2021.03.31_CCOA.p1_Q4_2020MassLoadAssessment

CAPE FEAR RIVER PFAS MASS
LOADING ASSESSMENT - FOURTH
QUARTER 2020 REPORT
Chemours Fayetteville Works

Prepared for
The Chemours Company FC, LLC
22828 NC Highway 87 Fayetteville, NC 28306
Prepared by
Geosyntec Consultants of NC, PC 2501 Blue Ridge Road, Suite 430
Raleigh, NC 27607
Project Number TR0795A
March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
3/31/2021

TR0795A i March 2021
TABLE OF CONTENTS
1 INTRODUCTION AND OBJECTIVES .............................................................. 1
2 SCOPE .................................................................................................................. 2
2.1 Sampling Activities in Q4 2020 .................................................................. 2
2.2 Cape Fear River PFAS Mass Load Sampling Program ............................... 3
2.3 Cape Fear River PFAS Mass Loading Model Sampling Program .............. 4
2.4 Laboratory Analyses .................................................................................... 4
2.5 Total Attachment C PFAS ........................................................................... 5
3 SAMPLING RESULTS........................................................................................ 5
3.1 Data Quality ................................................................................................. 5
3.1.1 Table 3+ 17 Compounds ................................................................. 6
3.2 Cape Fear River PFAS Mass Load Sampling Results ................................. 7
3.2.1 Cape Fear River Mass Load QA/QC Samples ................................ 7
3.2.2 Cape Fear River Mass Load PFAS Analytical Results ................... 7
3.3 PFAS Mass Loading Model Sampling Seep and Surface Water Results .... 7
3.3.1 Seep and Surface Water QA/QC Samples ...................................... 8
3.3.2 Seeps and Surface Flow Gauging ................................................... 8
3.3.3 Seeps and Surface Water Field Parameters ..................................... 8
3.3.4 Seep and Surface Water PFAS Analytical Results ......................... 8
3.4 PFAS Mass Loading Model Sampling Groundwater Results ..................... 9
3.4.1 Groundwater QA/QC Samples ........................................................ 9
3.4.2 Water Levels ................................................................................. 10
3.4.3 Groundwater Field Parameters ...................................................... 10
3.4.4 Groundwater PFAS Analytical Results ......................................... 10
4 PFAS MASS LOAD TO CAPE FEAR RIVER ................................................. 11
4.1 Total PFAS Mass Load.............................................................................. 12
4.2 Mass Discharge at Bladen Bluffs, Tar Heel Ferry Road Bridge and Kings Bluff Intake Canal ............................................................................................... 14
5 CAPE FEAR RIVER PFAS MASS LOADING MODEL ................................. 14
5.1 PFAS Mass Loading Model Pathways ...................................................... 15
5.2 Model Design ............................................................................................ 16
5.2.1 Adjustments to Mass Loading Model Calculations ...................... 17
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A ii March 2021
5.3 Mass Loading Model Results .................................................................... 17
5.3.1 Before Remedies Relative Contributions by Pathway .................. 18
5.4 Mass Loading Model Sensitivity and Limitations ..................................... 20
5.4.1 Upper and Lower Bounds ............................................................. 20
5.4.2 River Flows and Precipitation ....................................................... 21
5.5 Modeled Versus Measured Mass Discharges ............................................ 21
6 SUMMARY ........................................................................................................ 21
7 REFERENCES ................................................................................................... 24

LIST OF TABLES
Table 1: PFAS Analyte List
Table 2: Surface Water Sample Collection and Flow Measurement Summary
Table 3: Groundwater Monitoring Well Sample Collection and Water Level
Measurement Summary
Table 4: Groundwater Elevations – February 2020
Table 5: Seep and Surface Water Field Parameters
Table 6: Groundwater Field Parameters
Table 7: Cape Fear River Mass Load Analytical Results
Table 8: Seep and Surface Water Analytical Results
Table 9: Flow Summary for Surface and River Water Locations
Table 10: Groundwater Analytical Results
Table 11: Summary of Calculated Total Mass Load in the Cape Fear River
Table 12A: Cape Fear River PFAS Mass Load by Compound and Time Interval
Table 12B: Old Outfall 002 Captured PFAS Mass Load by Compound and Time Interval
Table 12C: Seep C Flow Through Cell Captured Mass Load by Compound and Time Interval
Table 13: Summary of Total PFAS Mass Discharge at Tar Heel Ferry Road Bridge
Table 14: PFAS Mass Loading Model Potential Pathways
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A iii March 2021
Table 15A: Estimated 2020 Quarter 4 Event Table 3+ PFAS Mass Discharge by
Pathway Before Remedies
Table 15B: Estimated 2020 Quarter 4 Event Table 3+ PFAS Mass Discharge by Pathway After Remedies
Table 16A: Summary of Total PFAS Mass Discharge by Pathway Before Remedies
Table 16B: Summary of Total PFAS Mass Discharge by Pathway After Remedies
Table 17: Cape Fear River Total PFAS Relative Mass Discharge Per Pathway

LIST OF FIGURES
Figure 1: Site Location Map
Figure 2: Cape Fear River Watershed and Downstream Drinking Water Intakes
Figure 3: Potential PFAS Transport Pathways to the Cape Fear River from Site
Figure 4: Sample and Flow Measurement Locations – December 2020
Figure 5: Cape Fear River Sample Locations – December 2020
Figure 6 Groundwater Wells for Mass Loading Assessment
Figure 7A: Groundwater Elevation Map Perched Zone - December 2020
Figure 7B: Groundwater Elevation Map Surficial Aquifer – December 2020
Figure 7C: Groundwater Elevation Map Black Creek Aquifer – December 2020
Figure 8: Total Table 3+ Concentrations (17 Compounds) Concentrations, Daily Precipitation and Flow at Tar Heel Ferry Road Bridge
Figure 9: Total Table 3+ Concentrations (17 Compounds) Mass Discharge, Daily
Precipitation and Flow at Tar Heel Ferry Road Bridge
Figure 10: Total Table 3+ Concentrations (17 Compounds) in Surface Water – December 2020
Figure 11: Cape Fear River Total Table 3+ Concentrations (17 Compounds) –
December 2020
Figure 12: Cape Fear River HFPO-DA Concentrations – December 2020
Figure 13: Total Table 3+ Concentrations in Groundwater (17 Compounds) – December 2020
Figure 14: Comparison of Modelled and Measured Total Table 3+ Mass Loading at
Tar Heel Ferry Road Bridge

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A iv March 2021
LIST OF APPENDICES
Appendix A: Field Methods
Appendix B: Cape Fear River Mass Loading Calculations
Appendix C: Supplemental Analytical Tables
Appendix D: Supplemental Flow Data
Appendix E: Field Forms
Appendix F: Laboratory Reports and DVM Report
Appendix G: Supporting Calculations – Onsite Groundwater Pathway
Appendix H: Supporting Calculations – Direct Aerial Deposition on Cape Fear River
Appendix I: Supporting Calculations – Offsite and Adjacent Downstream
Groundwater
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A v March 2021
LIST OF ABBREVIATIONS
CAP Corrective Action Plan
cfs cubic feet per second
CFR-TARHEEL Cape Fear River at Tar Heel Ferry Road Bridge
CO Consent Order
CO Addendum Addendum to Consent Order Paragraph 12
DQO Data Quality Objectives
DVM Data Verification Module
EIM Environmental Information Management
gpm gallons per minute
HFPO-DA hexafluoropropylene oxide dimer acid
kg kilograms
L/s liters per second
L3T-1 volume per time
m3 million cubic meters
mg/s milligrams per second
ML-3 mass per unit volume
MT-1 mass per unit time
ng/L nanograms per liter
NCDEQ North Carolina Department of Environmental Quality
PFAS per- and polyfluoroalkyl substances
PFHpA perfluoroheptanoic acid
PFMOAA perfluoro-2-methoxyaceticacid
PMPA perfluoromethoxypropyl carboxylic acid
QA/QC quality assurance/quality control
Q1 2020 first quarter 2020
Q2 2020 second quarter 2020
Q3 2020 third quarter 2020
Q4 2020 fourth quarter 2020
RPD relative percent difference
SOP standard operating procedure
USGS United States Geological Survey
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 1 March 2021
1 INTRODUCTION AND OBJECTIVES
Geosyntec Consultants of NC, P.C. (Geosyntec) has prepared this Cape Fear River PFAS
Mass Loading Assessment report for The Chemours Company, FC, LLC (Chemours).
Chemours operates the Fayetteville Works facility in Bladen County, North Carolina (the
Site). This report provides monitoring and assessment results pursuant to the
requirements of Paragraphs 1(a) and 1(b) of the Addendum to Consent Order Paragraph
12 (CO Addendum) and Paragraph 16 of the executed Consent Order (CO) dated 25
February 2019 among the North Carolina Department of Environmental Quality
(NCDEQ), Cape Fear River Watch, and Chemours.
The purpose of this report is to describe the fourth quarter 2020 (Q4 2020) PFAS Mass
Loading Assessment of the Cape Fear River based on the findings of surface water, river
water, and groundwater samples collected at and surrounding the Site. Data collected
were used to assess mass loading of total per- and polyfluoroalkyl substances (PFAS) to
the Cape Fear River. Total PFAS is a term used to refer to PFAS detected in the
environment for those PFAS compounds listed in Table 1 and analyzed by the Table 3+
standard operating procedure (SOP) analytical method.
There are two primary objectives for this report:
1. To assess Cape Fear River PFAS mass loads. Specifically:
a. Mass loads measured in the Cape Fear River;
b. Mass loads prevented from reaching the Cape Fear River by implemented
remedies; and
c. The total mass load that was heading to the Cape Fear River, i.e., the sum
of the two quantities above.
2. To assess the relative PFAS loadings from the different PFAS transport pathways
to the Cape Fear River during the reporting period1 using the Mass Loading
Model.
The CO Addendum requires sampling the Cape Fear River for PFAS compounds listed
in Attachment C of the CO (Cape Fear River Mass Loading Calculation Protocol Version
2, Geosyntec 2020d). Accordingly, this report contains data through December 2020, and

1 Starting in December 2020, Chemours commenced monthly sampling of the mass loading model pathways as per CO Paragraph 1(b) and the associated protocol document Cape Fear River Mass Loading Calculation Protocol Version 2 (Geosyntec 2020d). Monthly sampling of these pathways will be conducted for one year and thereafter on a quarterly basis for the next four years.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 2 March 2021
mass loading calculations and reporting are done on the set of PFAS compounds listed in
Table 1, i.e., both “Table 3+” and “Attachment C”.
The remainder of this report is organized as follows:
• Scope – This section describes the sampling programs performed in Q4 2020;
• Sampling Results – This section describes the results of the sampling activities;
• PFAS Mass Load to Cape Fear River – This section describes the assessments
of Cape Fear River PFAS Mass Loads;
• Cape Fear River PFAS Mass Loading Model – This section describes the
assessment of the relative mass loading from the various PFAS transport
pathways;
• Summary – This section summarizes the findings of this report.
2 SCOPE
The Q4 2020 sampling was completed by Geosyntec and Parsons of NC (Parsons) from
October to December 2020. The scope of the sampling programs is summarized below,
and complete descriptions of the field methods can be found in Appendix A.
2.1 Sampling Activities in Q4 2020
Q4 2020 sampling activities included:
1. The Cape Fear River PFAS Mass Load Sampling Program consisted of collecting
twice weekly composite samples at Cape Fear River at Tar Heel Ferry Road
Bridge (CFR-TARHEEL) (October 2020 to December 2020); and
2. The Cape Fear River PFAS Mass Loading Model Sampling Program event which
consisted of the following:
a. Collecting a synoptic round of groundwater elevations from select on and
offsite monitoring wells (December 2020);
b. Collecting water samples for PFAS from 19 onsite and offsite monitoring
wells (December 2020)2;
c. Collecting seep, surface water, and river water samples for PFAS
(December 2020); and

