L).
Two locations were sampled in the Monomers area (Locations 10 and 42) in October 2019. Three
time series samples were collected from Location 42. Sample results showed that concentrations
at this location were elevated throughout the sampling event; Total Table 3+ concentrations ranged
from 340,000 ng/L (second of the three times series samples) to 530,000 ng/L (first of the three
samples). Furthermore, Locations 10 and 42 had the two highest PFMOAA and Total Table 3+
concentrations of any location sampled during the event, and Location 10 had the highest HFPO-
DA concentration. This is consistent with the June 2019 stormwater sampling results, where the
highest stormwater concentrations were observed in the Monomers area.
The PPA area was also identified in the June 2019 event as another area with elevated PFAS
concentrations in stormwater, although not as elevated as in the Monomers area. During the
October 2019 sitewide sampling event, this spatial trend was not as evident. Stormwater
concentrations in the PPA area were within the range of concentrations at the rest of the Site for
HFPO-DA (range of 820 to 2,300 ng/L, range at locations not within the PPA or Monomers areas
was 180 to 80,000 ng/L), as shown in Figure B6. Further, the average Total Table 3+ concentration
in the PPA area (2,500 ng/L) was actually lower compared to the rest of the Site (excluding the
Monomers and PPA areas) (21,000 ng/L).
Location 54 in the southwestern portion of the Site also exhibited elevated PFAS concentrations
during the October 2019 stormwater sampling event, with concentrations of 80,000 ng/L, 650
ng/L, and 96,000 ng/L for HFPO-DA, PFMOAA, and Total Table 3+, respectively. Location 52
also exhibited elevated concentrations during both the June and October 2019 stormwater
sampling events. Stormwater concentrations in October 2019 were 23,000 ng/L, 3,100 ng/L, and
85,000 ng/L, for HFPO-DA, PFMOAA, and Total Table 3+, respectively. This sampling location
drains a small area north of the cooling water channel in the Monomers area, in the northeast corner
of the Site (just east of the north easternmost building on Site), which ultimately drains to the
seeps. These waters will be treated pursuant to the requirements of the CO Addendum Paragraph
2(c)(i).
Targeted Surface Type Stormwater Sampling
Targeted surface type stormwater sampling was conducted between 10:45 AM and 3:30 PM on
March 5, 2020. Prior to the sampled storm, there was an antecedent dry period of 31 hrs. There
was 0.14 inches of rain before sampling began. During the sampling period, there was
approximately 0.1 inches of rain and rainfall intensity ranged from 0.01 to 0.05 inches per hour,
as shown in Figure B7. Rainfall intensity was fairly constant throughout the sampling period. At
each sampling location, the project field team recorded field parameter measurements and
observations. Field notes and measurements are shown in Table B5 and the full field forms,
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including photographs, are included in Attachment A-2. Observations regarding surface types were
used to verify and revise the original designations for each sampling location.
Results from the targeted surface type stormwater sampling event in March 2020, in the Monomers
area, are shown in Figure B2 and the plots in Figure B8 and Figure B9. The plots are colored based
on the surface types of the sampling location drainage areas. In the Monomers area, average Total
Table 3+ concentrations during the targeted surface type stormwater sampling event (53,000 ng/L)
were lower than during the June 2019 and October 2019 sitewide sampling events (74,000 ng/L
and 330,000 ng/L, respectively). A similar trend was observed at the sample location in the
Monomers area that was sampled during all three stormwater sampling events (Location 42),
where the Total Table 3+ concentrations were 150,000 ng/L (average of time -series samples),
440,000 ng/L (average of time -series samples), and 130,000 ng/L, in June 2019, October 2019,
and March 2020, respectively.
Consistent with the results from the sitewide sampling event, concentrations were highest in the
Monomers area. During the targeted surface type stormwater sampling event, trends between
surface types (i.e., overhead piping, pavement, pervious/gravel, rooftop, miscellaneous) were
consistent for HFPO-DA, PFMOAA, and Total Table 3+ concentrations. Total Table 3+
concentrations for areas draining pavement were compared against locations draining other surface
types using a Mann Whitney U test with a significance level of 0.05. While the median Total Table
3+ concentration for locations draining pavement (73,000 ng/L, n = 5) was higher than the median
concentration for locations draining other surface types (10,000 ng/L, n = 19), the Mann Whitney
U test revealed no statistically significant difference (p-value = 0.08). Elevated concentrations
were measured at locations draining various surface types, suggesting that all surface types
evaluated contributed to the PFAS concentrations observed in Monomers area stormwater.
Concentrations in stormwater samples from the PPA area were lower than concentrations in
samples from the Monomers area, as shown in the map in Figure B3 and the charts in Figure B8
and Figure B9. The average Total Table 3+ concentration in the PPA area was 480 ng/L compared
to 53,000 ng/L in the Monomers area. In the PPA area, the concentration at the sampling location
draining pavement was slightly higher than concentrations at sampling locations draining other
surface types5. However, even the concentration in the area with pavement (Total Table 3+
concentration = 900 ng/L) was lower than the concentrations in the majority of samples (from all
surface types) in the Monomers area.
Select grab samples from the targeted surface type stormwater sampling event were also analyzed
for dissolved (i.e., filtrate) PFAS. Dissolved concentrations were compared against total
concentrations for HFPO-DA, PFMOAA, and Total Table 3+. As shown in Figure B 10, total and
dissolved PFAS concentrations were generally equivalent for each sample. The average dissolved
5 Sample sizes were not sufficiently large to perform statistical tests on surface type data from the PPA area.
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fraction for Total Table 3+ was 92%, indicating that PFAS in stormwater is primarily in the
dissolved form.
CONCLUSIONS
Wet weather sampling was conducted at locations representing stormwater-only runoff at the Site,
in order to assess PFAS concentrations from stormwater locations. Stormwater sampling was
conducted at sitewide locations in June and October 2019, and sampling was again conducted in
March 2020, in targeted areas only (Monomers and PPA areas), to investigate PFAS
concentrations in stormwater runoff from the various surface types. The June 2019 sampling event
was reported in the 2019 Outfall 002 Assessment, and the October 2019 and March 2020 sampling
events are presented herein.
The sitewide stormwater sampling results from October 2019 showed that PFAS concentrations
in stormwater were highest in the Monomers area, consistent with findings from the June 2019
stormwater sampling event. During the October 2019 and March 2020 sampling events,
stormwater concentrations in the PPA area were consistent with the rest of the Site and notably
lower than the Monomers area. Because the stormwater sampling locations from the two sitewide
sampling events represented comingled runoff from various surface types (e.g., roofs, paved areas,
pervious areas), a targeted surface stormwater sampling event was conducted, in the Monomers
and PPA areas, to determine if certain surface types were contributing higher concentrations of
PFAS in stormwater.
Stormwater runoff concentrations exhibited notable spatial variation during the targeted surface
type sampling event, between the two areas assessed. The sitewide average stormwater
concentration, excluding the Monomers area, was 19,000 ng/L for Total Table 3+ during the
October 2019 stormwater sampling event. Additionally, as discussed in the 2019 Outfall 002
Assessment, the concentrations measured at Outfall 002 were separated into estimated
concentrations and flows from stormwater versus dry weather flows. Based on the approach
outlined in the 2019 Outfall 002 Assessment, the average concentration of stormwater at Outfall
002 was estimated to be 9,600 ng/L (considering Outfall 002 data from August 2019 through May
2020). This estimated average stormwater concentration includes contributions from the
Monomers area.
As presented herein, the average Total Table 3+ stormwater concentration from the Monomers
area was 330,000 ng/L and 53,000 ng/L during the October 2019 and March 2020 stormwater
sampling events, respectively. This data suggest that average PFAS stormwater concentrations
measured in the Monomers area are consistently higher than the sitewide average stormwater
concentrations, as estimated from concentrations measured at Outfall 002 and as measured during
sitewide stormwater sampling. PFAS concentrations were consistently higher in the Monomers
area than the PPA area. Given that the two areas are similar in size and therefore contribute similar
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flows, this indicates that the Monomers area is likely the most significant contributor of PFAS
concentrations to stormwater at Outfall 002.
Within the Monomers area, there was no clear relationship between concentrations and surface
types. Within the Monomers area, surface type did not appear to affect concentrations in
stormwater. Additionally, PFAS concentrations in stormwater were found to be predominantly in
the dissolved fraction.
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REFERENCES
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GeOsymec Consultants of NC, P.C.
NC: License No.: C-3500 and C-295
Geosyntec, 2020a. Matrix Interference During Analysis of Table 3+ Compounds. Chemours
Fayetteville Works. June 30, 2020.
Parsons, 2018. Health and Safety Plan Chemours Fayetteville Site.
Enclosures:
Table B 1: October 2019 Sitewide Stormwater Sampling Locations
Table B2: March 2020 Targeted Surface Type Sampling Locations
Table B3: PFAS and Associated Analytical Methods
Table B4: October 2019 Sitewide Stormwater Sampling Field Notes
Table B5: March 2020 Targeted Surface Type Sampling Field Notes
Figure B 1: Map of Sitewide Stormwater Sampling — October 2019: HFPO-DA, PFMOAA, and
Total Table 3+ Concentrations
Figure B2: Map of Chemours Monomers/IXM Area — March 2020: HFPO-DA, PFMOAA, and
Total Table 3+ Concentrations
Figure B3: Map of Kuraray SentryGlas and Chemours PPA Area — March 2020: HFPO-DA,
PFMOAA, and Total Table 3+ Concentrations
Figure B4: Cumulative Rainfall of 10/16/2019 at Chemours Fayetteville
Figure B5: Sitewide Stormwater Samples by Location: HFPO-DA, PFMOAA, and Total Table
3+ Concentrations
Figure B6: Sitewide Stormwater Samples by Site Region: HFPO-DA, PFMOAA, and Total
Table 3+ Concentrations
Figure B7: Cumulative Rainfall on 3/5/2020 at USGS station 02105500
Figure B8: Targeted Surface Type Samples by Location: HFPO-DA, PFMOAA, and Total Table
3+ Concentrations
Figure B9: Sitewide Stormwater Samples by Surface Type: HFPO-DA, PFMOAA, and Total
Table 3+ Concentrations
Figure B10: Dissolved vs Total: HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Attachment A: Field Forms
Attachment B: Analytical Results
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TABLE B1
OCTOBER 2019 SITEWIDE STORMWATER SAMPLING LOCATIONS
Chemours Fayetteville Works, North Carolina
Location
Individual Grab Sample'
Time Series Samples2
2
✓
3
✓
5
✓
10
✓
13
✓
25
✓
26
✓
27
✓
28
✓
29
✓
30
✓
31
✓
32
✓
33
✓
34
✓
35
✓
✓
36
✓
37
✓
38
✓
✓
39
✓
✓
40
✓
41
✓
42
✓
✓
43
✓
44
✓
45
✓
46
✓
47
✓
52
✓
53
✓
54
✓
55
✓
1 - Samples were collected for:
Total PFAS, by EPA Method 537 Mod and Table 3+ Lab SOP.
2 - Collected 3 separate grab samples at equally spaced intervals throughout the duration of the
storm event and subsequent wash out.
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TABLE B2
MARCH 2020 TARGETED SURFACE TYPE SAMPLING
LOCATIONS Chemours Fayetteville Works, North
Carolina
Location
1
Surface Type
z
Sample Type2
Individual Grab
Dissolved PFAS, Solid
Residue, and TSS
61
Grass, Pavement, and
Pervious/Gravel
Sheet flow
✓
79
Micellaneous Inlet
Sheet flow
✓
83
Miscellaneous Inlet
Sheet flow
✓
78
Overhead Piping
Gutter/Pipe Discharge
✓
68
Pavement
Sheet flow
✓
71
Pavement
Sheet flow
✓
V
80
Pavement
Sheet flow
✓
84
Pavement
Sheet flow
✓
85
Pavement and
Pervious/Gravel
Sheet flow
V
62
Pervious/Gravel
Sheet flow
✓
✓
63
Pervious/Gravel
Sheet flow
✓
✓
64
Pervious/Gravel
Sheet flow
✓
✓
65
Pervious/Gravel
Sheet flow
✓
✓
77
Pervious/Gravel
Sheet flow
✓
✓
63A
Pervious/Gravel
Sheet flow
✓
✓
42
Roof
Gutter/Pipe Discharge
✓
✓
43
Roof
Gutter/Pipe Discharge
✓
58
Roof
Gutter/Pipe Discharge
✓
✓
59
Roof
Gutter/Pipe Discharge
✓
60
Roof
Gutter/Pipe Discharge
✓
66
Roof
Gutter/Pipe Discharge
✓
67
Roof
Gutter/Pipe Discharge
✓
72
Roof
Gutter/Pipe Discharge
✓
✓
73
Roof
Gutter/Pipe Discharge
✓
75
Roof
Gutter/Pipe Discharge
✓
76
Roof
Gutter/Pipe Discharge
✓
86
Roof
Gutter/Pipe Discharge
✓
87
Roof
Gutter/Pipe Discharge
✓
88
Roof
Gutter/Pipe Discharge
✓
69
Roof and Pavement
Sheet flow
✓
✓
70
Roof, Pervious/Gravel,
and Pavement
Sheet flow
✓
1 - Surface type corresponds to source material of stormwater at specified location.
2 - Sample type corresponds to type of discharge and collection method.
3 - For the stormwater source area sampling event, samples were collected for:
Total PFAS by Table 3+ Lab SOP. Samples were shipped to Lancaster Laboratories. Samples were not
filtered (through the typical Table 3+ SOP requirement of a 0.2 gm filter) upon arrival at the laboratory.
4 - Select grab samples were also analyzed for the following:
Dissolved PFAS by Table 3+ Lab SOP using a 0.45 gm filter (dissolved or filtrate PFAS, in ng/L).
Filtering was conducted at the lab.
Total Suspended Solids (TSS, in mg/L)
Solid residue collected on the filter (particulate PFAS, in ng/mL)
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TABLE B3
PFAS AND ASSOCIATED ANALYTICAL METHODS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Analytical Method
Common Name
Chemical Name
CASN
Chemical Formula
Table 3+ Lab SOP
HFPO-DA*
Hexafluoropropylene oxide dimer acid
13252-13-6
C6HF1103
PEPA
Perfluoro-2-ethoxypropionic acid
267239-61-2
C5HF903
PFECA-G
Perfluoro-4-isopropoxybutanoic acid
801212-59-9
C12H9F903S
PFMOAA
Perfluoro-2-methoxyacetic acid
674-13-5
C3HF503
PF02HxA
Perfluoro-3,5-dioxahexanoic acid
39492-88-1
C4HF704
PFO3OA
Perfluoro-3,5,7-trioxaoctanoic acid
39492-89-2
C5HF905
PFO4DA
Perfluoro-3,5,7,9-tetraoxadecanoic acid
39492-90-5
C6HF11O6
PMPA
Perfluoro-2-methoxypropionic acid
13140-29-9
C4HF703
Hydro -EVE Acid
2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(1,2,2,2-
tetrafluoroethyl)oxy]propan-2-yl}oxy)propionic acid
773804-62-9
C8H2F1404
EVE Acid
2,2,3,3-tetrafluoro-3-({1,1,1,2,3,3-hexafluoro-3-[(1,2,2-
trifluoroethenyl)oxy]propan-2-yl}oxy)propionic acid
69087-46-3
C8HF1304
PFECA B
Perfluoro-3,6-dioxaheptanoic acid
151772-58-6
C5HF904
R-EVE
Pentanoic acid, 4-(2-carboxy-1,1,2,2-tetrafluoroethoxy)-
2,2,3,3,4,5,5,5-octafluoro
2416366-22-6
C8H2F1205
PFOSDA
Perfluoro-3,5,7,9,11-pentaoxadodecanoic acid
39492-91-6
C7HF1307
R-PSDA
Pentanoic acid, 2,2,3,3,4,5,5,5-octafluoro-4-(1,1,2,2-tetrafluoro-
2-sulfoethoxy)
2416366-18-0
C7H2F1206S
R-PSDCA
Ethanesulfonic acid, 1,1,2,2-tetrafluoro-2-[1,2,2,3,3-pentafluoro-
1-(trifluoromethyl)propoxy]
2416366-21-5
C6H2F1204S
Hydrolyzed PSDA
Acetic acid, 2-fluoro-2-[1,1,2,3,3,3-hexafluoro-2-(1,1,2,2-
tetrafluoro-2-sulfoethoxy)propoxy]
2416366-19-1
C7H3F1107S
NVHOS
1,1,2,2,4,5,5,5-heptafluoro-3-oxapentanesulfonic acid; or 2-
(1,2,2,2-ethoxy)tetrafluoroethanesulfonic acid; or 1-(1,1,2,2-
tetrafluoro-2-sulfoethoxy)-1,2,2,2-tetafluoroethane
1132933-86-8
C4H2F804S
PES
Perfluoro-2-ethoxyethanesulfonic acid
113507-82-7
C4HF9O4S
PS Acid
Ethanesulfonic acid, 2-[1-[difluoro[(1,2,2-
trifluoroethenyl)oxy]methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-
tetrafluoro
29311-67-9
C7HF13O5S
Hydro-PS Acid
Ethanesulfonic acid, 2-[1-[difluoro(1,2,2,2-
tetrafluoroethoxy)methyl]-1,2,2,2-tetrafluoroethoxy]-1,1,2,2-
tetrafluoro
749836-20-2
C7H2F1405S
EPA Method 537 Mod
PFBA
Perfluorobutanoic acid
375-22-4
C4HF702
PFDA
Perfluorodecanoic acid
335-76-2
CIOHF1902
PFDoA
Perfluorododecanoic acid
307-55-1
C12HF2302
PFHpA
Perfluoroheptanoic acid
375-85-9
C7HF1302
PFNA
Perfluorononanoic acid
375-95-1
C9HF1702
PFOA
Perfluorooctanoic acid
335-67-1
C8HF15O
PFHpA
Perfluorohexanoic acid
307-24-4
C6HF11O2
PFPeA
Perfluoropentanoic acid
2706-90-3
C5HF902
PFTeA
Perfluorotetradecanoic acid
376-06-7
C14HF2702
PFTriA
Perfluorotridecanoic acid
72629-94-8
C13HF2502
PFUnA
Perfluoroundecanoic acid
2058-94-8
C11HF21O2
PFBS
Perfluorobutanesulfonate
375-73-5
C4HF9SO
PFDS
Perfluorodecanesulfonate
335-77-3
C1OHF21O3S
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
C12H5F2103
4:2 FTS
Fluorotelomer sulfonate 4:2
757124-72-4
C6H5F903S
6:2 FTS
Fluorotelomer sulfonate 6:2
27619-97-2
C8H5F13S03
8:2 FTS
Fluorotelomer sulfonate 8:2
39108-34-4
C1OH5F1703S
NEtFOSAA
N-ethyl perfluorooctane sulfonamidoacetic acid
2991-50-6
C12H8F17NO4S
NEtPFOSA
N-ethylperlluoro-l-octanesulfonamide
4151-50-2
C1OH6F17NO2S
NEtPFOSAE
N-ethyl perfluorooctane sulphonamidoethanol
1691-99-2
C12H10F17NO3S
NMeFOSAA
N-methyl perfluorooctane sulfonamidoacetic acid
2355-31-9
C11H6F17NO4S
NMePFOSA
N-methylperfluoro-l-octanesulfonamide
31506-32-8
C9H4F17NO2S
NMePFOSAE
N-methyl pertluorooctanesulfonamidoethanol
24448-09-7
C11H8F17NO3S
PFDOS
Perfluorododecanesulfonic acid
79780-39-5
C12HF2503S
PFHxDA
Perfluorohexadecanoic acid
67905-19-5
C16HF3102
PFODA
Perfluorooctadecanoic acid
16517-11-6
C18HF3502
PFOSA
Perfluorooctane Sulfonamide
754-91-6
C8H2F17NO2S
F-53B Major
F-53B Major
73606-19-6
C8HC1F1604S
F-53B Minor
F-53B Minor
83329-89-9
C10HCIF2004S
ADONA
4,8-dioxa-3H-perfluorononanoate
958445-44-8
C7H2F1204
NaDONA
NaDONA
EVS1361
--
DONA
DONA
919005-14-4
--
Notes:
*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
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B4
OCTOBER 2019 SITEWIDE STORMWATER
SAMPLING FIELD NOTES Chemours Fayetteville
Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Sample Date and Time
Temperature
Sky
Precipitation
Wind (mph)
pH
TDS
Turbidity
Observations
55
10/16/19 9:48
18
Cloudy
Rain
5.00
4.95
0.066
255
52
10/16/19 10:10
20
Cloudy
Rain
5.00
5.36
0.023
608
10
10/16/19 10:30
19
Cloudy
Rain
6.00
5.68
0.037
53.5
Taken further up from road because of vac truck
40
10/16/19 10:42
19
Cloudy
Rain
6.00
5.86
0.057
11.3
41
10/16/19 10:45
19
Cloudy
Rain
6.00
5.9
0.049
80
2
10/16/1911:00
19
Cloudy
Rain
6.00
6.09
0.027
100
25
10/16/1911:05
19
Cloudy
Rain
6.00
5.97
0.016
16.2
3
10/16/1911:10
19
Cloudy
Rain
6.00
6
0.011
136
27
10/16/19 11:25
19
Cloudy
Rain
6.00
6.07
0.012
1000
Great deal of leaf litter in ditch
28
10/16/1911:30
19
Cloudy
Rain
6.00
6.07
0.014
105
5
10/16/1911:50
21
Cloudy
Rain
6.00
6.36
0.016
15.4
30
10/16/19 11:55
21
Cloudy
Rain
6.00
5.85
0.024
151
31
10/16/19 12:10
21
Cloudy
Rain
8.00
5.83
0.013
154
MS/REP/DUP
32
10/16/19 12:20
21
Cloudy
Rain
8.00
6.26
0.019
1000
MS REP DUP
34
10/16/19 12:45
21
Cloudy
None
8.00
6.34
0.032
890
33
10/16/19 12:40
21
Cloudy
None
8.00
6.25
0.026
822
54
10/16/19 12:55
21
Cloudy
None
8.00
6.55
0.023
1000
36
10/16/19 13:05
21
Cloudy
None
8.00
6.57
0.036
12.1
13
10/16/19 13:20
21
Cloudy
Rain
8.00
6.69
0.017
9.5
37
10/16/19 13:27
22
Cloudy
None
9.00
6.43
0.05
1000
39
10/16/19 13:50
22
Cloudy
None
5.00
6.78
0.047
0.8
38
10/16/19 13:35
22
Cloudy
None
3.00
6.07
0.026
0.2
35
10/16/19 13:20
22
Cloudy
None
2.00
6.71
0.025
86.4
42
10/16/19 10:26
19
Cloudy
Rain
3.00
5.4
0.048
16.3
Took from larger white plastic pipe (East side)
35
10/16/19 10:55
19
Cloudy
None
6.00
5.81
0.024
66.4
Taken from opposing side of 35
38
10/16/1911:13
20
Cloudy
Rain
3.00
5.91
0.036
14.4
39
10/16/19 11:23
20
Cloudy
Rain
3.00
6.28
0.061
1.8
42
10/16/19 11:50
21
Cloudy
None
5.00
6.55
0.023
13.2
35
10/16/19 12:10
21
Cloudy
None
5.00
6.52
0.023
52.4
38
10/16/19 12:25
21
Cloudy
None
3.00
6.46
0.032
0
39
10/16/19 12:35
21
Cloudy
None
4.00
6.71
0.049
7.2
42
10/16/19 12:45
Cloudy
None
6.72
0.03
7
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B5
MARCH 2020 TARGETED SURFACE TYPE SAMPLING
FIELD NOTES Chemours Fayetteville Works, North
Carolina
Geosyntec Consultants of NC P.C.
Location ID
Sample Date
and Time
Temperature
(°C)
Sky
Precipitation
Wind
(mph)
Measured
Flow Rate
(L/min)
pH
TDS
Turbidity
Observations
42
3/5/20 11:20
11
Cloudy
Rain
4.00
1.8
7.72
0.15
7.99
Flow from pipe
43
3/5/20 11:30
11
Cloudy
Rain
4.00
2.1
7.85
0.13
126.35
Flow from pipe
58
3/5/20 12:45
10
Cloudy
Rain
4.00
2.3
7.71
0
1.83
Sample from roof of building
59
3/5/20 12:50
10
Cloudy
Rain
4.00
1.4
7.6
0.03
33.56
Sample most likely from pavement
60
3/5/20 12:55
10
Cloudy
Rain
4.00
1.3
7.66
0.02
1.72
Sample coing from roof of building
61
3/5/20 11:15
11
Cloudy
Rain
2.00
NS
7.83
0.11
139.87
Sample taken from beneath grate. Flow coming from gravel/sand/grass
field to the NW. Couldn't get flow due to multiple entry locations into
grate.
62
3/5/20 15:00
10
Cloudy
Rain
4.00
0.3
8.39
0.12
49.77
None
63
3/5/20 10:45
11
Cloudy
Rain
6.00
NS
7.99
0.23
189.88
Collected sample from water flowing into drainage ditch. Water
flowing from gravel area to the north. Could not get flow rate.Sample
from imperious surface
63A
3/5/20 13:45
9
Cloudy
Rain
8.00
3.1
7.22
0.01
4.34
Sample coming from gravel area west of pipe, sampled from pipe.
64
3/5/20 13:20
11
Cloudy
Rain
8.00
3
7.28
0.02
38.7
Sample flowing from gravel area south of culvert
65
3/5/20 13:30
11
Cloudy
Rain
8.00
NS
7.52
0.04
338
Sample coming from gravel area south of colvert and also from
pavement (road) west of location. Can't get flow rate due to rocks
66
3/5/20 13:50
9
Cloudy
Rain
7.00
0.25
7.08
0.01
1.64
Sample from roof of building
67
3/5/20 14:00
9
Cloudy
Rain
7.00
0.57
7.03
0.02
1.61
Sample from roof
68
3/5/20 14:30
9
Cloudy
Rain
7.00
NS
6.7
0.04
420.72
Sample coming from pavement to the NW of grateUnable to get flow
rate due to multiple entry's into grate
69
3/5/20 14:40
11
Cloudy
Rain
7.00
NS
7.69
0.02
23.73
No flow due to multiple entry waysSample from pavement coming
from road and processing area
70
3/5/20 14:50
11
Cloudy
Rain
7.00
7.55
0.05
32.54
No flow rate. Sample coming from runoff from gravel area
71
3/5/20 13:20
11
Cloudy
Rain
4.00
0.3
7.85
0.13
163.16
Sample taken by dip rod. Flow coming from crack in the concrete,
seeping from puddles around grate
72
3/5/20 23:10
10
Cloudy
Rain
3.00
0.2
7.79
0.1
2.57
Flow from roof
73
3/5/20 11:00
11
Cloudy
Rain
3.00
0.3
7.76
0.06
0.54
Flow from roof
75
3/5/20 14:30
10
Cloudy
Rain
6.00
0.2
7.54
0.06
0.3
Water coming from roof
76
3/5/20 14:00
10
Cloudy
Rain
6.00
0.2
7.69
0.16
4.51
Flow from rooftop
77
3/5/20 12:50
12
Cloudy
Rain
6.00
0.5
7,52
0.04
29.75
Flow coming from road run off into drain
78
3/5/20 12:40
11
Cloudy
Rain
5.00
0.1
7.25
0.05
1.29
Flow estimated by volume in tray after 30 seconds, sample taken from
downspout from steel tray attached below overhead pipes. Sample
taken from HDPE tray seen in photo.
79
3/5/20 23:40
11
Cloudy
Rain
5.00
NS
7.68
0.05
28.28
Sample coming from location 79. Under from trailer and into grate.
Unclear if coming from pipe or from pool after the pipe.Couldn't get
flow due to multiple entry points
80
3/5/20 11:45
10
Cloudy
Rain
5.00
NS
8.04
0.07
99.64
Sample coming from imperious surface. Loading/unloading area at
1XM.Couldn't get flow due to multiple entrys into grate
83
3/5/20 14:15
9
Cloudy
Rain
8.00
1.1
7.27
0.07
15.24
Drain from ppa lab gutter, closest to ppa
84
3/5/20 12:20
10
Cloudy
Rain
8.00
1.7
7.13
0.05
15.97
Sentry glass sheet flow sampled with dip rod at pipe in ditch, located
adjacent to ppa
85
3/5/20 15:30
9
Cloudy
Rain
7.00
0.2
6.53
0.01
27.82
Location flows into wood lined ditch, very light rain. Flow through the
gravel
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B5
MARCH 2020 TARGETED SURFACE TYPE SAMPLING
FIELD NOTES Chemours Fayetteville Works, North
Carolina
Geosyntec Consultants of NC P.C.
Location ID
Sample Date
and Time
Temperature
(°C)
Sky
Precipitation
Wind
(mph)
Measured
Flow Rate
(L/min)
pH
TDS
Turbidity
Observations
86
3/5/20 13:43
10
Cloudy
Rain
7.00
0.061
6.87
0.1
5.82
Pipe coming from trailer roof at ppa. The pipe is the one closest to ppa
not the entrance
87
3/5/20 11:40
11
Cloudy
Rain
7.00
13.2
7.59
0.07
4.13
Roof drain pipe drain from Sentry glass facing PPA
88
3/5/20 15:06
9
Cloudy
Rain
8.00
NS
6.87
0
4.11
second to last drainage pipe from roof at sentry glass, behind towards
main gate. Could not measure flow, likely about 5 liters per minute
TR0795A
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
FIGURES
14 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
HFPO-DA
1,500
PFMOAA
56 J
Total Table 3+ (17)
2,600
HFPO-DA
480
PFMOAA
37
Total Table 3+ (17)
1,500
HFPO-DA
180
PFMOAA
<5
Total Table 3+ (17)
590
HFPO-DA
340 / 330
PFMOAA
48J/51
Total Table 3+ (17)
1,400 / 1,300
HFPO-DA
2,9001 /
2,300 J
PFMOAA
550 /
600
Total Table 3+ (17)
57,000 /
61,000
HFPO-DA
820
PFMOAA
1901
Total Table 3+ (17)
1,800
HFPO-DA
80,000
PFMOAA
650
T
r,o,ecDon: i11-1„as,IalerlaneNorm 3000 reer, un. roor
HFPO-DA
2,300
PFMOAA
2501
Total Table 3+ (17)
3,500
HFPO-DA
1,100
PFMOAA
150
Total Table 3+ (17)
3,500
HFPO-DA
5,900
PFMOAA
350 J
Total Table 3+ (17)
11,000
HFPO-DA
4,900
PFMOAA
2,400
Total Table 3+ (17)
22,000
HFPO-DA
5,800
PFMOAA
410
Total Table 3+ (17)
11,000
HFPO-DA
3,800
PFMOAA
280
Total Table 3+ (17)
8,200
HFPO-DA
14,000
PFMOAA
3,100
Total Table 3+ (17)
65,000
HFPO-DA
1,900
PFMOAA
500 J
Total Table 3+ (17)
8,800
Waste Water Treatment
Plant Discharge
HFPO-DA
2,100
PFMOAA
190 J
Total Table 3+ (17)
5,000
HFPO-DA
1,600
PFMOAA
610 J
Total Table 3+ (17)
5,300
HFPO-DA
760
PFMOAA
1501
Total Table 3+ (17)
3,500
HFPO-DA
98,000
PFMOAA
22,000
Total Table 3+ (17)
220,000
HFPO-DA
1,700
PFMOAA
290
Total Table 3+ (17)
6,700
HFPO-DA
1,800
PFMOAA
510
Total Table 3+ (17)
8,000
HFPO-DA
45,000
PFMOAA
220,000
Total Table 3+ (17)
530,000
HFPO-DA
35,000
PFMOAA
190,000
Total Table 3+ (17)
450,000
HFPO-DA
390
PFMOAA
54
Total Table 3+ (17)
1,400
Legend
■ Stormwater Grab Sample Location
Discharge Areas
Wood Lined Trench
Waste Water Treatment Plant Discharge
Cooling Water Channel
Open Channel to Outfall 002
DuPont Area Ditches
Constituent
C
HFPO-DA
340 / 330
PFMOAA
48J/51
Total Table 3+ (17)
1,400 / 1,300
Result (ng/L) Duplicate Result (ng/L)
Notes:
HFPO-DA - Hexafluoropropylene oxide dimer acid
J - estimated value
ng/L - nanograms per liter
PFMOAA- Perfluoro-2-methoxyacetic acid
1. Samples collected in October 2019.
2. All concentrations are in ng/L.
3. Total Table 3+ (17) concentrations are summed over 17
compounds (excluding R-PSDA, Hydrolyzed PSDA, and R-EVE),
and include HFPO-DA results evaluated by EPA Method 537 Mod.
4. Non -detect values were not included in sum of total Table 3+
results.
5. Total Table 3+ results include J-qualified data.
6. Samples were filtered with a 0.2 pm filter
7. Aerial imagery provided by ESRI Basemaps, 2017.
500 250 0 500 Feet
Sitewide Stormwater - October 2019
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntecl>
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C 3500 and C 295
December 2020
Figure
B1

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
HFPO-DA
520
PFMOAA
22
Total Table 3+ (17)
810
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
2,900 J
PFMOAA
2501
Total Table 3+ (17)
5,200
HFPO-DA
3,600
PFMOAA
48
Total Table 3+ (17)
5,200
HFPO-DA
6,200
PFMOAA
1,100
Total Table 3+ (17)
18,000
HFPO-DA
1,000 J
PFMOAA
331
Total Table 3+ (17)
1,400
HFPO-DA
PFMOAA
14,000
7,600
Total Table 3+ (17) 33,000
HFPO-DA
1,100
PFMOAA
9.1
Total Table 3+ (17)
2,100
HFPO-DA
1,300
PFMOAA
480
Total Table 3+ (17)
4,900
HFPO-DA
PFMOAA
Total Table 3+ (17)
1,500
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
2,300J
PFMOAA
2,3001
Total Table 3+ (17)
10,000
5,100
77,000
100,000
HFPO-DA
300J
PFMOAA
12 J
Total Table 3+ (17)
530
HFPO-DA
3,500
PFMOAA
110,000
Total Table 3+ (17)
130,000
HFPO-DA
86,000
PFMOAA
14,000
Total Table 3+ (17)
430,000
32,000 J / 30,000 J
9,300 J / 8,900 J
73,000 / 69,000
9,600
2,100
22,000
HFPO-DA
1,800 J
PFMOAA
140 J
Total Table 3+ (17)
3,800
HFPO-DA
3,800J
PFMOAA
210J
Total Table 3+ (17)
13,000
HFPO-DA
PFMOAA
Total Table 3+ (17)
•
HFPO-DA
19,000J
PFMOAA
100,0001
Total Table 3+ (17)
180,000
HFPO-DA
15,000J
PFMOAA
12,000 J
Total Table 3+ (17)
160,000
210,000
1,600
330,000
HFPO-DA
860
PFMOAA
21
Total Table 3+ (17)
20,000
HFPO-DA
2,100
PFMOAA
49
Total Table 3+ (17)
12,000
HFPO-DA
12,000 J /
9,800 J
PFMOAA
250 J /
270 J
Total Table 3+ (17)
54,000 /
55,000
Legend
Stormwater Grab Sample Location
Source Area Types
Miscellaneous Inlets
Overhead Piping
Pavement
Pervious and Gravel Areas
Roof
Cooling Water Channel
Chemours Monomers IXM
0
•
■
Constituent -
HFPO-DA
12,000 J / 9,800 J
PFMOAA
250J/270J
Total Table 3+ (17)
54,000 / 55,000
Result (ng/L) Duplicate Result (ng/L)
Notes:
HFPO-DA- Hexafluoropropylene oxide dimer acid
IXM - ion exchange materials
J - estimated value
ng/L - nanograms per liter
PFMOAA- Perfluoro-2-methoxyacetic acid
1. Samples collected on March 5, 2020.
2. All concentrations are in ng/L.
3. Total Table 3+ (17) concentrations are summed over 17 compounds
(excluding R-PSDA, Hydrolyzed PSDA, and R-EVE), and include
HFPO-DA results evaluated by EPA Method 537 Mod.
4. Non -detect values were not included in sum of total Table 3+ results.
5. Total Table 3+ results include J-qualified data.
6. * - Location was not sampled during the March 5, 2020 sampling
event because location was either dry or water was stagnant.
7. „ - Due to a high level of visible sediment in the sample, the sample
was filtered in the laboratory using a 0.45 um filter prior to analysis.
8. Aerial imagery provided by ESRI Basemaps, 2017.
150 75
0 150 Feet
Chemours Monomers/IXM Area - March 2020
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec')
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
December 2020
Figure
B2
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units In Foot US

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
PFMOAA
Total Table 3+ (17)
HFPO-DA
280
PFMOAA
<5
Total Table 3+ (17)
280
Legend
Stormwater Grab Sample Location
Source Area Types
Miscellaneous Inlets
Pavement
■ Roof
Wood Lined Trench
Chemours Polymer Processing Aid (PPA) Area
Kuraray SentryGlas® Leased Area
Constituent —
HFPO-DA
260
PFMOAA
<5
Total Table 3+ (17)
260
Notes:
HFPO-DA - Hexafluoropropylene oxide dimer acid
ng/L - nanograms per liter
PFMOAA - Perfluoro-2-methoxyacetic acid
PPA - Polymer Processing Aid
Result
(ng/L)
1. Samples collected on March 5, 2020.
2. All concentrations are in ng/L.
3. Total Table 3+ (17) concentrations are summed over 17 compounds
(excluding R-PSDA, Hydrolyzed PSDA, and R-EVE), and include
HFPO-DA results evaluated by EPA Method 537 Mod.
4. Non -detect values were not included in sum of total Table 3+ results.
5. Total Table 3+ results include J-qualified data.
6. " - Location was not sampled during the March 5, 2020 sampling
event because location was either dry or water was stagnant.
7. "" - Due to a high level of visible sediment in the sample, the sample
was filtered in the laboratory using a 0.45 um filter prior to analysis.
8. Aerial imagery provided by ESRI Basemaps, 2017.
150 75 0 150 Feet
Kuraray SentryGlas and Chemours PPA Area —
March 2020 HFPO-DA, PFMOAA, and
Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec''
consultants
Raleigh
Geosyntec Consultants of NC, P.C.
NC License No.: C 3500 and C 295
December 2020
Figure
B3
r,e,eeooa IVALI,yns rateraneNorm ,aroinarira ZUV ee,unis roof

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
\Quarterly Reports \06 Oc
0.4
Cumulative Rainfall (in)
10/16/2019 Total Rainfall
Sampling
O Nu710 Q OC�7 Ls) N 10Q COO NQ100 O Cs) � N10 0
10O N 0100O M 10 N10O Ls)
O N L 100 O CO ID N10 O M O N0r 0p C710 N10
0 0 0 r r N N N CO CO d I-0 I-0 CD CD M1 M1 h 00 CO CA CA 0 0 O r r N N N CO CO LO u7 CD U3 M1 M1 M1 CO 03 CA CA O O O r r N N N C7 Cif
CN N N N N N N N N N
Notes:
Stormwater samples collected between 9:50 AM and 12:45 PM on October 16, 2019
Rainfall data obtained from Chemours Fayetteville meteorological station
Time
Cumulative Rainfall on 10/16/2019 at Chemours Fayetteville
Chemours Fayetteville Works, North Carolina
Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh
December 2020
Figure
B4

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
J
1 e+05
0
le+03
a 1 e+01
U
1e+05
1e+03
le+01
Sitewide Stormwater Sampling Locations
Hum
11111111111/6
IiIIII.IIIIIIIIIIIIuIuIIIIIIuI1-uII
1111111111111111111111111111111/11
sy
ca
V�r0L ;13 9L 0h �3 ri> r153 00 0^ JQ n;ti JQ o3 0� �^ 00 0ter\ �;1, �3 ON o 1, o ‘)S.�� h <01, )1 �o
o�p �p 3 op'
op'
op
^� 3 0 0
m
O
6
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m
0
D
D
Location
+E elgel Imo'
Legend Notes:
-Stormwater samples were collected 10/16/2020
EL Chemours Monomers/IXM Area -Total Table 3+ is calculated as the sum of 17
IKuraray SentryGlas/Chemours PPA Area compounds
Other -Four locations had three timeseries samples
collected. Denoted in order of sample time as "-1 ",
'-2", and "-3".
-Samples were filtered with a 0.2 pm filter
Acronyms:
ng/L: nanograms per liter
DUP: duplicate sample
Sitewide Stormwater Samples by Location
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec°
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh
December 2020
Figure
B5

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Concentration (ng/L)
1e+05
1e+04
1e+03
1e+02
1e+01
1e+05
1e+04
1e+03
1e+02
1e+01
1e+05
1e+04
1e+03
1e+02
1e+01
e—
e—
I—
r
HFPO-DA PFMOAA Total Table 3+
r
r
L—
r
r
i
I
1 I
I
m—
m—
r
L—
L—
eta
Notes:
-Stormwater samples were collected 10/16/2020
-Total Table 3+ is calculated as the sum of 17 compounds
-Where duplicate samples were collected, the highest value is used
-Where timeseries samples were collected, the average is used
-Samples were filtered with a 0.2 pm filter
Acronyms:
ng/L: nanograms per liter
Sitewide Stormwater Samples by Site Region
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec )
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh
December 2020
Figure
B6

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
\Quarterly Repeats \06 Oc
Cumulative Rainfall (in)
3/5/2020 Total Rainfall
07
06
0,5 —
0, 4 —
0 3 —
0 2 —
1 1
1 1
1 1
I I
Sampling
1 I
I I
I I
I I
I I
1 1
I I
I I
0.1- -r
I 1
I 1
0 - I I� • I I I I I I • I I I • I I I • I I • I I I I
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 CO) 0 «) 0 CO0 CO 0 «) 0 CO0 CO 0 «) 0 CO0 CO 0 «) 0 CO0 CO 0 «) 0 CO0 CO 0 «) 0 CO0 CO 0 «) 0 CO O CO 0 CO0 CO
0 O r r N N (+'] f+7 cI7 cf7 CO CO r,- h CO CO m 6! O 6 r r N N M M c[] N'] CO (fl l� f` CO CO 6] 6] O b r r N CV 0.1
CV N N N N N N N
Time
Notes:
Stormwater samples collected between 10:45 AM and 3:30 PM on March 5, 2020
Rainfall data obtained from USGS National Water Information System due to power outage onsite
Rainfall Intensity on 3/5/2020 at USGS station 02105500
Chemours Fayetteville Works, North Carolina
Geosyntec)
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C 3500 and C 295
Raleigh December 2020
Figure
B7

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
le+05
1e+03
le+01
1e+05
le+03
1e+01
Chemours Monomers IXM Area
Kuraray SentryGlas Leased Area and Chemours PPA
2
m
O
6
D
PFMOAA
Total Table 3+
1.
Location
Cb
co
Legend
■
•
•
•
•
■
■
Miscellaneous Inlet
Overhead Piping
Pavement
Pavement and Pervious/Gravel
Pervious/Gravel
Roof
Roof, Pavement, and Overhead Piping
Roof, Pervious/Gravel, and Pavement
Roof,Pervious/Gravel, Pavement, and
Overhead Piping
Notes:
-Stormwater samples were collected 3/5/2020
-Total Table 3+ is calculated as the sum of 17 compounds
* Due to a high level of visible sediment in the samples at
location 68 and 85, the samples were filtered in the laboratory
using a 0.45 um filter prior to analysis.
Acronyms:
ng/L: nanograms per liter
DUP: duplicate sample
Targeted Surface Type Samples by Location
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec C'
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh
December 2020
Figure
B8

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Chemours Monomers IXM Area
Kuraray SentryGlas Leased Area and Chemours PPA
1 e+05
r
HFPO-DA
r
1 e+04
I
1 e+03
- —
1 e+02 -i-
1 e+01 -r_
�A
1-
J
E- 1 e+05
[
•
PFMO/
0 1 e+04
r
1-
I
l e+03
r
•
a 1e+02--
_
— -
>
0 1 e+01 -c
C
,
0
E
E
1 e+05 ,r
I I I I
o
1e+04r
�'
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1 e+03
r 1
v
cr
1e+02T
1e+01 -I-c
1-
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+
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�o�� �aQ'� ���� ��\�` e` oott Q:�`<���� ���� Q:Q`� �o� �-4ecs-
��`'0���� owe, Q ee`�\� �� eea-oo�a a` \ re' \� e, Q
5 G
Sao Q��cao
qo
Notes:
Stormwater samples were collected 3/5/2020
-Total Table 3+ is calculated as the sum of 17 compounds
-Where duplicate samples were collected, the highest value was used
-Results from locations 68 and 85 have been omitted from the figure. Due to a high level of visible
sediment in the samples at location 68 and 85, the samples were filtered in the laboratory using a
0.45 um filter prior to analysis.
Acronyms:
ng/L: nanograms per liter
Targeted Surface Type Samples by Source Area Type
HFPO-DA, PFMOAA, and Total Table 3+ Results
Chemours Fayetteville Works, North Carolina
Geosyntec coosyntecConsultants ofNC, PC.
NC License No.: C 3500 and C 295
consultants
Figure
B9
Raleigh
December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
1e+05
le+03
1e+01
le+05
0)
g le+03
c
a)
c 1 e+01
0
U
le+05
le+03
1e+01
HFPO-DA
PFMOAA
Total Table 3+
iii���11111■�
Oct;L 0d)n)
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OR' & Je
\.O NO OcD`''O
NO
Location
OCo JQ
\O O�eO
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1�
Off'
Legend
Total
El Dissolved
Notes:
-Stormwater samples were collected 3/5/2020
-Total Table 3+ is calculated as the sum of 17 compounds
Acronyms:
ng/L: nanograms per liter
DUP: duplicate sample
Dissolved vs. Total
HFPO-DA, PFMOAA, and Total Table 3+ Concentrations
Chemours Fayetteville Works, North Carolina
Geosyntec
consultants
Geosyntec Consultants of NC, P.C.
NC License No.: C-3500 and C-295
Raleigh
December 2020
Figure
B10

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
ATTACHMENT A: Field Forms
15 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-1
Title Combined_Location_ID
sampling_date
sampling_time
samplers
55
10-16-2019
09:48
CHARLES PACE
52
10-16-2019
10:10
CHARLES PACE
10
10-16-2019
10:30
CHARLES PACE
40
10-16-2019
10:42
CHARLES PACE
41
10-16-2019
10:45
CHARLES PACE
2
10-16-2019
11:00
CHARLES PACE
25
10-16-2019
11:05
CHARLES PACE
3
10-16-2019
11:10
CHARLES PACE
27
10-16-2019
11:25
CHARLES PACE
28
10-16-2019
11:30
CHARLES PACE
5
10-16-2019
11:50
CHARLES PACE
30
10-16-2019
11:55
CHARLES PACE
31
10-16-2019
12:10
CHARLES PACE
32
10-16-2019
12:20
CHARLES PACE
34
10-16-2019
12:45
CHARLES PACE
33
10-16-2019
12:40
CHARLES PACE
54
10-16-2019
12:55
CHARLES PACE
36
10-16-2019
13:05
CHARLES PACE
13
10-16-2019
13:20
CHARLES PACE
37
10-16-2019
13:27
CHARLES PACE
39
10-16-2019
13:50
BRANDON WEIDNER
38
10-16-2019
13:35
BRANDON WEIDNER
35
10-16-2019
13:20
BRANDON WEIDNER
42
10-16-2019
10:26
BRANDON WEIDNER
35
10-16-2019
10:55
BRANDON WEIDNER
38
10-16-2019
11:13
BRANDON WEIDNER
39
10-16-2019
11:23 I
BRANDON WEIDNER
42
10-16-2019
11:50
BRANDON WEIDNER
35
10-16-2019
12:10
BRANDON WEIDNER
38
10-16-2019
12:25
BRANDON WEIDNER
39
10-16-2019
12:35
BRANDON WEIDNER
42
10-16-2019
12:45
BRANDON WEIDNER

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-1
additional sky precip air_temp wind sampling_method Sample_pH
Cloudy Rain
65
5
Grab
4.95
Cloudy Rain 68
5
Grab
5.36
Cloudy Rain 66
6 Grab
5.68
Cloudy Rain 66 6 Grab
5.86
Cloudy Rain 66 6 Grab
5.9
Cloudy Rain 66 6 Grab
6.09
Cloudy Rain 67 6 Grab
5.97
Cloudy Rain 67 6 Grab
6
Cloudy Rain 67 6 Grab 6.07
Cloudy Rain 67 6 Grab 6.07
Cloudy Rain 69 6 Grab 6.36
Cloudy Rain 69 6 Grab 5.85
Cloudy Rain 70 8 Grab 5.83
Cloudy Rain 70 8 Grab 6.26
Cloudy None 70 8 Grab 6.34
Cloudy None 70 8 Grab 6.25
Cloudy None 70 8 Grab 6.55
Cloudy None 70 8 Grab 6.57
Cloudy Rain 70 8 Grab 6.69
Cloudy None 72 9 Grab 6.43
Ed M. Cloudy None 71 5 Grab 6.78
Cloudy None 71 3 Grab 6.07
Cloudy None 72 2 Grab 6.71
Ed M. Cloudy Rain 66 3 Grab 5.4
Ed M. Cloudy None 67 6 Grab 5.81
Ed M. Cloudy Rain 68 3 Grab 5.91
Ed M. Cloudy Rain 68 3 Grab 6.28
Ed M. Cloudy None 69 5 Grab 6.55
Cloudy None 70 5 Grab 6.52
Cloudy None 70 3 Grab 6.46
Ed M. Cloudy None 70 4 Grab 6.71
Cloudy None
Grab 6.72

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-1
Sample_TDS Sample_Tubidity obs_spl_Iocation obs_misc
0.066
255
0.023
608
0.037 53.5 Taken further up from road because of vac truck
0.057
11.3
0.049
80
0.027 100
0.016 16.2
0.011 136
0.012 1000 Great deal of leaf litter in ditch
0.014 105
0.016 15.4
0.024 151
0.013 154 MS/REP/DUP
0.019 1000 MS REP DUP
0.032 890
0.026 822
0.023 1000
0.036 12.1
0.017 9.5
0.05 1000
0.047 0.8 TS3
0.026 0.2 TS3
0.025 86.4 TS3
0.048 16.3 Took from larger white plastic pipe (East side)
0.024 66.4 Taken from opposing side of 35
0.036 14.4
0.061 1.8
0.023 13.2 TS2
0.023 52.4 TS2
0.032 0 TS2
0.049 7.2 TS2
0.03 7 TS3

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-1
Item Type
Path
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data
Item
sites/Field Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater Sampling_Data
Item
sites/Field_Tablet_Monitoring_Data/Lists/Fayetteville_Stormwater_Sampling_Data

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2025
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
52.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.72
0.15
7.99
Observation of Sample Location
Flow from pipe
Location ID:
42
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:20
1.8
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
52.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.85
0.13
126.35
Observation of Sample Location
Flow from pipe
Location ID:
43
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:30
2.1
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
50.00
Cloudy
Rain
4.00
Sampling Method:
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.71
0.00
1.83
Observation of Sample Location
250m1/6.56s
Sample from roof of building
Location ID:
58
Project Manager:
Sampling Time:
Tracy Ovbey
12:45
Flow Rate:
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.60
0.03
33.56
Observation of Sample Location
Location ID:
59
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
12:50
Photo at Sample Location
250m1/10.45s flow rate
Sample, most likely from pavement
Miscellaneous Observations
R*R5DN5

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.66
0.02
1.72
Observation of Sample Location
Location ID:
60
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
12:55
Photo at Sample Location
250m1/12s flow rate
Sample coming from roof of building
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
2.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.83
0.11
139.87
Observation of Sample Location
Location ID:
61
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:15
Photo at Sample Location
Sample taken from beneath grate. Flow coming from gravel/sand/grass field to the NW
Couldn't pet flow to multiple entry locations into grate.
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
8.39
0.12
49.77
Observation of Sample Location
Location ID:
62
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
15:00
0.3
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
52.00
Cloudy
Rain
6.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.99
0.23
189.88
Observation of Sample Location
Location ID:
63
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
10:45
Photo at Sample Location
Collected sample from water flowing into drainage ditch. Water flowing from gravel area to the north. Could not
get flow rate.
Sample from imperious surface
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
8.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.22
0.01
4.34
Observation of Sample Location
250m1/4.79s flow rate
Sample coming from gravel area west of pipe, sampled from pipe.
Location ID:
63A
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
13:45
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
8.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.28
0.02
38.70
Observation of Sample Location
Sample flowing from gravel area south of colvert
Location ID:
64
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
13:20
3
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
51.00
Cloudy
Rain
8.00
Location ID:
65
Project Manager:
Sampling Time:
Tracy Ovbey
13:30
Sampling Method:
Grab
Flow Rate:
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.52
0.04
338.00
Observation of Sample Location
Photo at Sample Location
Sample coming from gravel area south of colvert and also from pavement (road) west of location
Rate: can't get flow rate due to rocks
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.08
0.01
1.64
Observation of Sample Location
Location ID:
66
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
13:50
Photo at Sample Location
Sample from roof of building
250m1/1 min
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.03
0.02
1.61
Observation of Sample Location
Sample from roof
Flow rate: 250m1/26.34s
Location ID:
67
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:00
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
6.70
0.04
420.72
Observation of Sample Location
Sample coming from pavement to the NW of grate
Unable to get flow rate due to multiple entry's into grate
Location ID:
68
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:30
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.69
0.02
23.73
Observation of Sample Location
No flow due to multiple entry ways
Sample from pavement coming from road and processing area
Location ID:
69
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:40
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.55
0.05
32.54
Observation of Sample Location
No flow rate
Sample coming from runoff from gravel area
Location ID:
70
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:50
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
52.00
Cloudy
Rain
4.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.85
0.13
163.16
Observation of Sample Location
Location ID:
71
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
13:20
0.3
liters per minute
Photo at Sample Location
Sample taken by dip rod. Flow coming from crack in the concrete, seeping from puddles around grate
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
3.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.79
0.10
2.57
Observation of Sample Location
Location ID:
72
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:10
0.2
liters per minute
Photo at Sample Location
Flow from roof
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
3.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.76
0.06
0.54
Observation of Sample Location
Flow from roof
Location ID:
73
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:00
0.3
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
6.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.54
0.06
0.30
Observation of Sample Location
Water coming from room
Location ID:
75
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:30
0.2
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
6.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.69
0.16
4.51
Observation of Sample Location
Flow from roof top
Location ID:
76
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
14:00
0.2
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
53.00
Cloudy
Rain
6.00
Sampling Method:
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.52
0.04
29.75
Observation of Sample Location
Flow coming from road run off into drain
Location ID:
77
Project Manager:
Sampling Time:
Tracy Ovbey
12:50
Flow Rate:
0.5
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
LUKE TARTIOTHER, Danielle Delgado
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
52.00
Cloudy
Rain
5.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.25
0.05
1.29
Observation of Sample Location
Location ID:
78
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
12:40
0.1
liters per minute
Photo at Sample Location
Flow estimated by volume in tray after 30 seconds, sample taken from downspout from steel tray attached below
overhead pipes. Sample taken from HDPE tray seen in photo.
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
51.00
Cloudy
Rain
5.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.68
0.05
28.28
Observation of Sample Location
Location ID:
79
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:40
Photo at Sample Location
Sample coming from location 79. Under from trailer and into grate. Unclear if coming from pipe or from pool
after the pipe.
Couldn't get flow due to multiple entry points
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
BRANDON WEIDNERICHARLES PACE,
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
50.00
Cloudy
Rain
5.00
Sampling Method:
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
8.04
0.07
99.64
Observation of Sample Location
Location ID:
80
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:45
1
Photo at Sample Location
I It")
& -0301
Sample coming from imperious surface. Loading/unloading area at IXM.
Couldn't pet flow due to multiple entrys into grate
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
Location ID:
KEN STUART,
83
Project Manager:
Sampling Date:
03-05-2020
Sampling Time:
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
8.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.27
0.07
15.24
Observation of Sample Location
Flow Rate:
Tracy Ovbey
14:15
1.1
liters per minute
Photo at Sample Location
drain from ppa lab gutter, closest to ppa
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
Location ID:
KEN STUART,
84
Project Manager:
Sampling Date:
03-05-2020
Sampling Time:
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
8.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.13
0.05
15.97
Observation of Sample Location
Flow Rate:
Tracy Ovbey
12:20
1.7
liters per minute
Photo at Sample Location
sentry glass sheet flow sampled with dip rod at pipe in ditch, located adjacent to ppa
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
Location ID:
KEN STUART,
85
Project Manager:
Sampling Date:
03-05-2020
Sampling Time:
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
6.53
0.01
27.82
Observation of Sample Location
location flows into wood lined ditch, very It rain
Flow Rate:
Tracy Ovbey
15:30
0.2
liters per minute
Photo at Sample Location
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
flow through the gravel
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
Location ID:
KEN STUART,
86
Project Manager:
Sampling Date:
03-05-2020
Sampling Time:
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
50.00
Cloudy
Rain
7.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
6.87
0.10
5.82
Observation of Sample Location
Flow Rate:
Tracy Ovbey
13:43
0.1
liters per minute
Photo at Sample Location
pipe coming from trailer roof at ppa. The pipe is the one closest to ppa not the entrance
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
flow was 0.061 liter per minute
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
KEN STUART, Ryan Gableman
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
52.00
Cloudy
Rain
7.00
Sampling Method:
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
7.59
0.07
4.13
Observation of Sample Location
Location ID:
87
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
11:40
13.2
liters per minute
Photo at Sample Location
Roof drain pipe drain from Sentry glass facing PPA
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
coordinates later
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
Site Name:
Samplers:
STORMWATER SAMPLING RECORD
Chemours Fayetteville
KEN STUART, Ryan Gableman
Sampling Date:
03-05-2020
WEATHER CONDITIONS
Temperature (F):
Sky:
Precipitation:
Wind (mph)
Sampling Method:
49.00
Cloudy
Rain
8.00
Grab
pH
Total
Dissolved
Solids
Turbidity
mg/L
NTU
6.87
0.00
4.11
Observation of Sample Location
Location ID:
88
Project Manager:
Sampling Time:
Flow Rate:
Tracy Ovbey
15:06
Photo at Sample Location
second to last drainage pipe from roof at sentry glass, behind towards main gate
Miscellaneous Observations
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Attachment A-2
could not measure flow, likely about 5 liters per minute
PARSONS