2 Bladen-1D (damaged) and PW-11 (being pumped as part of the Pre-design Investigation activities) could not be sampled in December 2020.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 3 March 2021
d. Measuring flow rates at specified seep and surface water locations
(December 2020).
Each program is described in further detail below.
2.2 Cape Fear River PFAS Mass Load Sampling Program
The Cape Fear River PFAS Mass Load program consists of collecting twice weekly
composite samples from the sampling location at CFR-TARHEEL, approximately 7
miles downstream of the Site (Figure 2). This location is far enough downstream of the
Site such that water from the seeps, onsite groundwater, Old Outfall 002 and Georgia
Branch Creek are well mixed in the river.
Composite samples were collected using an autosampler and were generally composited
over 24 hours with aliquots collected at one-hour intervals yielding seven samples per
week. Two samples per week were selected based on sample completeness and sent for
analysis. Collected samples were evaluated for the PFAS compounds listed in Table 1.
Details on sample collection methods are described in Appendix A.
Interruptions to the sampling program may occur due to events such as vandalism,
equipment malfunction or a high river stage, which will flood the platform and
necessitates sampler removal. During interruptions, field protocol is to collect a grab
sample from the river twice per week at the CFR-TARHEEL location to continue
establishing a record of river concentrations over time. During the reporting period
between October 1, 2020 and December 31, 2020, two interruptions occurred in the
scheduled sampling program:
• November 13, 2020 to November 20, 2020 – High river stage was experienced at
the sampling location between these dates necessitating the removal of the
autosampler to prevent damage. Instead, three grab sampling events were
conducted on November 13, 18, and 20, 2020.
• December 14, 2020 to December 30, 2020 – High river stage was experienced at
the sampling location between these dates necessitating the removal of the
autosampler to prevent damage. Instead, seven grab sampling events were
conducted on December 15, 17, 21, 23, 24, 28 and 30, 2020.
The data collected from the PFAS Mass Load Sampling Program were used to estimate
PFAS mass load in the Cape Fear River using concentrations from the CFR-TARHEEL
location and flows as reported by the United States Geological Survey (USGS) river
gauging station at the W.O. Huske Dam (Figure 2). Details of the calculation methods
were reported in the Cape Fear River PFAS Mass Loading Calculation Protocol Version
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 4 March 2021
2 (Geosyntec, 2020d) and are provided in Appendix B. Results of these sampling
activities are described below in Sections 3 and Section 4.
2.3 Cape Fear River PFAS Mass Loading Model Sampling Program
The quarterly Mass Loading Model Sampling Program consisted of collecting
concentration and flow data from the various PFAS transport pathways in December
2020. Environmental media sampled include surface water (seeps, creeks, Old Outfall,
Outfall 002, and Cape Fear River) and groundwater. Surface and river water sampling
and flow gauging locations for the Q4 2020 Event are shown on Figures 4 and 5 and listed
in Table 2. Groundwater sampling locations for the Q4 2020 Event are listed in Table 3
and shown on Figure 6. Collected samples were evaluated for the PFAS compounds listed
in Table 1. Details on sample collection and flow gauging methods are described in
Appendix A.
The data collected from these Q4 2020 field activities were then incorporated into the
Mass Loading Model to estimate PFAS mass discharge from the nine potential transport
pathways to the Cape Fear River (Figure 3), as identified in the Conceptual Site Model
(Geosyntec, 2019b) and discussed in more detail in Section 5. These Mass Loading Model
estimates were compared to mass loading observed downstream at CFR-TARHEEL.
Grab samples were also collected from the Cape Fear River adjacent to the Bladen Bluffs
and Kings Bluff Intakes at CFR-BLADEN and CFR-KINGS, respectively (Figure 2).
Samples were analyzed for PFAS listed in Table 1. To calculate the mass discharge at
these sample locations, flows as reported by the USGS river gauging station at the W.O.
Huske Dam and Cape Fear River Lock & Dam #1 were used to determine river flow
volumes corresponding to samples collected at CFR-BLADEN and CFR-KINGS,
respectively. PFAS concentrations and mass discharge calculations are reported in
Section 4.3.
2.4 Laboratory Analyses
Samples were analyzed for PFAS by Table 3+ Laboratory SOP and some samples were
analyzed for Method EPA 537 Modified. The focus of this report is on the set of PFAS
originating from manufacturing activities at the Site; therefore, results of sampling
activities and assessments of mass loading were performed and presented with respect to
the PFAS groupings presented in Table 1: (i) Attachment C, (ii) Table 3+ (17
compounds), and (iii) Table 3+ (20 compounds). Analytical results of other PFAS, i.e.,
those analyzed under Method EPA 537 Modified, with the exception of
hexafluoropropylene oxide dimer acid (HFPO-DA), are provided in Appendix C.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 5 March 2021
2.5 Total Attachment C PFAS
In this report, the calculations for Total Attachment C PFAS concentrations include all
fluoroether PFAS on the Attachment C list, i.e. the Table 3+ PFAS component of
Attachment C. Fluoroether monomers and polymers are the primary product
manufactured at the facility. The compound perfluoroheptanoic acid (PFHpA) which is
present in industrial uses such as stain resistant coatings and food packaging (PubChem,
2020), is not a fluoroether and is not included in Attachment C sums.
Geosyntec conducted an assessment to evaluate the inclusion of PFHpA in the summation
of Total Attachment C PFAS concentrations used in Mass Loading Assessments of the
Cape Fear River (presented in Cape Fear River PFAS Mass Loading Assessment – Third
Quarter 2020 Report; Geosyntec, 2020e). Based on the results of the assessment, it was
concluded that PFHpA should be excluded from the Total Attachment C concentrations
for Mass Loading Assessments of the Cape Fear River because of the following:
• PFHpA is widespread beyond the extent of the Site from non-Chemours sources;
• The presence of PFHpA upstream and offsite are unrelated to the Site; and
• The downstream PFHpA concentrations mirror upstream concentrations
indicating the Site does not measurably influence the downstream values.
This represents a modification to the Cape Fear River PFAS Mass Loading Calculation
Protocol Version 2 submitted to NCDEQ on November 18, 2020 (Geosyntec, 2020d).
3 SAMPLING RESULTS
This section presents sampling results from Q4 2020 sampling activities described in
Section 2. Specifically, this section describes data quality presented in this report and then
describes the results from the Cape Fear River PFAS Mass Load sampling program and
the Cape Fear River PFAS Mass Loading Model sampling programs.
3.1 Data Quality
All analytical data were reviewed using the Data Verification Module (DVM) within the
Locus™ 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
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 6 March 2021
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;
• UJ Analyte not present above 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 event. 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.
3.1.1 Table 3+ 17 Compounds
For clarity, the text and figures of this report describe the Total Table 3+ (17 compounds)
while Total Table 3+ (20 compounds) are included in the tables.
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
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 7 March 2021
three compounds (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 are calculated and
presented two ways in this report: (i) summing over 17 of the 20 Table 3+ compounds
“Total Table 3+ (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+ (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.
3.2 Cape Fear River PFAS Mass Load Sampling Results
For this Q4 2020 report, the Cape Fear River Mass Load reporting period was from
October 1 to December 31, 2020. During this period, twenty-two (22) primary composite
samples and eleven (11) grab samples were collected at location CFR-TARHEEL, with
the last sample being collected on December 30, 2020.
3.2.1 Cape Fear River Mass Load QA/QC Samples
There were no quality assurance/quality control (QA/QC) samples collected at CFR-
TARHEEL during Q4 2020.
3.2.2 Cape Fear River Mass Load PFAS Analytical Results
Analytical sample results used to estimate Cape Fear River mass loads are reported in
Table 7. In Q4 2020, Total Table 3+ concentrations ranged from 5.5 nanograms per liter
(ng/L) (CFR-TARHEEL-122820) to 240 ng/L (CFR-TARHEEL-20-111220). This range
in concentrations is within the observed range in previous quarterly sampling events.
The concentrations over time for these samples are plotted on Figure 8 and corresponding
calculated mass loads are reported in Tables 11 and 12 and plotted in Figure 9. Both
figures are described in Section 4.
3.3 PFAS Mass Loading Model Sampling Seep and Surface Water Results
For this Q4 2020 report, sampling of seep, surface water and Cape Fear River locations
occurred between December 15 and 16, 2020. During this period, eight (8) composite
samples, seven (7) grab samples, and one duplicate sample were collected.
USGS rain gauge 02105500 indicated 1 inch of precipitation during the week of surface
water sample collection (December 14 to 16, 2020). The December 2020 surface water
sampling event is, therefore, considered to be a wet weather event.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 8 March 2021
3.3.1 Seep and Surface Water QA/QC Samples
PFAS concentrations for surface water QA/QC samples are reported in Table 8. Four
equipment blanks (December 15 to 16, 2020) and two field blank (December 15 to 16,
2020) were collected and none of the PFAS were detected above the associated reporting
limits. One field duplicate was collected at the Intake River Water at Facility location on
December 16, 2020. PFAS results for the parent (RIVER-WATER-INTAKE-24-121620)
and the duplicate sample (RIVER-WATER-INTAKE-24-121620-D) had relative percent
differences less than 30% for the reported compounds; except Hydrolyzed-PSDA,
NVHOS and R-EVE, which were J-qualified.
3.3.2 Seeps and Surface Flow Gauging
A summary of flow rates measured for the December 2020 seep and surface water event
is presented in Table 9. Details on estimated flow measurements along with measurement
methods at each flow gauging location are included in Appendix D.
Measured flow rates for Willis Creek and Georgia Branch Creek in December 2020 were
10,600 and 6,200 gallons per minute (gpm). Measured flow rates at the seeps were 93,
134, 27, 124, and 16 gpm for Seeps A though D and Lock and Dam Seep, respectively.
The flow rate at Outfall 002 was 12,000 gpm while Old Outfall 002 had a flow rate of
431 gpm. The USGS reported flow at W.O. Huske Dam (USGS 02105500) of 2,750,000
gpm and 4,000,000 on December 15 and 16, 2020, respectively. The USGS reported
flow at Kings Bluff (USGS 02105769) was 3,435,000 gpm on December 16, 2020.
3.3.3 Seeps and Surface Water Field Parameters
Field parameters recorded for surface water samples collected during the Q4 2020 event
are presented in Table 5 and the field forms are provided in Appendix E. Recorded field
parameter data are generally consistent with expectations.
3.3.4 Seep and Surface Water PFAS Analytical Results
Analytical results for the seep, surface, and river water samples are summarized in Table
8. Figures 10 and 11 show the Total Table 3+ concentrations reported for samples
collected in December 2020 and Figure 12 presents the HFPO-DA concentrations for
Cape Fear River samples, respectively. Laboratory and DVM reports are included in
Appendix F.
In general, Total Table 3+ concentrations were lowest at Intake at the Facility, Outfall
002 and in the upstream and downstream river samples and the highest at the seeps
(Figures 10 and 11; Table 8). Among the river samples, Total Table 3+ concentrations
ranged from 6.3 ng/L (CFR-MILE-76; before site) to 79 ng/L (downstream sample at
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 9 March 2021
CFR-KINGS). Among the creeks, Total Table 3+ concentrations were higher at Georgia
Branch Creek (1,500 ng/L) than at Willis Creek (1,300 ng/L). Among the seeps and Old
Outfall 002, Old Outfall 002 had the lowest Total Table 3+ concentrations (2,200 ng/L),
which was an order of magnitude lower than previous event, while Seep C had the highest
Total Table 3+ concentrations (420,000 ng/L).
Figure 12 shows the HFPO-DA concentrations in the four river samples. HFPO-DA
concentrations were well below 140 ng/L ranging from <2 ng/L (upstream at CFR-MILE-
76) to 11 ng/L (downstream sample at CFR-TARHEEL on December 16, 2020).
3.4 PFAS Mass Loading Model Sampling Groundwater Results
A synoptic water level survey of the onsite groundwater monitoring well network was
completed on December 7, 2020, with the exception of two offsite groundwater wells
(BLADEN-3S and BLAD-3D), which were measured on December 8, 2020. Field
parameters and groundwater samples were collected from 18 of the 20 CO Paragraph 16
wells between December 8, 2020 and December 22, 2020. This list of groundwater wells
is derived from the Corrective Action Plan (CAP) (Geosyntec, 2019c) with the exception
of wells INSITU-02 and BLADEN-1S, which were removed as these wells are
perennially dry. The two wells that could not be sampled in December 2020 were Bladen-
1D which was damaged and PW-11 which was being pumped as part of the Pre-design
Investigation activities.
3.4.1 Groundwater QA/QC Samples
PFAS concentrations for groundwater QA/QC samples are reported in Table 10. The
following observations were noted for the QA/QC samples:
• Six equipment blank samples were collected over the 5 sampling days. No PFAS
were detected above the associated reporting limits in all of the equipment blank
samples.
• Five field blank samples were collected over the 5 sampling days where these
groundwater wells were sampled. No PFAS were detected above the associated
reporting limits in all of the field blank samples.
• One field duplicate sample was collected at PIW-7S. PFAS results for the parent
(CAP1220-PIW-7S-120820) and duplicate sample (CAP1220-PIW-7S-120820-
D) had relative percent differences less than 30% for the reported compounds.

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 10 March 2021
3.4.2 Water Levels
Groundwater elevations were calculated for onsite and offsite wells screened in the
Perched Zone, Surficial Aquifer and Black Creek Aquifer from a single synoptic water
level measurement survey performed on December 7 and 8, 2020 (Table 4). Groundwater
elevations from these synoptic water levels were used to develop potentiometric maps for
the Perched Zone, Surficial Aquifer and Black Creek Aquifer (Figures 7A, 7B, and 7C).
Similar to Perched Zone groundwater elevations discussed in previous assessments
(Geosyntec, 2019b; Geosyntec, 2020b; Geosyntec, 2020c; Geosyntec, 2020e),
groundwater elevations were highest in the central portion of the Perched Zone near the
Power and Monomers IXM area of the Site (Figure 7A). Perched Zone groundwater
elevations appear to be controlled by topography and the lateral extent of the clay lens.
Groundwater elevations in Surficial Aquifer wells (Figure 7B) indicate groundwater flow
in the northern portion of the Site is likely to be east-northeast towards both Willis Creek
and Cape Fear River, and at the southern end of the Site towards Old Outfall 002,
consistent with the flow observed in in previous assessments (Geosyntec, 2019b;
Geosyntec, 2020b; Geosyntec, 2020c; Geosyntec, 2020e). In the southern portion of the
Site the Surficial Aquifer groundwater discharges to the Old Outfall 002 and to Seep B.
Groundwater in the Black Creek Aquifer flows in a predominantly easterly direction to
the Cape Fear River (Figure 7C) similar to groundwater elevations discussed in previous
assessments (Geosyntec, 2019b; Geosyntec, 2020b; Geosyntec, 2020c; Geosyntec,
2020e). A portion of Black Creek Aquifer groundwater flow is interpreted to also flow to
the northeast, towards Willis Creek (near SMW-12) and southeast, towards Old Outfall
(east of PW-11 or Glengerry Road). The contours drawn from the groundwater elevations
were used to estimate hydraulic gradients in the Black Creek Aquifer. The hydraulic
gradients were used as an input into the Mass Loading Model to estimate the contribution
of onsite groundwater in the Black Creek Aquifer to the PFAS mass loading to the Cape
Fear River. The details of the calculations can be found in Appendix G.
3.4.3 Groundwater Field Parameters
Field parameters recorded for groundwater samples collected during the Q4 2020 event
are presented in Table 6 and the field forms are provided in Appendix E. Recorded field
parameter data are generally in line with expectations for the sample locations.
3.4.4 Groundwater PFAS Analytical Results
PFAS and Total PFAS concentrations for the groundwater samples collected in December
2020 are summarized in Table 10 and Figure 13. Laboratory and DVM reports are
included in Appendix F. Total Table 3+ concentrations ranged from non-detect (PW-09)
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 11 March 2021
to 250,000 ng/L (LTW-03) with the highest concentrations observed in the LTW wells
near the mouths of the seeps adjacent to the river (Figures 13).
In general, the largest proportion of Total Table 3+ concentrations are comprised of
HFPO-DA, PFMOAA, and perfluoromethoxypropyl carboxylic acid (PMPA) (Table 10).
On an aquifer basis, lower individual and Total Table 3+ concentrations are observed in
wells screened in the Surficial Aquifer. Concentrations of Total Table 3+ in Floodplain
Deposits and Black Creek Aquifer groundwater (Figures 13) were similar to the seep
concentrations (Figures 10). Overall, results from the Q4 2020 monitoring are consistent
with trends observed at these wells in previous monitoring events (Geosyntec, 2019b;
Geosyntec, 2020b; Geosyntec, 2020c; Geosyntec, 2020e), with the exception of LTW-
04, PIW-7S, and PIW-7D, which had lower than normal concentrations. These low
concentrations may be associated with the high river levels that occurred between
November 13 to November 30, 2020. On November 16, 2020, the Cape Fear River
elevation reached 53 feet above mean sea level (NAVD88), while the ground surface
elevation of LTW-04, PIW-7S and PIW-7D are 49.34, 46.07 and 45.70 feet above mean
sea level (NAVD88), respectively, and the top of casing of these wells were 51.86, 48.93,
and 47.97 feet above mean sea level (NAVD88), respectively. Therefore, at these times,
the gradient will result in river water transporting inland, which may lead to fluctuating
PFAS concentrations at these wells.
The results from the Q4 2020 groundwater monitoring event were used to calculate the
contribution of onsite groundwater in the Black Creek Aquifer to the PFAS mass
discharge to the Cape Fear River. The details of the calculations can be found in Appendix
G.
4 PFAS MASS LOAD TO CAPE FEAR RIVER
This section presents results of the Cape Fear River PFAS mass loads for the present
reporting period of October 1, 2020 to December 31, 2020. Specifically, this section
discusses three types of mass loads:
1. The total measured in-river PFAS mass load based on time-weighted
concentration measurements of PFAS primarily from composite samples of Cape
Fear River water and measured Cape Fear River flow volumes at the W.O. Huske
Dam that are adjusted for travel times to the downstream monitoring location at
the CFR-TARHEEL;
2. The total measured and estimated PFAS mass load captured by remedies
implemented by Chemours; this is the load fraction that was prevented from
reaching the Cape Fear River; and
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 12 March 2021
3. The total measured PFAS mass load to the Cape Fear River is defined as the sum
of the measured in-river loads and the remedy prevented loads. This total mass
load is calculated following Equation 1 below:
Equation 1: Total PFAS Mass Load 𝑀𝑀𝐶𝐶𝐶𝐶𝐶𝐶= 𝑚𝑚𝐶𝐶𝐶𝐶𝐶𝐶+𝑚𝑚𝐶𝐶𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅
where, 𝑀𝑀𝐶𝐶𝐶𝐶𝐶𝐶 = is the Mass Load of PFAS compounds in the Cape Fear River, including the
mass load prevented from reaching the Cape Fear River by implemented
remedies, measured in kilograms (kg); 𝑚𝑚𝐶𝐶𝐶𝐶𝐶𝐶 = is the In-River Mass Load estimated using PFAS concentrations in samples
taken in the Cape Fear River downstream of the Site where the river is well mixed
and using measured river flow volumes; and 𝑚𝑚𝐶𝐶𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 = is the Captured Mass Load prevented from reaching the Cape Fear River
by remedies implemented by Chemours;
Remedies that have been implemented by Chemours in Q4 2020 include the Old Outfall
002 treatment system (October 1, 2020) and the Seep C flow through cell (December 16,
2020). Both remedies prevent PFAS mass loads from reaching the Cape Fear River and
were quantified in the 𝑚𝑚𝐶𝐶𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 term of Equation 1. The specific methodology for
estimating the prevented mass per remedy was developed on a per remedy basis and
details of these calculations are provided in Appendix B and described further in the Cape
Fear River PFAS Mass Loading Calculation Protocol Version 2 (Geosyntec, 2020d). The
goal of such calculations was to estimate, for a given time period, the PFAS mass diverted
from reaching the Cape Fear River by the remedy that would have otherwise reached the
Cape Fear River.
There have been numerous other interim and permanent actions taken to limit PFAS
reaching the Cape Fear River prior to this baseline period, i.e., air abatement measures
(installation of the thermal oxidizer and carbon beds, etc.), grouting of the terracotta pipe,
sediment removal from onsite channels, among others, and these may not be captured in
this captured mass load calculation but should be considered in the overall assessment of
PFAS reductions.
4.1 Total PFAS Mass Load
During the Q4 reporting period, the Total PFAS mass load in the Cape Fear River,
including the mass load prevented from reaching the Cape Fear River by implemented
remedies, was 102.5 kg (Tables 11, 12A, 12B, and 12C). The total in-river mass load
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 13 March 2021
was 76.7 kg, which was estimated based on the 51 mass loading estimation intervals
presented in Table 12A. These estimates were distributed over 2.1 billion cubic meters
(m3) or 74 billion cubic feet3 of river water that passed by the CFR-TARHEEL sampling
location.
The total measured and estimated PFAS mass load captured by remedies implemented by
Chemours was 25.8 kg, which was estimated based on the concentrations in samples
collected at the influent and effluent (as reported in Appendix B) and measured flows at
the Old Outfall 002 treatment system and the Seep C flow through cell (Tables 12B and
12C). For the Old Outfall 002 treatment system, a total of 24.8 kg was captured and
prevented from reaching the Cape Fear River. This estimate was based on three mass
loading estimation intervals between October 1, 2020 and December 31, 2020 (Table
12B). For the Seep C flow through cell, a total of 1.0 kg was captured and prevented from
reaching the Cape Fear River. This estimate was based on 2 mass loading estimation
intervals between December 16, 2020 and December 31, 2020 (Table 12C).

Start Date End Date Days Total Table 3+ Load in Cape Fear River (kg)
Total Table 3+ Remedy Reduction Load
(kg)
Total Table 3+ Total Load to Cape Fear River
(kg)
03/28/2020 05/09/2020 43 45.8 0 45.8
05/09/2020 06/29/2020 51 79.7 0 79.7
06/29/2020 9/30/2020 93 78.5 0 78.5 10/01/2020 12/30/2020 90 76.7 25.8 102.5 Total 277 280.7 25.8 306.5

The Total in-river PFAS mass discharges are provided in Table 13, which includes results
from previous quarters in 2020. For Q4 2020, the Total Table 3+ mass discharge ranged
from 0.97 milligrams per second (mg/s) (CFR-TARHEEL-122820) to 51 mg/s (CFR-
TARHEEL-20-111220). This wider range of mass discharges are likely attributed to the
significant rain events that occurred in November and December 2020.
The plots of Total Table 3+ concentrations over time in Figure 8 indicate that, generally,
concentrations in the Cape Fear River are inversely correlated to river flow rate. That is,
concentrations were higher when flow rates were lowest, while concentrations were lower
when river flow rates were higher. This trend is likely related to the degree of dilution

3 The volume of river water was provided in cubic meters (USGS, 2019) and was converted to cubic feet for reference.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 14 March 2021
occurring in the river. Higher river flows lead to a greater volume of water that the mass
loads are distributed over leading to a lower concentration value.
The plots of Total Table 3+ mass discharge over time in Figure 9 show that the mass
discharge since March 28, 2020 are typically between 5 and 20 mg/s with approximately
76% of the data falling within this range. The minimum and maximum mass discharge
were 0.97 mg/s (CFR-TARHEEL-122820) to 51 mg/s (CFR-TARHEEL-20-111220),
respectively, which correspond to samples collected during Q4 2020.
4.2 Mass Discharge at Bladen Bluffs, Tar Heel Ferry Road Bridge and Kings Bluff
Intake Canal
The Total Table 3+ concentrations and mass discharge values from the program are
shown in the table below. Total Table 3+ concentrations at the three downstream river
locations ranged from 55 ng/L (CFR-TARHEEL) to 79 ng/L (CFR-KINGS). The Total
Table 3+ mass discharge ranged from 9.5 mg/s (CFR-TARHEEL) to 17.1 mg/s (CFR-
KINGS). In previous assessments, CFR-KINGS is sampled approximately three days
after CFR-TARHEEL and CFR-BLADEN to account for travel time between these two
locations and CFR-KINGS. In Q4 2020, CFR-KINGS was sampled sooner than three
days due to rising river levels, which may explain the difference in mass discharges
between CFR-KINGS and the other two locations.
Sample
Location
Sample Collection
Date
Flow Rate
(cfs)
Total Table 3+
Concentration (ng/L) Mass Discharge (mg/s)
CFR-BLADEN 12/15/2020 6,420 60 11
CFR-TARHEEL 12/15/2020 6,130 55 9.5
CFR-KINGS 12/16/2020 7,650 79 17.1
5 CAPE FEAR RIVER PFAS MASS LOADING MODEL
While Section 4 presented the mass load in the Cape Fear River, this section presents an
analysis evaluating the relative loadings from the identified PFAS transport pathways to
the observed in-river PFAS mass discharge. This evaluation helps to confirm that the
pathways, where mitigative measures are planned, will result in reductions of PFAS
loading to the Cape Fear River. This evaluation was performed using the Mass Loading
Model. The following subsections describe the transport pathways, model design, and the
results of the Mass Loading Model assessment, including the sensitivity and the
limitations of the Mass Loading Model.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 15 March 2021
5.1 PFAS Mass Loading Model Pathways
The nine potential pathways representing compartments to the PFAS Mass Loading
Model are briefly described below and described in more detail in the Cape Fear River
PFAS Mass Loading Calculation Protocol Version 2 (Geosyntec, 2020d). The following
pathways were identified as potential contributors of PFAS to the river PFAS
concentrations:
• Transport Pathway 1: Upstream Cape Fear River and Groundwater – This
pathway is comprised of contributions from non-Chemours related PFAS sources
on the Cape Fear River and tributaries upstream of the Site, and upstream offsite
groundwater with PFAS present from aerial deposition;
• Transport Pathway 2: Willis Creek – Groundwater and stormwater discharge
and aerial deposition to Willis Creek and then to the Cape Fear River;
• Transport Pathway 3: Direct aerial deposition of PFAS on the Cape Fear River
(see Appendix H for further details);
• Transport Pathway 4: Outfall 002 – Comprised of (i) water drawn from the Cape
Fear River and used as non-contact cooling water, (ii) treated non-Chemours
process water, (iii) Site stormwater, (iv) steam condensate, and (v) power
neutralization discharge, which are then discharged through Outfall 002;
• Transport Pathway 5: Onsite Groundwater – Direct upwelling of onsite
groundwater to the Cape Fear River from the Black Creek Aquifer (see Appendix
G for further details);
• Transport Pathway 6: Seeps – Onsite groundwater seeps A, B, C and D and
offsite Lock and Dam Seep above the Cape Fear River water level on the bluff
face from the facility that discharge into the Cape Fear River;
• Transport Pathway 7: Old Outfall 002 – Groundwater discharge to Old Outfall
002 and stormwater runoff that flows into the Cape Fear River;
• Transport Pathway 8: Adjacent and Downstream Offsite Groundwater – Offsite
groundwater adjacent and downstream of the Site upwelling to the Cape Fear
River (see Appendix I for further details); and,
• Transport Pathway 9: Georgia Branch Creek – Groundwater, stormwater
discharge and aerial deposition to Georgia Branch Creek and then to the Cape
Fear River.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 16 March 2021
5.2 Model Design
The Mass Loading Model estimates the mass discharge of PFAS from the transport
pathways to the Cape Fear River. The Total PFAS mass discharge entering the Cape Fear
River is defined in this model as the combined mass per unit time (MT-1) or mass
discharge (e.g., mg/s) from potential pathways identified in Section 5.1. Total PFAS
mass load entering the Cape Fear River is calculated as:
Equation 2: Cape Fear River Estimated Mass Discharge from Mass Loading Model 𝑀𝑀𝑀𝑀𝐶𝐶𝐶𝐶𝐶𝐶= ��𝑀𝑀𝑀𝑀𝑝𝑝,𝑅𝑅=���𝐶𝐶𝑛𝑛,𝑅𝑅× 𝑄𝑄𝑛𝑛� 𝐼𝐼
𝑅𝑅=1
9
𝑝𝑝=1
𝐼𝐼
𝑅𝑅=1
9
𝑝𝑝=1
where,
MDCFR = Total PFAS estimated mass discharge entering the Cape Fear River,
measured in MT-1, typically mg/s;
p = represents each of the 9 potential PFAS transport pathways listed in Section 5.1.
To facilitate model construction, the Seeps (Transport Pathway 6) were further
discretized as Seep A (Transport Pathway 6A), Seep B (Transport Pathway 6B),
Seep C (Transport Pathway 6C) and Seep D (Transport Pathway 6D);
i = represents each of the PFAS constituents being evaluated;
I = represents total number of PFAS constituents included in the summation of Total
PFAS concentrations;
MDp,i = mass load of each PFAS constituent i from each potential pathway p with
measured units in MT-1, typically mg/s;
Cp,i = concentration of each PFAS constituent i from each potential pathway p with
measured units in mass per unit volume [ML-3], typically ng/L; and
Qn = volumetric flow rate from each potential pathway n with measured units in
volume per time [L3T-1], typically liters per second (L/s).
For the Q4 2020 Mass Loading Model assessment, data sources used as model inputs for
each potential pathway are described in Table 14. These data sources included flow
measurements, water levels and analytical results from the Q4 2020 sampling events (as
discussed in Section 3) and supplemental data provided in Appendices D, G, H, and I.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 17 March 2021
5.2.1 Adjustments to Mass Loading Model Calculations
In Q4 2020, the Mass Loading Model assessment also includes mass discharge estimates
for each pathway before and after remedies have been implemented. More specifically,
the “Before Remedies” Total PFAS mass discharge are estimated using the model
assuming a remedy had not been implemented. For Q4, the only remedy that had been
implemented before the Mass Loading Model sampling event was the Old Outfall 002
Treatment system. Therefore, this “Before Remedies” Total PFAS mass discharge was
estimated using the concentrations from the influent at the Old Outfall Treatment System.
As additional remedies are implemented, similar “Before Remedy” estimates will be
calculated for the other pathways. The “After Remedies” Total PFAS mass discharge are
estimated using the model as was done in previous assessments with the concentrations
measured from the specified sampling location for each pathway (Figure 4).
Another adjustment to the model made in Q4 2020 was the derivation of the lower and
upper bounds on the model estimated mass discharge. In the previous three quarterly
assessments, the hydraulic conductivity in the Black Creek Aquifer, one of the most
sensitive input parameters into the model, was varied to better understand the potential
range of PFAS mass discharge from onsite groundwater (Transport Pathway 5)
discharging to the Cape Fear River. Therefore, the lower and upper bounds for the model-
estimated mass discharge was derived using the minimum and geometric mean hydraulic
conductivity values, respectively, for the onsite groundwater term. In Q4 2020, as part of
the groundwater pre-design investigation in November and December 2020, the hydraulic
conductivity was estimated using the results of constant rate tests performed at five
extraction wells installed in the Black Creek Aquifer upstream of the river frontage
(Appendix G). These hydraulic conductivity estimates were considered to have less
uncertainty than previous estimates. Instead, the lower and upper bounds for the mass
discharge were constructed using a range of hydraulic gradients calculated using two
different contour elevation differences in the vicinity of the river frontage: a ten-foot
elevation difference (between the 40 and 50 ft contours) and a twenty-foot elevation
difference (between the 40 and 60 ft contours). Using two contour elevation differences
captures the variation in hydraulic gradient estimates over a range of spatial scales (see
Appendix G for more details). This adjustment to the onsite groundwater mass discharge
calculation still provides a lower and upper bound to the mass discharge estimate, but the
range in mass discharge estimates are narrower.
5.3 Mass Loading Model Results
USGS rain gauge 02105500 indicated 1 inch of precipitation during the week of sample
collection (December 14 to 16, 2020), therefore, the Q4 2020 event was considered to be
a wet weather event.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 18 March 2021
The pathway-specific PFAS mass discharges estimated from the Mass Loading Model
and measured at CFR-TARHEEL are summarized in Tables 15A and 15B. A summary
of the Total PFAS mass discharge estimates per pathway and a comparison to the
measured mass discharge at CFR-TARHEEL is provided in Table 16A, Table 16B and
shown in Figure 14. A comparison of relative contributions per pathway among the three
quarterly events conducted in 2020 is provided in Table 17.
The model-estimated Before Remedies Total Table 3+ mass discharge estimates ranged
from 12.7 mg/s (lower bound) to 13.3 mg/s (upper bound), while the After Remedies
Total Table 3+ mass discharge estimates ranged from 10.6 mg/s to 11.2 mg/s (Tables 16A
and 16B). For this one snapshot in time, this means that the operation of the Old Outfall
002 treatment system was effective at reducing the Total Table 3+ mass discharge by 2.1
mg/s.
The model-estimated After Remedies Total Table 3+ mass discharge estimates were used
to compare to the measured mass discharge estimates at CFR-TARHEEL. As mentioned
above, the model-estimated After Remedies Total Table 3+ mass discharge ranged from
10.6 mg/s (lower bound) to 11.2 mg/s (upper bound), while the measured mass discharge
at CFR-TARHEEL was 16.1 mg/s (Table 16B and Figure 14). While the ranges in the
lower and upper bounds for the modeled mass discharge estimates are not wide (within
0.6 mg/s), the measured mass discharge at CFR-TARHEEL is higher than the modeled
estimates. Several hypotheses are being explored to understand the differences between
modeled and measured mass discharge and are described in Section 5.5.
In terms of relative contributions, the most significant pathways are the Seeps (Transport
Pathway 6) and Onsite Groundwater (Transport Pathway 5). Previous assessments
showed that Old Outfall 002 (Pathway 7) was also a significant contributor; however,
remedy implementation has reduced the contribution from this pathway to <1% (Figure
14). Further reductions are anticipated in 2021 from the Seeps, i.e., due to installation of
the flow through cell remedies.
5.3.1 Before Remedies Relative Contributions by Pathway
The Mass Loading Model estimates that the seeps (Transport Pathway 6) had the highest
contribution of Total Table 3+ mass discharge in December 2020. The seeps contributed
from 41% to 43% of the total mass discharge, which is consistent with the prior
assessments (Table 17). Reductions from this pathway (i.e., due to installation of the flow
through cells) are anticipated in future assessments, particularly at Seep C where the flow
through cell became operational on December 16, 2020.
Old Outfall 002 (Transport Pathways 7) would have been the next highest contributor
with a relative contribution of Total Table 3+ mass discharge ranging from 16% to 17%.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 19 March 2021
However, the After Remedies model-estimated mass discharge from Old Outfall 002 was
significantly lower (0.06 mg/s) and was <1% of the After Remedies Total Table 3+ mass
discharge than that of the Before Remedies Total Table 3+ mass discharge. This
significant decrease in contribution is attributed to installation of the Outfall 003
treatment system which began discharging treated water since October 1, 2020 (i.e.,
beginning of Q4 2020). As such, contributions from Old Outfall 002 are expected to
remain minimal in future assessments.
Onsite groundwater (Transport Pathway 5) is the next highest mass discharge pathway to
the Cape Fear River, contributing from 13% to 18% of the model estimated Total Table
3+ mass discharge (Table 17 and Figure 14), which is within the range of previous
assessments; however, the range is slightly narrower than previous assessments. This
potentially can be explained by two factors. Firstly, in Q4 2020, Table 3+ concentrations
at PIW-7D (one of the wells along the river frontage used to calculate the onsite mass
discharge) was lower than previous events. Secondly, as mentioned in Section 5.2.1, as
part of the groundwater pre-design investigation in November and December 2020, the
hydraulic conductivity was estimated using the results of constant rate tests performed at
five extraction wells installed in the Black Creek Aquifer upstream of the river frontage
(Appendix G). These hydraulic conductivity estimates were considered to have less
uncertainty than previous estimates.
The Upstream River Water and Groundwater and Adjacent and Downstream Offsite
Groundwater (Transport Pathways 1 and 8, respectively) were estimated to have a
combined contribution of Total Table 3+ mass discharge of approximately 13% (Table
17). The upstream river and groundwater pathway contributed approximately 9%, while
the Adjacent and Downstream Offsite Groundwater pathway contributed approximately
4%. The total flow volume recorded in Q4 2020 (4,100 MG) was much higher than that
recorded in previous events, likely due to the precipitation that occurred during sample
collection in Q4 2020. Accordingly, at such low concentrations, the mass discharge
estimates are sensitive to changes in flow which resulted in a slightly higher relative
contribution for these pathways in Q4 2020 compared to past assessments.
Willis Creek and Georgia Branch Creek (Transport Pathways 2 and 9, respectively) were
estimated to contribute approximately 11% of the Total Table 3+ mass discharge to the
Cape Fear River in December 2020. These contributions are consistent with estimated
contributions reported in previous assessments.
Outfall 002 (Transport Pathways 4) contributed 3% of the Total Table 3+ mass discharge,
which is consistent with previous assessments. The aerial Deposition (Pathway 3)
remained the same with a relative contribution of <1%.