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
ATTACHMENT B: Table 3+ Analytical Results
16 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B1
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC10
LOC13
LOC2
LOC25
LOC27
LOC28
LOC3
LOC30
LOC31
LOC31
LOC32
Field Sample ID
ASTW-LOC10-101619
ASTW-LOC13-101619
ASTW-LOC2-101619
ASTW-LOC25-101619
ASTW-LOC27-101619
ASTW-LOC28-101619
ASTW-LOC3-101619
ASTW-LOC30-101619
ASTW-LOC31-101619
ASTW-LOC31-101619-D
ASTW-LOC32-101619
Sample Date
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
QA/QC
DUP
Sample Matrix
LIQUID
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Sample Delivery Group (SDG)
320-55408-1
320-55403-1
320-55413-1
320-55413-1
320-55413-1
320-55413-1
320-55413-1
320-55413-1
320-55401-1
320-55401-1
320-55401-1
Lab Sample ID
320-55408-2
320-55403-5
320-55413-2
320-55413-3
320-55413-4
320-55413-5
320-55413-1
320-55413-6
320-55401-2
320-55401-3
320-55401-4
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
98,000
760
1,500
820
1,100
480
2,300
4,900
340
330
2,900 J
PFMOAA
22,000
150 J
56 J
16
150
37
250 J
2,400
48 J
51
550
PF02HxA
25,000
350
230
54
230
99
170
2,000
70
68
690
PF030A
14,000
160
43
16
170 J
27
97
2,600
16
16
610
PFO4DA
12,000
150
35
9.5
260
35
120
2,600
15
14
800
PFO5DA
9,700
96 J
18 J
5.9
280 J
33
48
1,500
15
15
630
PMPA
7,000
1,100
450
320
650
500 J
290
2,900
550
530
840
PEPA
3,400
440
160
57
400
210
110
1,300
260
260
390
PS Acid
2,900
68
3.7
<2
53
4.6
11
180
4.1
4.4
9,600
Hydro -PS Acid
9,300
52
18
4.4
47
11
22
450 J
14
14
40,000
R-PSDA
5,200
270 J
120 J
41 J
500 J
69 J
170 J
1,100
53 J
56 J
490
Hydrolyzed PSDA
4,300 J
350 J
22 J
9.2 J
170 J
29 J
110 J
1,900
15 J
16 J
3,300
R-PSDCA
380
<2
<2
<2
4.6
<2
<2
15
<2
<2
76
NVHOS
4,500
25
7.3
3.6
18
7.2
15
190
5.1
5
220
EVE Acid
5,700
55
14
8.2
32
7.9
19
150
8.4
8.5
63
Hydro -EVE Acid
3,900
63
17
9.5
68
9.2
39
490
13
13
110
R-EVE
2,700
200 J
96 J
43 J
150 J
56 J
110 J
1,000
95 J
98 J
84
PES
<23
<2
<2
<2
<2
<2
<2
<2
<2
<2
<23
PFECA B
<30
<2
<2
<2
<2
<2
<2
<2
<2
<2
<30
PFECA-G
<20
<2
<2 UJ
<2 UJ
<2 UJ
<2
<2 UJ
<2
<2
<2
<20
Total Table 3+ (17 compounds)
220,000
3,500
2,600
1,300
3,500
1,500
3,500
22,000
1,400
1,300
57,000
Total Table 3+ (20 compounds)
230,000
4,300
2,800
1,400
4,300
1,600
3,900
26,000
1,500
1,500
61,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<18
<2
<2
<2
5.6
<2
<3.5
<8.8
<2
<2
<3.6
11C1-PF3OUdS
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<6.1
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<190
<20
<20
<20
<20
<20
<36
<93
<20
<20
<38
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<49
<48
<24
<24
<24
<95
<240
<24
<25
<100
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
--
--
--
--
--
--
--
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
--
--
--
--
--
--
--
<4
<4
<4
6:2 Fluorotelomer sulfonate
<190
<20
<20
<20
<20
<20
<36
<93
<20
<20
<38
9C1-PF3ONS
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<4.6
ADONA
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<3.6
NaDONA
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<3.6
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
<36
N-ethylperfluoro-1-octanesulfonamide
<2
--
--
--
--
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
--
--
--
--
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
<59
Perfluorobutane Sulfonic Acid
2.2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorobutanoic Acid
980
65
17
7.1
41
19
9
72
10
10
48
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<6.1
Perfluorodecanoic Acid
7.4
<2
<2
<2
6.8
3.1
<2
<2
<2
<2
3.6 J
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<8.6
Perfluorododecanoic Acid
3.3
<2
<2
<2
6.1
<2
<2
<2
<2
<2
2.2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<3.6
Perfluoroheptanoic Acid
130
4.2
5.2
<2
12
2.8
8.5
23
3.8
4.1
110 J
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
2.3
<2
<2
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
12
<2
<2
<2
<2
<2
<2
Perfluorohexanoic Acid
290
6.6
5.6
2.2
16
5.4
6.6
12
4
3.9
32
Perfluorononanesulfonic acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<3.1
Perfluorononanoic Acid
33
3
<2
<2
4
<2
<2
5.9
<2
<2
21
Perfluorooctadecanoic acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentanoic Acid
1,000
12
7.3
3.3
24
7.9
7.4
39
4.7
5.1
250
Perfluorotetradecanoic Acid
2.3
<2
<2
<2
8.5
<2
<2
<2
<2
<2
<2
Perfluorotridecanoic Acid
4.1
<2
<2
<2
7.5
: 2
<2
<2
<2
<2
2.5
Perfluoroundecanoic Acid
11
3
<2
<2
3.7
2.4
<2
<2
<2
<2
<21
PFOA
97
8.4
31
15
59
11
81
130
35
36
5,700 J
PFOS
3.9
2.2
<2
<2
62
2.7
3.8
<2
<2
<2
<11
Page 1 of 4 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B1
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC32
LOC33
LOC34
LOC35
LOC35
LOC35
LOC36
LOC37
LOC38
LOC38
LOC38
Field Sample ID
ASTW-LOC32-101619-D
ASTW-LOC33-101619
ASTW-LOC34-101619
ASTW-LOC35-1-101619
ASTW-LOC35-2-101619
ASTW-LOC35-3-101619
ASTW-LOC36-101619
ASTW-LOC37-101619
ASTW-LOC38-1-101619
ASTW-LOC38-2-101619
ASTW-LOC38-3-101619
Sample Date
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
QA/QC
DUP
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
LIQUID
Liquid
Liquid
Liquid
LIQUID
LIQUID
Sample Delivery Group (SDG)
320-55401-1
320-55403-1
320-55403-1
320-55416-1
320-55416-1
320-55411-1
320-55403-1
320-55403-1
320-55416-1
320-55411-1
320-55411-1
Lab Sample ID
320-55401-5
320-55403-1
320-55403-2
320-55416-2
320-55416-6
320-55411-4
320-55403-3
320-55403-4
320-55416-3
320-55411-1
320-55411-5
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
2,300 J
3,800
1,900
1,300
1,400
1,600
2,100
14,000
1,700
2,200
1,800
PFMOAA
600
280
500 J
380 J
330
610 J
190 J
3,100
290
640
510
PF02HxA
700
530
590 J
250
230
320 J
320
3,100
500
710
610
PF030A
620
200
230 J
120
91
130 J
72
6,100
330
480
400
PFO4DA
860
260
420
150
99
140 J
140
11,000
420
560
510
PFO5DA
800
410 J
1,300
200 J
120
170 J
150 J
5,200
320
560
470
PMPA
870
1,400
1,700
970
860
910 J
1,200
8,500
1,900
1,900
1,700
PEPA
380
560
700 J
500 J
420
500 J
610 J
4,000
870
830
770
PS Acid
11,000
110
160 J
91
110
160 J
6.9
1,400
68
860
780
Hydro -PS Acid
42,000
360
890
280 J
230
450 J
170
1,900
130
210
170
R-PSDA
500
790 J
1,300
650 J
690 J
170 J
330 J
490
410 J
280 J
210 J
Hydrolyzed PSDA
3,600
280 J
1,200
1,200
1,600
930 J
33 J
1,700
750 J
1,100
850
R-PSDCA
76
18
21
5.2
5
9.1 J
2.6
44
4.1
6.6
5.3
NVHOS
230
67
130
85
97
160 J
26
200
32
40
33
EVE Acid
61
69
140
38
33
47 J
14
260
57
160
130
Hydro -EVE Acid
110
110
160
52
40
53 J
46
5,700
93
110
85
R-EVE
80
340 J
540
230 J
180 J
56 J
210 J
620
310 J
140
110
PES
<23
<2
<2
<2
<2
<4.6 UJ
<2
<4.6
<2
<2.3
<2.3
PFECA B
<30
<2
<2
<2
<2
<6 UJ
2.3
<6
<2
<3
<3
PFECA-G
<20
<2
<2 UJ
<2 UJ
<2
<4.1 UJ
<2
<4.1
<2
<2
<2
Total Table 3+ (17 compounds)
61,000
8,200
8,800
4,400
4,100
5,300
5,000
65,000
6,700
9,300
8,000
Total Table 3+ (20 compounds)
65,000
9,600
12,000
6,500
6,500
6,400
5,600
67,000
8,200
11,000
9,100
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<3.7
<3.5
<3.6
<2
<2
<2
<2
<2
<2
<3.4
<2
11C1-PF3OUdS
<6.2
<5.9
<2
<2
<2
<2
<2
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<39
<37
<38
<20
<20
<20
<20
<20
<20
<36
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<100
<96
<98
<49
<50
<48
<49
<500
<48
<94
<48
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
--
--
--
--
<2
--
--
--
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
--
--
--
--
<4
--
--
--
<4
<4
6:2 Fluorotelomer sulfonate
<39
<20
<38
<20
<20
<20
<20
<20
<20
<36
<20
9C1-PF3ONS
<4.7
<4.5
<2
<2
<2
<2
<2
<2
<2
<2
<2
ADONA
<3.7
<3.5
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
NaDONA
<3.7
<3.5
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<37
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
N-e y per uoro-l-octanesu onami e
<2
--
--
--
--
<2
--
--
--
<2
<2
N-methyl per uoro-l-octanesu onami a
<2
--
-
--
--
<2
--
--
--
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<58
<20
<20
<20
<20
<20
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<3.7
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorobutanoic Acid
47
71
120
43
37
56
40
200
120
120
110
Perfluorodecane Sulfonic Acid
<6.2
<5.9
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorodecanoic Acid
<6
7.8
7.8
2.8
2.3
3.9
<2
3.3
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<8.7
<8.3
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<10
2.7
<2
<2
<2
<2
<2
2.7
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<3.7
<3.5
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoroheptanoic Acid
88 J
120
21
5.6
5.4
6.6
4.1
63
6.2
7.1
6.4
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<3.2
2.7
<2
<2
<2
<2
2.7
<2
<2
<2
Perfluorohexanoic Acid
22
40
15
9.8
9.6
14
4.5
29
9.4
8.9
8.7
Perfluorononanesulfonic acid
<3.1
<3
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorononanoic Acid
19
10
12
3.5
2.6
3.7
2.9
20
3.1
3.5
3.4
Perfluorooctadecanoic acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<5.6
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentanoic Acid
230
73
85
18
15
21
21
75
19
21
19
Perfluorotetradecanoic Acid
<2
<2
<2
<2
<2
<2
<2
<2
3.1
<2
<2
Perfluorotridecanoic Acid
2
<24
2.7
<2
<2
<2
<2
<2
2.4
<2
<2
Perfluoroundecanoic Acid
<21
<20
11
3.9
2.6
4
3.2
3.1
2.7
<2
<2
PFOA
4,100 J
7,300
940
36
110
63
8
19
9.7
9.9
10
PFOS
17
13
30
3.1
2.7
2.9
<2
3.9
3.5
2.5
2.4
Page 2 of 4
October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B1
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC39
LOC39
LOC39
LOC40
LOC41
LOC42
LOC42
LOC42
LOCS
L0052
L0054
Field Sample ID
ASTW-LOC39-1-101619
ASTW-LOC39-2-101619
ASTW-LOC39-3-101619
ASTW-LOC40-101619
ASTW-LOC41-101619
ASTW-LOC42-1-101619
ASTW-LOC42-2-101619
ASTW-LOC42-3-101619
ASTW-L005-101619
ASTW-L0052-101619
ASTW-L0054-101619
Sample Date
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
10/16/2019
QA/QC
Sample Matrix
Liquid
LIQUID
LIQUID
Liquid
LIQUID
Liquid
Liquid
LIQUID
Liquid
LIQUID
LIQUID
Sample Delivery Group (SDG)
320-55416-1
320-55411-1
320-55411-1
320-55403-1
320-55408-1
320-55416-1
320-55416-1
320-55411-1
320-55401-1
320-55408-1
320-55408-1
Lab Sample ID
320-55416-4
320-55411-2
320-55411-6
320-55403-6
320-55408-1
320-55416-1
320-55416-5
320-55411-3
320-55401-1
320-55408-3
320-55408-4
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
420
390
370
5,900
5,800
45,000
33,000
35,000
180
23,000
80,000
PFMOAA
57 J
54
48
350 J
410
220,000
130,000
190,000
<5
3,100
650
PF02HxA
150
130
130
310 J
280
68,000
41,000
53,000
39
6,600
2,300
PF030A
52
41
43
180
180
48,000
30,000
40,000
7
2,200
1,500
PFO4DA
37
28
29
240 J
230
46,000
30,000
37,000
7.2
1,200
1,900
PFO5DA
14
20
19
110 J
130
26,000
16,000
22,000
13
1,200
3,200
PMPA
490
510
500
2,800
2,500
6,900
4,400
5,100
230
4,300
2,200
PEPA
190
180
190
1,100
1,000
8,500
7,600
8,100
79
1,800
950
PS Acid
2.8
3.4
3.3
58
54
2,700
1,300
1,900
2.4
29,000
320 J
Hydro -PS Acid
22
22
23
89
80
5,300
3,600
4,300
7.6
3,900
1,500
R-PSDA
120 J
75 J
83 J
160 J
55
1,500
1,500
2,400
19 J
5,300
3,100
Hydrolyzed PSDA
29 J
22 J
20 J
300 J
110 J
7,600
4,700
7,000
10 J
43,000 J
950 J
R-PSDCA
<2
<2
<2
2.1
<3.1
170
160
220
<2
71
110
NVHOS
7.9
7.4
7.8
39 J
43
2,600
1,900
2,400
3.1
1,800
360
EVE Acid
13
14
12
44
55
14,000
15,000
16,000
11
5,600
520
Hydro -EVE Acid
23
22
21
120 J
130
33,000
30,000
33,000
8.5
1,200
320
R-EVE
69 J
44 J
41 J
210 J
80 J
2,800
2,300
2,500
31 J
2,100
1,200
PES
<2
<2
<2
<2
<9.2
<92
<46
<46
<2
<46
26
PFECA B
<2
<2
<2
<2
<12
<120
<60
<60
<2
<60
<12
PFECA-G
<2
<2
<2
<2
<8.2
<82
<41
<41
<2
<41
<8.2
Total Table 3+ (17 compounds)
1,500
1,400
1,400
11,000
11,000
530,000
340,000
450,000
590
85,000
96,000
Total Table 3+ (20 compounds)
1,700
1,600
1,500
12,000
11,000
540,000
350,000
460,000
650
140,000
100,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<9.1
<8.6
<18
<19
<17
<2
<18
<2
11C1-PF3OUdS
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<96
<91
<190
<200
<180
<20
<190
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<25
<23
<20
<250
<240
<20
<20
<20
<20
<490
<2,600
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
--
<2
<2
--
<2
--
--
<2
<2
<2
<4.3
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
--
<4
<4
--
<4
--
--
<4
<4
<4
<7
6:2 Fluorotelomer sulfonate
<20
<20
<20
<96
<91
<190
<200
<180
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
NaDONA
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
--
<2
<2
--
<2
--
--
<2
<2
<2
<4.4
N-methyl perfluoro-l-octanesulfonamide
--
<2
<2
--
<2
--
--
<2
<2
<2
<2.2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
4.3
3.4
<2
<2
<2
2.4
<2
<2
Perfluorobutanoic Acid
41
40
41
48
47
340
210
300
5.3
84
930
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorodecanoic Acid
2.6
2.3
2.1
<2
<2
9.1
6.2
7.8
<2
7.9
33
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2.3
Perfluorododecanoic Acid
<2
2.4
<2
<2
2.7
6.9
5.3
8.9
<2
29
17
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoroheptanoic Acid
25
17
17
22
19
270
150
240
<2
13
220
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
<2
3.4
3.3
2.8
<2
4.7
<4.5
Perfluorohexane Sulfonic Acid
2.2
<2
2
5.6
4.5
<2
<2
<2
<2
<2
5.4
Perfluorohexanoic Acid
29
20
21
31
28
61
38
53
2
14
190
Perfluorononanesulfonic acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluorononanoic Acid
4.2
4.3
3.7
2.7
2.4
160
110
140
<2
9.4
120
Perfluorooctadecanoic acid
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2.3
Perfluorooctane Sulfonamide
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
<2
Perfluoropentanoic Acid
29
20
20
38
34
430
280
370
2.5
52
1,500
Perfluorotetradecanoic Acid
<2
<2
<2
<2
3.1
5.6
4.5
6.2
<2
25
I4
Perfluorotridecanoic Acid
<2
<2
<2
<2
3.5
9.6
9.8
22
<2
14
39
Perfluoroundecanoic Acid
<2
2.1
<2
<2
<2
26
23
49
<2
9.9
35
PFOA
18
14
14
15
15
36
26
32
9.2
31
9,000
PFOS
13
11
11
10
11
<2
<2
<2
7.6
2.8
29
Page 3 of 4
October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Location ID
L0055
EQBLK
FBLK
TB
Field Sample ID
ASTW-L0055-101619
ASTW-EB-101619
ASTW-FB-101619
ASTW-TB-101619
Sample Date
10/16/2019
10/16/2019
10/16/2019
10/16/2019
QA/QC
Equipment Blank
Field Blank
Trip Blank
Sample Matrix
LIQUID
LIQUID
LIQUID
LIQUID
Sample Delivery Group (SDG)
320-55408-1
320-55408-1
320-55408-1
320-55408-1
Lab Sample ID
320-55408-5
320-55408-6
320-55408-8
320-55408-7
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
820
4.4
<4
<4
PFMOAA
190 J
<5
<5
<5
PF02HxA
130
<2
<2
<2
PF030A
43
<2
<2
<2
PFO4DA
57 J
<2
<2
<2
PFO5DA
51
<2
<2
<2
PMPA
310
<10
<10
<10
PEPA
99
<20
<20
<20
PS Acid
5.6
<2
<2
<2
Hydro -PS Acid
30
<2
<2
<2
R-PSDA
140 J
<2
<2
<2
Hydrolyzed PSDA
40 J
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
11 J
<2
<2
<2
EVE Acid
6
<2
<2
<2
Hydro -EVE Acid
15
<2
<2
<2
R-EVE
110 J
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ (17 compounds)
1,800
4.4
ND
ND
Total Table 3+ (20 compounds)
2,100
4.4
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
11C1-PF3OUdS
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<48
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
9C1-PF3ONS
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
13
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
6.5
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
2.3
<2
<2
<2
PFOA
16
<2
<2
<2
PFOS
3.3
<2
<2
<2
TABLE B1
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Notes:
Bold - Analyte detected above associated reporting limit
Abbreviations:
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+ analytes were detected above the associated reporting limits
ng/L - nanograms per liter
QA/QC - Quality assurance/ quality control
SDG - Sample Delivery Group
SOP - standard operating procedure
UJ — Analyte not detected. Reporting limit may not be accurate or precise.
< - Analyte not detected above associated reporting limit.
Geosyntec Consultants of NC P.C.
Page 4 of 4 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC42
LOC43
L0058
L0058
L0059
LOC60
LOC61
Field Sample ID
ASTW-LOC-42-030520
ASTW-LOC-43-030520
ASTW-LOC-58-030520
ASTW-LOC-58-030520-Z
ASTW-LOC-59-030520
ASTW-LOC-60-030520
ASTW-LOC-61-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Unfiltered
Unfiltered
Unfiltered
Filtered
Unfiltered
Unfiltered
Unfiltered
Sample Delivery Group (SDG)
2091273
2091273
2091278/2095248//2095247
2091270
2091273
2091273
2091273
Lab Sample ID
1275304/1275304
1275308
1275413/1290740/
1275250
1275312
1275316
1275320
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
3,500
5,100
1,000 J
870
14,000
1,100
1,300
PFMOAA
110,000
77,000
33 J
33
7,600
9.1
480
PFO2HxA
4,500
4,200
130 J
130
1,900
98
580
PFO3OA
3,200
2,900
34 J
32
740
21
91
PFO4DA
3,100
3,200
14 J
12
820
4.8
120
PFO5DA
1,900
2,100
8.3 J
6.1
1,600
2.1
280
PMPA
620
650
50 J
59
2,200
370
1,200
PEPA
230
240
45 J
52
940
390
570
PS Acid
2,100
910
17 J
20
640
18
33
Hydro -PS Acid
500
380
4.3 J
3.5
640
2.8
180
R-PSDA
410
670
790 J
850
3,100
190
190
Hydrolyzed PSDA
1,200
1,300
4.6 B
4.5
950
2.8
23
R-PSDCA
<20
<20
<2 UJ
<2
42
<2
<20
NVHOS
3,500
2,600
2.5 J
<2
410
3.5
24
EVE Acid
150
120
31 J
42
810
42
<20
Hydro -EVE Acid
280
200
6.2 J
7.5
260
3.3
67
R-EVE
260
130
15 J
15
540
15
54
PES
<20
<20
<2 UJ
<2
<20
<2
<20
PFECA B
<20
<20
<2 UJ
<2
<20
<2
<20
PFECA-G
<20
<20
<2 UJ
<2
<20
<2
<20
Total Table 3+ (17 compounds)
130,000
100,000
1,400
1,300
33,000
2,100
4,900
Total Table 3+ (20 compounds)
140,000
100,000
2,200
2,100
37,000
2,300
5,200
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
--
0.62 J
--
--
--
--
PFMOAA
--
--
0.037 J
--
--
--
--
PF02HxA
--
--
0.12 J
--
--
--
--
PF030A
--
--
0.029 J
--
--
--
--
PFO4DA
--
--
0.015 J
--
--
--
--
PFO5DA
--
--
0.034 J
--
--
--
--
PMPA
--
--
0.065 J
--
--
--
--
PEPA
--
--
0.066 J
--
--
--
--
PS Acid
--
--
0.06 J
--
--
--
--
Hydro-PS Acid
--
--
0.093 J
--
--
--
--
R-PSDA
--
--
1.2 J
--
--
--
--
Hydrolyzed PSDA
--
--
0.0097 J
--
--
--
--
R-PSDCA
--
--
<0.004 UJ
--
--
--
--
NVHOS
--
--
<0.004 UJ
--
--
--
--
EVE Acid
--
--
0.062 J
--
--
--
--
Hydro-EVE Acid
--
--
0.035 J
--
--
--
--
R-EVE
--
--
0.02 J
--
--
--
--
PES
--
--
<0.004 UJ
--
--
--
--
PFECA B
--
--
<0.004 UJ
--
--
--
--
PFECA-G
--
--
<0.004 UJ
--
--
--
--
Total Table 3+ (17 compounds)
--
--
1.2
--
--
--
--
Total Table 3+ (20 compounds)
--
--
2.5
--
--
--
--
Other (mg/L)
Total uspen ed Solids
--
--
<1
--
--
--
--
Page 1 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC62
LOC62
LOC63
LOC63
LOC63A
LOC63A
LOC64
Field Sample ID
ASTW-LOC-62-030520
ASTW-LOC-62-030520-Z
ASTW-LOC-63-030520
ASTW-LOC-63-030520-Z
ASTW-LOC-63A-030520
ASTW-LOC-63A-030520-Z
ASTW-LOC-64-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Sample Delivery Group (SDG)
2091278/2095248/2095247
2091270
2091278/2095248/2095247
2091270
2091278/2095248/2095247
2091270
2091278/2095248/2095247
Lab Sample ID
1275419/1290772
1275274
1275420/1290776
1275278
1275417/1290756
1275266
1275418/1290760
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
15,000 J
12,000
2,300 J
1,900
1,800 J
1,600
3,800 J
PFMOAA
12,000 J
9,700
2,300 J
1,500
140 J
150
210 J
PF02HxA
28,000 J
26,000
1,700 J
1,100
380 J
360
2,400 J
PF030A
9,400 J
11,000
640 J
500
98 J
100
350 J
PFO4DA
7,000 J
6,000
630 J
450
84 J
80
89 J
PFO5DA
5,800 J
4,500
320 J
340
68 J
94
42 J
PMPA
15,000 J
13,000
850 J
810
480 J
480
3,600 J
PEPA
9,300 J
7,200
660 J
430
360 J
300
2,000 J
PS Acid
51,000 J
41,000
170 J
220
34 J
43
120 J
Hydro -PS Acid
2,700 J
1,900
140 J
130
64 J
85
140 J
R-PSDA
24,000 J
19,000
4,900 J
4,600
1,000 J
750
2,200 J
Hydrolyzed PSDA
7,100 J
5,000
320 B
590
170 J
82
350 J
R-PSDCA
64 J
62
17 J
15
4.9 J
4.4
8.4 J
NVHOS
1,000 J
620
150 J
150
38 J
39
58 J
EVE Acid
1,500 J
1,200
310 J
430
190 J
200
24 J
Hydro -EVE Acid
380 J
410
80 J
71
41 J
47
37 J
R-EVE
860 J
570
440 J
240
250 J
140
410 J
PES
<2 UJ
<2
<2 UJ
<2
<2 UJ
<2
<2 UJ
PFECA B
<2 UJ
<2
<2 UJ
<2
<2 UJ
<2
<2 UJ
PFECA-G
4.9 J
3.7
<2 UJ
<2
<2 UJ
<2
<2 UJ
Total Table 3+ (17 compounds)
160,000
130,000
10,000
8,000
3,800
3,600
13,000
Total Table 3+ (20 compounds)
190,000
160,000
16,000
13,000
5,200
4,600
16,000
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
0.7 J
--
0.15 J
--
1.9 J
--
0.53 J
PFMOAA
0.23 J
--
0.037 J
--
0.27 J
--
0.34 J
PF02HxA
0.68 J
--
0.038 J
--
0.65 J
--
0.053 J
PF030A
0.45 J
--
0.023 J
--
0.17 J
--
0.64 J
PFO4DA
0.63 J
--
0.11 J
--
0.16 J
--
0.21 J
PFO5DA
3.3 J
--
0.75 J
--
0.41 J
--
0.45 J
PMPA
0.38 J
--
0.07 J
--
0.92 J
--
2.6 UJ
PEPA
0.26 B
--
0.13 UJ
--
0.53 J
--
3 J
PS Acid
9.5 J
--
0.27 J
--
0.13 J
--
0.98 J
Hydro -PS Acid
2.3 J
--
0.33 J
--
0.34 J
--
0.72 J
R-PSDA
1.6 J
--
0.7 J
--
3.5 J
--
0.092 J
Hydrolyzed PSDA
1.6 J
--
0.1 J
--
0.51 J
--
0.49 J
R-PSDCA
0.014 J
--
0.0046 J
--
0.0087 J
--
0.02 J
NVHOS
0.031 J
--
0.0097 J
--
0.067 J
--
0.1 J
EVE Acid
0.72 J
--
0.12 J
--
0.47 J
--
0.08 J
Hydro -EVE Acid
0.82 J
--
0.055 J
--
0.12 J
--
0.17 J
R-EVE
0.079 J
--
0.091 J
--
0.63 J
--
0.47 J
PES
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
PFECA B
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
PFECA-G
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
--
<0.004 UJ
Total Table 3+ (17 compounds)
20
--
2.1
--
6.1
--
9.9
Total Table 3+ (20 compounds)
23
--
3.0
--
11
--
11
Other (mg/L)
Total Suspended Solids
30
--
49
--
1.79 J
--
500
Page 2 of 7
October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC64
LOC65
LOC65
LOC65
LOC65
LOC66
LOC67
Field Sample ID
ASTW-LOC-64-030520-Z
ASTW-LOC-65-030520
ASTW-LOC-65-030520-Z
ASTW-LOC-65-030520-D
ASTW-LOC-65-030520-DZ
ASTW-LOC-66-030520
ASTW-LOC-67-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
DUP
DUP
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Unfiltered
Sample Delivery Group (SDG)
2091270
2091278/2095248/2095247
2091270
2095247/2095248
2091270
2091273
2091273
Lab Sample ID
1275270
1275422/1290786
1275286
1289942/1290795
1277367
1275324
1275328
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
3,300
12,000 J
10,000
9,800 J
10,000
2,100
860
PFMOAA
220
250 J
230
270 J
270
49
21
PF02HxA
2,100
2,100 J
2,300
2,100 J
2,200
440
140
PF030A
360
350 J
340
300 J
390
64
12
PFO4DA
83
190 J
170
150 J
190
19
4
PFO5DA
43
180 J
140 J
140 J
190 J
13
3.4
PMPA
2,800
21,000 J
21,000
24,000 J
22,000
4,400
12,000
PEPA
1,900
17,000 J
16,000
17,000 J
16,000
2,600
7,200
PS Acid
150
300 J
290
260 J
320
1,700
110
Hydro -PS Acid
140
230 J
210
190 J
230
160
47 J
R-PSDA
1,400
6,500 J
5,100
6,600 J
4,700
3,300
260 J
Hydrolyzed PSDA
190
1,000 B
840
1,200 B
870
370
31 J
R-PSDCA
7
93 J
85
92 J
85
2.7
<2
NVHOS
65
360 J
500
370 J
590
110
5.9
EVE Acid
27
45 J
41 J
40 J
38 J
38
4.1
Hydro -EVE Acid
41
72 J
69 J
60 J
64 J
22
3.2
R-EVE
250
450 J
260
370 J
240
830
62
PES
<2
<2 UJ
<2
<2 UJ
<20
<2
<2
PFECA B
<2
<2 UJ
<2
<2 UJ
<20
<2
<2
PFECA-G
<2
<2 UJ
<2
<2 UJ
<20
<2
<2
Total Table 3+ (17 compounds)
11,000
54,000
51,000
55,000
53,000
12,000
20,000
Total Table 3+ (20 compounds)
13,000
62,000
58,000
63,000
58,000
16,000
21,000
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
0.95 J
--
1.4 J
--
--
--
PFMOAA
--
0.011 UJ
--
0.13 J
--
--
--
PF02HxA
--
0.085 J
--
0.23 J
--
--
--
PF030A
--
0.053 J
--
0.17 J
--
--
--
PFO4DA
--
0.12 J
--
0.3 J
--
--
--
PFO5DA
--
0.31 J
--
0.56 J
--
--
--
PMPA
--
0.69 J
--
2.2 J
--
--
--
PEPA
--
0.6 J
--
1.8 J
--
--
--
PS Acid
--
1.4 J
--
2.7 J
--
--
--
Hydro-PS Acid
--
1 J
--
1.6 J
--
--
--
R-PSDA
--
0.67 J
--
1.9 J
--
--
--
Hydrolyzed PSDA
--
0.32 J
--
1.2 J
--
--
--
R-PSDCA
--
0.055 J
--
0.23 J
--
--
--
NVHOS
--
0.038 J
--
0.17 J
--
--
--
EVE Acid
--
0.055 J
--
0.32 J
--
--
--
Hydro-EVE Acid
--
0.11 J
--
0.24 J
--
--
--
R-EVE
--
0.046 J
--
0.49 J
--
--
--
PES
--
<0.004 UJ
--
0.1 J
--
--
--
PFECA B
--
<0.004 UJ
--
0.089 J
--
--
--
PFECA-G
--
<0.004 UJ
--
0.078 J
--
--
--
Total Table 3+ (17 compounds)
--
5.5
--
12
--
--
--
Total Table 3+ (20 compounds)
--
6.5
--
16
--
--
--
Other (mg/L)
Total Suspended Solids
--
270
--
--
--
--
--
Page 3 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC68
LOC69
LOC69
LOC69
LOC69
LOC70
LOC71
Field Sample ID
ASTW-LOC-68-030520-Z
ASTW-LOC-69-030520
ASTW-LOC-69-030520-Z
ASTW-LOC-69-030520-D
ASTW-LOC-69-030520-DZ
ASTW-LOC-70-030520
ASTW-LOC-71-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
DUP
DUP
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Unfiltered
Sample Delivery Group (SDG)
2091273
2091278/2095248
2091270
2095247/2095248
2091270
2091273
2091278/2095248/2095247
Lab Sample ID
1275332
1275421/1289930
1275282
1289938/1290791
1277363
1275336
1275414/1290744
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
210,000
32,000 J
31,000
30,000 J
33,000
86,000
19,000 J
PFMOAA
1,600
9,300 J
7,200
8,900 J
7,200
14,000
100,000 J
PFO2HxA
11,000
11,000 J
9,700
10,000 J
9,900
140,000
23,000 J
PFO3OA
3,000
3,700 J
3,900
3,600 J
4,300
38,000
12,000 J
PFO4DA
570
2,200 J
2,200
2,300 J
2,600
22,000
8,900 J
PFO5DA
390
1,200 J
1,400 J
1,000 J
1,500
18,000
4,100 J
PMPA
3,200
1,800 J
2,000
1,900 J
2,100
12,000
2,600 J
PEPA
<2,000
850 J
750 J
920 J
780 J
6,300
1,500 J
PS Acid
78,000
7,300 J
7,600
7,000 J
7,200
71,000
1,500 J
Hydro -PS Acid
7,500
1,200 J
1,100 J
1,100 J
1,000 J
7,500 J
2,100 J
R-PSDA
140,000
9,000 J
5,900
7,900 J
5,800
190,000 J
1,400 J
Hydrolyzed PSDA
17,000
1,500 B
860
1,500 B
830
16,000 J
2,600 B
R-PSDCA
<200
130 J
130
140 J
120
<200
47 J
NVHOS
3,100
760 J
440
740 J
580
2,100
3,600 J
EVE Acid
11,000
1,300 J
1,100 J
1,200 J
1,100
12,000
330 J
Hydro -EVE Acid
2,400
310 J
310
310 J
310
2,300
360 J
R-EVE
7,000
790 J
490
750 J
500
5,000
320 J
PES
<200
<2 UJ
<2
<2 UJ
<20
<200
<2 UJ
PFECA B
<200
<2 UJ
<2
<2 UJ
<20
<200
<2 UJ
PFECA-G
<200
5.3 J
4.1 J
5.4 J
<20
<200
<2 UJ
Total Table 3+ (17 compounds)
330,000
73,000
69,000
69,000
72,000
430,000
180,000
Total Table 3+ (20 compounds)
500,000
84,000
76,000
79,000
79,000
640,000
180,000
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
--
--
5 J
--
--
0.84 J
PFMOAA
--
--
--
0.62 J
--
--
1.5 J
PFO2HxA
--
--
--
1.7 J
--
--
0.64 J
PFO3OA
--
--
--
0.72 J
--
--
0.71 J
PFO4DA
--
--
--
0.95 J
--
--
3.4 J
PFO5DA
--
--
--
3.2 J
--
--
4 J
PMPA
--
--
--
1.1 J
--
--
0.12 J
PEPA
--
--
--
0.55 J
--
--
0.065 J
PS Acid
--
--
--
5 J
--
--
2.5 J
Hydro -PS Acid
--
--
--
2.5 J
--
--
3.3 J
R-PSDA
--
--
--
3.1 J
--
--
0.2 J
Hydrolyzed PSDA
--
--
--
1.4 J
--
--
0.64 J
R-PSDCA
--
--
--
0.24 J
--
--
0.028 J
NVHOS
--
--
--
0.49 J
--
--
0.19 J
EVE Acid
--
--
--
1 J
--
--
0.4 J
Hydro -EVE Acid
--
--
--
0.66 J
--
--
0.28 J
R-EVE
--
--
--
0.96 J
--
--
0.04 J
PES
--
--
--
0.095 J
--
--
<0.004 UJ
PFECA B
--
--
--
0.07 J
--
--
<0.004 UJ
PFECA-G
--
--
--
0.041 J
--
--
<0.004 UJ
Total Table 3+ (17 compounds)
--
--
--
24
--
--
18
Total Table 3+ (20 compounds)
--
--
--
29
--
--
19
Other (mg/L)
Total Suspended Solids
--
12
--
--
--
--
52
Page 4 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC71
LOC72
LOC72
LOC73
LOC75
LOC76
LOC77
Field Sample ID
ASTW-LOC-71-030520-Z
ASTW-LOC-72-030520
ASTW-LOC-72-030520-Z
ASTW-LOC-73-030520
ASTW-LOC-75-030520
ASTW-LOC-76-030520
ASTW-LOC-77-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Filtered
Unfiltered
Filtered
Unfiltered
Unfiltered
Unfiltered
Unfiltered
Sample Delivery Group (SDG)
2091270
2091278/2095248/2095247
2091270
2091273
2091273
2091273
2091278/2095248/2095247
Lab Sample ID
1275254
1275415/1290748
1275258
1275340
1275344
1275348
1275416/1290752
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
16,000
300 J
290
520
1,500
910
2,900 J
PFMOAA
98,000
12 J
12
22
21
18
250 J
PF02HxA
21,000
58 J
57
100
98
99
610 J
PF030A
14,000
19 J
17
31
33
32
360 J
PFO4DA
9,200
7.2 J
6
13
15
15
370 J
PFO5DA
4,600
3.5 J
2.7
6.2
9.4
8.7
170 J
PMPA
2,400
17 J
11
45
46
26
120 J
PEPA
<2,000
<20 UJ
<20
24
<20
<20
130 J
PS Acid
1,200 J
100 J
130
25
10
20
91 J
Hydro -PS Acid
1,400
11 J
10
17 J
6.7 J
7.6 J
54 J
R-PSDA
680
27 J
21
89 J
25 J
21 J
740 J
Hydrolyzed PSDA
1,200
18 B
15
6.7 J
11 J
17 J
150 J
R-PSDCA
<200
<2 UJ
<2
<2
<2
<2
7.8 J
NVHOS
2,400
3.1 J
<2
3.6
<2
<2
50 J
EVE Acid
300
2.7 J
<2
4.3
3.2
3.6
50 J
Hydro -EVE Acid
300
<2 UJ
<2
<2
<2
<2
20 J
R-EVE
<200
3.6 J
2.5
9.9
6.3
8.2
180 J
PES
<200
<2 UJ
<2
<2
<2
<2
<2 UJ
PFECA B
<200
<2 UJ
<2
<2
<2
<2
<2 UJ
PFECA-G
<200
<2 UJ
<2
<2
<2
<2
<2 UJ
Total Table 3+ (17 compounds)
170,000
530
540
810
1,700
1,100
5,200
Total Table 3+ (20 compounds)
170,000
580
570
920
1,800
1,200
6,300
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
0.032 J
--
--
--
--
1.3 J
PFMOAA
--
<0.01 UJ
--
--
--
--
0.019 J
PF02HxA
--
0.01 J
--
--
--
--
0.19 J
PF030A
--
0.006 J
--
--
--
--
0.13 J
PFO4DA
--
0.0098 J
--
--
--
--
0.52 J
PFO5DA
--
0.084 J
--
--
--
--
0.91 J
PMPA
--
<0.02 UJ
--
--
--
--
0.022 UJ
PEPA
--
<0.04 UJ
--
--
--
--
<0.04 UJ
PS Acid
--
0.64 J
--
--
--
--
0.082 J
Hydro -PS Acid
--
0.099 J
--
--
--
--
0.54 J
R-PSDA
--
<0.004 UJ
--
--
--
--
0.46 J
Hydrolyzed PSDA
--
0.0093 J
--
--
--
--
0.13 J
R-PSDCA
--
<0.004 UJ
--
--
--
--
0.0058 J
NVHOS
--
<0.004 UJ
--
--
--
--
0.065 J
EVE Acid
--
0.0079 J
--
--
--
--
0.45 J
Hydro -EVE Acid
--
<0.004 UJ
--
--
--
--
0.11 J
R-EVE
--
<0.004 UJ
--
--
--
--
0.17 J
PES
--
<0.004 UJ
--
--
--
--
<0.004 UJ
PFECA B
--
<0.004 UJ
--
--
--
--
<0.004 UJ
PFECA-G
--
<0.004 UJ
--
--
--
--
<0.004 UJ
Total Table 3+ (17 compounds)
--
0.89
--
--
--
--
4.3
Total Table 3+ (20 compounds)
--
0.90
--
--
--
--
5.1
Other (mg/L)
Total Suspended Solids
--
1.04 J
--
--
--
--
12
Page 5 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
LOC77
LOC78
LOC79
LOC80
LOC83
LOC84
LOC85
Field Sample ID
ASTW-LOC-77-030520-Z
ASTW-LOC-78-030520
ASTW-LOC-79-030520
ASTW-LOC-80-030520
ASTW-LOC-83-030520
ASTW-LOC-84-030520
ASTW-LOC-85-030520-Z
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Filtered
Unfiltered
Unfiltered
Unfiltered
Unfiltered
Unfiltered
Filtered
Sample Delivery Group (SDG)
2091270
2091277
2091277
2091277
2091277
2091277
2091277
Lab Sample ID
1275262
1275372
1275376
1275380
1275384
1275388
1275392
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
2,600
3,600
9,600
6,200
260
740
730
PFMOAA
260
48
2,100
1,100
<5
40
<5
PF02HxA
590
210
2,600
1,800
4.4
20
8.6
PF030A
370
50
1,600
810
<2
4.1
<2
PFO4DA
280
23
1,400
620
<2
3.4
<2
PFO5DA
160
14
1,400
330
<2
4.6
<2
PMPA
150
370
930
2,500
<10
81
66
PEPA
61
250
440
1,300
<20
<20
<20
PS Acid
95
500
330
1,500
<2
2.6 B
<2
Hydro -PS Acid
56
36 J
410
370
<2
2.2
<2
R-PSDA
540
430 J
3,800
4,600
6.4
34
6.5
Hydrolyzed PSDA
72
33 J
700 B
2,000
<2
5.2 B
<2
R-PSDCA
6.8
<2
45
55
<2
<2
<2
NVHOS
55
17
300
470
<2
2.6
<2
EVE Acid
52
65
200
870
<2
<2
<2
Hydro -EVE Acid
21
15
150
220
<2
<2
<2
R-EVE
92
98
400
2,100
<2
11
<2
PES
<2
<2
<2
<20
<2
<2
<2
PFECA B
<2
<2
<2
<20
<2
<2
<2
PFECA-G
<2
<2
<2
<20
<2
<2
<2
Total Table 3+ (17 compounds)
4,800
5,200
22,000
18,000
260
900
800
Total Table 3+ (20 compounds)
5,500
5,800
26,000
27,000
270
950
810
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
--
--
--
--
--
--
PFMOAA
--
--
--
PF02HxA
--
--
--
PF030A
--
--
--
--
--
--
--
PFO4DA
--
--
--
--
--
--
--
PFO5DA
--
--
--
--
--
--
--
PMPA
--
--
--
--
--
--
--
PEPA
--
--
--
--
--
--
--
PS Acid
--
--
--
--
--
--
--
Hydro-PS Acid
--
--
--
--
--
--
--
R-PSDA
--
--
--
--
--
--
--
Hydrolyzed PSDA
--
--
--
--
--
--
--
R-PSDCA
--
--
--
--
--
--
--
NVHOS
--
--
--
--
--
--
--
EVE Acid
--
--
--
--
--
--
--
Hydro-EVE Acid
--
--
--
--
--
--
--
R-EVE
--
--
--
--
--
--
--
PES
--
--
--
--
--
--
--
PFECA B
--
--
--
--
--
--
--
PFECA-G
--
--
--
--
--
--
--
Total Table 3+ (17 compounds)
--
--
--
--
--
--
--
Total Table 3+ (20 compounds)
--
--
--
--
--
--
--
Other (mg/L)
Total Suspended Solids
--
--
--
--
--
--
--
Page 6 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
TABLE B2
ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Location ID
LOC86
LOC87
LOC88
EB
FBLK
Field Sample ID
ASTW-LOC-86-030520
ASTW-LOC-87-030520
ASTW-LOC-88-030520
ASTW-LOC-EB-030520
ASTW-LOC-FB-030520
Sample Date
3/5/2020
3/5/2020
3/5/2020
3/5/2020
3/5/2020
QA/QC
Equipment Blank
Field Blank
Sample Matrix
Liquid
Liquid
Liquid
Liquid
Liquid
Filtered/Unfiltered
Unfiltered
Unfiltered
Unfiltered
Unfiltered
Unfiltered
Sample Delivery Group (SDG)
2091277
2091277
2091277
2091277/2091279
2091277/2091279
Lab Sample ID
1275396
1275400
1275404
1275408/1275423
1275412/1275424
Total Table 3+ SOP (ng/L)
Hfpo Dimer Acid
280
220
660
<2
<2
PFMOAA
<5
<5
<5
<5
<5
PF02HxA
<2
12
13
<2
<2
PF030A
<2
2.1
2
<2
<2
PFO4DA
<2
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
<2
PMPA
<10
21
25
<10
<10
PEPA
<20
<20
<20
<20
<20
PS Acid
<2
3.3 B
8.9 B
2.2
<2
Hydro -PS Acid
<2
<2
2.1
<2
<2
R-PSDA
<2
23
13
<2
<2
Hydrolyzed PSDA
<2
3 B
<2
6
<2
R-PSDCA
<2
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
<2
R-EVE
<2
10
6.8
<2
<2
PES
<2
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
<2
Total Table 3+ (17 compounds)
280
260
710
2
ND
Total Table 3+ (20 compounds)
280
290
730
8
ND
Total Table 3+ SOP Solid Residue (ng/filter)
Hfpo Dimer Acid
--
--
--
--
--
PFMOAA
--
--
--
--
--
PF02HxA
--
--
--
--
--
PF030A
--
--
--
--
--
PFO4DA
--
--
--
--
--
PFO5DA
--
--
--
--
--
PMPA
--
--
--
--
--
PEPA
--
--
--
--
--
PS Acid
--
--
--
--
--
Hydro-PS Acid
--
--
--
--
--
R-PSDA
--
--
--
--
--
Hydrolyzed PSDA
--
--
--
--
--
R-PSDCA
--
--
--
--
--
NVHOS
--
--
--
--
--
EVE Acid
--
--
--
--
--
Hydro-EVE Acid
--
--
--
--
--
R-EVE
--
--
--
--
--
PES
--
--
--
--
--
PFECA B
--
--
--
--
--
PFECA-G
--
--
--
--
--
Total Table 3+ (17 compounds)
--
--
--
--
--
Total Table 3+ (20 compounds)
--
--
--
--
--
Other (mg/L)
Total Suspended Solids
--
--
--
<1
<1
Geosyntec Consultants of NC P.C.
Notes:
Bold - Analyte detected above associated reporting limit
Abbreviations:
B - analyte detected in an associated blank
EPA - Environmental Protection Agency
J - Analyte detected. Reported value may not be accurate
or precise
mg/ L - milligrams per liter
ND - no Table 3+ analytes were detected above the
associated reporting limits
ng/L - nanograms per liter
QA/QC - Quality assurance/ quality control
SDG - Sample Delivery Group
SOP - standard operating procedure
UJ — Analyte not detected. Reporting limit may not be
accurate or precise.
< - Analyte not detected above associated reporting limit.
Page 7 of 7 October 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
APPENDIX C
Analytical Results — All Sampling Events