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 20 March 2021
Pathway
Total Table 3+
Q1 2020 (April 2020) Q2 2020 (May 2020) Q3 2020 (July 2020)
Before Remedies Q4 2020 (December 2020)
Lower Upper Lower Upper Lower Upper Lower Upper
[1] Upstream River Water and GW 0% 0% 9% 8% 1% 1% 9% 9%
[2] Willis Creek 4% 3% 3% 3% 5% 4% 7% 7%
[3] Aerial Deposition <1% <1% <1% <1% <1% <1% <1% <1%
[4] Outfall 002 1% <1% 1% 1% 1% <1% 3% 3%
[5] Onsite GW 5% 43% 2% 19% 3% 26% 13% 18%
[6] Seeps 56% 34% 49% 41% 53% 41% 43% 41%
[7] Old Outfall 002 30% 23% 28% 23% 34% 26% 17% 16%
[8] Offsite Adj. and Downstream GW 0% 0% 4% 3% <1% <1% 3% 3%
[9] Georgia Branch Creek 4% 2% 4% 3% 2% 2% 6% 5%

5.4 Mass Loading Model Sensitivity and Limitations
The Mass Loading Model assessments provide PFAS mass discharge estimates and
relative proportions of loadings for a ‘snapshot’ in time. While controlling for temporal
variability, the model-based mass discharge estimates contain some level of uncertainty
due to the inherent variability and measurement error in the input parameters, e.g., flow,
concentrations, etc. To better understand the sensitivity of the model to the various
pathway-specific input parameters, the uncertainties associated with the input parameters
were used to conduct a sensitivity analysis. For each pathway, the input parameters, the
assumed associated uncertainties, and the resulting level of model sensitivity were
presented in first quarter 2020 (Q1 2020) report (Geosyntec, 2020b).
5.4.1 Upper and Lower Bounds
In Q4 2020, as part of the groundwater pre-design investigation in November and
December 2020, the hydraulic conductivity was estimated using the results of constant
rate tests performed at five extraction wells installed in the Black Creek Aquifer upstream
of the river frontage (Appendix G). These hydraulic conductivity estimates were
considered to have less uncertainty than previous estimates, where the lower and upper
bounds were derived using the minimum and geometric mean hydraulic conductivities,
respectively, from slug tests. In this Q4 2020 assessment, the lower and upper bounds
for the mass discharge were constructed using a range of hydraulic gradients, which
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 21 March 2021
resulted in a narrower range in mass discharge estimates for the onsite groundwater
pathway. Ongoing groundwater and seep remedy pre-design investigations and remedy
installations will help refine the understanding of relationships between the pathways and
their relative contributions, particularly for onsite groundwater.
5.4.2 River Flows and Precipitation
Additional sensitives observed in this Q4 assessment were those associated with higher
river flows due to the higher level of precipitation that occurred during sample collection.
This Q4 assessment was the first wet event in 2020 and the total flow volume recorded
in Q4 2020 (4,100 MG) was much higher than that recorded in previous events. As such,
the mass discharge estimates could potentially be more sensitive to this increase in flow,
particularly at the wells along the frontage of the Cape Fear River (affecting the onsite
groundwater pathway) and the river samples (e.g., CFR-MILE-76 affecting the upstream
river pathway). These sensitivities will be studied further in future assessments, especially
the Q1 2021 assessment, where higher precipitation and river flows have also been
observed.
5.5 Modeled Versus Measured Mass Discharges
As described in previous Cape Fear River PFAS Mass Loading Assessment reports
(Geosyntec, 2020b; Geosyntec, 2020c; Geosyntec, 2020e), the Mass Loading Model is a
suitable tool to evaluate which PFAS transport pathways are significant contributors of
mass to the Cape Fear River, but the results of the model either under or overestimate the
mass discharge observed in the Cape Fear River. These discrepancies are being evaluated
via a series of hypotheses as outlined in the second quarter 2020 (Q2 2020) report
(Geosyntec, 2020c). Chemours is presently assessing these hypotheses with the data
being collected in third quarter 2020 (Q3 2020), Q4 2020 and Q1 2021 to test these
hypotheses. For example, once the seep flow through cells are installed, the flow rates at
the seeps will be evaluated for accuracy.
Additionally, based on the observations in this Q4 2020 wet event, additional factors,
such as the effect of higher levels of precipitation and river flows on flow measurement,
sample collection methods, and analytical results will be evaluated to further elucidate
the discrepancies between modeled and measured mass discharges for wet events. The
Q1 2021 report will provide an update on the evaluation of these hypotheses and factors.
6 SUMMARY
Two sampling events were conducted in Q4 2020:
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 22 March 2021
• The PFAS Mass Load Sampling program consisting of 22 composite samples and
11 grab samples collected at the Tar Heel Ferry Road Bridge. The analytical
results of these samples were used to calculate the in-river PFAS mass loads in
the Cape Fear River during the reporting period; and
• The Q4 2020 PFAS Mass Loading Model Sampling program consisting of
samples collected from PFAS transport pathways (seeps, creeks, Old Outfall,
Outfall 002, groundwater and Cape Fear River) and paired water flow
measurements and estimates. These data were used to assess the relative loadings
per transport pathway to the Cape Fear River using the PFAS Mass Loading
Model.
The Cape Fear River PFAS Mass Load assessment estimated the Total PFAS that was
either discharged or prevented from being discharged to the Cape Fear River over the
load assessment period of October 1, 2020 to December 31, 2020. Over this period, the
Total PFAS mass load in the Cape Fear River, including the mass load prevented from
reaching the Cape Fear River by implemented remedies, was 102.5 kg, where 76.7 kg
was the in-river mass load measured at CFR-TARHEEL and 25.8 kg was the mass load
prevented from reaching the Cape Fear River due to the installation of remedies at Old
Outfall 002 (24.8 kg due to the Outfall 003 treatment system) and at Seep C (1.0 kg due
to the flow-through cell). This equates to a total 25% reduction in mass loading with
almost all of this reduction resulting from the Outfall 003 treatment system. This is
because the Seep C flow through cell became operation at the end of Q4 2020 (on
December 16, 2020). Hence, further reductions from the Seep C flow through cell are
anticipated in future quarterly assessments. Overall, the mass being prevented from
reaching the Cape Fear River will continue to increase as more remedies are being
implemented by Chemours.
The Cape Fear River Mass Loading Model assessments showed that the model-estimated
After Remedies Total Table 3+ mass discharge was 2.1 mg/s lower than the model-
estimated Before Remedies. This means that the operation of the Old Outfall 002
treatment system reduced the Total Table 3+ mass discharge by 2.1 mg/s in Q4 2020.
While the ranges in the Total Table 3+ lower and upper bounds were small (range of 0.6
mg/s), the measured mass discharge at CFR-TARHEEL (16.1 mg/s) was higher than the
After Remedies modeled estimates (10.6 mg/s to 11.2 mg/s). The same trends persisted
for the modeled and measured mass discharge estimates when using Total Attachment C
or Total Table 3+ (20 compounds) concentrations. The most significant pathways are the
Seeps (Transport Pathway 6) and Onsite Groundwater (Transport Pathway 5). Previous
assessments showed that Old Outfall 002 (Pathway 7) was also a significant contributor;
however, remedy implementation has reduced the contribution from this pathway to <1%.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 23 March 2021
Further reductions are anticipated in 2021 from the Seeps, i.e., due to installation of the
flow through cell remedies.
Sample collection will continue as outlined in the Cape Fear River Mass Loading
Calculation Protocol Version 2 (Geosyntec 2020d). Capture and treatment of water from
the Old Outfall 002 and Seep C has begun and future sampling events will continue to
evaluate PFAS mass loads and associated remedy facilitated reductions at CFR-
TARHEEL.
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A 24 March 2021
7 REFERENCES
Geosyntec, 2019a. Cape Fear River PFAS Loading Reduction Plan – Supplemental
Geosyntec, 2019a. Seeps and Creeks Investigation Report. Chemours Fayetteville
Works. August 26, 2019.
Geosyntec, 2019b. On and Offsite Assessment. Chemours Fayetteville Works. September
30, 2019.
Geosyntec, 2019c. Corrective Action Plan. Chemours Fayetteville Works. December 31,
2019.
Geosyntec, 2020a. Matrix Interference During Analysis of Table 3+ Compounds.
Chemours Fayetteville Works. June 30, 2020.
Geosyntec, 2020b. Cape Fear River Table 3+ PFAS Mass Loading Assessment – First
Quarter 2020 Report, Chemours Fayetteville Works. July 31, 2020.
Geosyntec, 2020c. Cape Fear River PFAS Mass Loading Assessment – Second Quarter
2020 Report, Chemours Fayetteville Works. September 30, 2020.
Geosyntec, 2020d. Cape Fear River Mass Loading Calculation Protocol Version 2,
Chemours Fayetteville Works. November 18, 2020.
Geosyntec, 2020e. Cape Fear River PFAS Mass Loading Assessment – Third Quarter
2020 Report, Chemours Fayetteville Works. December 23, 2020.
PubChem, 2020. Compound Summary: Perfluoroheptanoic acid; 8. Use and
Manufacturing. Viewed March 10, 2020. <
https://pubchem.ncbi.nlm.nih.gov/compound/Perfluoroheptanoic-acid#section=General-
Manufacturing-Information>

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A March 2021

TABLES

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 1
PFAS ANALYTE LIST
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC P.C.
Attachment C Table 3+
(17 compounds)
Table 3+
(20 compounds)
HFPO-DA2 ✔✔✔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
PFO5DA ✔✔✔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
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 C7H2F14O5S
PFHpA2 ✔----Perfluoroheptanoic acid 375-85-9 C7HF13O2
Notes:
1 - Analyzed under analytical method Table 3+ Lab SOP.
2 - HFPO-DA and PFHpA can be analyzed under methods Table 3+ SOP and EPA Method 537 Mod.
EPA - Environmental Protection Agency
PFAS - Per- and Polyfluoroalkyl substances
SOP - Standard Operating Procedure
PFAS Grouping
Common Name1 Chemical FormulaCASNChemical Name
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 2
SURFACE WATER SAMPLE COLLECTION AND FLOW MEASUREMENT SUMMARY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID Location Description Sample Collection Method1 Flow Measurement Method2
OLDOF-1 Mouth of Old Outfall 002 Grab Velocity Probe
SEEP-A-1 Mouth of Seep A 24-hour composite Velocity Probe
SEEP-B-1 Mouth of Seep B 24-hour composite Velocity Probe
SEEP-C-1 Mouth of Seep C 24-hour composite Velocity Probe
SEEP-D-1 Mouth of Seep D 24-hour composite Flume
LOCK-DAM SEEP Mouth of the Lock and Dam Seep Grab Velocity Probe
WC-1 Mouth of Willis Creek 24-hour composite Velocity Probe
GBC-1 Mouth of Georgia Branch Creek Grab Velocity Probe
CFR-MILE-76 Cape Fear River Mile 76 Grab USGS Data
CFR-BLADEN Cape Fear River at Bladen Bluffs Grab USGS Data
CFR-KINGS Cape Fear River at Kings Bluff Raw Water Grab USGS Data
CFR-TARHEEL Cape Fear River at Tar Heel Ferry Road Bridge Grab USGS Data
W.O. Huske Dam USGS Gauge Site No. 02105500 --USGS Data
Intake River Water at
Facility
Water Drawn Through the Intake Sampled at the
Power Area at the Site 24-hour composite Facility DMRs
Outfall 002 Outfall 002 in open channel 24-hour composite Facility DMRs
Notes:
-- - not sampled or not measured
DMRs - Discharge Monitoring Reports
EPA - Environmental Protection Agency
PFAS - per- and polyfluoroalkyl substances
USGS - USGS - United States Geological Survey
2 - Results of estimated flow at these locations are provided in Table 9 and supplemental flow measurement data are
included in Appendix D.
1 - Samples analyzed for PFAS by EPA Method 537 Mod and Table 3+ Lab SOP.
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 3
GROUNDWATER MONITORING WELL SAMPLE COLLECTION AND WATER LEVEL MEASUREMENT SUMMARY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC, PC
Area Water Bearing
Unit1 Well ID Adjacent Surface Water
Feature
Sample Collection
Date
Synoptic Water
Level Date
Onsite Black Creek PIW-3D Cape Fear River 12/11/2020 12/7/2020
Onsite Floodplain PIW-7S Cape Fear River 12/8/2020 12/7/2020
Onsite Black Creek PIW-7D Cape Fear River 12/8/2020 12/7/2020
Onsite Floodplain LTW-01 Cape Fear River 12/10/2020 12/7/2020
Onsite Black Creek LTW-02 Cape Fear River 12/10/2020 12/7/2020
Onsite Floodplain LTW-03 Cape Fear River 12/22/2020 12/7/2020
Onsite Floodplain LTW-04 Cape Fear River 12/8/2020 12/7/2020
Onsite Black Creek LTW-05 Cape Fear River 12/9/2020 12/7/2020
Onsite Black Creek PZ-22 Cape Fear River 12/9/2020 12/7/2020
Onsite Surficial PW-06 Georgia Branch Creek 12/8/2020 12/7/2020
Onsite Surficial PW-07 Georgia Branch Creek 12/9/2020 12/7/2020
Onsite Surficial PW-04 Old Outfall 12/8/2020 12/7/2020
Onsite Black Creek PW-112 Old Outfall --12/7/2020
Onsite Black Creek PW-09 Willis Creek 12/8/2020 12/7/2020
Onsite Surficial SMW-11 Willis Creek 12/8/2020 12/7/2020
Onsite Surficial SMW-10 Willis Creek 12/9/2020 12/7/2020
Onsite Black Creek SMW-12 Willis Creek 12/9/2020 12/7/2020
Onsite Floodplain PIW-1S Cape Fear River / Willis Creek 12/10/2020 12/7/2020
Onsite Surficial PIW-1D Cape Fear River / Willis Creek 12/10/2020 12/7/2020
Offsite Black Creek Bladen-1D2 Georgia Branch Creek --12/7/2020
Notes:
1 - Water Bearing Unit - refers to primary aquifer unit well screen is estimated to be screened within.
2 - Bladen-1D (damaged) and PW-11 (being pumped as part of the Pre-design Investigation activities) could not be sampled in December 2020.
-- - not applicable
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 4
GROUNDWATER ELEVATIONS - DECEMBER 2020
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Area1 Water Bearing Unit2 Well ID Gauging Date
Northing (ft, SPCS
NAD83)3
Easting (ft, SPCS
NAD83)3
Screened Interval
(ft)
TOC Elevation
(NAVD 88)4
Depth to Water
(from TOC)
Water Level (ft
NAVD88)
Onsite Black Creek Aquifer BCA-01 07-Dec-20 399780.058 2050662.219 91 - 101 146.3 61.87 84.43
Onsite Black Creek Aquifer BCA-02 07-Dec-20 396242.322 2051062.209 92 - 102 148.42 73.35 75.07
Onsite Black Creek Aquifer BCA-03R 07-Dec-20 398582.23 2049522.22 88 - 98 150.82 49.53 101.29
Onsite Black Creek Aquifer BCA-04 07-Dec-20 395877.665 2047823.111 94 - 104 150.24 27.86 122.38
Onsite Black Creek Aquifer EW-1 07-Dec-20 399934.646 2051297.513 40-60 91.328 31.18 60.15
Onsite Black Creek Aquifer EW-2 07-Dec-20 396164.476 2052232.61 40-65 77.245 33.9 43.35
Onsite Black Creek Aquifer EW-3 07-Dec-20 395059.777 2052214.657 37-67 76.48 14.93 61.55
Onsite Black Creek Aquifer EW-4 07-Dec-20 398581.514 2051805.577 53-73 80.643 30.07 50.57
Onsite Black Creek Aquifer EW-5 07-Dec-20 397200.161 2052052.653 37-67 78.502 33.12 45.38
Onsite Perched Zone FTA-01 07-Dec-20 397907.5036 2049373.609 12.0 - 22.0 150.63 16.49 134.14
Onsite Perched Zone FTA-02 07-Dec-20 397786.4293 2049206.271 11.5 - 21.5 150.28 17.4 132.88
Onsite Perched Zone FTA-03 07-Dec-20 397767.0874 2049313.856 12.0 - 22.0 151.08 17.4 133.68
Onsite Surficial Aquifer INSITU-01 07-Dec-20 401658.2 2046077.31 7.0 - 17.0 118.2 5.74 112.46
Onsite Surficial Aquifer INSITU-02 07-Dec-20 401863.46 2049136.62 7.0 - 17.0 113.12 DRY --
Onsite Floodplain Deposits LTW-01 07-Dec-20 399566.17 2052149.95 11.0 - 26.0 53.83 14.95 38.88
Onsite Black Creek Aquifer LTW-02 07-Dec-20 398848.36 2052354.37 28.0 - 38.0 52.48 9.28 43.2
Onsite Floodplain Deposits LTW-03 07-Dec-20 398115.15 2052557.52 15.0 - 30.0 52.91 11.67 41.24
Onsite Floodplain Deposits LTW-04 07-Dec-20 397280.2401 2052583.6 12.0 - 27.0 51.86 7.67 44.19
Onsite Black Creek Aquifer LTW-05 07-Dec-20 396430.68 2052738.06 29.0 - 44.0 52.01 9.23 42.78
Onsite Perched Zone MW-11 07-Dec-20 396544.4 2049051.06 11.5 - 21.5 148.53 23.38 125.15
Onsite Perched Zone MW-12S 07-Dec-20 397253.6045 2049273.891 17.5 - 22.5 152.06 19.5 132.56
Onsite Surficial Aquifer MW-13D 07-Dec-20 397119.015 2049821.123 57 - 67 148.65 43.9 104.75
Onsite Surficial Aquifer MW-14D 07-Dec-20 396974.485 2049074.561 62 - 72 149.73 39.44 110.29
Onsite Surficial Aquifer MW-15DRR 07-Dec-20 398580.71 2049511.75 52.5 - 62.5 150.92 47.71 103.21
Onsite Surficial Aquifer MW-16D 07-Dec-20 398493.703 2048402.838 72 - 82 148.41 35.52 112.89
Onsite Surficial Aquifer MW-17D 07-Dec-20 398401.741 2047366.496 57 - 67 146.117 28.38 117.74
Onsite Surficial Aquifer MW-18D 07-Dec-20 400947.378 2046574.719 50 - 60 107.57 18.78 88.79
Onsite Surficial Aquifer MW-19D 07-Dec-20 401151.328 2048272.989 46 - 56 139.55 49.52 90.03
Onsite Perched Zone MW-1S 07-Dec-20 397080.3135 2049120.726 21.0-24.0 149.93 18.59 131.34
Onsite Surficial Aquifer MW-20D 07-Dec-20 400791.284 2048733.906 65 - 75 137.18 46.3 90.88
Onsite Surficial Aquifer MW-21D 07-Dec-20 399501.7 2047074.955 72 - 82 151.384 44.61 106.77
Onsite Surficial Aquifer MW-22D 07-Dec-20 398518.177 2048362.681 52 - 72 149.06 35.42 113.64
Onsite Perched Zone MW-23 07-Dec-20 396237.61 2051063.25 9.5 - 14.5 148.34 14.01 134.33
Onsite Perched Zone MW-24 07-Dec-20 397303.94 2048767.69 18.8 - 23.8 150.31 21.39 128.92
Onsite Perched Zone MW-25 07-Dec-20 396753.37 2050989.82 12 - 17 147.59 13.48 134.11
Onsite Perched Zone MW-26 07-Dec-20 396265.18 2051484.67 5 - 10 147.7 11.2 136.5
Onsite Perched Zone MW-27 07-Dec-20 396010.33 2051472 10 - 15 146.83 14.39 132.44
Onsite Perched Zone MW-28 07-Dec-20 395719.79 2051165.93 9 - 14 144.7 13.41 131.29
Onsite Perched Zone MW-2S 07-Dec-20 396934.7481 2049321.849 19.0 - 23.0 149.91 NM --
Onsite Perched Zone MW-30 07-Dec-20 397340.79 2050776.09 10 - 15 147.67 12.57 135.1
Onsite Perched Zone MW-31 07-Dec-20 396390.502 2049622.884 17-22 147.699 15.88 131.82
Onsite Perched Zone MW-32 07-Dec-20 396359.577 2049651.789 13-18.5 147.106 14.87 132.24
TR0795 Page 1 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 4
GROUNDWATER ELEVATIONS - DECEMBER 2020
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Area1 Water Bearing Unit2 Well ID Gauging Date3 Northing (ft, SPCS
NAD83)4
Easting (ft, SPCS
NAD83)4
Screened Interval
(ft)
TOC Elevation
(NAVD 88)5
Depth to Water
(from TOC)
Water Level (ft
NAVD88)
Onsite Perched Zone MW-33 07-Dec-20 396337.507 2049678.558 12-17 146.82 14.35 132.47
Onsite Perched Zone MW-34 07-Dec-20 396352.902 2049619.086 17-22 147.972 15.84 132.13
Onsite Perched Zone MW-35 07-Dec-20 396332.943 2049631.155 14-19 147.541 15.33 132.21
Onsite Perched Zone MW-36 07-Dec-20 396320.088 2049651.174 12-17 147.889 15.6 132.29
Onsite Perched Zone MW-7S 07-Dec-20 397444.5245 2049809.731 NM 147.47 9.98 137.49
Onsite Perched Zone MW-8S 07-Dec-20 397096.4767 2049867.768 NM 146.48 4.54 141.94
Onsite Perched Zone MW-9S 07-Dec-20 396760.1617 2049734.296 17.5-22.5 154.39 21 133.39
Onsite Perched Zone NAF-01 07-Dec-20 398349.7685 2050338.812 5.0-15.0 149.66 8.71 140.95
Onsite Perched Zone NAF-02 07-Dec-20 398662.7963 2050640.863 5.0-15.0 150.31 9.26 141.05
Onsite Perched Zone NAF-03 07-Dec-20 398580.6546 2050755.433 5.0-15.0 150.44 9.52 140.92