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
1
1
1
1
Sampling Event
April 2019
June 2019
August 2019
October 2019
Field Sample ID
DSTW-LOC1-042419
STW-LOC1-062819
STW-LOC1-082219
STW-LOC1-101019
Date Sampled
4/24/2019
06/28/2019
8/22/2019
10/10/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
14
18
30
12
PFMOAA
7 J
<5
25
<5 UJ
PFO2HxA
12 J
14
21
7.5
PFO3OA
<2 UJ
2.5
3.3
<2
PFO4DA
<2 UJ
<2
<2
<2
PFO5DA
<2 UJ
<2
<2
<2
PMPA
21 J
23
37
27
PEPA
<20 UJ
<20
<20
<20
PS Acid
<2 UJ
<2
<2
<2
Hydro -PS Acid
<2 UJ
<2
<2
<2
R-PSDA
11J
2.8J
15J
8.5J
Hydrolyzed PSDA
3.2 J
<2
11 J
2.3 J
R-PSDCA
<2 UJ
<2
<2
<2
NVHOS
<2 UJ
<2
5.1
5.8
EVE Acid
<2 UJ
<2
<2
<2
Hydro -EVE Acid
<2 UJ
<2
<2
<2
R-EVE
6.4 J
<2
4 J
<2
PES
<2 UJ
<2
<2
<2
PFECA B
<2 UJ
<2
<2
<2
PFECA-G
<2 UJ
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
54
58
120
52
Total Table 3+ Compounds (20 compounds)*
75
60
150
63
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<2
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<37
2.7
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2.3
3.7
4
6.5
Perfluorobutanoic Acid
7.1
8.3
8.5
19
Perfluorodecane Sulfonic Acid
<2.0
<2
<2
<2
Perfluorodecanoic Acid
<2.0
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2.0
<2
<2
<2
Perfluorododecanoic Acid
<2.0
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2.0
<2
<2
<2
Perfluoroheptanoic Acid
7.0
14
20
32
Perfluorohexadecanoic acid (PFHxDA)
<2.0
<2
<2
<2
Perfluorohexane Sulfonic Acid
3.3
5
5.6
8.7
Perfluorohexanoic Acid
9.2
21
26
51
Perfluorononanesulfonic acid
<2.0
<2
<2
<2
Perfluorononanoic Acid
<2.0
<2
<2
<2
Perfluorooctadecanoic acid
<2.0
<2
<2
<2
Perfluorooctane Sulfonamide
<2.0
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.0
<2
<2
<2
Perfluoropentanoic Acid
7
17
26
48
Perfluorotetradecanoic Acid
<2.0
<2
<2
<2
Perfluorotridecanoic Acid
<2.0
<2
<2
<2
Perfluoroundecanoic Acid
<2.0
<2
<2
<2
PFOA
8.1
8.5
8.7
10
PFOS
12
11
12
14
TR0795A Page 1 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
1
1
1
1
Sampling Event
December 2019
January 2020
April 2020
May/June 2020
Field Sample ID
STW-LOC-1-122019
STW-LOC-1-122019
STW-LOC-1-4-042820
STW-LOC-1-2-052120
Date Sampled
12/20/2019
1/29/2020
4/28/2020
5/20/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
9.8 B
13
13
24
PFMOAA
14
12
7.6
<5
PFO2HxA
6.9
6.1
11
12
PFO3OA
<2
<2
2
2.3
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
4.6
3.1
PMPA
23 B
17
26
56
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
5 J
5.5 J
11 J
31 J
Hydrolyzed PSDA
7.1 J
6.1 J
5.2 J
4.8 J
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
5.5
4.6
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
2.3 J
<2
6.6 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
54
48
70
100
Total Table 3+ Compounds (20 compounds)*
66
62
86
140
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
--
DONA
--
--
--
<2
NaDONA
<2.1
<2.1
<2.1
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.1
2.2
3.4
3.6 J
Perfluorobutanoic Acid
3.6
<2
5.1
5.6
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
8.8
4.8
4.2
5.1 J
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
3
2.4
4.1
4.8 J
Perfluorohexanoic Acid
15
6.3
8.5
11
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
9.7
5.4
11
9.8
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
5.4
3.8
5.5
5.5 J
PFOS
6.8
5.4
8.3
9.0
TR0795A Page 2 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
1
2
3
4
Sampling Event
August 2020
May/June 2020
May/June 2020
May/June 2020
Field Sample ID
STW-LOC-1-4-082620
STW-LOC-2-.33-052120
STW-LOC-3-2-052120
STW-LOC-4-2-052120
Date Sampled
8/26/2020
5/20/2020
5/20/2020
5/20/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
13
2,700
2,700
620
PFMOAA
5.0
<11
<11
12
PFO2HxA
14
41
25
6.9
PFO3OA
2.5
10
11
3.3
PFO4DA
<2
4
8
2
PFO5DA
<2
<2
11
4.9
PMPA
60
220
<28
65
PEPA
<10
32
<20
<20
PS Acid
<2
11
<2
<2
Hydro -PS Acid
<2
5
4
2
R-PSDA
<2
26 J
17 J
17 J
Hydrolyzed PSDA
3.0
19 J
5.2 J
2.2 J
R-PSDCA
<2
<2
<2
<2
NVHOS
6.5
4.7
3.1
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
2
<2
<2
R-EVE
<2
15 J
5.4 J
3.8 J
PES
<2
<2.3
<2.3
<2
PFECA B
<2
<3
<3
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
100
3,000
2,800
720
Total Table 3+ Compounds (20 compounds)*
100
3,100
2,800
740
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<3
<3.2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<5
<5.4
<2.5
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<31
<34
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<82
<87
<41
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<13
<14
<6.7
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<22
<23
<11
6:2 Fluorotelomer sulfonate
<20
<31
<34
<20
F-53B Major (9C1-PF3ONS)
<2
<3.8
<4
<2
ADONA
--
--
--
--
DONA
<2
<2.8
<3
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<30
<32
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<14
<15
<6.9
N-methyl perfluoro-l-octanesulfonamide
<2
<6.8
<7.2
<3.4
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<49
<52
<24
Perfluorobutane Sulfonic Acid
4.1
<3.1
<3.4
<2
Perfluorobutanoic Acid
4.3
<5.5
<5.9
<2.8
Perfluorodecane Sulfonic Acid
<2
<5
<5.4
<2.5
Perfluorodecanoic Acid
<2
<4.9
<5.2
<2.4
Perfluorododecane sulfonic acid (PFDoS)
<2
<7.1
<7.5
<3.6
Perfluorododecanoic Acid
<2
<8.6
<9.2
<4.3
Perfluoroheptane sulfonic acid (PFHpS)
<2
<3
<3.2
<2
Perfluoroheptanoic Acid
3.0
<3.9
<4.2
<2
Perfluorohexadecanoic acid (PFHxDA)
--
<14
<15
<7
Perfluorohexane Sulfonic Acid
3.6
<2.7
3
<2
Perfluorohexanoic Acid
7.1
<9.1
<9.7
<4.6
Perfluorononanesulfonic acid
<2
<2.5
<2.7
<2
Perfluorononanoic Acid
<2
<4.2
<4.5
<2.1
Perfluorooctadecanoic acid
<2
<7.2
<7.7
<3.6
Perfluorooctane Sulfonamide
<2
<5.5
<5.9
<2.8
Perfluoropentane sulfonic acid (PFPeS)
<2
<4.7
<5
<2.4
Perfluoropentanoic Acid
7.1
<7.7
<8.2
<3.9
Perfluorotetradecanoic Acid
<2
<4.6
<4.9
<2.3
Perfluorotridecanoic Acid
<2
<20
<22
<10
Perfluoroundecanoic Acid
<2
<17
<18
<8.7
PFOA
5.1
18
26
9
PFOS
7.4
<8.5
15
<4.3
TR0795A Page 3 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
5
6A
6A
6A
Sampling Event
May/June 2020
April 2019
June 2019
August 2019
Field Sample ID
STW-LOC-5-1.99-052120
DSTW-LOC6A-042419
STW-LOC-6A-062719
STW-LOC6A-082119
Date Sampled
5/20/2020
04/24/2019
06/27/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
100
13
66
19
PFMOAA
<5
<5 UJ
<5 UJ
<5
PFO2HxA
19
11 J
11 J
12
PFO3OA
4.5
<2 UJ
<2 UJ
<2
PFO4DA
3
<2 UJ
<2 UJ
<2
PFO5DA
9.2
<2 UJ
<2 UJ
<2
PMPA
68
24 J
23 J
27
PEPA
<20
<20 UJ
<20 UJ
<20
PS Acid
13
<2 UJ
<2 UJ
<2
Hydro -PS Acid
51
<2 UJ
<2 UJ
<2
R-PSDA
120 J
8.1 J
7.9 J
<2
Hydrolyzed PSDA
5.2 J
4.3 J
<2 UJ
5.1 J
R-PSDCA
5
<2 UJ
<2 UJ
<2
NVHOS
9.9
<2 UJ
<2 UJ
5.3
EVE Acid
<2
<2 UJ
<2 UJ
<2
Hydro -EVE Acid
<2
<2 UJ
<2 UJ
<2
R-EVE
11J
2.6J
4J
3.9J
PES
<2
<2 UJ
<2 UJ
<2
PFECA B
<2
<2 UJ
<2 UJ
<2
PFECA-G
<2
<2 UJ
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
280
48
100
63
Total Table 3+ Compounds (20 compounds)*
420
63
110
72
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2.0
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
--
--
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<60
<60
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<110
<110
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
--
--
<2
ADONA
--
<2.1
<2.1
<2.1
DONA
<2
--
--
--
NaDONA
--
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<37 UJ
<37
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<35 UJ
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2
2.4
3.6
4.3
Perfluorobutanoic Acid
3.4
7.6
11
8.7
Perfluorodecane Sulfonic Acid
<2
<2.0
<2
<2
Perfluorodecanoic Acid
<2
<2.0
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2.0
<2
<2
Perfluorododecanoic Acid
<2
<2.0
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2.0
<2
<2
Perfluoroheptanoic Acid
<2
7.4
13
21
Perfluorohexadecanoic acid (PFHxDA)
<2
<2.0
<2
<2
Perfluorohexane Sulfonic Acid
<2
3.7
5.3
6.5
Perfluorohexanoic Acid
<2
9.2
22
27
Perfluorononanesulfonic acid
<2
<2.0
<2
<2
Perfluorononanoic Acid
<2
<2.0
<2
<2
Perfluorooctadecanoic acid
<2
<2.0
<2
<2
Perfluorooctane Sulfonamide
<2
<2.0
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2.0
<2
<2
Perfluoropentanoic Acid
12
7.4
18
27
Perfluorotetradecanoic Acid
<2
<2.0
<2
<2
Perfluorotridecanoic Acid
<2
<2.0
<2
<2
Perfluoroundecanoic Acid
<2
<2.0
<2
<2
PFOA
<2
8.6
8.3
11
PFOS
2.1
14
14
18
TR0795A Page 4 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
6A
6A
6A
6A
Sampling Event
October 2019
December 2019
January 2020
April 2020
Field Sample ID
STW-LOC6A-100919
STW-LOC-6A-122019
STW-LOC6A-012920
STW-LOC-6A-042820
Date Sampled
10/9/2019
12/20/2019
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
17
30 B
36
17
PFMOAA
<5 UJ
13
13 J
9.9
PFO2HxA
12
7.7
16
11
PFO3OA
2
<2
<2
2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
5.9
PMPA
37
53 B
62
30
PEPA
<20
22
24
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
15J
6.5J
21J
14J
Hydrolyzed PSDA
2.9 J
6.4 J
7.3 J
4.7 J
R-PSDCA
<2
<2
<2
<2
NVHOS
6.6
<2
<2
5.4
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
6J
4.2 J
7.8 J
5J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
75
130
150
81
Total Table 3+ Compounds (20 compounds)*
99
140
190
100
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
5.9
3.1
2.5
3.6
Perfluorobutanoic Acid
18
<2
4
5.8
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
36
11
5.3
4.7
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
8.9
3.6
2.9
4.8
Perfluorohexanoic Acid
48
16
7
9.2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
45
11
5.6
11
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
12
6.1
5.3
6.9
PFOS
18
9.4
8.6
14
TR0795A Page 5 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
6A
6A
6B
6B
Sampling Event
May/June 2020
August 2020
April 2019
June 2019
Field Sample ID
STW-LOC6A-060320
STW-LOC-6A-082620
DSTW-LOC6B-042419
STW-LOC-6B-062719
Date Sampled
6/3/2020
8/26/2020
04/24/2019
06/27/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
6.7 J
21
41
24
PFMOAA
<2 UJ
24
<5 UJ
<5 UJ
PFO2HxA
7.1 J
23
11 J
13 J
PFO3OA
<2 UJ
3.4
<2 UJ
<2 UJ
PFO4DA
<2 UJ
<2
<2 UJ
<2 UJ
PFO5DA
<2 UJ
<2
<2 UJ
<2 UJ
PMPA
14 J
80
23 J
23 J
PEPA
2 J
<10
<20 UJ
<20 UJ
PS Acid
<2 UJ
<2
<2 UJ
<2 UJ
Hydro -PS Acid
<2 UJ
<2
<2 UJ
<2 UJ
R-PSDA
7.6 J
<2
11 J
13 J
Hydrolyzed PSDA
2.4 J
10
3.6 J
<2 UJ
R-PSDCA
<2 UJ
<2
<2 UJ
<2 UJ
NVHOS
<2 UJ
<2
<2 UJ
<2 UJ
EVE Acid
<2 UJ
<2
<2 UJ
<2 UJ
Hydro -EVE Acid
<2 UJ
<2
<2 UJ
<2 UJ
R-EVE
3.6 J
<2
6.6 J
5.8 J
PES
<2 UJ
<2
<2 UJ
<2 UJ
PFECA B
<2 UJ
<2
<2 UJ
<2 UJ
PFECA-G
<2 UJ
<2
<2 UJ
<2 UJ
Total Table 3+ Compounds (17 compounds)*
30
150
75
60
Total Table 3+ Compounds (20 compounds)*
43
160
96
79
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<60
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<110
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
--
--
ADONA
--
--
<2.1
<2.1
DONA
<2
<2
--
--
NaDONA
--
--
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2
<37 UJ
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<35 UJ
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3
4.2
2.3
3.6
Perfluorobutanoic Acid
3
5.5
7.1
9.2
Perfluorodecane Sulfonic Acid
<2
<2
<2.0
<2
Perfluorodecanoic Acid
<2
<2
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2.0
<2
Perfluorododecanoic Acid
<2
<2
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2.0
<2
Perfluoroheptanoic Acid
5
3.3
7.4
13
Perfluorohexadecanoic acid (PFHxDA)
<2
--
<2.0
<2
Perfluorohexane Sulfonic Acid
3.5
4.1
3.6
5.6
Perfluorohexanoic Acid
9.7
7.5
9.3
20
Perfluorononanesulfonic acid
<2
<2
<2.0
<2
Perfluorononanoic Acid
<2
<2
<2.0
<2
Perfluorooctadecanoic acid
<2
<2
<2.0
<2
Perfluorooctane Sulfonamide
<2
<2
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2.0
<2
Perfluoropentanoic Acid
6.4
7.9
7.2
17
Perfluorotetradecanoic Acid
<2
<2
<2.0
<2
Perfluorotridecanoic Acid
<2
<2
<2.0
<2
Perfluoroundecanoic Acid
<2
<2
<2.0
<2
PFOA
7.6
6
9.3
9.6
PFOS
16
11
14
16
TR0795A Page 6 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
6B
6B
6B
6B
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC6B-082119
STW-LOC6B-100919
STW-LOC-6B-122019
STW-LOC6B-012920
Date Sampled
8/21/2019
10/9/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
17
17
9 B
25
PFMOAA
<5
<5 UJ
13
8.9 J
PFO2HxA
11
11
6.4
6.1
PFO3OA
<2
2.1
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
37
30
19 B
26
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
12 J
11 J
<2
3.4 J
Hydrolyzed PSDA
2.5 J
2.8 J
6.4 J
5.1 J
R-PSDCA
<2
<2
<2
<2
NVHOS
4.4
6.5
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
3.2 J
4.7 J
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
69
67
47
66
Total Table 3+ Compounds (20 compounds)*
87
85
54
75
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.3
6.9
3.3
2.4
Perfluorobutanoic Acid
8.4
18
<2
3.4
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
20
35
8.2
4.7
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2 UJ
<2
Perfluorohexane Sulfonic Acid
5.8
8.5
3.4
2.6
Perfluorohexanoic Acid
27
48
16
6.3
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2 UJ
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
26
46
10
5.5
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
8.8
11
4.9
4.2
PFOS
15
16
7.2
5.9
TR0795A Page 7 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
6B
6B
6B
7A
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-6B-042820
STW-LOC6B-060320
STW-LOC-6B-082620
DSTW-LOC7A-042419
Date Sampled
4/28/2020
6/3/2020
8/26/2020
04/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
12
4.5 J
27
14
PFMOAA
9.8
<2 UJ
31
8 J
PFO2HxA
9.5
6.4 J
32
12 J
PFO3OA
<2
<2 UJ
4.7
<2 UJ
PFO4DA
<2
<2 UJ
<2
<2 UJ
PFO5DA
4.5
<2 UJ
<2
<2 UJ
PMPA
31
17 J
53
24 J
PEPA
<20
<2 UJ
<10
<20 UJ
PS Acid
<2
<2 UJ
<2
<2 UJ
Hydro -PS Acid
<2
<2 UJ
<2
<2 UJ
R-PSDA
10 J
<2 UJ
<2
5.3 J
Hydrolyzed PSDA
4 J
2 J
<2
4.2 J
R-PSDCA
<2
<2 UJ
<2
<2 UJ
NVHOS
5.1
<2 UJ
<2
<2 UJ
EVE Acid
<2
<2 UJ
<2
<2 UJ
Hydro -EVE Acid
<2
<2 UJ
<2
<2 UJ
R-EVE
<2
<2 UJ
<2
3.9 J
PES
<2
<2 UJ
<2
<2 UJ
PFECA B
<2
<2 UJ
<2
<2 UJ
PFECA-G
<2
<2 UJ
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
72
28
150
58
Total Table 3+ Compounds (20 compounds)*
86
30
150
71
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.6
3.1
4.6
2.3
Perfluorobutanoic Acid
5.6
8.6
5.9
7
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2.0
Perfluorodecanoic Acid
<2
<2
<2
<2.0
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2.0
Perfluorododecanoic Acid
<2
<2
<2
<2.0
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2.0
Perfluoroheptanoic Acid
4.5
4.4
3.4
7.4
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
--
<2.0
Perfluorohexane Sulfonic Acid
4.4
3
3.8
3.4
Perfluorohexanoic Acid
9.2
8.8
7.5
8.3
Perfluorononanesulfonic acid
<2
<2
<2
<2.0
Perfluorononanoic Acid
<2
<2
<2
<2.0
Perfluorooctadecanoic acid
<2
<2
<2
2
Perfluorooctane Sulfonamide
<2
<2
<2
<2.0
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2.0
Perfluoropentanoic Acid
11
7.5
8.1
6.5
Perfluorotetradecanoic Acid
<2
<2
<2
<2.0
Perfluorotridecanoic Acid
<2
<2
<2
<2.0
Perfluoroundecanoic Acid
<2
<2
<2
<2.0
PFOA
6
6.6
5.6
8.8
PFOS
9.8
9.3
9.7
14
TR0795A Page 8 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7A
7A
7A
7A
Sampling Event
June 2019
August 2019
October 2019
December 2019
Field Sample ID
STW-LOC7A-062819
STW-LOC7A-082219
STW-LOC7A-101019
STW-LOC-7A-122019
Date Sampled
06/28/2019
8/22/2019
10/10/2019
12/20/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
22
13
16
9.3 B
PFMOAA
<5
6.7
<5 UJ
13
PFO2HxA
14
9.4
10
6.7
PFO3OA
2.2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
22
23
28
21 B
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
3.4 J
11 J
11 J
<2
Hydrolyzed PSDA
<2
3.1 J
3.2 J
8.2 J
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
4.5
6.6
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
4.8 J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
60
57
61
50
Total Table 3+ Compounds (20 compounds)*
64
71
80
58
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<2
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.6
4.1
4.9
3
Perfluorobutanoic Acid
8.8
8.8
18
4
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
14
20
33
8.6
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
5.2
6.1
8.8
3.3
Perfluorohexanoic Acid
20
26
49
16
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
19
26
46
11
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
9.4
8.9
11
5.5
PFOS
15
15
15
8.1
TR0795A Page 9 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7A
7A
7A
7A
Sampling Event
January 2020
April 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC7A-012920
STW-LOC-7A-4-042820
STW-LOC-7A-2-052120
STW-LOC-7A-4-082620
Date Sampled
1/29/2020
4/28/2020
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
7.8
13
200
14
PFMOAA
12
14
<5
5.2
PFO2HxA
6
10
21
13
PFO3OA
<2
2.3
10
2.0
PFO4DA
<2
<2
12
<2
PFO5DA
<2
4.3
17
<2
PMPA
15
25
69
57
PEPA
<20
<20
<20
<10
PS Acid
<2
<2
90
<2
Hydro -PS Acid
<2
<2
380
<2
R-PSDA
4.7 J
9.2 J
120 J
<2
Hydrolyzed PSDA
6 J
5.5 J
98 J
3.2
R-PSDCA
<2
<2
2.2
<2
NVHOS
<2
5.1
7.6
6.5
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
19 J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
41
74
810
98
Total Table 3+ Compounds (20 compounds)*
52
88
1,000
100
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
--
--
DONA
--
--
<2
<2
NaDONA
<2.1
<2.1
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2
3.6
4.3
4.0
Perfluorobutanoic Acid
2.1
5.2
7
4.4
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.9
4.6
5.8
3.2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
2.5
4.6
4.3
4.1
Perfluorohexanoic Acid
5
9
9.2
6.8
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
5
10
14
6.7
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
3.9
6.4
36
5.8
PFOS
6.8
11
10
10
TR0795A Page 10 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7B
7B
7B
7B
Sampling Event
April 2019
June 2019
June 2019
August 2019
Field Sample ID
DSTW-LOC7B-042419
STW-LOC7B-062719
STW-LOC7B-062719-D
STW-LOC7B-082219
Date Sampled
04/24/2019
06/27/2019
06/27/2019
8/22/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
21
18
18
42
PFMOAA
51 J
69
65
1,100
PFO2HxA
26 J
25
25
300
PFO3OA
6 J
10
10
100
PFO4DA
2.5 J
9.7
10
64
PFO5DA
<2 UJ
24
26
35
PMPA
23 J
21
19
45
PEPA
<20 UJ
<20
<20
<20
PS Acid
<2 UJ
<2
2.0
6.9
Hydro -PS Acid
7 J
120
130
180
R-PSDA
19 J
73 J
71 J
110 J
Hydrolyzed PSDA
53 J
490 J
470 J
1,100 J
R-PSDCA
<2 UJ
2.2
2.3
4.1
NVHOS
2.1 J
9.2
9.8
48
EVE Acid
<2 UJ
<2
<2
<2
Hydro -EVE Acid
<2 UJ
<2
<2
8.7
R-EVE
4 J
3.7 J
<2
11 J
PES
<2 UJ
<2
<2
<2
PFECA B
<2 UJ
<2
<2
<2
PFECA-G
<2 UJ
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
140
310
320
1,900
Total Table 3+ Compounds (20 compounds)*
210
870
860
3,200
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
900 J
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<2
<2
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<37 UJ
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2.3
3.4
3.7
4
Perfluorobutanoic Acid
5.2
8.9
8.7
10
Perfluorodecane Sulfonic Acid
<2.0
<2
<2
<2
Perfluorodecanoic Acid
<2.0
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2.0
<2
<2
<2
Perfluorododecanoic Acid
<2.0
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2.0
<2
<2
<2
Perfluoroheptanoic Acid
7
14
15
20
Perfluorohexadecanoic acid (PFHxDA)
<2.0
<2
<2
<2
Perfluorohexane Sulfonic Acid
3.5
5.4
5.5
5.7
Perfluorohexanoic Acid
8.2
21
21
26
Perfluorononanesulfonic acid
<2.0
<2
<2
<2
Perfluorononanoic Acid
<2.0
<2
<2
<2
Perfluorooctadecanoic acid
<2.0
<2
<2
<2
Perfluorooctane Sulfonamide
<2.0
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.0
<2
<2
<2
Perfluoropentanoic Acid
7.2
18
17
27
Perfluorotetradecanoic Acid
<2.0
<2
<2
<2
Perfluorotridecanoic Acid
<2.0
<2
<2
<2
Perfluoroundecanoic Acid
<2.0
<2
<2
<2
PFOA
7.9
8.9
9.3
9.6
PFOS
14
15
16
14
TR0795A Page 11 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7B
7B
7B
7B
Sampling Event
October 2019
December 2019
January 2020
April 2020
Field Sample ID
STW-LOC7B-101019
STW-LOC-7B-122019
STW-LOC7B-012920
STW-LOC-7B-4-042820
Date Sampled
10/10/2019
12/20/2019
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
23
29 B
19
16
PFMOAA
24 J
25
17
9.8
PFO2HxA
17
9.2
9.4
10
PFO3OA
5.7
2.1
2
<2
PFO4DA
4.3
<2
<2
<2
PFO5DA
9.8
<2
<2
6.3
PMPA
35
29 B
24
22
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
71
3.1
<2
2.4
R-PSDA
22 J
6.8 J
8.9 J
16 J
Hydrolyzed PSDA
140 J
71 J
39 J
29 J
R-PSDCA
<2
<2
<2
<2
NVHOS
13
2.1
<2
5.7
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
5.5 J
<2
3.6 J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
200
100
71
72
Total Table 3+ Compounds (20 compounds)*
370
180
120
120
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
6.6
3
2.2
3.4
Perfluorobutanoic Acid
19
4.2
2
5.1
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
33
8.6
3.9
4.5
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
8.7
3.3
2.8
4.4
Perfluorohexanoic Acid
49
16
6.3
8.9
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
46
11
5.1
10
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
11
7.1
4.6
6.3
PFOS
14
7.6
6
10
TR0795A Page 12 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
7B
7B
7C
7C
Sampling Event
May/June 2020
August 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC-7B-2-052120
STW-LOC-7B-4-082620
STW-LOC-7C-2-052120
STW-LOC-7C-4-082620
Date Sampled
5/20/2020
8/26/2020
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
200
20
460
24
PFMOAA
180
41
380
36
PFO2HxA
77
27
160
23
PFO3OA
23
6.3
59
5.4
PFO4DA
13
4.8
38
<2
PFO5DA
19
5.2
41
<2
PMPA
66
56
100
63
PEPA
<20
<10
55
<10
PS Acid
85
<2
250
26
Hydro -PS Acid
350
7.1
390
6.6
R-PSDA
120 J
<2
380 J
<2
Hydrolyzed PSDA
170 J
70
230 J
110
R-PSDCA
2.1
<2
7.8
<2
NVHOS
12
8.5
30
8.0
EVE Acid
<2
<2
23
14
Hydro -EVE Acid
<2
<2
7.2
10
R-EVE
17 J
10
37 J
11
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
1,000
180
2,000
220
Total Table 3+ Compounds (20 compounds)*
1,300
260
2,600
340
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4
3.9
3.9
3.6
Perfluorobutanoic Acid
5.1
3.8
10
3.9
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
6.5
3.5
7.6
3.3
Perfluorohexadecanoic acid (PFHxDA)
<2
--
<2
--
Perfluorohexane Sulfonic Acid
4.6
4.2
4.4
4.00
Perfluorohexanoic Acid
11
6.8
11
6.9
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
15
7.4
31
7.8
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
31
6.1
36
5.9
PFOS
11
9.9
9.8
9.8
TR0795A Page 13 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
8
8
8
8
Sampling Event
April 2019
June 2019
August 2019
October 2019
Field Sample ID
DSTW-LOC8-042419
STW-LOC8-062819
STW-LOC8-082219
STW-LOC8-101019
Date Sampled
04/24/2019
06/28/2019
8/22/2019
10/10/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
120
100
460
120
PFMOAA
1,200 J
<21
20,000
240 J
PFO2HxA
480
360
4,900
95 J
PFO3OA
150
200
1,700
48
PFO4DA
<79
210
1,000
48
PFO5DA
51
520
480
85 J
PMPA
<570
<57
160
38
PEPA
<47
34
72
28
PS Acid
<27
37
58
9.9
Hydro -PS Acid
240
2,600
1,700
550
R-PSDA
<160
760 J
340 J
37 J
Hydrolyzed PSDA
690 J
3,500 J
4,600 J
600 J
R-PSDCA
<15
49
43
12
NVHOS
<54
190
530
54
EVE Acid
<24
<2.4
<4.9
<2
Hydro -EVE Acid
<28
18
140
9.2
R-EVE
<70
29 J
39 J
7 J
PES
<46
<4.6
<9.2
<2
PFECA B
<60
<6
<12
<2
PFECA-G
<41
<4.1
<8.2
<2
Total Table 3+ Compounds (17 compounds)*
2,200
4,300
31,000
1,300
Total Table 3+ Compounds (20 compounds)*
2,900
8,600
36,000
2,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<6
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<11
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<37
<3.7
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<3.5
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2.4
4.3
4.5
5.2
Perfluorobutanoic Acid
5.7
18
24
26
Perfluorodecane Sulfonic Acid
<2.0
<2
<2
<2
Perfluorodecanoic Acid
<2.0
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2.0
<2
<2
<2
Perfluorododecanoic Acid
<2.0
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2.0
<2
<2
<2
Perfluoroheptanoic Acid
3.7
16
22
26
Perfluorohexadecanoic acid (PFHxDA)
<2.0
<2
<2
<2
Perfluorohexane Sulfonic Acid
3.1
4.7
4.6
4.5
Perfluorohexanoic Acid
4.9
25
31
40
Perfluorononanesulfonic acid
<2.0
<2
<2
<2
Perfluorononanoic Acid
<2.0
4.8
3.2
<2
Perfluorooctadecanoic acid
<2.0
<2
<2
<2
Perfluorooctane Sulfonamide
<2.0
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.0
<2
<2
<2
Perfluoropentanoic Acid
4.2
22
39
43
Perfluorotetradecanoic Acid
<2.0
<2
<2
<2
Perfluorotridecanoic Acid
<2.0
<2
<2
<2
Perfluoroundecanoic Acid
<2.0
<2
<2
<2
PFOA
8.2
12
16
9.1
PFOS
<2.0
2.9
2.7
2.2
TR0795A Page 14 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
8
8
8
8
Sampling Event
December 2019
January 2020
April 2020
May 2020
Field Sample ID
STW-LOC-8-122319
STW-LOC8-013120
STW-LOC-8-4-042820
STW-LOC-8-2-052120
Date Sampled
12/23/2019
1/31/2020
4/28/2020
5/20/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
500
210
200
350
PFMOAA
220
280
88
9,400
PFO2HxA
73
100
54
2,700
PFO3OA
16
<58
14
720
PFO4DA
13 J
<79
17
120
PFO5DA
14
76
36
78
PMPA
130
1,000
60
140
PEPA
91
<47
<20
57
PS Acid
12
29
8.1
24
Hydro -PS Acid
61
200 J
69
210
R-PSDA
26 J
<160
21 J
84 J
Hydrolyzed PSDA
620 J
280 J
340 J
560 J
R-PSDCA
<2
<15
<2
5
NVHOS
16
<54
12
170
EVE Acid
<2
<24
<2
<2
Hydro -EVE Acid
2.8
<28
3.1
19
R-EVE
7.8 J
<70
3.5 J
<3.5
PES
<2
<46
<2
<2.3
PFECA B
<2
<60
<2
<3
PFECA-G
<2
<41
<2
<2
Total Table 3+ Compounds (17 compounds)*
1,100
1,900
560
14,000
Total Table 3+ Compounds (20 compounds)*
1,800
2,200
930
15,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
--
DONA
--
--
--
<2
NaDONA
<2.1
<2.1
<2.1
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.1
2.7
5
5.2
Perfluorobutanoic Acid
12
3.5
8.8
8.8
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
11
6.7
7.3
9.7
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
2.4
3.8
Perfluorohexanoic Acid
17
11
14
14
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2 UJ
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
21
13
16
23
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
28
16
9.6
13
PFOS
<2
<2
<2
<2
TR0795A Page 15 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
8
8
9
9
Sampling Event
June 2020
August 2020
April 2019
June 2019
Field Sample ID
STW-LOC8-4-060520
STW-LOC-8-4-082620
DSTW-LOC9-042419
STW-LOC9-062819
Date Sampled
6/3/2020
8/26/2020
04/24/2019
06/28/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
240 J
96
29
77
PFMOAA
260 J
470
8.8 J
<21
PFO2HxA
98 J
200
17 J
20
PFO3OA
34 J
50
4.5 J
5.9
PFO4DA
19 J
17
3.6 J
<7.9
PFO5DA
26 J
17
<2 UJ
<3.4
PMPA
71 J
52
25 J
<57
PEPA
39 J
15
<20 UJ
<20
PS Acid
13 J
<2
28 J
2,300
Hydro -PS Acid
140 J
77
3.4 J
120
R-PSDA
120 J
18
50 J
110 J
Hydrolyzed PSDA
640 J
200
83 J
190 J
R-PSDCA
4.1 J
2.1
<2 UJ
<2
NVHOS
25 J
30
2.8 J
61
EVE Acid
<2 UJ
5.8
11 J
57
Hydro -EVE Acid
4.2 J
6.1
<2 UJ
6.7
R-EVE
3.2 J
17
7.5 J
53 J
PES
<2 UJ
<2
<2 UJ
<4.6
PFECA B
<2 UJ
<2
2.8 J
<6
PFECA-G
<2 UJ
<2
<2 UJ
<4.1
Total Table 3+ Compounds (17 compounds)*
970
1,000
140
2,600
Total Table 3+ Compounds (20 compounds)*
1,700
1,300
280
3,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<60
<6
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<110
<11
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
--
--
ADONA
--
--
<2.1
<2.1
DONA
<2
<2
--
--
NaDONA
--
--
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<37
<3.7
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<35
<3.5
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
5
4.2
2.2
3.7
Perfluorobutanoic Acid
5.9
5.8
6.9
9.2
Perfluorodecane Sulfonic Acid
<2
<2
<2.0
<2
Perfluorodecanoic Acid
<2
<2
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2.0
<2
Perfluorododecanoic Acid
<2
<2
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2.0
<2
Perfluoroheptanoic Acid
5.4
4.6
7.5
13
Perfluorohexadecanoic acid (PFHxDA)
<2
--
<2.0
<2
Perfluorohexane Sulfonic Acid
4.1
2.7
3.3
5.5
Perfluorohexanoic Acid
7.6
8.4
9
21
Perfluorononanesulfonic acid
<2
<2
<2.0
<2
Perfluorononanoic Acid
<2
<2
<2.0
2
Perfluorooctadecanoic acid
<2
<2
<2.0
<2
Perfluorooctane Sulfonamide
<2
<2