Onsite Perched Zone NAF-04 07-Dec-20 398446.998 2050718.95 5.0-15.0 148.1 NM --
Onsite Perched Zone NAF-06 07-Dec-20 398809.6599 2050911.91 2.75 - 12.75 146.43 11.56 134.87
Onsite Perched Zone NAF-07 07-Dec-20 398899.33 2050616.5 5.5 - 15.5 149.69 9.09 140.6
Onsite Perched Zone NAF-08A 07-Dec-20 398097.99 2050886.62 5.0 - 15.0 148.82 8.09 140.73
Onsite Surficial Aquifer NAF-08B 07-Dec-20 398095.64 2050879.94 43.5 - 53.5 148.86 53.42 95.44
Onsite Perched Zone NAF-09 07-Dec-20 397711.0932 2050806.518 7.0 - 17.0 149.29 11.36 137.93
Onsite Perched Zone NAF-10 07-Dec-20 397612.5699 2050423.15 8.25 - 18.25 150 11.46 138.54
Onsite Perched Zone NAF-11A 07-Dec-20 398909.29 2050999.92 2.5 - 7.5 140.59 3.77 136.82
Onsite Surficial Aquifer NAF-11B 07-Dec-20 398911.13 2050995.88 33.5 - 43.5 140.74 46.61 94.13
Onsite Perched Zone NAF-12 07-Dec-20 398270.555 2050777.49 18 - 23 145.932 5.78 140.01
Onsite Black Creek Aquifer OW-1 07-Dec-20 399930.529 2051287.873 40-50 95.012 35.23 59.78
Onsite Black Creek Aquifer OW-10 07-Dec-20 399948.17 2051291.21 57-67 94.386 34.57 59.82
Onsite Black Creek Aquifer OW-2 07-Dec-20 398572.28 2051801.622 63-73 84.366 34.03 50.34
Onsite Black Creek Aquifer OW-3 07-Dec-20 398601.078 2051812.319 63-73 84.644 34.5 50.14
Onsite Black Creek Aquifer OW-4 07-Dec-20 395049.163 2052210.811 47-57 80.847 19.28 61.57
Onsite Black Creek Aquifer OW-5 07-Dec-20 395070.028 2052196.97 54-64 81.61 19.83 61.78
Onsite Black Creek Aquifer OW-6 07-Dec-20 396168.409 2052223.536 50-60 80.528 37.73 42.8
Onsite Black Creek Aquifer OW-7 07-Dec-20 397180.061 2052052.688 54-64 81.446 36.1 45.35
Onsite Black Creek Aquifer OW-8 07-Dec-20 397202.33 2052041.982 57-67 82.302 37.7 44.6
Onsite Black Creek Aquifer OW-9 07-Dec-20 395075.135 2052211.065 57-67 79.776 18.07 61.71
Onsite Black Creek Aquifer PIW-10DR 07-Dec-20 395093.99 2052297.3 53 - 58 75.91 14.75 61.16
Onsite Surficial Aquifer PIW-10S 07-Dec-20 395104.674 2052297.041 7 - 17 76.451 18.52 57.93
Onsite Black Creek Aquifer PIW-11 07-Dec-20 401911.034 2050416.292 47-57 67.015 21.91 45.1
Onsite Black Creek Aquifer PIW-12 07-Dec-20 401703.1 2051025.774 64-74 83.775 48.25 35.53
Onsite Black Creek Aquifer PIW-13 07-Dec-20 401464.287 2051122.604 54-64 83.18 46.98 36.2
Onsite Black Creek Aquifer PIW-14 07-Dec-20 401163.98 2051186.57 56-66 87.428 50.42 37.01
Onsite Black Creek Aquifer PIW-15 07-Dec-20 400706.507 2051532.802 34-44 67.845 32.27 35.57
Onsite Black Creek Aquifer PIW-16D 07-Dec-20 396267.835 2046586.094 90-100 149.737 18.95 130.79
Onsite Black Creek Aquifer PIW-16S 07-Dec-20 396257.961 2046587.074 35-45 150.056 14.95 135.11
Onsite Black Creek Aquifer PIW-1D 07-Dec-20 400547.772 2051801.42 24.5 - 29.5 52.33 15.96 36.37
Onsite Floodplain Deposits PIW-1S 07-Dec-20 400540.611 2051792.586 7.8 - 17.8 54.198 18.85 35.35
Onsite Black Creek Aquifer PIW-2D 07-Dec-20 399925.459 2051316.312 40 - 50 96.13 36.45 59.68
TR0795 Page 2 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 4
GROUNDWATER ELEVATIONS - DECEMBER 2020
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Area1 Water Bearing Unit2 Well ID Gauging Date3 Northing (ft, SPCS
NAD83)4
Easting (ft, SPCS
NAD83)4
Screened Interval
(ft)
TOC Elevation
(NAVD 88)5
Depth to Water
(from TOC)
Water Level (ft
NAVD88)
Onsite Black Creek Aquifer PIW-3D 07-Dec-20 399711.752 2052088.802 19 - 24 53.315 15.76 37.56
Onsite Black Creek Aquifer PIW-4D 07-Dec-20 398817.363 2052102.819 32.3 - 37.3 53.041 10.37 42.67
Onsite Surficial Aquifer PIW-5S 07-Dec-20 398520.381 2051951.26 9.8 - 19.8 75.188 14.02 61.17
Onsite Floodplain Deposits PIW-6S 07-Dec-20 398118.144 2052540.567 18 - 28 53.359 13.17 40.19
Onsite Black Creek Aquifer PIW-7D 07-Dec-20 396787.693 2052595.368 29 - 34 48.597 5.25 43.35
Onsite Floodplain Deposits PIW-7S 07-Dec-20 396786.995 2052589.486 7 - 17 48.392 4.97 43.42
Onsite Black Creek Aquifer PIW-8D 07-Dec-20 396403.378 2052682.019 35.5 - 45.5 48.518 6.97 41.55
Onsite Black Creek Aquifer PIW-9D 07-Dec-20 396155.974 2052250.911 40 - 45 79.529 37.04 42.49
Onsite Surficial Aquifer PIW-9S 07-Dec-20 396148.111 2052251.101 24.8 - 29.8 79.532 28.72 50.81
Onsite Perched Zone PW-01 07-Dec-20 399064.799 2049654.303 11 - 21 149.547 13.83 135.72
Onsite Surficial Aquifer PW-02 07-Dec-20 399779.064 2050649.466 50 - 60 146.431 56.44 89.99
Onsite Surficial Aquifer PW-03 07-Dec-20 397339.809 2050765.319 35 - 45 147.967 41.77 106.2
Onsite Surficial Aquifer PW-04 07-Dec-20 394659.549 2050940.657 17 - 27 97.751 22.94 74.81
Onsite Surficial Aquifer PW-05 07-Dec-20 395873.1 2047812.929 65 - 75 150.336 26.77 123.57
Onsite Surficial Aquifer PW-06 07-Dec-20 392868 2045288.765 19 - 29 147.691 19.52 128.17
Onsite Surficial Aquifer PW-07 07-Dec-20 390847.706 2049258.256 28 - 38 148.16 29.56 118.6
Onsite Black Creek Aquifer PW-09 07-Dec-20 402000.079 2048979.111 44 - 54 72.925 24.45 48.47
Onsite Black Creek Aquifer PW-10R 07-Dec-20 398516.115 2051936.585 57 - 67 75.9 28.72 47.18
Onsite Black Creek Aquifer PW-11 07-Dec-20 394354.363 2052226.721 53 - 63 73.263 34.6 38.66
Onsite Black Creek Aquifer PW-12 07-Dec-20 399500.447 2047063.51 109 - 119 150.61 56.84 93.77
Onsite Black Creek Aquifer PW-13 07-Dec-20 397584.263 2048029.184 120 - 130 149.36 32.14 117.22
Onsite Black Creek Aquifer PW-14 07-Dec-20 397325.648 2050766.359 136 - 146 147.97 61.48 86.49
Onsite Black Creek Aquifer PW-15R 07-Dec-20 398900.875 2051011.753 110 - 120 136.14 69.09 67.05
Onsite Perched Zone PZ-11 07-Dec-20 398646.2549 2049820.937 15 - 20 151.03 9.46 141.57
Onsite Perched Zone PZ-13 07-Dec-20 397708.0665 2050991.731 7.1 - 12.1 149.2 10.7 138.5
Onsite Perched Zone PZ-14 07-Dec-20 397589.9185 2050618.271 9.0 - 14.0 148.38 12.02 136.36
Onsite Black Creek Aquifer PZ-22 07-Dec-20 397272.8 2052584.04 36.0 - 46.0 51.81 7.11 44.7
Onsite Perched Zone PZ-24 07-Dec-20 396117.94 2050744.07 11 - 16 147.53 13.38 134.15
Onsite Perched Zone PZ-26 07-Dec-20 396059.78 2050382.35 11 - 16 147.7 10.73 136.97
Onsite Perched Zone PZ-27 07-Dec-20 395922.11 2050376.76 12 - 17 147.17 14.01 133.16
Onsite Perched Zone PZ-28 07-Dec-20 396304.55 2049933.79 13 - 18 148.64 13.17 135.47
Onsite Perched Zone PZ-29 07-Dec-20 396371.49 2049768.94 13 - 18 147.74 14.56 133.18
Onsite Perched Zone PZ-31 07-Dec-20 396428.73 2049594.355 14 - 19 147.999 17.84 130.16
Onsite Perched Zone PZ-32 07-Dec-20 396418.471 2049713.787 13 - 18 148.471 15.55 132.92
Onsite Perched Zone PZ-33 07-Dec-20 396308.915 2049707.661 12.5 - 17.5 146.715 14.05 132.66
Onsite Perched Zone PZ-34 07-Dec-20 396292.05 2049595.039 13.5 - 18.5 147.695 15.81 131.88
Onsite Perched Zone PZ-36 07-Dec-20 396086.17 2051331.44 5 - 8.5 135.2 2.56 132.64
Onsite Perched Zone PZ-37 07-Dec-20 396042.4 2051050.05 5 - 8 135.56 2.76 132.8
Onsite Perched Zone PZ-38 07-Dec-20 395970.01 2050569.66 5 - 9 137.34 6.33 131.01
Onsite Perched Zone PZ-39 07-Dec-20 395921.87 2050238.18 5 - 10 137.93 3.67 134.26
Onsite Perched Zone PZ-40 07-Dec-20 395943.02 2050031.9 5 - 9 138.51 4.01 134.5
Onsite Perched Zone PZ-41 07-Dec-20 395979.29 2050048.97 5- 8.5 138.13 3.27 134.86
TR0795 Page 3 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 4
GROUNDWATER ELEVATIONS - DECEMBER 2020
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Area1 Water Bearing Unit2 Well ID Gauging Date3 Northing (ft, SPCS
NAD83)4
Easting (ft, SPCS
NAD83)4
Screened Interval
(ft)
TOC Elevation
(NAVD 88)5
Depth to Water
(from TOC)
Water Level (ft
NAVD88)
Onsite Perched Zone PZ-42 07-Dec-20 395961.73 2050230.23 3 - 7 138.17 3.4 134.77
Onsite Perched Zone PZ-43 07-Dec-20 396011.61 2050567.89 5 - 9 137.06 4.33 132.73
Onsite Perched Zone PZ-44 07-Dec-20 396082.75 2051045.25 5 - 7 136.26 2.99 133.27
Onsite Perched Zone PZ-45 07-Dec-20 396124.41 2051323.03 2 - 4 135.69 2.5 133.19
Onsite Surficial Aquifer PZ-L 07-Dec-20 396745.804 2048684.008 13-28 147.86 30.04 117.82
Onsite Surficial Aquifer SMW-01 07-Dec-20 395295.7504 2043679.192 5.0 - 15.0 136.81 11.91 124.9
Onsite Perched Zone SMW-02 07-Dec-20 399983.7529 2050654.772 5.0 - 20.0 147.93 11.38 136.55
Onsite Surficial Aquifer SMW-02B 07-Dec-20 399983.478 2050660.475 43.0 - 53.0 145.211 56.01 89.2
Onsite Perched Zone SMW-03 07-Dec-20 399778.25 2049445.96 10.0 - 20.0 151.094 NM --
Onsite Black Creek Aquifer SMW-03B 07-Dec-20 399785.752 2049421.539 72 - 82 150.43 56.59 93.84
Onsite Perched Zone SMW-04A 07-Dec-20 399668.71 2048387.57 19.5 - 34.5 148.09 NM --
Onsite Surficial Aquifer SMW-04B 07-Dec-20 399667.1219 2048390.301 43.0 - 53.0 148.372 45.11 103.26
Onsite Perched Zone SMW-05 07-Dec-20 399334.0651 2048557.335 10.0 - 20.0 148.099 22.9 125.2
Onsite Surficial Aquifer SMW-05P 07-Dec-20 399338.61 2048559.26 45.0 - 60.0 149.32 43.82 105.5
Onsite Perched Zone SMW-06 07-Dec-20 399172.346 2048759.478 12.0 - 22.0 150.97 NM --
Onsite Surficial Aquifer SMW-06B 07-Dec-20 399144.744 2048764.939 58 - 68 150.32 47.1 103.22
Onsite Perched Zone SMW-07 07-Dec-20 398932.907 2048611.163 13.0 - 23.0 147.64 19.49 128.15
Onsite Perched Zone SMW-08 07-Dec-20 399064.972 2048468.783 21.0 - 31.0 151.017 NM --
Onsite Surficial Aquifer SMW-08B 07-Dec-20 399058.325 2048478.84 58 - 68 148.81 40.55 108.26
Onsite Surficial Aquifer SMW-09 07-Dec-20 401076.889 2050017.409 52 - 62 141.43 55.52 85.91
Onsite Black Creek Aquifer SMW-10 07-Dec-20 402307.305 2047923.84 39 - 49 76.26 28.89 47.37
Onsite Surficial Aquifer SMW-11 07-Dec-20 401996.154 2048975.382 13 - 23 71.95 12.37 59.58
Onsite Black Creek Aquifer SMW-12 07-Dec-20 401314.202 2051007.222 88 - 98 118.22 82.21 36.01
Onsite Perched Zone PZ-12 08-Dec-20 399094.958 2048981.781 15.1 - 20.1 150.91 18.91 132
Onsite Perched Zone PZ-15 08-Dec-20 396805.0927 2050112.022 10.2 - 15.2 148.79 12.94 135.85
Onsite Perched Zone PZ-17 08-Dec-20 396614.815 2048872.689 21.1 - 26.1 150.08 28.23 121.85
Onsite Perched Zone PZ-19R 08-Dec-20 397998.663 2049919.516 16 - 21 150.046 12.91 137.14
Onsite Perched Zone PZ-20R 08-Dec-20 398185.809 2049784.598 15 - 20 151.29 14.22 137.07
Onsite Perched Zone PZ-21R 08-Dec-20 398445.157 2049883.125 17 - 22 150.674 12.05 138.62
Onsite Perched Zone PZ-35 08-Dec-20 398232.643 2050020.494 13 - 18 150.43 12.36 138.07
Offsite Black Creek Aquifer BLADEN-1D 07-Dec-20 387522.245 2050247.399 37 - 47 76.96 19.28 57.68
Offsite Surficial Aquifer BLADEN-1S 07-Dec-20 387518.967 2050233.347 5 - 10 76.74 9.55 67.19
Offsite Black Creek Aquifer BLADEN-2D 07-Dec-20 368827.094 2042878.344 70 - 75 138.27 16.72 121.55
Offsite Surficial Aquifer BLADEN-2S 07-Dec-20 368821.463 2042882.917 10 - 20 138.04 3.55 134.49
Offsite Black Creek Aquifer BLADEN-4D 07-Dec-20 363255.115 2087636.869 46.75 - 51.75 59.66 0.4 59.26
Offsite Surficial Aquifer BLADEN-4S 07-Dec-20 363263.191 2087637.461 4.75 - 14.75 59.68 4.97 54.71
Offsite Black Creek Aquifer CUMBERLAND-1D 07-Dec-20 431459.947 2011071.39 40 - 50 174.6 2.9 171.7
Offsite Surficial Aquifer CUMBERLAND-1S 07-Dec-20 431459.947 2011071.39 15 - 25 174.73 2.77 171.96
Offsite Black Creek Aquifer CUMBERLAND-2D 07-Dec-20 449987.54 2074019.139 47 - 57 129.23 3.07 126.16
Offsite Surficial Aquifer CUMBERLAND-2S 07-Dec-20 449979.1 2074020.858 7 - 17 129.06 3 126.06
Offsite Black Creek Aquifer CUMBERLAND-3D 07-Dec-20 423248.115 2060409.157 22 - 27 78.79 6.22 72.57
Offsite Surficial Aquifer CUMBERLAND-3S 07-Dec-20 423254.641 2060413.302 9 - 14 79.063 6.54 72.52
TR0795 Page 4 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 4
GROUNDWATER ELEVATIONS - DECEMBER 2020
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Offsite Black Creek Aquifer CUMBERLAND-4D 07-Dec-20 413095.774 2078249.953 57 - 67 119.22 11.15 108.07
Area1 Water Bearing Unit2 Well ID Gauging Date3 Northing (ft, SPCS
NAD83)4
Easting (ft, SPCS
NAD83)4
Screened Interval
(ft)
TOC Elevation
(NAVD 88)5
Depth to Water
(from TOC)
Water Level (ft
NAVD88)
Offsite Surficial Aquifer CUMBERLAND-4S 07-Dec-20 413086.626 2078255.528 10 - 20 119.362 6 113.36
Offsite Black Creek Aquifer CUMBERLAND-5D 07-Dec-20 405673.8152 2138069.537 52 - 57 NM 7.51 99.16
Offsite Surficial Aquifer CUMBERLAND-5S 07-Dec-20 405673.8152 2138069.537 14 - 24 NM 2.65 104
Offsite Black Creek Aquifer ROBESON-1D 07-Dec-20 381416.282 2020158.933 42.75 - 52.75 156.36 8.8 147.56
Offsite Surficial Aquifer ROBESON-1S 07-Dec-20 381408.19 2020156.855 17 - 27 156.66 5.81 150.85
Offsite Black Creek Aquifer BLADEN-3D 08-Dec-20 396856.978 2059006.562 33.75 - 43.75 75.52 8.92 66.6
Offsite Surficial Aquifer BLADEN-3S 08-Dec-20 396862.307 2059012.932 5 - 15 74.27 7.09 67.18
Notes:
1 - Area - refers to location of well within site property boundary (“Onsite”) and outside property boundary (“Offsite”).
2 - Water Bearing Unit - refers to primary aquifer unit well screen is estimated to be screened within.
3 - Northing and Easting provided in North Carolina State Plane System (zone 3200), North American Datum 1983.
4 - Vertical datum is North American Vertical Datum of 1988.
-- - not calculated because the well was either not measured or dry
NM - not measured
ft - feet
NAVD88 - North American Vertical Datum of 1988
SPCS NAD83 - State Plane Coordinate System North American Datum 1983
TOC - top of casing
TR0795 Page 5 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 5SEEP AND SURFACE WATER FIELD PARAMETERS Chemours Fayetteville Works, North CarolinaGeosyntec Consultants of NC P.C.LocationDatepH (S.U.)Dissolved Oxygen (mg/L)Oxidation Reduction Potential (mV)Turbidity (NTU)Specific Conductivity (µS/cm)Temperature (°C)SEEP A12/16/2020 6.1 6.6154222868.4SEEP B12/16/2020 5.0 118251108.4SEEP C12/16/2020 8.5 7.210449217 10.5SEEP D12/16/2020 3.9 8.72460150 12.6CFR-BLADEN 12/15/2020 7.3 1013820116 10.6CFR-KINGS12/16/2020 7.7 9.76.916432 10.0CFR-RM-7612/15/2020 7.9 10-11223189.1CFR-TARHEEL 12/15/2020 7.6 109822127 10.5CFR-TARHEEL 12/16/2020 8.0 7.7125146 11.5GBC-112/15/2020 6.3 9.01915231 11.3INTAKE AT FACILITY 12/16/2020 7.5 1034625100 11.4LOCK-DAM-SEEP 12/15/2020 6.4 8.988371679.5LOCK-DAM-SEEP-NORTH 12/15/2020 NS NSNSNSNSNSOLDOF-112/15/2020 5.5 1015853239 12.5OUTFALL 002 12/16/2020 6.7 1027115171 14.2WC-112/16/2020 6.9 118231167.1Abbreviations:°C - degrees Celsiusmg/L - milligrams per literµS/cm - microsiemens per centimetermV- millivoltsNTU - Nephelometric Turbidity UnitsS.U. - Standard UnitsNS - not sampledTR0795Page 1 of 1March 2021DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 6GROUNDWATER FIELD PARAMETERS Chemours Fayetteville Works, North CarolinaGeosyntec Consultants NC, P.C.Location DatepH (S.U.)Dissolved Oxygen (mg/L)Oxidation Reduction Potential (mV)Turbidity (NTU)Specific Conductance (µS/cm)Temperature (oC)Bladen-1D NS NS NS NSNSNSNSLTW-01 12/10/2020 3.9 0.2 189012218.5LTW-02 12/10/2020 4.9 0.1 -15.907317.7LTW-03 12/22/2020 4.5 0.3 15937917.7LTW-04 12/8/2020 4.6 0.3 11607511.8LTW-05 12/9/2020 4.3 0.1 45.3710516.3PIW-1D 12/10/2020 3.6 0.1 212716517.1PIW-1S 12/10/2020 4.1 1.4 275224016.8PIW-3D 12/11/2020 4.6 0.1 -7619316.9PIW-7D 12/8/2020 4.4 0.1 -3757215.1PIW-7S 12/8/2020 5.4 0.1 -82410015.9PW-04 12/8/2020 3.3 0.1 398535816.8PW-06 12/8/2020 4.6 2.66404916.5PW-07 12/9/2020 4.9 7.3 25803519.1PW-09 12/8/2020 11 2.084224213.3PW-11 12/22/2020 NS NS NSNSNSNSPZ-22 12/9/2020 4.5 0.1 36.339815.3SMW-10 12/9/2020 5.4 0.1 -7058116.4SMW-11 12/8/2020 4.0 4.9 14104416.6SMW-12 12/9/2020 3.7 0.9 -19023316.6Notes:> - greater than°C - degrees Celsiusmg/L - milligrams per literµS/cm - microsiemens per centimetermV- millivoltsNTU - nephelometric Turbidity UnitS.U. - Standard UnitsNS - not sampledTR0795Page 1 of 1March 2021DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event Q1 2020 Q1 2020 Q1 2020 Q1 2020
Location ID CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
Field Sample ID CFR-TARHEEL-83-033120 CFR-TARHEEL-83-033120-D CAP1Q20-CFR-TARHEEL-040220 CFR-TARHEEL-48-040220
Sample Date 3/31/2020 3/31/2020 4/2/2020 4/2/2020
Sample Type Composite Composite Grab Composite
Sample Start Date and Time 3/28/20 1:00 AM 3/28/20 1:00 AM -3/31/20 1:00 PM
Sample Stop Date and Time 3/31/20 12:00 PM 3/31/20 12:00 PM -4/2/20 1:00 PM
Composite Duration (hours)83 83 -48
QA/QC Field Duplicate
Sample Delivery Group (SDG)320-60098-1 320-60098-1 320-60029-1 320-60098-1
Lab Sample ID 320-60098-1 320-60098-2 320-60029-3 320-60098-3
Table 3+ SOP (ng/L)
Hfpo Dimer Acid <15 6.3 11 10
PFMOAA 26 29 35 42
PFO2HxA 9.3 8.9 15 14
PFO3OA 2.1 <2 3.9 3.3
PFO4DA <2 <2 <2 <2
PFO5DA <2 <2 <2 <2
PMPA 15 12 24 17
PEPA <20 <20 <20 <20
PS Acid <2 <2 <2 <2
Hydro-PS Acid <2 <2 <2 <2
R-PSDA <2 <2 8.5 7.9
Hydrolyzed PSDA 8.2 J 8.4 J 26 14 J
R-PSDCA <2 <2 <2 <2
NVHOS <2 <2 2.3 <2
EVE Acid <2 <2 <2 <2
Hydro-EVE Acid <2 <2 <2 <2
R-EVE 2.1 J <2 6.6 <2
PES <2 <2 <2 <2
PFECA B <2 <2 <2 <2
PFECA-G <2 <2 <2 <2
Perfluoroheptanoic Acid 16 J 13 J 12 12
Total Attachment C1 52 56 89 86
Total Table 3+ (17 compounds)2 52 56 91 86
Total Table 3+ (20 compounds)63 65 130 110
TR0795 Page 1 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q1 2020 Q1 2020 Q1 2020 Q1 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CAP1Q20-CFR-TARHEEL-24-040320 CFR-TARHEEL-83-040620 CFR-TARHEEL-79-040920 CFR-TARHEEL-83-041920
4/3/2020 4/6/2020 4/9/2020 4/19/2020
Composite Composite Composite Composite
4/2/20 3:00 PM 4/2/20 1:30 PM 4/5/20 11:32 PM 4/15/20 2:30 PM
4/3/20 3:00 PM 4/6/20 12:30 AM 4/9/20 6:30 AM 4/19/20 1:30 AM
24 83 79 83
320-60032-1 320-60098-1 320-60195-1 320-60435-1
320-60032-2 320-60098-4 320-60195-1 320-60435-1
18 17 20 5.5
47 56 94 28
21 22 33 11
4.8 5.5 8.1 2.6
<2 <2 2.8 <2
<2 <2 4.9 6.9
31 24 31 17
<20 <20 <20 <20
<2 <2 <2 <2
<2 <2 <2 <2
14 J 11 13 <2
17 B 20 J 31 9.6
<2 <2 <2 <2
<2 2.1 5 <2
<2 <2 <2 <2
<2 <2 <2 <2
2.8 J <2 3.4 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
11 8.5 ----
120 120 190 71
120 130 200 71
160 160 250 81
TR0795 Page 2 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q1 2020 Q1 2020 Q1 2020 Q1 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-83-042220 CFR-TARHEEL-83-042620 CFR-TARHEEL-83-042920 CFR-TARHEEL-62-050220
4/22/2020 4/26/2020 4/29/2020 5/2/2020
Composite Composite Composite Composite
4/19/20 2:30 AM 4/22/20 1:49 PM 4/26/20 12:49 AM 4/30/20 9:49 AM
4/22/20 1:30 PM 4/26/20 12:49 AM 4/29/20 11:49 AM 5/2/20 11:49 PM
83 83 83 62
320-60435-1 320-60619-1 320-60619-1 320-60763-1
320-60435-2 320-60619-1 320-60619-2 320-60763-1
12 11 13 12
51 53 59 27
19 19 24 16
5.1 4.8 5.8 3.5
<2 <2 <2 <2
5.5 <2 <2 <2
25 21 23 24
<20 <20 <20 <20
<2 <2 <2 <2
<2 <2 <2 <2
<2 7.5 13 20
17 23 27 18
<2 <2 <2 <2
<2 2.8 3.9 3.3
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 2.4 6
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
120 110 120 83
120 110 130 86
130 140 170 130
TR0795 Page 3 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q1 2020 Q2 2020 Q2 2020 Q2 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-83-050620 CFR-TARHEEL-83-051120 CFR-TARHEEL-83-051320 CAP2Q20-CFR-TARHEEL-051420
5/6/2020 5/11/2020 5/13/2020 5/14/2020
Composite Composite Composite Grab
5/3/20 12:49 AM 5/6/20 12:49 PM 5/9/20 11:49 PM -
5/6/20 11:49 AM 5/9/20 11:49 PM 5/13/20 9:49 AM -
83 83 83 -
320-60763-1 320-60789-1 410-2522-1 320-60921-1
320-60763-2 320-60789-1 410-2522-1 320-60921-3
6.2 9.4 13 J 24
18 34 69 75
9.8 14 27 34
2.1 3.8 6.7 8.9
<2 <2 2 J 2.4
<2 <2 <2 <2
15 18 22 49
<20 <20 <20 <20
<2 <2 <2 UJ <2
<2 <2 <2 UJ <2
11 13 12 J 33
12 15 34 J 30
<2 <2 <2 <2
<2 2.3 2.9 4.6
<2 <2 <2 <2
<2 <2 <2 <2
<2 2.7 5.2 J 5.6