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2.0
<2
Perfluoropentanoic Acid
12
17
8.6
19
Perfluorotetradecanoic Acid
<2
<2
<2.0
<2
Perfluorotridecanoic Acid
<2
<2
<2.0
<2
Perfluoroundecanoic Acid
<2
<2
<2.0
<2
PFOA
12
9.4
8.9
9.3
PFOS
2
<2
14
15
TR0795A Page 16 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
9
9
9
9
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC9-082219
STW-LOC9-101019
STW-LOC-9-122019
STW-LOC9-012920
Date Sampled
8/22/2019
10/10/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
55
2,400
28 B
59
PFMOAA
25 J
38 J
14
14
PFO2HxA
28
500
14
14
PFO3OA
5.9
160
5
4.1
PFO4DA
2.3
45
3.8 J
3.6
PFO5DA
<2
26
3.2
4.1
PMPA
48
110
27 B
18
PEPA
<20
27
<20
<20
PS Acid
86
170
6.6
160 J
Hydro -PS Acid
8
50
<2
8.7
R-PSDA
81 J
300 J
8.3 J
80 J
Hydrolyzed PSDA
160 J
1,500 J
49 J
150 J
R-PSDCA
<2
7.6
<2
<2
NVHOS
11
63
<2
3.1
EVE Acid
19
110
3.7
10
Hydro -EVE Acid
2.1
34
<2
2.6
R-EVE
17J
91J
3.5J
10J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
290
3,700
110
300
Total Table 3+ Compounds (20 compounds)*
550
5,600
170
540
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
41
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.1
6.3
3.1
2.1
Perfluorobutanoic Acid
9.1
54
4.5
3.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
19
38
9.7
4.8
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
6.1
9.2
3.3
2.8
Perfluorohexanoic Acid
26
55
16
6
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
3
<2 UJ
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
27
94
12
9.8
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2 UJ
2.2
Perfluoroundecanoic Acid
<2
<2
<2 UJ
<2
PFOA
8.9
12
6.7
4.3
PFOS
15
16
7.8
6.2
TR0795A Page 17 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
9
9
9
10
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-9-4-042820
STW-LOC-9-2-052120
STW-LOC-9-4-082620
DSTW-LOC10-042419
Date Sampled
4/28/2020
5/20/2020
8/26/2020
4/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
25
3,200
51
320
PFMOAA
11
390
5.7
58 J
PFO2HxA
13
1,700
15
88 J
PFO3OA
2.9
760
3.8
24 J
PFO4DA
<2
430
<2
20 J
PFO5DA
4
590
<2
9.1 J
PMPA
25
1,000
40
260 J
PEPA
<20
630
<10
97 J
PS Acid
49
2,000
100
78 J
Hydro -PS Acid
2.3
400
8.9
19 J
R-PSDA
21 J
2,600 J
58
190 J
Hydrolyzed PSDA
85 J
970 J
320
280 J
R-PSDCA
<2
65
<2
<2 UJ
NVHOS
10
200
3.2
14 J
EVE Acid
3.3
330
71
8.5 J
Hydro -EVE Acid
<2
81
55
8.5 J
R-EVE
<2
240 J
19
150 J
PES
<2
<2.3
<2
<2 UJ
PFECA B
<2
<3
<2
<2 UJ
PFECA-G
<2
<2
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
150
12,000
350
1,000
Total Table 3+ Compounds (20 compounds)*
250
16,000
750
1,600
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.8
3.1
4.3
2.1
Perfluorobutanoic Acid
6
57
6.2
10
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2.0
Perfluorodecanoic Acid
<2
2
<2
<2.0
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2.0
Perfluorododecanoic Acid
<2
<2
<2
<2.0
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2.0
Perfluoroheptanoic Acid
4.6
36
4.2
8.4
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
--
<2.0
Perfluorohexane Sulfonic Acid
4.7
3.9
4.5
3.5
Perfluorohexanoic Acid
9.8
15
7.0
9.3
Perfluorononanesulfonic acid
<2
<2
<2
<2.0
Perfluorononanoic Acid
<2
8.8
<2
<2.0
Perfluorooctadecanoic acid
<2
<2
<2
<2.0
Perfluorooctane Sulfonamide
<2
<2
<2
<2.0
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2.0
Perfluoropentanoic Acid
12
220
13
17
Perfluorotetradecanoic Acid
<2
<2
<2
<2.0
Perfluorotridecanoic Acid
<2
<2
<2
<2.0
Perfluoroundecanoic Acid
<2
3.2
<2
<2.0
PFOA
6.4
55
6.2
10
PFOS
12
10
12
12
TR0795A Page 18 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
10
10
10
10
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC10-082219
STW-LOC10-101019
STW-LOC-10-122019
STW-LOC10-012920
Date Sampled
8/22/2019
10/10/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
1,700
15,000
230
8,300
PFMOAA
490 J
1,700
34
22,000
PFO2HxA
250
7,400
32
23,000
PFO3OA
88
3,300
12
870
PFO4DA
87
2,100
11 J
750
PFO5DA
42
1,900
9.2
340
PMPA
180
1,300
58
810
PEPA
63
590
23
420
PS Acid
380
23,000
40
650
Hydro -PS Acid
510
3,000
8.8
300
R-PSDA
870 J
1,200 J
35 J
280 J
Hydrolyzed PSDA
730 J
3,400 J
100 J
380 J
R-PSDCA
23
78
<2
11
NVHOS
460
270
7
180
EVE Acid
62
680
8.5
110
Hydro -EVE Acid
72
930
4
140
R-EVE
280 J
570 J
38 J
170 J
PES
<2
<9.2
<2
<9.2
PFECA B
<2
<12
<2
<12
PFECA-G
<2
<8.2
<2
<8.2
Total Table 3+ Compounds (17 compounds)*
4,400
61,000
480
58,000
Total Table 3+ Compounds (20 compounds)*
6,300
66,000
650
59,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
2.1
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.4
<2
3.1
<2
Perfluorobutanoic Acid
23
170
5.4
56
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
14
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
2.4
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
23
33
8.8
17
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
6
<2
3.3
<2
Perfluorohexanoic Acid
29
41
15
19
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
2.5
22
<2
3.9
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
47
200
12
85
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
14
<2
<2
PFOA
48
26
6.6
17
PFOS
15
9
8.3
3.9
TR0795A Page 19 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
10
10A
10A
11
Sampling Event
May/June 2020
May/June 2020
August 2020
May/June 2020
Field Sample ID
STW-LOC-10-2-052120
STW-LOC-10A-2-052120
STW-LOC-10A-4-082620
STW-LOC-11-1-052120
Date Sampled
5/20/2020
5/20/2020
8/26/2020
5/20/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
1,700
2,600
56
320
PFMOAA
5,300
13,000
<4
46
PFO2HxA
630
1,100
15
580
PFO3OA
440
580
2.4
16
PFO4DA
340
450
<3
24
PFO5DA
560
510
<3.9
47
PMPA
<280
<570
<31
120
PEPA
120
300
<10
47
PS Acid
230
1,100
160
11
Hydro -PS Acid
150
410
12
20
R-PSDA
480 J
1,800 J
34
230 J
Hydrolyzed PSDA
170 J
700 J
340
38 J
R-PSDCA
11
44
<2
<2
NVHOS
210
540
2.6
7.3
EVE Acid
25
140
72
<2
Hydro -EVE Acid
44
89
49
8.7
R-EVE
160 J
330 J
9.9
83 J
PES
<23
<46
<2
<2
PFECA B
<30
<60
<2
<2
PFECA-G
<20
<41
<2.4
<2
Total Table 3+ Compounds (17 compounds)*
9,800
21,000
370
1,200
Total Table 3+ Compounds (20 compounds)*
11,000
24,000
750
1,600
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
--
--
--
--
DONA
<2
<2
<2
<2
NaDONA
--
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
4.3
<2
Perfluorobutanoic Acid
62
78
6.4
11
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
2.8
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
7.1
18
3.8
6.5
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
--
<2
Perfluorohexane Sulfonic Acid
<2
<2
4.2
5.6
Perfluorohexanoic Acid
11
17
7.4
4.8
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
2.8
5.4
<2
4.8
Perfluorooctadecanoic acid
<2
<2
<2 UJ
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
37
120
12
17
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
2.2
<2
<2
PFOA
5.1
14
6.3
12
PFOS
<2
3.5
12
63
TR0795A Page 20 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
12
12
12
12
Sampling Event
August 2019
December 2019
May/June 2020
August 2020
Field Sample ID
STW-LOC12-082219
STW-LOC-12-122019
STW-LOC-12-2-052120
STW-LOC-12-4-082620
Date Sampled
8/22/2019
12/20/2019
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
17
15 B
77
21
PFMOAA
<5
20
<5
12 J
PFO2HxA
14
14
44
21
PFO3OA
2.6
2.4
4.6
3.6
PFO4DA
<2
<2
2.6
<2
PFO5DA
<2
3
5.7
<2
PMPA
26
50 B
83
52
PEPA
<20
<20
<20
<10
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
9
<2
R-PSDA
9.2 J
<2
53 J
23 J
Hydrolyzed PSDA
3 J
15 J
6.9 J
4.1 J
R-PSDCA
<2
<2
<2
<2
NVHOS
4.9
2.4
4.2
11 J
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
3.5 J
<2
6.3 J
7.4 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
65
110
230
120
Total Table 3+ Compounds (20 compounds)*
80
120
300
160
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
--
--
DONA
--
--
<2
<2
NaDONA
<2.1
<2.1
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
6.5
4.5
4.3
6.9
Perfluorobutanoic Acid
15
6.8
6.3
8.3
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
33
11
7.8
6.3
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
8.5
5.5
5.9
6.5
Perfluorohexanoic Acid
37
19
13
12
Perfluorononanesulfonic acid
<2
<2
<2
<2 UJ
Perfluorononanoic Acid
2.9
<2
<2
2.1
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
37
14
15
14
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2 UJ
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
16
6.9
9.6
11
PFOS
22
15
13
19
TR0795A Page 21 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
12
13
14
14
Sampling Event
August 2020
May/June 2020
April 2019
June 2019
Field Sample ID
STW-LOC-12-4-082620
STW-LOC-10A-2-052120
DSTW-LOC14-042419
STW-LOC14-062819
Date Sampled
8/26/2020
5/20/2020
04/24/2019
06/28/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Field Duplicate
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
20
640
12
22
PFMOAA
12
50
67 J
<5
PFO2HxA
22
53
10 J
15
PFO3OA
3.9
22
2.1 J
2.5
PFO4DA
<2
24
<2 UJ
<2
PFO5DA
<2
23
<2 UJ
<2
PMPA
52
190
15 J
22
PEPA
<10
84
<20 UJ
<20
PS Acid
<2
170
<2 UJ
<2
Hydro -PS Acid
<2
33
<2 UJ
<2
R-PSDA
<2 UJ
120 J
5.7 J
<2
Hydrolyzed PSDA
4.0
190 J
2.3 J
2.1 J
R-PSDCA
<2
<2
<2 UJ
<2
NVHOS
<2 UJ
9.5
<2 UJ
<2
EVE Acid
<2
7
<2 UJ
<2
Hydro -EVE Acid
<2
7
<2 UJ
<2
R-EVE
<2 UJ
57 J
3.2 J
<2
PES
<2
<2
<2 UJ
<2
PFECA B
<2
<2
<2 UJ
<2
PFECA-G
<2
<2
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
120
1,300
110
62
Total Table 3+ Compounds (20 compounds)*
160
1,700
120
64
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<60
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<110
<2
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
--
--
ADONA
--
--
<2.1
<2.1
DONA
<2
<2
--
--
NaDONA
--
--
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<37
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
6.5
<2
<2.0
5.7
Perfluorobutanoic Acid
8.1
13
4.7
13
Perfluorodecane Sulfonic Acid
<2
<2
<2.0
<2
Perfluorodecanoic Acid
<2
<2
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2.0
<2
Perfluorododecanoic Acid
<2
<2
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2.0
<2
Perfluoroheptanoic Acid
6.1
7.6
3.1
24
Perfluorohexadecanoic acid (PFHxDA)
--
<2
<2.0
<2
Perfluorohexane Sulfonic Acid
6.2
<2
3
7.9
Perfluorohexanoic Acid
12
3.7
4.4
36
Perfluorononanesulfonic acid
<2
<2
<2.0
<2
Perfluorononanoic Acid
2.0
3
<2.0
2.3
Perfluorooctadecanoic acid
<2
<2
<2.0
<2
Perfluorooctane Sulfonamide
<2
<2
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2.0
<2
Perfluoropentanoic Acid
14
45
3.8
28
Perfluorotetradecanoic Acid
<2
<2
<2.0
<2
Perfluorotridecanoic Acid
<2
<2
<2.0
<2
Perfluoroundecanoic Acid
<2
<2
<2.0
<2
PFOA
10
9.9
5.8
14
PFOS
18
2.2
11
22
TR0795A Page 22 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
14
14
14
14
Sampling Event
August 2019
October 2019
December 2019
April 2020
Field Sample ID
STW-LOC14-082219
STW-LOC14-101019
STW-LOC-14-122019
STW-LOC-14-4-042820
Date Sampled
8/22/2019
10/10/2019
12/20/2019
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
14
15
21 B
39
PFMOAA
<5
<5 UJ
19
25
PFO2HxA
14
6.7
13
21
PFO3OA
<2
<2
<2
4.4
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2 UJ
<2
5.4
PMPA
33
23
68
34
PEPA
<20
<20
25
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
2.1
R-PSDA
5J
2.4 J
<2
8.6 J
Hydrolyzed PSDA
<2
<2
9.3 J
17 J
R-PSDCA
<2
<2
<2
<2
NVHOS
3.8
6
<2
4.7
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
65
51
150
140
Total Table 3+ Compounds (20 compounds)*
70
53
160
160
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
39 J
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.2
9.6
4.5
3.5
Perfluorobutanoic Acid
10
27
6.8
5.3
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
21
50
11
4.7
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
6.1
13
5.1
4.7
Perfluorohexanoic Acid
27
72
20
8.7
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
2.2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
2.1
<2
<2
Perfluoropentanoic Acid
27
67
14
9.9
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
10
15
7.5
6.4
PFOS
15
20
11
12
TR0795A Page 23 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
14
14
15
15
Sampling Event
May/June 2020
August 2020
April 2019
June 2019
Field Sample ID
STW-LOC-14-1.33-
052120
STW-LOC-14-4-082620
DSTW-LOC15-042419
STW-LOC15-062819
Date Sampled
5/20/2020
8/26/2020
04/24/2019
06/28/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
120
19
34
45
PFMOAA
<5
8.7
8.4 J
12
PFO2HxA
15
17
17 J
16
PFO3OA
3.9
2.5
4 J
3.2
PFO4DA
<2
<2
3.2 J
<2
PFO5DA
<2
<2
<2 UJ
<2
PMPA
57
51
35 J
25
PEPA
<20
<10
<20 UJ
<20
PS Acid
3.1
<2
22 J
880
Hydro -PS Acid
3.3
<2
4.3 J
41
R-PSDA
21 J
<2
42 J
80 J
Hydrolyzed PSDA
6.8 J
3.2
71 J
250 J
R-PSDCA
<2
<2
<2 UJ
<2
NVHOS
3.8
8.9
3 J
23
EVE Acid
<2
<2
9.5 J
22
Hydro -EVE Acid
<2
<2
<2 UJ
3.6
R-EVE
9.9 J
<2
10 J
33 J
PES
<2
<2
<2 UJ
<2
PFECA B
<2
<2
<2 UJ
<2
PFECA-G
<2
<2
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
210
#REF!
140
1,100
Total Table 3+ Compounds (20 compounds)*
240
#REF!
260
1,400
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<60
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<110
<2
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
--
--
ADONA
--
--
<2.1
<2.1
DONA
<2
<2
--
--
NaDONA
--
--
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<37
3.1
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.1
6.1
2.3
3.7
Perfluorobutanoic Acid
5.9
7.8
6.5
9.4
Perfluorodecane Sulfonic Acid
<2
<2
<2.0
<2
Perfluorodecanoic Acid
<2
<2
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2.0
<2
Perfluorododecanoic Acid
<2
<2
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2.0
<2
Perfluoroheptanoic Acid
5.5
5.8
7.5
14
Perfluorohexadecanoic acid (PFHxDA)
<2
--
<2.0
<2
Perfluorohexane Sulfonic Acid
4.1
6.2
3.5
5.7
Perfluorohexanoic Acid
9.5
11
7.9
22
Perfluorononanesulfonic acid
<2
<2
<2.0
<2
Perfluorononanoic Acid
<2
<2
<2.0
<2
Perfluorooctadecanoic acid
<2
<2
<2.0
<2
Perfluorooctane Sulfonamide
<2
<2
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2.0
<2
Perfluoropentanoic Acid
12
12
8.2
18
Perfluorotetradecanoic Acid
<2
<2
<2.0
<2
Perfluorotridecanoic Acid
<2
<2
<2.0
<2
Perfluoroundecanoic Acid
<2
<2
<2.0
<2
PFOA
15
10
8.5
9.5
PFOS
9.3
17
14
15
TR0795A Page 24 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
15
15
15
15
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC15-082219
STW-LOC15-101019
STW-LOC-15-122019
STW-LOC15-012920
Date Sampled
8/22/2019
10/10/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
43
140
35
85
PFMOAA
12
<5 UJ
15
120
PFO2HxA
22
32
13
140
PFO3OA
5.3
16
5
8.2
PFO4DA
2.2
16
3.9
6.5
PFO5DA
<2
15
3.1
5.3
PMPA
38
45
31 B
23
PEPA
<20
<20
<20
<20
PS Acid
92
150
24
100
Hydro -PS Acid
8.2
28
2.2
8.5
R-PSDA
63 J
250 J
11 J
120 J
Hydrolyzed PSDA
140 J
1,700 J
58 J
360 J
R-PSDCA
<2
3.6
<2
<2
NVHOS
12
35
2
5.4
EVE Acid
22
62
4.3
7.9
Hydro -EVE Acid
2.1
21
<2
2.7
R-EVE
15 J
71 J
4.7 J
22 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
260
560
140
510
Total Table 3+ Compounds (20 compounds)*
480
2,600
210
1,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.1
6.5
3
2.2
Perfluorobutanoic Acid
9.2
22
<2
2.4
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
20
37
8.7
4.7
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
5.9
8.9
3.4
2.6
Perfluorohexanoic Acid
26
51
14
5.5
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
2.4
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
28
68
10
10
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
9.4
11
4.8
4
PFOS
16
16
8.2
6.2
TR0795A Page 25 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
15
15
15
15
Sampling Event
April 2020
May/June 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC-15-4-042820
STW-LOC-15-2-052120
STW-LOC--D15-2-052120-
STW-LOC-15-4-082620
Date Sampled
4/28/2020
5/20/2020
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
36
3,000
3,000
51
PFMOAA
14
2,700
2,700
<2
PFO2HxA
14
1,100
1,100
7.3
PFO3OA
3.8
420
470
<2
PFO4DA
2.6
300
230
<2
PFO5DA
6.1
300
310
<2
PMPA
27
680
680
<20
PEPA
<20
460
460
<10
PS Acid
140
2,200
2,400
51
Hydro -PS Acid
7
400
420
3.8
R-PSDA
47 J
2,800 J
2,900 J
15
Hydrolyzed PSDA
330 J
1,100 J
1,200 J
150
R-PSDCA
<2
77
81
<2
NVHOS
11
250
250
<2
EVE Acid
4.1
410
410
27
Hydro -EVE Acid
<2
77
75
18
R-EVE
6.3 J
260 J
270 J
3.4
PES
<2
<4.6
<4.6
<2
PFECA B
<2
<6
<6
<2
PFECA-G
<2
<4.1
<4.1
<2
Total Table 3+ Compounds (17 compounds)*
270
12,000
13,000
160
Total Table 3+ Compounds (20 compounds)*
650
17,000
17,000
330
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
--
--
--
DONA
--
<2
<2
<2
NaDONA
<2.1
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.7
2.5
2.8
4.2
Perfluorobutanoic Acid
7.9
53
57
6.8
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
2
2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
5
32
36
4.1
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
4.6
3.1
3.3
4.3
Perfluorohexanoic Acid
9.3
14
15
7.6
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
6
6.4
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
12
240
260
13
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
2.1
2.7
<2
PFOA
6.1
26
28
6.4
PFOS
11
8
8.9
12
TR0795A Page 26 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
18
18
18
18
Sampling Event
June 2019
August 2019
August 2019
August 2019
Field Sample ID
STW-LOC-18-062719
STW-LOC18-082119-1
STW-LOC18-082119-2
STW-LOC18-082119-3
Date Sampled
06/27/2019
8/21/2019
8/21/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
4.1
7.1
11
7.6
PFMOAA
<5 UJ
<5
<5
<5
PFO2HxA
2.4 J
2.2
4.4
3.8
PFO3OA
<2 UJ
<2
<2
<2
PFO4DA
<2 UJ
<2
<2
<2
PFO5DA
<2 UJ
<2
<2
<2
PMPA
<10 UJ
<10 UJ
18
21
PEPA
<20 UJ
<20
<20
<20
PS Acid
<2 UJ
<2
2
<2
Hydro -PS Acid
<2 UJ
<2
<2
<2
R-PSDA
<2 UJ
3.5 J
4.1 J
2.3 J
Hydrolyzed PSDA
<2 UJ
<2
<2
<2
R-PSDCA
<2 UJ
<2
<2
<2
NVHOS
<2 UJ
<2 UJ
<2
4.4
EVE Acid
<2 UJ
<2
<2
<2
Hydro -EVE Acid
<2 UJ
<2
<2
<2
R-EVE
<2 UJ
<2
2.1 J
3.2 J
PES
<2 UJ
<2
<2
<2
PFECA B
<2 UJ
<2
<2
<2
PFECA-G
<2 UJ
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
6.5
9.3
35
37
Total Table 3+ Compounds (20 compounds)*
6.5
13
42
42
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<4 UJ
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<37
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<3.3
14 J
7.1 J
7.9
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
2.4
5.1
9.2
8.9
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2 UJ
<2 UJ
<2 UJ
Perfluorohexane Sulfonic Acid
<2
<2
2.6
2.5
Perfluorohexanoic Acid
3.5
5.2
11
12
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2 UJ
<2 UJ
<2 UJ
<2 UJ
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
3.6
3.7 J
11
11
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
2.8
5.4
5.1
PFOS
<2
<2
6.4
7.6
TR0795A Page 27 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
18
18
18
18
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC18-082119-4
STW-LOC18-100919
STW-LOC-18-122019
STW-LOC18-012920
Date Sampled
8/21/2019
10/9/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
120
16
12 B
6 J
PFMOAA
<5
<5 UJ
<5
<5
PFO2HxA
20
5.5 J
3.9 J
3.7 J
PFO3OA
5.1
<2
<2
<2
PFO4DA
3.2
<2
<2
<2
PFO5DA
<2
<2 UJ
<2
<2 UJ
PMPA
64 J
<10 UJ
19 B
<10 UJ
PEPA
26
<20
<20
<20 UJ
PS Acid
5
<2
<2
<2
Hydro -PS Acid
6.4
<2
<2
<2
R-PSDA
53 J
13 J
7.7 J
<2
Hydrolyzed PSDA
22 J
<2
6.2 J
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
6.4
<2 UJ
<2 UJ
<2 UJ
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
2.3
<2
<2
<2
R-EVE
26 J
2.4 J
5.2 J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
260
22
35
9.7
Total Table 3+ Compounds (20 compounds)*
360
37
54
9.7
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<49
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4 UJ
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1 UJ
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1 UJ
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2 UJ
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
12 J
17 J
<3.3
110 J
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
6.3
22
2.8
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2 UJ
<8.3
<89 UJ
Perfluorohexane Sulfonic Acid
<2
5.4
<2
<2
Perfluorohexanoic Acid
7.6
29
3.2
<2 UJ
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2 UJ
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
7.3
27 J
3.4
<49 UJ
Perfluorotetradecanoic Acid
<2
<2 UJ
<2
<2 UJ
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
4.2
6.7
3.3
<2
PFOS
4.1
10
2.8
<2
TR0795A Page 28 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
18
18
18
19A
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-18-4-042820
STW-LOC18-4-060520
STW-LOC-18-4-082620
DSTW-LOC19A-042419
Date Sampled
4/28/2020
6/3/2020
8/26/2020
04/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
6.5
3.6 J
9.5
30 J
PFMOAA
<5
<2 UJ
<2
< 5 UJ
PFO2HxA
3.5
2.8 J
2.8
4.8 J
PFO3OA
<2
<2 UJ
<2
<2 UJ
PFO4DA
<2
<2 UJ
<2
<2 UJ
PFO5DA
4.6
<2 UJ
<2
<2 UJ
PMPA
15
<13 UJ
<20
27 J
PEPA
<20
<2 UJ
<10
<20 UJ
PS Acid
<2
<2 UJ
<2
<2 UJ
Hydro -PS Acid
<2
<2 UJ
<2
<2 UJ
R-PSDA
<2
<2 UJ
10
<2 UJ
Hydrolyzed PSDA
3.1 J
<2 UJ
<2
<2 UJ
R-PSDCA
<2
<2 UJ
<2
<2 UJ
NVHOS
<2
<2 UJ
<2
<2 UJ
EVE Acid
<2
<2 UJ
<2
<2 UJ
Hydro -EVE Acid
<2
<2 UJ
<2
<2 UJ
R-EVE
<2
<2 UJ
<2
<2 UJ
PES
<2
<2 UJ
<2
<2 UJ
PFECA B
<2
<2 UJ
<2
<2 UJ
PFECA-G
<2
<2 UJ
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
30
6.4
12
62
Total Table 3+ Compounds (20 compounds)*
33
6.4
22
62
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20 UJ
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1 UJ
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1 UJ
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2 UJ
<7.5
<2
<37 UJ
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35 UJ
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2.0 UJ
Perfluorobutanoic Acid
<2
<3
4.8 J
4.3 J
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2.0 UJ
Perfluorodecanoic Acid
<2
<2
<2
<2.0 UJ
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2.0 UJ
Perfluorododecanoic Acid
<2
<2
<2
<2.0 UJ
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2.0 UJ
Perfluoroheptanoic Acid
<2
<2
2.4
<2.0 UJ
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2 UJ
--
<2.0 UJ
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2.0 UJ
Perfluorohexanoic Acid
2.1
2.4
2.3
<2.0 UJ
Perfluorononanesulfonic acid
<2
<2
<2
<2.0 UJ
Perfluorononanoic Acid
<2
<2
<2
<2.0 UJ
Perfluorooctadecanoic acid
<2 UJ
<2 UJ
<2 UJ
<2.0 UJ
Perfluorooctane Sulfonamide
<2
<2
<2
<2.0 UJ
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2.0 UJ
Perfluoropentanoic Acid
2.6
2.9
3.3
2.6 J
Perfluorotetradecanoic Acid
<2
<2 UJ
<2
<2.0 UJ
Perfluorotridecanoic Acid
<2
<2
<2
<2.0 UJ
Perfluoroundecanoic Acid
<2
<2
<2
<2.0 UJ
PFOA
<2
2
2.5
2.6 J
PFOS
4.3
3.3
4.4
<2.0 UJ
TR0795A Page 29 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
19A
19A
19A
19A
Sampling Event
June 2019
August 2019
October 2019
December 2019
Field Sample ID
STW-LOC-19A-062719
STW-LOC19A-082119
STW-LOC19A-100919
STW-LOC-19A-122019
Date Sampled
06/27/2019
8/21/2019
10/9/2019
12/20/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
4.5 J
18
7.3
380
PFMOAA
<5 UJ
<5
<5
16
PFO2HxA
2.6 J
5.1
7.1
35
PFO3OA
<2 UJ
<2
<2 UJ
9.7
PFO4DA
<2 UJ
<2
<2 UJ
4 J
PFO5DA
<2 UJ
<2
<2 UJ
<2
PMPA
<10 UJ
21
19
340
PEPA
<20 UJ
<20
<20
180
PS Acid
<2 UJ
4.5
<2
<2
Hydro -PS Acid
<2 UJ
<2
<2
<2
R-PSDA
<2 UJ
<2 UJ
<2 UJ
<2
Hydrolyzed PSDA
<2 UJ
<2
<2 UJ
11 J
R-PSDCA
<2 UJ
<2
<2
<2
NVHOS
<2 UJ
<2
2.1
2.2
EVE Acid
<2 UJ
<2
<2
<2
Hydro -EVE Acid
<2 UJ
<2
<2
2.4
R-EVE
<2 UJ
<2
<2 UJ
4.1 J
PES
<2 UJ
<2
<2
<2
PFECA B
<2 UJ
<2
<2
<2
PFECA-G
<2 UJ
<2 UJ
<2 UJ
<2 UJ
Total Table 3+ Compounds (17 compounds)*
7.1
49
36
970
Total Table 3+ Compounds (20 compounds)*
7.1
49
36
980
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20 UJ
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1 UJ
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1 UJ
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<37
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
2.4 J
2.9
6
3.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
3.3 J
5.1
9.5
3.5
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2 UJ
<2 UJ
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
6.1 J
6.8
15
7.8
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
3.1 B
Perfluorooctadecanoic acid
<2 UJ
<2 UJ
<2 UJ
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
5.3
7.1
15
6.3
Perfluorotetradecanoic Acid
<2 UJ
<2
<2 UJ
<2
Perfluorotridecanoic Acid
<2
<2
<2
46 B
Perfluoroundecanoic Acid
<2
<2
<2
15 B
PFOA
3.1 J
3.7
3.3
14
PFOS
<2
2.4
2.5
<2
TR0795A Page 30 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
19A
19A
19A
19A
Sampling Event
January 2020
April 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC19A-012920
STW-LOC-19A-042820
STW-LOC19A-060320
STW-LOC-19A-082620
Date Sampled
1/29/2020
4/28/2020
6/3/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
19 J
5
51 J
4.2
PFMOAA
8.7 J
<5
<2 UJ
5.5
PFO2HxA
9.3
4
10 J
4.9
PFO3OA
2.9
<2
3.4 J
<2
PFO4DA
<2
<2
2.5 J
<2
PFO5DA
<2
5.4
<2 UJ
<2
PMPA
27
13
34 J
<20
PEPA
<20
<20
9.6 J
<10
PS Acid
2.3
3
<2 UJ
3.1
Hydro -PS Acid
<2
<2
<2 UJ
<2
R-PSDA
<2
<2
22 J
<2
Hydrolyzed PSDA
4.8 J
<2
17 J
<2
R-PSDCA
<2
<2
<2 UJ
<2
NVHOS
<2
<2
<2 UJ
<2
EVE Acid
<2
<2
<2 UJ
<2
Hydro -EVE Acid
<2
<2
2 J
<2
R-EVE
<2
<2
11 J
<2
PES
<2
<2
<2 UJ
<2
PFECA B
<2
<2
<2 UJ
<2
PFECA-G
<2
<2
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
69
30
110
18
Total Table 3+ Compounds (20 compounds)*
74
30
160
18
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2 UJ
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2 UJ
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20 UJ
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20 UJ
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2 UJ
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4 UJ
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20 UJ
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2 UJ
<2
<2
<2
ADONA
<2.1 UJ
<2.1
--
--
DONA
--
--
<2
<2
NaDONA
<2.1 UJ
<2.1
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20 UJ
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2 UJ
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2 UJ
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20 UJ
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2 UJ
<2
2.4
<2
Perfluorobutanoic Acid
8.6 J
<2
5.2
<2
Perfluorodecane Sulfonic Acid
<2 UJ
<2
<2
<2
Perfluorodecanoic Acid
<2 UJ
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2 UJ
<2
<2
<2
Perfluorododecanoic Acid
<2 UJ
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2 UJ
<2
<2
<2
Perfluoroheptanoic Acid
2.9 J
<2
3.4
<2
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2 UJ
<2
--
Perfluorohexane Sulfonic Acid
<2 UJ
<2
<2
<2
Perfluorohexanoic Acid
4.3 J
2.7
5.5
2.5
Perfluorononanesulfonic acid
<2 UJ
<2
<2
<2
Perfluorononanoic Acid
<2 UJ
<2
<2
<2
Perfluorooctadecanoic acid
<2 UJ
<2 UJ
<2
<2 UJ
Perfluorooctane Sulfonamide
<2 UJ
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2 UJ
<2
<2
<2
Perfluoropentanoic Acid
3.2 J
3.2
5.5
2.9
Perfluorotetradecanoic Acid
<2 UJ
<2
<2
<2
Perfluorotridecanoic Acid
<2 UJ
<2
<2
<2
Perfluoroundecanoic Acid
<2 UJ
<2
<2
<2
PFOA
4.4 J
<2
12
2.7
PFOS
7 J
<2
2.4
<2
TR0795A Page 31 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
19B
19B
19B
19B
Sampling Event
April 2019
June 2019
August 2019
October 2019
Field Sample ID
DSTW-LOC19B-042419
STW-LOC-19B-062719
STW-LOC19B-082119
STW-LOC19B-100919
Date Sampled
04/24/2019
06/27/2019
8/21/2019
10/9/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
22
9.6
26
5.9
PFMOAA
<5 UJ
<5 UJ
<5
<5
PFO2HxA
9.8 J
3.1 J
5.3
3.9
PFO3OA
<2 UJ
<2 UJ
<2
<2
PFO4DA
<2 UJ
<2 UJ
<2
<2 UJ
PFO5DA
<2 UJ
<2 UJ
<2
<2 UJ
PMPA
39 J
<10 UJ
26
12
PEPA
<20 UJ
<20 UJ
<20
<20
PS Acid
<2 UJ
<2 UJ
5
<2
Hydro -PS Acid
<2 UJ
21 J
2.6
2.2
R-PSDA
6.5 J
<2 UJ
<2
<2 UJ
Hydrolyzed PSDA
3.5 J
<2 UJ
<2
<2
R-PSDCA
<2 UJ
<2 UJ
<2
<2
NVHOS
<2 UJ
<2 UJ
3
3.2
EVE Acid
<2 UJ
<2 UJ
<2
<2
Hydro -EVE Acid
<2 UJ
<2 UJ
<2
<2
R-EVE
5.3 J
<2 UJ
<2
<2
PES
<2 UJ
<2 UJ
<2
<2
PFECA B
<2 UJ
<2 UJ
<2
<2
PFECA-G
<2 UJ
<2 UJ
<2 UJ
<2 UJ
Total Table 3+ Compounds (17 compounds)*
71
34
68
27
Total Table 3+ Compounds (20 compounds)*
86
34
68
27
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<60
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<110
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<37 UJ
<37
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35 UJ
<35
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
2.3
Perfluorobutanoic Acid
4.4
3
4.6
7.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
2.2
4
7.9
12
Perfluorohexadecanoic acid (PFHxDA)
<2
<2 UJ
<2 UJ
6.2 J
Perfluorohexane Sulfonic Acid
<2
<2
<2
2.3
Perfluorohexanoic Acid
3.4
6.8
11
18
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2 UJ
<2 UJ
<2 UJ
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
3.6
6
11
18
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
4.9
3.1
30
4.4
PFOS
3.2
2.2
2.1
3.4
TR0795A Page 32 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
19B
19B
19B
19B
Sampling Event
December 2019
January 2020
April 2020
May/June 2020
Field Sample ID
STW-LOC-19B-122019
STW-LOC19B-012920
STW-LOC-19B-042820
STW-LOC19B-060320
Date Sampled
12/20/2019
1/29/2020
4/28/2020
6/3/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
22 B
75
54
2.2 J
PFMOAA
5.6
14 J
37
<2 UJ
PFO2HxA
4.3
230
26
2.7 J
PFO3OA
<2
19
6.2
<2 UJ
PFO4DA
<2
<2
2.5 J
<2 UJ
PFO5DA
<2
<2
6.1
<2 UJ
PMPA
35 B
120
44
<13 UJ
PEPA
<20
46
<20
<2 UJ
PS Acid
<2
2.9
<2
<2 UJ
Hydro -PS Acid
<2
<2
4.3
<2 UJ
R-PSDA
<2
<2
22 J
<2 UJ
Hydrolyzed PSDA
2.2 J
5.3 J
22 J
<2 UJ
R-PSDCA
<2
<2
<2
<2 UJ
NVHOS
<2
<2
5.1
<2 UJ
EVE Acid
<2
<2
<2
<2 UJ
Hydro -EVE Acid
<2
<2
2.3
<2 UJ
R-EVE
<2
<2
12 J
<2 UJ
PES
<2
<2
<2
<2 UJ
PFECA B
<2
<2
<2
<2 UJ
PFECA-G
<2 UJ
<2
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
67
510
190
4.9
Total Table 3+ Compounds (20 compounds)*
69
510
240
4.9
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<3.2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<52
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<8.5
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<14
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2.4
ADONA
<2.1
<2.1
<2.1
--
DONA
--
--
--
<2
NaDONA
<2.1
<2.1
<2.1
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<8.7
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<4.3
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<31
Perfluorobutane Sulfonic Acid
<2
<2
3.6
<2
Perfluorobutanoic Acid
2.2
5.9
5.6
3.7
Perfluorodecane Sulfonic Acid
<2
<2
<2
<3.2
Perfluorodecanoic Acid
<2
<2
<2
<3.1
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<4.5
Perfluorododecanoic Acid
<2
<2
<2
<5.5
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
2.7
3.5
5.1
<2.5
Perfluorohexadecanoic acid (PFHxDA)
<2 UJ
<2
<2
<8.9 UJ
Perfluorohexane Sulfonic Acid
<2
<2
2.8
3.7
Perfluorohexanoic Acid
5.2
5.8
9.1
<5.8
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2.7
Perfluorooctadecanoic acid
<2 UJ
<2
<2
<4.6 UJ
Perfluorooctane Sulfonamide
<2
<2
<2
5.2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<3
Perfluoropentanoic Acid
3.9
7.9
9.8
6.6
Perfluorotetradecanoic Acid
<2
<2
<2
<2.9 UJ
Perfluorotridecanoic Acid
<2
<2
<2
<13
Perfluoroundecanoic Acid
<2
<2
<2
<11
PFOA
<2
3.2
9.6
<8.5
PFOS
2.4
<2
4.7
7.8
TR0795A Page 33 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
19B
20
20
20
Sampling Event
August 2020
April 2019
April 2019
June 2019
Field Sample ID
STW-LOC-19B-082620
DSTW-LOC20-042419
DSTW-LOC20-042419-D
STW-LOC20-062819
Date Sampled
8/26/2020
04/24/2019
04/24/2019
06/28/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
4.7
61
63
50
PFMOAA
<2
53 J
56 J
48
PFO2HxA
6.2
30 J
31 J
28
PFO3OA
<2
6.9 J
6.7 J
9.3
PFO4DA
<2
3.7 J
3.5 J
8.7
PFO5DA
<2
<2 UJ
<2 UJ
20
PMPA
<20
37 J
35 J
30
PEPA
<10
<20 UJ
<20 UJ
<20
PS Acid
<2
5.3 J
5.5 J
260
Hydro -PS Acid
<2
7.8 J
7.9 J
110
R-PSDA
<2
28 J
27 J
69 J
Hydrolyzed PSDA
<2
68 J
68 J
390 J
R-PSDCA
<2
<2 UJ
<2 UJ
2
NVHOS
<2
2.9 J
2.4 J
14
EVE Acid
<2
2 J
<2 UJ
7.3
Hydro -EVE Acid
<2
<2 UJ
<2 UJ
<2
R-EVE
<2
6.6 J
7.8 J
12 J
PES
<2
<2 UJ
<2 UJ
<2
PFECA B
<2
<2 UJ
<2 UJ
<2
PFECA-G
<2
<2 UJ
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
11
210
210
590
Total Table 3+ Compounds (20 compounds)*
11
310
310
1,100
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2.0
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
<2 UJ
--
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<60
<60
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<110
<110
<2
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2 UJ
--
--
--
ADONA
--
<2.1
<2.1
<2.1
DONA
<2 UJ
--
--
--
NaDONA
--
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2 UJ
<37
<37
<2
N-methyl perfluoro-l-octanesulfonamide
<2 UJ
<35
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
2.2
2.2
3.8
Perfluorobutanoic Acid
2.2
6.5
5.9
8.8
Perfluorodecane Sulfonic Acid
<2
<2.0
<2.0
<2
Perfluorodecanoic Acid
<2
<2.0
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2 UJ
<2.0
<2.0
<2
Perfluorododecanoic Acid
<2
<2.0
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2 UJ
<2.0
<2.0
<2
Perfluoroheptanoic Acid
<2
7.1
7
15
Perfluorohexadecanoic acid (PFHxDA)
<8
<2.0
<2.0
<2
Perfluorohexane Sulfonic Acid
<2 UJ
3.5
3.5
5.8
Perfluorohexanoic Acid
2.9
7.8
7.7
23
Perfluorononanesulfonic acid
<2 UJ
<2.0
<2.0
<2
Perfluorononanoic Acid
<2 UJ
<2.0
<2.0
<2
Perfluorooctadecanoic acid
<2
<2.0 UJ
<2.0
<2
Perfluorooctane Sulfonamide
<2 UJ
<2.0
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2.0
<2.0
<2
Perfluoropentanoic Acid
3.9
6.7
7.6
17
Perfluorotetradecanoic Acid
<2 UJ
<2.0
<2.0
<2
Perfluorotridecanoic Acid
<2
<2.0
<2.0
<2
Perfluoroundecanoic Acid
<2
<2.0
<2.0
<2
PFOA
3.4 J
8.7
8.5
9.3
PFOS
2.1 J
13
13
15
TR0795A Page 34 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
20
20
20
20
Sampling Event
August 2019
August 2019
October 2019
October 2019
Field Sample ID
STW-LOC20-082219
STW-LOC20-082219-D
STW-LOC20-101019
STW-LOC20-100919-D
Date Sampled
8/22/2019
8/22/2019
10/10/2019
10/10/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Field Duplicate
--
Field Duplicate
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
49 J
71 J
30 J
34
PFMOAA
650 J
630
24 J
21 J
PFO2HxA
210 J
210
18
19
PFO3OA
71
71
5.7
5.7
PFO4DA
44
46
4.3
4.6
PFO5DA
19
22
7.6 J
7.3 J
PMPA
39
46
34
27
PEPA
<20
<20
<20
<20
PS Acid
39
40
17
16
Hydro -PS Acid
70
67
46
41
R-PSDA
63 J
74 J
31 J
18 J
Hydrolyzed PSDA
540 J
640 J
190 J
160 J
R-PSDCA
<2
<2
<2
<2
NVHOS
28
28
13 J
8.7 J
EVE Acid
8.6
8.3
3.8
3.3
Hydro -EVE Acid
6.4
6.3
<2
<2
R-EVE
11 J
12 J
6.9 J
5.4 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
1,200
1,200
200
190
Total Table 3+ Compounds (20 compounds)*
1,800
2,000
430
370
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.2
4.2
6.3
6.2
Perfluorobutanoic Acid
10
10
19
24
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2 UJ
19 J
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
3
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
20
20
34 J
100 J
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
5.9
6.3
8.6
8.7
Perfluorohexanoic Acid
26
27
48 J
92 J
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2 UJ
40 J
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
27
26
47
65
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
8.3
PFOA
10
9.5
11 J
50 J
PFOS
14
14
15
14
TR0795A Page 35 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
20
20
20
20
Sampling Event
December 2019
December 2019
January 2020
January 2020
Field Sample ID
STW-LOC-20-122019
STW-LOC-20-122019-D
STW-LOC20-012920
STW-LOC20-012920-D
Date Sampled
12/20/2019
12/20/2019
1/29/2020
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Field Duplicate
--
Field Duplicate
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
42
47
89 J
66 J
PFMOAA
22
20
35 J
31
PFO2HxA
11
11
37
36
PFO3OA
2.7
2.8
3.1
3
PFO4DA
<2
<2
2.1
2.1
PFO5DA
2.2
<2
<2
<2
PMPA
33 B
32 B
27
31
PEPA
<20
<20
<20
<20
PS Acid
5.3
5.5
18
18
Hydro -PS Acid
2.2
2.1
2.9
2.8
R-PSDA
7.7 J
6.3 J
21 J
22 J
Hydrolyzed PSDA
49 J
44 J
85 J
82 J
R-PSDCA
<2
<2
<2
<2
NVHOS
2.4
2.2
2.6
2.3
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
4J
3.3 J
<2
7.5 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
120
120
220
190
Total Table 3+ Compounds (20 compounds)*
180
180
320
300
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3
3
2.2
2.2
Perfluorobutanoic Acid
5.4
4.5
3.8
3.2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
8.8
8.8
4.1
4
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
3.2
3.4
2.5
2.5
Perfluorohexanoic Acid
15
15
5.5
5.6
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2 UJ
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
11
11
5.9
5.7
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
5.7
5.9
4.3
4.2
PFOS
7.9
8
6.6
6.5
TR0795A Page 36 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
20
20
20
20
Sampling Event
April 2020
April 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC-20-4-042820
STW-LOC--D20-4-042820-
STW-LOC-20-2-052120
STW-LOC-20-4-042820
Date Sampled
4/28/2020
4/28/2020
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Field Duplicate
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
41
41
940
57
PFMOAA
14
13
850
<2
PFO2HxA
13
13
330
14
PFO3OA
2.5
2.7
130
3.2
PFO4DA
<2
<2
69
<2
PFO5DA
5.6
5.3
75
<2
PMPA
31
30
200
<20
PEPA
<20
<20
120
<10
PS Acid
30
32
720
24
Hydro -PS Acid
3.2
3.2
310
4.0
R-PSDA
18 J
16 J
780 J
12
Hydrolyzed PSDA
93 J
91 J
440 J
86
R-PSDCA
<2
<2
20
<2
NVHOS
6.7
6.5
71
<2
EVE Acid
<2
<2
150
12
Hydro -EVE Acid
<2
<2
20
9.6
R-EVE
3.8 J
<2
71 J
4.8
PES
<2
<2
<2.3
<2
PFECA B
<2
<2
<3
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
150
150
4,000
150
Total Table 3+ Compounds (20 compounds)*
260
250
5,300
260
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
--
--
DONA
--
--
<2
<2
NaDONA
<2.1
<2.1
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.5
3.6
3.9
4.1
Perfluorobutanoic Acid
6.1
6.3
20
6.0
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
4.8
4.6
13
3.8
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
4.5
4.5
4.9
4.2
Perfluorohexanoic Acid
9
9.2
12
7.1
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
2.5
<2
Perfluorooctadecanoic acid
<2 UJ
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
11
11
77
10
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.1
6
27
6.2
PFOS
11
11
11
11
TR0795A Page 37 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
21A
21A
21A
21A
Sampling Event
April 2019
June 2019
August 2019
October 2019
Field Sample ID
DSTW-LOC21A-042419
STW-LOC-21A-062719
STW-LOC21A-082119
STW-LOC21A-100919
Date Sampled
04/24/2019
06/27/2019
8/21/2019
10/9/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
33
40
57
97
PFMOAA
11 J
12 J
9.5 J
11 J
PFO2HxA
16 J
15 J
13
28
PFO3OA
2.9 J
2.9 J
2.4
12
PFO4DA
2 J
<2 UJ
<2
9.6
PFO5DA
<2 UJ
<2 UJ
2.2
6.6
PMPA
43 J
33 J
53
71
PEPA
<20 UJ
<20 UJ
<20
25
PS Acid
2.1 J
9.7 J
12
7.7
Hydro -PS Acid
<2 UJ
2.2 J
4.9
4.3
R-PSDA
4.2 J
19 J
31 J
32 J
Hydrolyzed PSDA
4.1 J
11 J
25 J
17 J
R-PSDCA
<2 UJ
<2 UJ
<2
<2
NVHOS
<2 UJ
2.5 J
33
8.4
EVE Acid
<2 UJ
<2 UJ
<2
7.4
Hydro -EVE Acid
<2 UJ
<2 UJ
3.8
3.9
R-EVE
3.4 J
4.1 J
34 J
19 J
PES
<2 UJ
<2 UJ
<2
<2
PFECA B
<2 UJ
<2 UJ
<2
<2
PFECA-G
<2 UJ
<2 UJ
<2
<2
Total Table 3+ Compounds (17 compounds)*
110
120
190
290
Total Table 3+ Compounds (20 compounds)*
120
150
280
360
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<60
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<110
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<37 UJ
<37
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35 UJ
<35
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2
4
4.5
6.8
Perfluorobutanoic Acid
5
9.8
12
17
Perfluorodecane Sulfonic Acid
<2.0
<2
<2
<2
Perfluorodecanoic Acid
<2.0
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2.0
<2
<2
<2
Perfluorododecanoic Acid
<2.0
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2.0
<2
<2
<2
Perfluoroheptanoic Acid
3
14
23
31
Perfluorohexadecanoic acid (PFHxDA)
<2.0
<2
<2
<2
Perfluorohexane Sulfonic Acid
3
6.2
6
9.8
Perfluorohexanoic Acid
4.4
23
29
41
Perfluorononanesulfonic acid
<2.0
<2
<2
<2
Perfluorononanoic Acid
<2.0
<2
<2
2
Perfluorooctadecanoic acid
<2.0
<2
<2
<2
Perfluorooctane Sulfonamide
<2.0
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.0
<2
<2
<2
Perfluoropentanoic Acid
4.8
21
30
40
Perfluorotetradecanoic Acid
<2.0
<2
<2
<2
Perfluorotridecanoic Acid
<2.0
<2
<2
<2
Perfluoroundecanoic Acid
<2.0
<2
<2
<2
PFOA
5.6
9.8
10
12
PFOS
9.1
14
16
23
TR0795A Page 38 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
21A
21A
21A
21A
Sampling Event
December 2019
January 2020
April 2020
May/June 2020
Field Sample ID
STW-LOC-21A-122019
STW-LOC21A-012920
STW-LOC-21A-042820
STW-LOC-21A-052120
Date Sampled
12/20/2019
1/29/2020
4/28/2020
5/20/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
43
31
220
420
PFMOAA
21
15 J
27
110
PFO2HxA
16
15
28
170
PFO3OA
2.6
2.1
5.8
31
PFO4DA
<2
<2
2.1 J
50
PFO5DA
2.5
<2
7.8
460
PMPA
54 B
34
43
180
PEPA
23
<20
<20
48
PS Acid
2.7
<2
<2
75
Hydro -PS Acid
<2
<2
<2
220
R-PSDA
7.3 J
<2
16 J
1,100 J
Hydrolyzed PSDA
12 J
8.7 J
16 J
33 J
R-PSDCA
<2
<2
<2
18
NVHOS
2.1
<2
3.7
37
EVE Acid
<2
<2
<2
5.2
Hydro -EVE Acid
<2
<2
<2
12
R-EVE
5J
<2
3.4 J
77 J
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
170
97
340
1,800
Total Table 3+ Compounds (20 compounds)*
190
110
370
3,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
--
DONA
--
--
--
<2
NaDONA
<2.1
<2.1
<2.1
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
2.4
2.6
3.7
2.2
Perfluorobutanoic Acid
5
5.2
27
11
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
6.2
5.2
5.3
7.6
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
3.3
3.3
4.5
3.1
Perfluorohexanoic Acid
10
8.2
11
7.7
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
2.7
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
8.8
7.9
12
33
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
4
4.7
6.8
4.8
PFOS
9.4
6.9
17
9.8
TR0795A Page 39 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
21A
22
22
22
Sampling Event
August 2020
April 2019
June 2019
August 2019
Field Sample ID
STW-LOC-21A-082620
DSTW-LOC22-042419
STW-LOC-22-062719
STW-LOC22-082119
Date Sampled
8/26/2020
04/24/2019
06/27/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
16
170
130 J
140
PFMOAA
<2
<5 UJ
220 J
36 J
PFO2HxA
14
<2 UJ
540 J
45 J
PFO3OA
2.2
3 J
27 J
5.5
PFO4DA
<2
5.3 J
32 J
6.5
PFO5DA
<2
<2 UJ
<6.7 UJ
3.8 J
PMPA
23
67 J
1,500 J
20 J
PEPA
<10
<20 UJ
210 J
<20
PS Acid
<2
2 J
180 J
47
Hydro -PS Acid
<2
18 J
150 J
54
R-PSDA
<2
160 J
500 J
59 J
Hydrolyzed PSDA
4.2
170 J
13,000 J
770 J
R-PSDCA
<2
<2 UJ
23 J
<2
NVHOS
<2
11 J
65 J
13 J
EVE Acid
<2
<2 UJ
<4.9 UJ
<2
Hydro -EVE Acid
<2
2.1 J
<5.6 UJ
3.9
R-EVE
<2
5.2 J
54 J
7.5 J
PES
<2
<2 UJ
<9.2 UJ
<2
PFECA B
<2
<2 UJ
<12 UJ
<2
PFECA-G
<2
<2 UJ
<8.2 UJ
<2 UJ
Total Table 3+ Compounds (17 compounds)*
55
280
3,100
370
Total Table 3+ Compounds (20 compounds)*
59
610
17,000
1,200
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2.0
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
--
--
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<52
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<60
<60
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<110
<110
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
--
--
<2
ADONA
--
<2.1
<2.1 UJ
<2.1
DONA
<2
--
--
--
NaDONA
--
<2.1
<2.1 UJ
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<37 UJ
<37
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<35 UJ
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<31
<20
<20
Perfluorobutane Sulfonic Acid
4.6
<2.0
3.4
<2
Perfluorobutanoic Acid
5.8
<3.5 UJ
37 J
5.4 J
Perfluorodecane Sulfonic Acid
<2
<3.2
<2
<2
Perfluorodecanoic Acid
<2
<3.1
2.4
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<4.5
<2
<2
Perfluorododecanoic Acid
<2
<5.5
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2.0
<2
<2
Perfluoroheptanoic Acid
3.6
7.1
12
6.7
Perfluorohexadecanoic acid (PFHxDA)
<2
<8.9
<2
<2
Perfluorohexane Sulfonic Acid
4.2
4.5
5.6
<2
Perfluorohexanoic Acid
7.3
<5.8
21 J
6.9
Perfluorononanesulfonic acid
<2
<2.0
<2
<2
Perfluorononanoic Acid
<2
<2.7
2.3
<2
Perfluorooctadecanoic acid
<2
<4.6
<2
<2
Perfluorooctane Sulfonamide
<2
<3.5
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<3.0
<2
<2
Perfluoropentanoic Acid
9.1
20
22 J
8
Perfluorotetradecanoic Acid
<2
2.9
<2
<2
Perfluorotridecanoic Acid
<2
<13
<2
<2
Perfluoroundecanoic Acid
<2
<11
<2
<2
PFOA
6.5
<8.5
9.8
7.5
PFOS
5.4
<5.4
18
3.6
TR0795A Page 40 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
22
22
22
22
Sampling Event
October 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC22-100919
STW-LOC22-100919-D
STW-LOC-22-122019
STW-LOC22-012920
Date Sampled
10/9/2019
10/9/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Field Duplicate
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
27
27
<14
<150
PFMOAA
37 J
56 J
25 J
<5 UJ
PFO2HxA
21
23
12 J
10 J
PFO3OA
7.2
8.1
5
3.5
PFO4DA
6.7
8.5
4.1 J
3
PFO5DA
7.1 J
14 J
2.3 J
<2 UJ
PMPA
40
37
<10 UJ
<10 UJ
PEPA
<20
<20
<20 UJ
<20
PS Acid
70
73
25 J
58
Hydro -PS Acid
63 J
130 J
25 J
18
R-PSDA
18 J
26 J
28 J
40 J
Hydrolyzed PSDA
210 J
300 J
490 J
260 J
R-PSDCA
<2
2.3
<2
<2
NVHOS
12
15
2.3 J
<2 UJ
EVE Acid
2.1
2.6
<2
<2
Hydro -EVE Acid
2.5
2.8
<2
<2
R-EVE
5J
4.5J
3J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
300
400
100
93
Total Table 3+ Compounds (20 compounds)*
530
730
620
390
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<19
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<32
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<200
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<520
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<85
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<140
6:2 Fluorotelomer sulfonate
<20
<20
<20
<200
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<24
ADONA
<2.1
<2.1
<2.1
<19
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<19
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<190
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<87
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<43
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<310
Perfluorobutane Sulfonic Acid
3.7
3.6
<2
<20
Perfluorobutanoic Acid
16 J
18 J
130 J
79
Perfluorodecane Sulfonic Acid
<2
<2
<2
<32
Perfluorodecanoic Acid
<2
<2
<2
<31
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<45
Perfluorododecanoic Acid
<2
<2
<2
<55
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<19
Perfluoroheptanoic Acid
24
24
4.1 J
<25
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2 UJ
<89
Perfluorohexane Sulfonic Acid
6.1
6.2
<2
28
Perfluorohexanoic Acid
34
33
<2 UJ
<58
Perfluorononanesulfonic acid
<2
<2
<2
<16
Perfluorononanoic Acid
<2
2
<2
<27
Perfluorooctadecanoic acid
<2
<2
<2 UJ
<46
Perfluorooctane Sulfonamide
<2
<2
<2
<35
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<30
Perfluoropentanoic Acid
32
32
<2 UJ
<49
Perfluorotetradecanoic Acid
<2
<2
<2
<29
Perfluorotridecanoic Acid
<2
<2
<2
<130
Perfluoroundecanoic Acid
<2
<2
<2
<110
PFOA
8.4
8.4
4.5
<85
PFOS
12
11
3.4 J
<54
TR0795A Page 41 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
22
22
22
23A
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-22-4-042820
STW-LOC22-4-060520
STW-LOC-22-4-082620
DSTW-LOC23A-042419
Date Sampled
4/28/2020
6/3/2020
8/26/2020
04/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
34
27 J
99 J
270
PFMOAA
56
110 J
<2
1,300
PFO2HxA
23
14 J
16
480
PFO3OA
7.6
4.9 J
5.6
140
PFO4DA
9.6
4 J
7.6
<79
PFO5DA
3.7
<2 UJ
6.4
<34
PMPA
11
37 J
<20
700
PEPA
<20
4.8 J
<10
<47
PS Acid
67
86 J
19
2,700
Hydro -PS Acid
30
34 J
59
140
R-PSDA
12 J
30 J
270
180 J
Hydrolyzed PSDA
370 J
640 J
1,200
2,200 J
R-PSDCA
<2
<2 UJ
2.7
<15
NVHOS
9.5
7.6 J
14
<54
EVE Acid
<2
<2 UJ
33
65
Hydro -EVE Acid
2
3.6 J
14
32
R-EVE
2.6 J
3.4 J
330
<70
PES
<2
<2 UJ
<2
<46
PFECA B
<2
<2 UJ
<2
<60
PFECA-G
<2
<2 UJ
<2
<41
Total Table 3+ Compounds (17 compounds)*
250
330
280
5,800
Total Table 3+ Compounds (20 compounds)*
640
1,000
2,100
8,200
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<3.2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<26
<52
<20 UJ
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<4.3
<8.5
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<7
<14
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2.4
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<4.4
<8.7
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2.2
<4.3
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<31
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
2.4
<2.0
Perfluorobutanoic Acid
15
6.3
<2 R
160
Perfluorodecane Sulfonic Acid
<2
<3.2
<2
<2.0
Perfluorodecanoic Acid
<2
<3.1
<2
<2.0
Perfluorododecane sulfonic acid (PFDoS)
<2.3
<4.5
<2
<2.0
Perfluorododecanoic Acid
<2.8
<5.5
<2
<2.0
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2.0
Perfluoroheptanoic Acid
3.1
<2.5
2.1
3.6
Perfluorohexadecanoic acid (PFHxDA)
<4.5 UJ
<8.9 UJ
--
<2.0
Perfluorohexane Sulfonic Acid
3.2
4.8
<2
2
Perfluorohexanoic Acid
<2.9
<5.8
3.7 J
6.6
Perfluorononanesulfonic acid
<2
<2
<2
<2.0
Perfluorononanoic Acid
<2
<2.7
<2
<2.0
Perfluorooctadecanoic acid
<2.3 UJ
<4.6 UJ
<2 UJ
<2.0
Perfluorooctane Sulfonamide
<2
<3.5
<2
<2.0
Perfluoropentane sulfonic acid (PFPeS)
<2
<3
<2
<2.0
Perfluoropentanoic Acid
8
7.6
15 J
13
Perfluorotetradecanoic Acid
<2
<2.9 UJ
<2
<2.0
Perfluorotridecanoic Acid
<6.5
<13
<2
<2.0
Perfluoroundecanoic Acid
<5.5
<11
<2
<2.0
PFOA
6.7
8.6
4.0
20
PFOS
<2.7
6.5
4.7
2.9
TR0795A Page 42 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23A
23A
23A
23A
Sampling Event
June 2019
August 2019
August 2019
August 2019
Field Sample ID
STW-LOC-23A-062719
STW-LOC23A-082119-1
STW-LOC23A-082119-2
STW-LOC23A-082119-3
Date Sampled
06/27/2019
8/21/2019
8/21/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
170
11,000
25,000
15,000
PFMOAA
320
1,200
1,300
1,600
PFO2HxA
240
280
350
390
PFO3OA
87
73
110
110
PFO4DA
<79
26
48
46
PFO5DA
<34 UJ
11
22
19
PMPA
1,300
82
120
<110
PEPA
560
33
54
45
PS Acid
17,000
4,500
12,000
12,000
Hydro -PS Acid
740
210
570
520
R-PSDA
220 J
190 J
400 J
350 J
Hydrolyzed PSDA
2,900 J
3,800 J
7,400 J
7,000 J
R-PSDCA
19
2
3.3
3.5
NVHOS
<54
49
100
94
EVE Acid
110
52
150
130
Hydro -EVE Acid
28
23
61
52
R-EVE
<70
16 J
25 J
27 J
PES
<46
<2.3
<9.2
<9.2
PFECA B
<60
<3
<12
<12
PFECA-G
<41
<2
<8.2
<8.2
Total Table 3+ Compounds (17 compounds)*
21,000
18,000
40,000
30,000
Total Table 3+ Compounds (20 compounds)*
24,000
22,000
48,000
37,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<3.1
<3.1
<3.2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<51
<50
<52
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<3
<12
<12
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<14
<13
<14
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2.4
<2.3
<2.4
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<37
<2
<7.5
<7.5
N-methyl perfluoro-l-octanesulfonamide
<35
<2
<6.9
<6.9
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<30
<30
<31
Perfluorobutane Sulfonic Acid
3.8
3.5
3.7
3.5
Perfluorobutanoic Acid
70
55
54
51
Perfluorodecane Sulfonic Acid
<2
<3.1
<3.1
<3.2
Perfluorodecanoic Acid
2.8
<3
<3
<3.1
Perfluorododecane sulfonic acid (PFDoS)
<2
<4.4
<4.3
<4.5
Perfluorododecanoic Acid
6.9
<5.4
<5.3
<5.5
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
14
24
25
26
Perfluorohexadecanoic acid (PFHxDA)
42
<8.7
<8.6
<8.8
Perfluorohexane Sulfonic Acid
5.8
6.2
6
6.1
Perfluorohexanoic Acid
24
26
26
24
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
2.9
3.5
5.2
5
Perfluorooctadecanoic acid
21
<4.5
<4.4
<4.6
Perfluorooctane Sulfonamide
<2
<3.4
<3.4
<3.5
Perfluoropentane sulfonic acid (PFPeS)
<2
<2.9
<2.9
<3
Perfluoropentanoic Acid
29
31
34
34
Perfluorotetradecanoic Acid
30
<2.8
<2.8
<2.9
Perfluorotridecanoic Acid
16
<13
<13
<13
Perfluoroundecanoic Acid
4.3
<11
<11
<11
PFOA
30
290
460
380
PFOS
19
23
33
33
TR0795A Page 43 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23A
23A
23A
23A
Sampling Event
August 2019
October 2019
December 2019
January 2020
Field Sample ID
STW-LOC23A-082119-4
STW-LOC23A-100919
STW-LOC-23A-122019
STW-LOC23A-012920
Date Sampled
8/21/2019
10/9/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
12,000
110
2,200
190
PFMOAA
1,200
890
1,100
500 J
PFO2HxA
310
200
240
130
PFO3OA
92
70
80
46
PFO4DA
42
44
37
29
PFO5DA
21 J
31
20
13
PMPA
<110
<57
<57
33
PEPA
42
20
33
<20
PS Acid
12,000
11,000
6,900
4,400
Hydro -PS Acid
530
570
330
200
R-PSDA
350 J
340 J
260 J
140 J
Hydrolyzed PSDA
7,000 J
5,900 J
3,500 J
2,000 J
R-PSDCA
3.1
2.9
<2
<2
NVHOS
89
61
39
19
EVE Acid
130
88
83
52
Hydro -EVE Acid
52
71
63
25
R-EVE
23 J
34 J
26 J
20 J
PES
<9.2
<4.6
<4.6
<2.3
PFECA B
<12
<6
<6
<3
PFECA-G
<8.2
<4.1
<4.1
<2
Total Table 3+ Compounds (17 compounds)*
27,000
13,000
11,000
5,600
Total Table 3+ Compounds (20 compounds)*
34,000
19,000
15,000
7,800
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<3.1
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<50
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<12
3.3
2.8
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<13
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2.3
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<7.5
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<6.9
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<30
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.9
6.7
2.3
3
Perfluorobutanoic Acid
49
18
180
45
Perfluorodecane Sulfonic Acid
<3.1
<2
<2
<2
Perfluorodecanoic Acid
5.1
4
2.4
<2
Perfluorododecane sulfonic acid (PFDoS)
<4.3
<2
<2
<2
Perfluorododecanoic Acid
<5.3
4
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
23
31
15
9.1
Perfluorohexadecanoic acid (PFHxDA)
<8.5
10
8.1
3.3
Perfluorohexane Sulfonic Acid
6.5
12
3.8
4
Perfluorohexanoic Acid
27
37
17
12
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
4.8
3.4
2.1 B
<2
Perfluorooctadecanoic acid
<4.4
6.8
4.9
<2
Perfluorooctane Sulfonamide
<3.3
2.1
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.9
<2
<2
<2
Perfluoropentanoic Acid
32
43
18
13
Perfluorotetradecanoic Acid
<2.8
8
6.4
3.6
Perfluorotridecanoic Acid
<12
6.9
5.2 B
2.4
Perfluoroundecanoic Acid
<11
3.2
<2
<2
PFOA
310
52
680
43
PFOS
32
27
11
9.7
TR0795A Page 44 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23A
23A
23A
23B
Sampling Event
April 2020
May/June 2020
August 2020
June 2019
Field Sample ID
STW-LOC-23A-4-042820
STW-LOC23A-4-060520
STW-LOC-23A-2-082620
STW-LOC-23B-062719
Date Sampled
4/28/2020
6/3/2020
8/26/2020
06/27/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
130
870 J
69
3,200
PFMOAA
1,000
1,800 J
520
160 J
PFO2HxA
230
400 J
110
150 J
PFO3OA
65
180 J
44
67 J
PFO4DA
20
69 J
<30
61 J
PFO5DA
<2
50 J
<39
77 J
PMPA
41
<150 UJ
<310
19,000 J
PEPA
<20
20 J
<10
8,500 J
PS Acid
4,900
24,000 J
6,000
49 J
Hydro -PS Acid
190
1,200 J
230
110 J
R-PSDA
89 J
400 J
160
580 J
Hydrolyzed PSDA
1,800 J
8,800 J
2,500
450 J
R-PSDCA
<2
5 J
<8.7
4.5 J
NVHOS
26
100 J
24
33 J
EVE Acid
30
190 J
47
5.1 J
Hydro -EVE Acid
8.9
54 J
7.4
21 J
R-EVE
5.6 J
19 J
<36
210 J
PES
<2.3
<2 UJ
<3.4
<9.2 UJ
PFECA B
<3
<6.6 UJ
<13
<12 UJ
PFECA-G
<2
<12 UJ
<24
<8.2 UJ
Total Table 3+ Compounds (17 compounds)*
6,600
29,000
7,100
31,000
Total Table 3+ Compounds (20 compounds)*
8,500
38,000
9,700
33,000
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<3.5
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<37
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
2.9
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
20 J
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
20
<20
<20
Perfluorobutane Sulfonic Acid
3.7
2.3
4.4
2.5
Perfluorobutanoic Acid
26
23
20
580
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
4.8
2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
3.9
7.8
4.1
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
6.4
8.3
4.6
10
Perfluorohexadecanoic acid (PFHxDA)
3.8
6.4
--
<2 UJ
Perfluorohexane Sulfonic Acid
4
3.8
3.8
<2
Perfluorohexanoic Acid
11
13
8.3
12
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
3.1
<2
2.5
Perfluorooctadecanoic acid
2.5
2
<2
<2 UJ
Perfluorooctane Sulfonamide
<2
<2
2.1
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
15
20
11
68
Perfluorotetradecanoic Acid
3.9
9
3.4
<2 UJ
Perfluorotridecanoic Acid
3.3
6.8
3.7
<2
Perfluoroundecanoic Acid
2.8
6.1
2.4
<2
PFOA
93
110
23
29
PFOS
13
17
17
5
TR0795A Page 45 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23B
23B
23B
23B
Sampling Event
October 2019
December 2019
January 2020
April 2020
Field Sample ID
STW-LOC23B-100919
STW-LOC-23B-122019
STW-LOC23B-012920
STW-LOC-23B-042820
Date Sampled
10/9/2019
12/20/2019
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
17
240
31
35
PFMOAA
200
13
11 J
19
PFO2HxA
56
7.3
7
15
PFO3OA
19
<2
<2
2.9
PFO4DA
10
<2
<2
<2
PFO5DA
8.5 J
<2
<2
4.1
PMPA
<28
24 B
26
32
PEPA
<20
<20
<20
<20
PS Acid
2,700
25
37
36
Hydro -PS Acid
120
<2
<2
<2
R-PSDA
100 J
<2
<2
<2
Hydrolyzed PSDA
1,700 J
26 J
34 J
19 J
R-PSDCA
<2
<2
<2
<2
NVHOS
20
<2
<2
4.2
EVE Acid
20
<2
<2
<2
Hydro -EVE Acid
14
<2
<2
<2
R-EVE
10 J
<2
<2
2.2 J
PES
<2.3
<2
<2
<2
PFECA B
<3
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
3,200
310
110
150
Total Table 3+ Compounds (20 compounds)*
5,000
340
150
170
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
5.4
2.7
2
3.5
Perfluorobutanoic Acid
18
4
3.3
5.3
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
30
6.6
2.9
4.2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
6.8
3.2
<2
3.9
Perfluorohexanoic Acid
43
12
3.8
8.2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
40
8.2
4
9.2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
13
26
12
8.6
PFOS
14
7.9
5.3
9.3
TR0795A Page 46 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
23B
23B
24A
24A
Sampling Event
May/June 2020
August 2020
April 2019
April 2019
Field Sample ID
STW-LOC23B-060320
STW-LOC-23B-082620
DSTW-LOC24A-042419
DSTW-LOC24A-042419-
D
Date Sampled
6/3/2020
8/26/2020
4/24/2019
4/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
Field Duplicate
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
57
25
16 J
14
PFMOAA
3.7
<2
7.5 J
<5 UJ
PFO2HxA
6.3
18
9.9 J
12 J
PFO3OA
<2
2.8
<2 UJ
<2 UJ
PFO4DA
<2
<2
<2 UJ
<2 UJ
PFO5DA
<2
<2
<2 UJ
<2 UJ
PMPA
31
32
25 J
26 J
PEPA
<2
<10
<20 UJ
<20 UJ
PS Acid
32
33
<2 UJ
<2 UJ
Hydro -PS Acid
<2
2.0
<2 UJ
<2 UJ
R-PSDA
<2
<2
3.6 J
5.4 J
Hydrolyzed PSDA
14 J
35
2.7 J
3.1 J
R-PSDCA
<2
<2
<2 UJ
<2 UJ
NVHOS
<2
<2
<2 UJ
<2 UJ
EVE Acid
<2
<2
<2 UJ
<2 UJ
Hydro -EVE Acid
<2
<2
<2 UJ
<2 UJ
R-EVE
<2
<2
4 J
4.2 J
PES
<2
<2
<2 UJ
<2 UJ
PFECA B
<2
<2
<2 UJ
<2 UJ
PFECA-G
<2
<2
< UJ
<2 UJ
Total Table 3+ Compounds (17 compounds)*
130
110
58
52
Total Table 3+ Compounds (20 compounds)*
140
150
69
65
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2.0
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<2
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<60
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<110
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
--
--
ADONA
--
--
<2.1
<2.1
DONA
<2
<2
--
--
NaDONA
--
--
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<2
<2
<37 UJ
<37 UJ
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<35 UJ
<35 UJ
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.1
4.4
2.3
2.3
Perfluorobutanoic Acid
5.2
5.5
6.3
5.8
Perfluorodecane Sulfonic Acid
<2
<2
<2.0
<2.0
Perfluorodecanoic Acid
<2
<2
<2.0
<2.0
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2.0
<2.0
Perfluorododecanoic Acid
<2
<2
<16
<2.0
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2.0
<2.0
Perfluoroheptanoic Acid
3.4
3.6
7
7.3
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2.0
<2.0
Perfluorohexane Sulfonic Acid
2.6
4.0
3.9
3.8
Perfluorohexanoic Acid
6.8
7.5
8.5
8.8
Perfluorononanesulfonic acid
<2
<2
<2.0
<2.0
Perfluorononanoic Acid
<2
<2
2
<2.0
Perfluorooctadecanoic acid
<2
<2
<2.0
<2.0
Perfluorooctane Sulfonamide
<2
<2
<2.0
<2.0
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2.0
<2.0
Perfluoropentanoic Acid
5.8
7.9
7
6.7
Perfluorotetradecanoic Acid
<2
<2
<5.9
<2.0
Perfluorotridecanoic Acid
<2
<2
<14
<2.0
Perfluoroundecanoic Acid
<2
<2
<2
<2.0
PFOA
7.3
6.9
9.5
9.7
PFOS
9.4
12
25
21
TR0795A Page 47 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24A
24A
24A
24A
Sampling Event
June 2019
June 2019
August 2019
August 2019
Field Sample ID
STW-LOC-24A-062719
STW-LOC--D24A-062719-
STW-LOC24A-082119
STW-LOC24A-082119-D
Date Sampled
06/27/2019
06/27/2019
8/21/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
Field Duplicate
--
Field Duplicate
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
26
26
16
17
PFMOAA
<5 UJ
<5 UJ
11
12
PFO2HxA
14 J
14 J
12
13
PFO3OA
2.3 J
2.3 J
<2
2.1
PFO4DA
<2 UJ
<2 UJ
<2
<2
PFO5DA
<2 UJ
<2 UJ
<2
<2
PMPA
30 J
30 J
26
28
PEPA
<20 UJ
<20 UJ
<20
<20
PS Acid
2.2 J
2.2 J
<2
<2
Hydro -PS Acid
<2.2 J
<2.2 J
<2
<2
R-PSDA
4.4 J
4.4 J
9.7 J
11 J
Hydrolyzed PSDA
<2 UJ
<2 UJ
4 J
4.2 J
R-PSDCA
<2 UJ
<2 UJ
<2
<2
NVHOS
2J
2J
4.7
5.3
EVE Acid
<2 UJ
<2 UJ
<2
<2
Hydro -EVE Acid
4.4 J
4.4 J
<2
<2
R-EVE
2.3 J
2.3 J
4.5 J
3.9 J
PES
<2 UJ
<2 UJ
<2
<2
PFECA B
<2 UJ
<2 UJ
<2
<2
PFECA-G
<2 UJ
<2 UJ
<2
<2
Total Table 3+ Compounds (17 compounds)*
81
81
70
77
Total Table 3+ Compounds (20 compounds)*
88
88
88
97
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
--
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<60
<60
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<110
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<37
<37
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<35
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.4
3.4
4.1
3.7
Perfluorobutanoic Acid
9.4
9.4
9.3
9
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
2.2
2.2
2.5
2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
13
13
19
18
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
6
6
6
5.8
Perfluorohexanoic Acid
21
21
26
26
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
2.7
2.7
2.7
2.1
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
17
17
25
27
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
11 J
11 J
11
10
PFOS
30 J
30 J
27 J
22 J
TR0795A Page 48 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24A
24A
24A
24A
Sampling Event
December 2019
January 2020
January 2020
April 2020
Field Sample ID
STW-LOC-24A-122019
STW-LOC24A-012920
STW-LOC24A-012920-D
STW-LOC-24A-042820
Date Sampled
12/20/2019
1/29/2020
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
18 B
11
8.7
10
PFMOAA
12
9.9 J
9.3
7.1
PFO2HxA
6.1
6.5
6.2
8.8
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
4.6
PMPA
41 B
46
47
27
PEPA
22
23
25
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
10 J
Hydrolyzed PSDA
12 J
5.4 J
5.2 J
4 J
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
5.3
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
99
96
96
63
Total Table 3+ Compounds (20 compounds)*
110
100
100
77
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.1
2.1
2
3.6
Perfluorobutanoic Acid
<2
4.5
4.2
7.6
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2 UJ
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
8.6
3.8
3.5
4.8
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
4.4
2.5
2.4
4.8
Perfluorohexanoic Acid
15
5.4
5.1
9
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
2.8 B
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2 UJ
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2 UJ
<2
<2
Perfluoropentanoic Acid
10
4.8
4.5
10
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
16 B
<2
<2
<2
Perfluoroundecanoic Acid
3.1 B
<2
<2
<2
PFOA
7.6
3.9
3.5
6.8
PFOS
17
6.3
6.2
17
TR0795A Page 49 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24A
24A
24A
24A
Sampling Event
April 2020
May/June 2020
May/June 2020
August 2020
Field Sample ID
STW-LOC--D24A-042820-
STW-LOC24A-060320
STW-LOC24A-060320-D
STW-LOC-24A-082620
Date Sampled
4/28/2020
6/3/2020
6/3/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Field Duplicate
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
10
38 J
20 J
28
PFMOAA
6.9
<2 UJ
<2 UJ
18 J
PFO2HxA
8.5
6.4 J
7.4 J
26 J
PFO3OA
<2
<2 UJ
<2 UJ
4.1
PFO4DA
<2
<2 UJ
<2 UJ
<2
PFO5DA
5.1
<2 UJ
<2 UJ
<2
PMPA
25
96 J
63 J
53 J
PEPA
<20
140 J
53 J
18 J
PS Acid
<2
<2 UJ
<2 UJ
<2
Hydro -PS Acid
<2
<2 UJ
<2 UJ
<2
R-PSDA
11 J
<2 UJ
<2 UJ
<2
Hydrolyzed PSDA
3.4 J
<2 UJ
<2 UJ
7.9 J
R-PSDCA
<2
<2 UJ
<2 UJ
<2
NVHOS
5.1
<2 UJ
<2 UJ
<2
EVE Acid
<2
<2 UJ
<2 UJ
<2
Hydro -EVE Acid
<2
<2 UJ
<2 UJ
<2
R-EVE
<2
<2 UJ
<2 UJ
35 J
PES
<2
<2 UJ
<2 UJ
<2
PFECA B
<2
<2 UJ
<2 UJ
<2
PFECA-G
<2
<2 UJ
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
61
280
140
150
Total Table 3+ Compounds (20 compounds)*
75
280
140
190
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
--
--
--
DONA
--
<2
<2
<2
NaDONA
<2.1
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.7
3.2
2.9
4.3
Perfluorobutanoic Acid
7.3
13
13
6.1
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
5
6.1
6.1
3.5
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
5
3.1
3.3
4.3
Perfluorohexanoic Acid
8.8
9.6
9.2
7.2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
10
11
11
8.7
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.6
6.1
6.8
6.6
PFOS
16
8.9 J
12 J
13
TR0795A Page 50 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24A
24B
24B
24B
Sampling Event
August 2020
April 2019
June 2019
August 2019
Field Sample ID
STW-LOC--D24A-082620-
DSTW-LOC24B-042419
STW-LOC24B-062719
STW-LOC24B-082119
Date Sampled
8/26/2020
04/24/2019
06/27/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Field Duplicate
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
30
14
10
8.9
PFMOAA
18
11 J
<5
<5
PFO2HxA
14 J
11 J
8.1
6.7
PFO3OA
2.2
<2 UJ
<2
<2
PFO4DA
<2
<2 UJ
<2
<2
PFO5DA
<2
<2 UJ
<2
<2
PMPA
21 J
19 J
17
16
PEPA
<10
<20 UJ
<20
<20
PS Acid
<2
<2 UJ
77
<2
Hydro -PS Acid
<2
<2 UJ
3.3
<2
R-PSDA
3
5.1 J
<2
5.3 J
Hydrolyzed PSDA
4 J
4.3 J
11 J
2.4 J
R-PSDCA
<2
<2 UJ
<2
<2
NVHOS
<2
<2 UJ
<2
4.3
EVE Acid
<2
<2 UJ
<2
<2
Hydro -EVE Acid
<2
<2 UJ
<2
<2
R-EVE
<2
3.8 J
<2
2.2 J
PES
<2
<2 UJ
<2
<2
PFECA B
<2
<2 UJ
<2
<2
PFECA-G
<2
<2 UJ
<2
<2
Total Table 3+ Compounds (17 compounds)*
85
55
120
36
Total Table 3+ Compounds (20 compounds)*
92
68
130
46
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2.0
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
--
--
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<60
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<110
<2
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
--
--
<2
ADONA
--
<2.1
<2.1
<2.1
DONA
<2
--
--
--
NaDONA
--
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<37
2.9
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<35
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
4.5
2.2
3.5
4.3
Perfluorobutanoic Acid
6.2
5.5
9.6
9.5
Perfluorodecane Sulfonic Acid
<2
<2.0
<2
<2
Perfluorodecanoic Acid
<2
<2.0
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2.0
<2
<2
Perfluorododecanoic Acid
<2
<2.0
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2.0
<2
<2
Perfluoroheptanoic Acid
3.3
6
13
21
Perfluorohexadecanoic acid (PFHxDA)
--
<2.0
<2
<2
Perfluorohexane Sulfonic Acid
4.3
3.3
5
5.8
Perfluorohexanoic Acid
7.7
8
19
25
Perfluorononanesulfonic acid
<2
<2.0
<2
<2
Perfluorononanoic Acid
<2
<2.0
<2
<2
Perfluorooctadecanoic acid
<2
<2.0
<2
<2
Perfluorooctane Sulfonamide
<2
<2.0
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2.0
<2
<2
Perfluoropentanoic Acid
8.2
6.2
17
25
Perfluorotetradecanoic Acid
<2
<2.0
<2
<2
Perfluorotridecanoic Acid
<2
<2.0
<2
<2
Perfluoroundecanoic Acid
<2
<2.0
<2
<2
PFOA
6.3
7.7
8.3
9.5
PFOS
11
12
14
16
TR0795A Page 51 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24B
24B
24B
24B
Sampling Event
October 2019
December 2019
December 2019
January 2020
Field Sample ID
STW-LOC24B-100919
STW-LOC-24B-122019
STW-LOC-24B-122019-D
STW-LOC24B-012920
Date Sampled
10/9/2019
12/20/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
Field Duplicate
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
8.5
11 B
8.7 B
12
PFMOAA
<5 UJ
12
13
8.2 J
PFO2HxA
7.1
6.5
5.1
6.2
PFO3OA
2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
18
27 B
29 B
24
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
6.9 J
<2
3.7 J
<2
Hydrolyzed PSDA
4.4 J
5.2 J
6.2 J
3.7 J
R-PSDCA
<2
<2
<2
<2
NVHOS
7
<2
<2
<2
EVE Acid
9.6
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
2.6 J
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
52
57
56
50
Total Table 3+ Compounds (20 compounds)*
64
62
68
54
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
6.2
2.8
2.7
<2
Perfluorobutanoic Acid
18
3.9 J
3.9
3.9
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
34
6.8 J
6.8
2.8
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
8.5
3.1
3.2
2.1
Perfluorohexanoic Acid
49
13 J
12
4.1
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
46
8.3 J
9.9
4.3
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
11
4.6 J
4.6
3
PFOS
15
7.5
7.9
5.3
TR0795A Page 52 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24B
24B
24B
24C
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-24B-042820
STW-LOC24B-060320
STW-LOC-24B-082620
DSTW-LOC24C-042419
Date Sampled
4/28/2020
6/3/2020
8/26/2020
04/24/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
--
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
16
4.7
15
19
PFMOAA
15
3.2
<2
11 J
PFO2HxA
12
5.8
13
12 J
PFO3OA
2.4
<2
2.1
<2 UJ
PFO4DA
<2
<2
<2
<2 UJ
PFO5DA
5.6
<2
<2
<2 UJ
PMPA
26
33
22
28 J
PEPA
<20
<2
<10
<20 UJ
PS Acid
<2
<2
<2
14 J
Hydro -PS Acid
<2
<2
<2
2.1 J
R-PSDA
<2
<2
15
39 J
Hydrolyzed PSDA
5.5 J
<2
5.5
51 J
R-PSDCA
<2
<2
<2
<2 UJ
NVHOS
4.5
<2
<2
4 J
EVE Acid
<2
<2
<2
6.8 J
Hydro -EVE Acid
<2
<2
<2
3.7 J
R-EVE
2.2 J
<2
<2
36 J
PES
<2
<2
<2
<2 UJ
PFECA B
<2
<2
<2
<2 UJ
PFECA-G
<2
<2
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
82
47
52
100
Total Table 3+ Compounds (20 compounds)*
89
47
73
230
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2.0
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.5
2.8
4.1
2
Perfluorobutanoic Acid
5.4
6.3 J
5.3
4.7
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
4.4
3.5
3.3
5.9
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
4.4
3.1
4.1
3.4
Perfluorohexanoic Acid
9.1
7.7
6.7
7
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
10
6.4
8.0
6.4
Perfluorotetradecanoic Acid
<2
<2
<2
<2.0
Perfluorotridecanoic Acid
<2
<2
<2
<2.0
Perfluoroundecanoic Acid
<2
<2
<2
<2.0
PFOA
5.7
5.5
6.0
7.3
PFOS
12
9
12
15
TR0795A Page 53 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24C
24C
24C
24C
Sampling Event
June 2019
August 2019
December 2019
January 2020
Field Sample ID
STW-LOC24C-062719
STW-LOC24C-082119
STW-LOC-24C-122019
STW-LOC24C-012920
Date Sampled
06/27/2019
8/21/2019
12/20/2019
1/29/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
--
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
16
13
270
11
PFMOAA
<5
<5
<21
10 J
PFO2HxA
8.6
7.6
46
7.2
PFO3OA
<2
<2
20
<2
PFO4DA
<2
<2
13
<2
PFO5DA
<2
<2
12
<2
PMPA
14
23
61 B
26
PEPA
<20
<20
31
<20
PS Acid
3.5
21
490
4.4
Hydro -PS Acid
<2
3.3
130
<2
R-PSDA
13 J
18 J
470 J
8 J
Hydrolyzed PSDA
5.3 J
53 J
1,300 J
44 J
R-PSDCA
<2
<2
11
<2
NVHOS
2
6.7
260
4.7
EVE Acid
<2
2.1
930
5.6
Hydro -EVE Acid
<2
<2
290
2.2
R-EVE
3.9 J
5.4 J
170 J
<2
PES
<2
<2
<4.6
<2
PFECA B
<2
<2
<6
<2
PFECA-G
<2
<2
<4.1
<2
Total Table 3+ Compounds (17 compounds)*
44
77
2,600
71
Total Table 3+ Compounds (20 compounds)*
66
150
4,500
120
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<2
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
2.3
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.8
4.5
2.9
<2
Perfluorobutanoic Acid
8
8.4
5.3
3.3
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
13
22
7.1
2.8
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
5.1
6.1
3.2
2
Perfluorohexanoic Acid
21
27
13
3.9
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
17
26
11
4
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
7.9
9.8
5.3
2.8
PFOS
15
13
8.1
5.5
TR0795A Page 54 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
24C
24C
24C
TBLK
Sampling Event
April 2020
May/June 2020
August 2020
April 2019
Field Sample ID
STW-LOC-24C-042820
STW-LOC24C-060320
STW-LOC-24C-082620
DSTW-TB-042519
Date Sampled
4/28/2020
6/3/2020
8/26/2020
04/25/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
--
--
--
Trip Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
16
5.6
14
<4.0
PFMOAA
15
3
7.4
<5 UJ
PFO2HxA
13
6.1
13
<2 UJ
PFO3OA
2.2
<2
2.1
<2 UJ
PFO4DA
<2
<2
<2
<2 UJ
PFO5DA
5
<2
<2
<2 UJ
PMPA
26
31
47
<10 UJ
PEPA
<20
<2
<10
<20 UJ
PS Acid
16
8.9
2.7
<2 UJ
Hydro -PS Acid
<2
<2
<2
<2 UJ
R-PSDA
15 J
30 J
20
<2 UJ
Hydrolyzed PSDA
25 J
22 J
14
<2 UJ
R-PSDCA
<2
<2
<2
<2 UJ
NVHOS
5.2
3.4
7.5
<2 UJ
EVE Acid
5.9
2.6
<2
<2 UJ
Hydro -EVE Acid
2.4
<2
<2
<2 UJ
R-EVE
<2
3.4 J
11
<2 UJ
PES
<2
<2
<2
<2 UJ
PFECA B
<2
<2
<2
<2 UJ
PFECA-G
<2
<2
<2
<2 UJ
Total Table 3+ Compounds (17 compounds)*
110
61
94
ND
Total Table 3+ Compounds (20 compounds)*
150
120
140
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<60
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<110
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
--
ADONA
<2.1
--
--
<2.1
DONA
--
<2
<2
--
NaDONA
<2.1
--
--
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<37
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<35
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
3.5
2.9
4.0
<2
Perfluorobutanoic Acid
5.4
4.9
4.8
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
4.5
3.9
3.3
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
--
<2
Perfluorohexane Sulfonic Acid
4.3
2.8
4.0
<2
Perfluorohexanoic Acid
8.7
8
6.5
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
10
5.4
7.2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
6.5
5.7
5.5
<2
PFOS
11
10
9.2
<2
TR0795A Page 55 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
TBLK
TBLK
TBLK
TBLK
Sampling Event
June 2019
August 2019
October 2019
December 2019
Field Sample ID
STW-TBLK-1
STW-TBLK-082219
STW-TBLK-100919
STW-TB-122619
Date Sampled
06/28/2019
8/22/2019
10/9/2019
12/26/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Trip Blank
Trip Blank
Trip Blank
Trip Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<2
<4
6.7
PFMOAA
<5
<5
<5
<5
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
<10
<10
11
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
18
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
18
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<2
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
2.9
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
27
Perfluoroundecanoic Acid
<2
<2
<2
5
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 56 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
TBLK
TBLK
TBLK
TBLK
Sampling Event
January 2020
April 2020
May/June 2020
August 2020
Field Sample ID
STW-LOCTB-012920
STW-LOC-TB-042820
STW-TB-052120
STW-TBLK-082620
Date Sampled
1/29/2020
4/28/2020
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Trip Blank
Trip Blank
Trip Blank
Trip Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<4
<2
<4
PFMOAA
<5
<5
<5
<2
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
<10
<10
<20
PEPA
<20
<20
<20
<10
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
--
--
DONA
--
--
<2
<2
NaDONA
<2.1
<2.1
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
--
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 57 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EQBLK
EQBLK
EQBLK
EQBLK
Sampling Event
April 2019
April 2019
April 2019
June 2019
Field Sample ID
DSTW-EB-01-042419
DSTW-EB-02-042419
DSTW-EB-03-042419
STW-EQBLK-1
Date Sampled
04/24/2019
04/24/2019
04/24/2019
06/28/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4.0
<4.0
<4.0
<4
PFMOAA
<5 UJ
<5 UJ
<5 UJ
<5
PFO2HxA
<2 UJ
<2 UJ
<2 UJ
<2
PFO3OA
<2 UJ
<2 UJ
<2 UJ
<2
PFO4DA
<2 UJ
<2 UJ
<2 UJ
<2
PFO5DA
<2 UJ
<2 UJ
<2 UJ
<2
PMPA
<10 UJ
<10 UJ
<10 UJ
<10
PEPA
<20 UJ
<20 UJ
<20 UJ
<20
PS Acid
<2 UJ
<2 UJ
<2 UJ
<2
Hydro -PS Acid
<2 UJ
<2 UJ
<2 UJ
<2
R-PSDA
<2 UJ
<2 UJ
<2 UJ
<2
Hydrolyzed PSDA
<2 UJ
<2 UJ
<2 UJ
<2
R-PSDCA
<2 UJ
<2 UJ
<2 UJ
<2
NVHOS
<2 UJ
<2 UJ
<2 UJ
<2
EVE Acid
<2 UJ
<2 UJ
<2 UJ
<2
Hydro -EVE Acid
<2 UJ
<2 UJ
<2 UJ
<2
R-EVE
<2 UJ
<2 UJ
<2 UJ
<2
PES
<2 UJ
<2 UJ
<2 UJ
<2
PFECA B
<2 UJ
<2 UJ
<2 UJ
<2
PFECA-G
<2 UJ
<2 UJ
<2 UJ
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2.0
<2.0
<2.0
<2
F-53B Minor (11C1-PF3OUdS)
--
--
--
--
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
820 J
850 J
780 J
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<110
<110
<110
<2
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
--
--
--
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro-l-octanesulfonamide
<37 UJ
<37 UJ
<37
<2
N-methyl perfluoro-l-octanesulfonamide
<35
<35
<35
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2.0
<2.0
<2.0
<2
Perfluorobutanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorodecane Sulfonic Acid
<2.0
<2.0
<2.0
<2
Perfluorodecanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorododecane sulfonic acid (PFDoS)
<2.0
<2.0
<2.0
<2
Perfluorododecanoic Acid
<2.0
<2.0
<2.0
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2.0
<2.0
<2.0
<2
Perfluoroheptanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorohexadecanoic acid (PFHxDA)
<2.0
<2.0
<2.0
<2
Perfluorohexane Sulfonic Acid
<2.0
<2.0
<2.0
<2
Perfluorohexanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorononanesulfonic acid
<2.0
<2.0
<2.0
<2
Perfluorononanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorooctadecanoic acid
<2.0
<2.0
<2.0
<2
Perfluorooctane Sulfonamide
<2.0
<2.0
<2.0
<2
Perfluoropentane sulfonic acid (PFPeS)
<2.0
<2.0
<2.0
<2
Perfluoropentanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorotetradecanoic Acid
<2.0
<2.0
<2.0
<2
Perfluorotridecanoic Acid
<2.0
<2.0
<2.0
<2
Perfluoroundecanoic Acid
<2.0
<2.0
<2.0
<2
PFOA
<2.0
<2.0
<2.0
<2
PFOS
<2.0
<2.0
<2.0
<2
TR0795A Page 58 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EQBLK
EQBLK
EQBLK
EQBLK
Sampling Event
June 2019
August 2019
August 2019
August 2019
Field Sample ID
STW-EQBLK-2
STW-EB-01-082119
STW-EB-02-082119
STW-EB-03-082119
Date Sampled
06/27/2019
8/21/2019
8/21/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<2
<2
<2
PFMOAA
<5
<5
<5
<5
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
<10
<10
<10
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
--
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<2
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
--
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 59 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EQBLK
EQBLK
EQBLK
EQBLK
Sampling Event
October 2019
October 2019
October 2019
December 2019
Field Sample ID
STW-EB-01-100919
STW-EB-02-100919
STW-EB-03-100919
STW-EQBLK-DR-
122019
Date Sampled
10/9/2019
10/9/2019
10/9/2019
12/20/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<4
<4
<4
PFMOAA
<5
<5
<5
<5
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
<10
<10
10
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
10
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
10
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 60 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EQBLK
EQBLK
EQBLK
EQBLK
Sampling Event
December 2019
January 2020
January 2020
April 2020
Field Sample ID
STW-EQBLK-IO-122019
STW-LOCEB1-012920
STW-LOCEB2-012920
STW-LOC-EB1-042820
Date Sampled
12/20/2019
1/29/2020
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<4
<4
<4
PFMOAA
<5
<5 UJ
<5 UJ
<5
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
10
<10
<10
<10
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
10
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
10
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 61 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EQBLK
EQBLK
EB
EB
Sampling Event
April 2020
May/June 2020
August 2020
August 2020
Field Sample ID
STW-LOC-EB2-042820
STW-EB-052120
STW-EQBLK-DR-
082620
STW-EQBLK-IS-082620
Date Sampled
4/28/2020
5/20/2020
8/26/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Equipment Blank
Equipment Blank
Equipment Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<2
<4
<4
PFMOAA
<5
<5
<2
<2
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
<10
<20
<20
PEPA
<20
<20
<10
<10
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
--
--
--
DONA
--
<2
<2
<2
NaDONA
<2.1
--
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
--
--
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 62 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
EB
FBLK
FBLK
FBLK
Sampling Event
August 2020
April 2019
June 2019
August 2019
Field Sample ID
STW-EQBLK-PP-082620
DSTW-TB-042519
STW-LOC-FBLK-1
STW-FB-082119
Date Sampled
8/26/2020
04/25/2019
06/27/2019
8/21/2019
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Equipment Blank
Field Blank
Field Blank
Field Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<4.0
<4
<2
PFMOAA
<2
<5 UJ
<5
<5
PFO2HxA
<2
<2 UJ
<2
<2
PFO3OA
<2
<2 UJ
<2
<2
PFO4DA
<2
<2 UJ
<2
<2
PFO5DA
<2
<2 UJ
<2
<2
PMPA
<20
<10 UJ
<10
<10
PEPA
<10
<20 UJ
<20
<20
PS Acid
<2
<2 UJ
<2
<2
Hydro -PS Acid
<2
<2 UJ
<2
<2
R-PSDA
<2
<2 UJ
<2
<2
Hydrolyzed PSDA
<2
<2 UJ
<2
<2
R-PSDCA
<2
<2 UJ
<2
<2
NVHOS
<2
<2 UJ
<2
<2
EVE Acid
<2
<2 UJ
<2
<2
Hydro -EVE Acid
<2
<2 UJ
<2
<2
R-EVE
<2
<2 UJ
<2
<2
PES
<2
<2 UJ
<2
<2
PFECA B
<2
<2 UJ
<2
<2
PFECA-G
<2
<2 UJ
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
--
--
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<60
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<110
<2
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
--
--
<2
ADONA
--
<2.1
<2.1
<2.1
DONA
<2
--
--
--
NaDONA
--
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<37
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<35
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
--
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 63 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table C1
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
FBLK
FBLK
FBLK
FBLK
Sampling Event
October 2019
December 2019
Jannuary 2020
April 2020
Field Sample ID
STW-FB-100919
STW-FBLK-122019
STW-LOCFB-012920
STW-LOC-FB-042820
Date Sampled
10/9/2019
12/20/2019
1/29/2020
4/28/2020
Analytical Laboratory
TestAmerica
TestAmerica
TestAmerica
TestAmerica
QA/QC
Field Blank
Field Blank
Field Blank
Field Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<4
<4 UJ
<4
<4
PFMOAA
<5
<5
<5 UJ
<5
PFO2HxA
<2
<2
<2
<2
PFO3OA
<2
<2
<2
<2
PFO4DA
<2
<2
<2
<2
PFO5DA
<2
<2
<2
<2
PMPA
<10
10
<10
<10
PEPA
<20
<20
<20
<20
PS Acid
<2
<2
<2
<2
Hydro -PS Acid
<2
<2
<2
<2
R-PSDA
<2
<2
<2
<2
Hydrolyzed PSDA
<2
<2
<2
<2
R-PSDCA
<2
<2
<2
<2
NVHOS
<2
<2
<2
<2
EVE Acid
<2
<2
<2
<2
Hydro -EVE Acid
<2
<2
<2
<2
R-EVE
<2
<2
<2
<2
PES
<2
<2
<2
<2
PFECA B
<2
<2
<2
<2
PFECA-G
<2
<2
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
10
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
10
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
<2
<2
ADONA
<2.1
<2.1
<2.1
<2.1
DONA
--
--
--
--
NaDONA
<2.1
<2.1
<2.1
<2.1
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
<2
<2
Perfluorobutanoic Acid
<2
<2 UJ
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
<2
<2
Perfluorodecanoic Acid
<2
<2
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
<2
<2
Perfluorododecanoic Acid
<2
<2
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
<2
<2
Perfluoroheptanoic Acid
<2
<2 UJ
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
<2
<2
<2
Perfluorohexane Sulfonic Acid
<2
<2
<2
<2
Perfluorohexanoic Acid
<2
<2 UJ
<2
<2
Perfluorononanesulfonic acid
<2
<2
<2
<2
Perfluorononanoic Acid
<2
<2
<2
<2
Perfluorooctadecanoic acid
<2
<2
<2
<2
Perfluorooctane Sulfonamide
<2
<2
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
<2
<2
Perfluoropentanoic Acid
<2
<2 UJ
<2
<2
Perfluorotetradecanoic Acid
<2
<2
<2
<2
Perfluorotridecanoic Acid
<2
<2
<2
<2
Perfluoroundecanoic Acid
<2
<2
<2
<2
PFOA
<2
<2 UJ
<2
<2
PFOS
<2
<2
<2
<2
TR0795A Page 64 of 65 December 2020

DocuSign Envelope ID: 3296F1CC-8476-4A30-97CB-604DAA2E6672
Table Cl
ANALYTICAL RESULTS - ALL SAMPLING EVENTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, P.C.
Location ID
FBLK
FBLK
Sampling Event
May/June 2020
August 2020
Field Sample ID
STW-FB-052120
STW-FBLK-082620
Date Sampled
5/20/2020
8/26/2020
Analytical Laboratory
TestAmerica
TestAmerica
QA/QC
Field Blank
Field Blank
Table 3+ Lab SOP (ng/L)
HFPO-DA (EPA Method 537 Mod)
<2
<4
PFMOAA
<5
<2
PFO2HxA
<2
<2
PFO3OA
<2
<2
PFO4DA
<2
<2
PFO5DA
<2
<2
PMPA
<10
<20
PEPA
<20
<10
PS Acid
<2
<2
Hydro -PS Acid
<2
<2
R-PSDA
<2
<2
Hydrolyzed PSDA
<2
<2
R-PSDCA
<2
<2
NVHOS
<2
<2
EVE Acid
<2
<2
Hydro -EVE Acid
<2
<2
R-EVE
<2
<2
PES
<2
<2
PFECA B
<2
<2
PFECA-G
<2
<2
Total Table 3+ Compounds (17 compounds)*
ND
ND
Total Table 3+ Compounds (20 compounds)*
ND
ND
Other PFAS (ng/L)
10:2 Fluorotelomer sulfonate
<2
<2
F-53B Minor (11C1-PF3OUdS)
<2
<2
1H,1H,2H,2H-perfluorodecanesulfonate (8:2 FTS)
<20
<20
1H,1H,2H,2H-perfluorohexanesulfonate (4:2 FTS)
<20
<20
2-(N-ethyl perfluoro-l-octanesulfonamido)-ethanol
<2
<2
2-(N-methyl perfluoro-l-octanesulfonamido)-ethanol
<4
<4
6:2 Fluorotelomer sulfonate
<20
<20
F-53B Major (9C1-PF3ONS)
<2
<2
ADONA
--
--
DONA
<2
<2
NaDONA
--
--
N-ethyl perfluorooctane sulfonamidoacetic acid
<20
<20
N-ethylperfluoro- l-octanesulfonamide
<2
<2
N-methyl perfluoro-l-octanesulfonamide
<2
<2
N-methyl perfluorooctane sulfonamidoacetic acid
<20
<20
Perfluorobutane Sulfonic Acid
<2
<2
Perfluorobutanoic Acid
<2
<2
Perfluorodecane Sulfonic Acid
<2
<2
Perfluorodecanoic Acid
<2
<2
Perfluorododecane sulfonic acid (PFDoS)
<2
<2
Perfluorododecanoic Acid
<2
<2
Perfluoroheptane sulfonic acid (PFHpS)
<2
<2
Perfluoroheptanoic Acid
<2
<2
Perfluorohexadecanoic acid (PFHxDA)
<2
--
Perfluorohexane Sulfonic Acid
<2
<2
Perfluorohexanoic Acid
<2
<2
Perfluorononanesulfonic acid
<2
<2
Perfluorononanoic Acid
<2
<2
Perfluorooctadecanoic acid
<2
<2
Perfluorooctane Sulfonamide
<2
<2
Perfluoropentane sulfonic acid (PFPeS)
<2
<2
Perfluoropentanoic Acid
<2
<2
Perfluorotetradecanoic Acid
<2
<2
Perfluorotridecanoic Acid
<2
<2
Perfluoroundecanoic Acid
<2
<2
PFOA
<2
<2
PFOS
<2
<2
Notes:
* - Total Table 3+ was calculated including J qualified data but not non -detect data. The total Table 3+
sum is rounded to two significant figures.
Samples collected in May 2020 and June 2020 are considered one sampling event, the May/June 2020
event. Locations containing stormwater were collected in May 2020 during a storm event. Locations that
had no influence from stormwater were collected in June 2020.
Locations sampled in May 2020 were collected on May 20, 2020, and sample bottles were retrieved on
May 21, 2020. Locations sampled in June 2020 were collected on June 3, 2020, and some sample bottles
were retrieved on June 5, 2020.
Total Table 3+ (17 compounds) excludes Hydrolyzed PSDA, R-PSDA and R-EVE because these 3
compounds are not considered accurate due to significant matrix interference issues. All detected
concentrations for these 3 compounds have been retrospectively J-qualified.
Bold - Analyte detected above associated reporting limit
EPA - Environmental Protection Agency
B - Not detected substantially above the level reported in the laboratory or field blanks.
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
R - Reject. The presence or absence of the analyte cannot be verified.
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.
TR0795A Page 65 of 65 December 2020