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
------9.8
51 79 140 190
51 82 140 200
74 110 190 270
TR0795 Page 4 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q2 2020 Q2 2020 Q2 2020 Q2 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CAP2Q20-TARHEEL-24-051420 CFR-TARHEEL-83-051620 CFR-TARHEEL-83-052020 CFR-TARHEEL-052520
5/14/2020 5/16/2020 5/20/2020 5/25/2020
Composite Composite Composite Grab
5/13/20 9:50 PM 5/13/20 9:49 AM 5/16/20 9:49 PM -
5/14/20 8:50 PM 5/16/20 7:49 PM 5/20/20 8:49 AM -
24 83 83 -
410-2521-1 410-2522-1 410-2522-1 320-61296-1
410-2521-4 410-2522-2 410-2522-3 320-61296-2
23 19 J 25 2
88 94 120 <5
33 37 45 2.2
8.6 8.2 10 <2
2.5 J 2.5 J 3 <2
<2 <2 <2 <2
28 27 32 <10
<20 <20 20 <20
<2 UJ <2 UJ 2.2 J <2
<2 UJ <2 UJ <2 UJ <2
16 J 15 J 15 J <2
46 J 47 J 54 J 3.4
<2 <2 <2 <2
4.8 4.4 3.8 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.9 J 6.3 J 8.1 J 2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
6.7 ------
180 190 260 4.2
190 190 260 4
250 260 340 9.6
TR0795 Page 5 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q2 2020 Q2 2020 Q2 2020 Q2 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-052920 CFR-TARHEEL-060120 CFR-TARHEEL-060120-D CFR-TARHEEL-060520
5/29/2020 6/1/2020 6/1/2020 6/5/2020
Grab Grab Grab Grab
----
----
----
Field Duplicate
320-61296-1 320-61452-1 320-61452-1 320-61570-1
320-61296-1 320-61452-1 320-61452-2 320-61570-1
4.5 <2 2 4.6
<5 6.1 5.3 9
6.5 3.1 3.2 6.5
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<10 <13 <13 27
<20 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 2.6 <2 <2
<2 2.9 2.6 5.5
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
11 9.2 11 47
11 9 11 47
11 15 13 53
TR0795 Page 6 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q2 2020 Q2 2020 Q2 2020 Q2 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-39-060820 CFR-TARHEEL-83-061220 CFR-TARHEEL-83-061520 CFR-TARHEEL-83-061920
6/8/2020 6/12/2020 6/15/2020 6/19/2020
Composite Composite Composite Composite
6/5/20 11:06 AM 6/8/20 10:06 PM 6/12/20 9:06 AM 6/15/20 8:06 PM
6/8/20 9:06 PM 6/12/20 8:06 AM 6/15/20 7:06 PM 6/19/20 6:06 AM
39 83 83 83
320-61852-1 320-61852-1 320-62010-1 320-62010-1
320-61852-1 320-61852-2 320-62010-1 320-62010-2
6.5 10 15 16
9.8 17 J 14 11
8.3 13 13 18
<2 3.4 3 3.8
<2 <2 <2 <2
<2 <2 <2 <2
17 25 27 36
<2 3.2 3.2 5.4
3.4 <2 <2 <2
<2 <2 <2 <2
5.9 8.5 J 4.7 5.1
7.2 9.1 J 8 7.2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 3.8 J <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
45 72 75 90
45 72 75 90
58 93 88 100
TR0795 Page 7 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q2 2020 Q2 2020 Q2 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-83-062220 CFR-TARHEEL-83-062620 CFR-TARHEEL-83-062920 CFR-TARHEEL-65-070220
6/22/2020 6/26/2020 6/29/2020 7/2/2020
Composite Composite Composite Composite
6/19/20 7:06 AM 6/22/20 6:06 PM 6/26/20 5:06 AM 6/29/20 4:06 PM
6/22/20 5:06 PM 6/26/20 4:06 AM 6/29/20 3:06 PM 7/2/20 8:06 AM
83 83 83 65
320-62127-1 320-62407-1 320-62407-1 320-62407-1
320-62127-1 320-62407-1 320-62407-2 320-62407-3
5.8 9.9 15 19
4.9 30 49 <2
8 13 18 25
<2 2.8 4 5.5
<2 <2 <2 2.5 J
<2 <2 <2 <2
21 20 26 27
<2 3.2 4.5 5.2
<2 <2 <2 <2
<2 <2 <2 <2
5.6 11 15 4.2
4.1 12 17 12
<2 <2 <2 <2
<2 <2 2.5 3.1
<2 <2 <2 <2
<2 <2 <2 <2
<2 3.5 4.9 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
40 79 120 84
40 79 120 87
49 110 160 100
TR0795 Page 8 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-070320 CFR-TARHEEL-24-070720 CFR-TARHEEL-24-071020 CFR-TARHEEL-24-071020-D
7/3/2020 7/7/2020 7/10/2020 7/10/2020
Composite Composite Composite Composite
7/2/20 8:29 AM 7/6/20 8:29 AM 7/9/20 12:01 PM 7/9/20 12:01 PM
7/3/20 7:29 AM 7/7/20 7:29 AM 7/10/20 11:01 AM 7/10/20 11:01 AM
24 24 24 24
Field Duplicate
320-62486-1 320-62486-1 320-62645-1 320-62645-1
320-62486-2 320-62486-1 320-62645-1 320-62645-2
19 19 15 15
60 97 77 78
26 31 25 28
5.6 6.7 5.2 5.9
2 3 <2 <2
<2 <2 <2 <2
39 30 26 27
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
22 23 12 12
28 34 32 34
<2 <2 <2 <2
3.3 4.5 3.4 3
<2 <2 <2 <2
<2 <2 <2 <2
6.1 5.9 4.3 5.8
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
150 190 150 150
150 190 150 160
210 250 200 210
TR0795 Page 9 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-071320 CFR-TARHEEL-24-071620 CFR-TARHEEL-24-072020 CFR-TARHEEL-24-072320
7/13/2020 7/16/2020 7/20/2020 7/23/2020
Composite Composite Composite Composite
7/13/20 12:01 AM 7/16/20 12:01 AM 7/20/20 12:01 AM 7/23/20 12:01 AM
7/13/20 11:01 PM 7/16/20 11:01 PM 7/20/20 11:01 PM 7/23/20 11:01 PM
24 24 24 24
320-62689-1 320-62879-1 320-63057-1 320-63287-1
320-62689-1 320-62879-1 320-63057-1 320-63287-1
16 20 26 20
60 76 100 67
28 31 29 29
6.9 6.5 9.4 6.6
2.8 2.4 4.8 2.6
<2 <2 2.7 2
27 29 <20 24
<10 <10 <10 <10
2.3 <2 2.7 <2
<2 <2 <2 <2
22 13 <2 17
32 24 <2 29
<2 <2 <2 <2
3.3 3.5 3.4 4.4
<2 <2 <2 <2
<2 <2 <2 <2
6 3.9 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--------
140 160 170 150
150 170 180 160
210 210 180 200
TR0795 Page 10 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-12-072720 CAP3Q20-CFR-TARHEEL-072820 CAP3Q20-CFR-TARHEEL-24-072920 CFR-TARHEEL-24-073020
7/27/2020 7/28/2020 7/29/2020 7/30/2020
Composite Grab Composite Composite
7/27/20 12:01 AM -7/29/20 12:01 AM 7/30/20 12:01 AM
7/27/20 11:01 AM -7/29/20 11:01 PM 7/30/20 11:01 PM
12 -24 24
320-63287-1 320-63225-2 320-63304-2 320-63442-1
320-63287-2 320-63225-1 320-63304-1 320-63442-1
14 14 J 14 11
41 39 54 41
19 19 21 18
3.9 4.4 5.2 5
<2 <2 <2 2.7
<2 <2 <2 <2
<20 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
12 <2 <2 <2
14 <2 20 18
<2 <2 <2 <2
3.5 2.9 2.8 3.4
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
--3.7 3.1 3.2
78 76 94 78
81 79 97 81
110 79 120 99
TR0795 Page 11 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-080320 CFR-TARHEEL-080420 CFR-TARHEEL-24-080620 CFR-TARHEEL-24-081020
8/3/2020 8/4/2020 8/6/2020 8/10/2020
Grab Grab Composite Composite
--8/5/20 11:55 PM 8/9/20 10:38 PM
--8/6/20 10:55 PM 8/10/20 9:56 PM
--24 24
320-63442-1 320-63442-1 320-63737-1 320-63737-1
320-63442-2 320-63442-3 320-63737-1 320-63737-2
15 44 4.8 7.8
48 47 8.1 <2
23 37 8.1 20
5.4 10 <2 6
2.3 4.3 <2 2.2
<2 <2 <2 <2
21 45 <20 <20
<10 12 <10 <10
<2 4.6 <2 <2
<2 2.9 <2 <2
<2 <2 <2 <2
21 32 2.5 <2
<2 <2 <2 <2
2.7 2.4 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.8 4.9 2.6 4.6
110 210 21 36
120 210 21 36
140 240 24 36
TR0795 Page 12 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-081220 CFR-TARHEEL-24-081720 CFR-TARHEEL-24-082020 CFR-TARHEEL-24-082520
8/12/2020 8/17/2020 8/20/2020 8/25/2020
Composite Composite Composite Composite
8/12/20 12:01 AM 8/17/20 12:01 AM 8/20/20 12:01 AM 8/25/20 12:01 AM
8/12/20 11:01 PM 8/17/20 11:01 PM 8/20/20 11:01 PM 8/25/20 11:01 PM
24 24 24 24
320-63779-1 320-64174-1 320-64174-1 320-64174-1
320-63779-1 320-64174-5 320-64174-6 320-64174-1
5.8 3.4 6.2 7.1
27 15 26 33
11 6.2 12 15
2.1 <2 2.3 3
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
7.4 3.8 6.1 <2
15 6.4 11 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
3.9 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
3.8 2.5 2.8 3.5
46 25 47 58
46 25 47 58
72 35 64 58
TR0795 Page 13 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-082720 CFR-TARHEEL-082720-D CFR-TARHEEL-083120 CFR-TARHEEL-24-090320
8/27/2020 8/27/2020 8/31/2020 9/3/2020
Grab Grab Grab Composite
---9/3/20 12:01 AM
---9/3/20 11:01 PM
---24
Field Duplicate
320-64174-1 320-64174-1 320-64174-1 320-64517-1
320-64174-2 320-64174-3 320-64174-4 320-64517-1
12 12 18 7.8
63 64 100 21
24 24 35 12
5.3 5.6 7.8 3.4
2 <2 2.8 <2
<2 <2 <2 <2
23 23 31 <20
<10 <10 <10 <10
<2 <2 2.7 <2
<2 <2 <2 <2
<2 UJ 8 J 11 3.4
22 23 38 8.6
<2 <2 <2 <2
<2 <2 2.7 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 2.9 4.7 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
3.7 4 5.6 2.5
130 130 200 44
130 130 200 44
150 160 250 56
TR0795 Page 14 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-090720 CFR-TARHEEL-24-091020 CFR-TARHEEL-24-091420 CFR-TARHEEL-24-091720
9/7/2020 9/10/2020 9/14/2020 9/17/2020
Composite Composite Composite Composite
9/7/20 12:01 AM 9/10/20 12:01 AM 9/14/20 12:01 AM 9/17/20 12:01 AM
9/7/20 11:01 PM 9/10/20 11:01 PM 9/14/20 11:01 PM 9/17/20 11:01 PM
24 24 24 24
320-64517-1 320-64776-1 320-64776-1 320-64846-1
320-64517-2 320-64776-1 320-64776-2 320-64846-1
12 26 18 25
26 55 36 <2
17 31 25 32
4.2 7.3 5.3 7.2
<2 2.1 <2 2.7
<2 <2 <2 <2
<20 30 <20 33
<10 <10 <10 <10
<2 3.7 <2 2
<2 <2 <2 2.8
<2 14 4.2 9.7
15 41 24 29
<2 <2 <2 <2
<2 3 4 5.8
<2 <2 <2 <2
<2 <2 <2 <2
<2 6.3 <2 3.2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
2.3 5.5 4.8 5
59 160 84 100
59 160 88 110
74 220 120 150
TR0795 Page 15 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-11-091820 CFR-TARHEEL-24-092120 CFR-TARHEEL-24-092420 CFR-TARHEEL-24-092420-2
9/18/2020 9/21/2020 9/24/2020 9/24/2020
Composite Composite Composite Composite
9/18/20 12:01 AM 9/21/20 12:01 AM 9/24/20 12:01 AM 9/24/20 12:01 AM
9/18/20 10:01 AM 9/21/20 11:01 PM 9/24/20 11:01 PM 9/24/20 11:01 PM
11 24 24 24
320-64920-1 320-65132-1 320-65132-1 320-65132-1
320-64920-1 320-65132-1 320-65132-2 320-65132-2
42 7.3 11 11
<2 7.9 14 14
39 8.7 9.8 9.8
9 <2 2.9 2.9
4.2 <2 <2 <2
<2 <2 <2 <2
46 34 31 31
11 <10 <10 <10
8.3 <2 <2 <2
4.3 <2 <2 <2
52 <2 <2 <2
47 9.4 11 11
<2 <2 <2 <2
5.7 <2 <2 <2
2.4 <2 <2 <2
<2 <2 <2 <2
7.5 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.3 4.1 J 5.6 J 5.6 J
160 58 69 69
170 58 69 69
280 67 80 80
TR0795 Page 16 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q3 2020 Q3 2020 Q3 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-092520 CFR-TARHEEL-24-092620 CFR-TARHEEL-24-092820 CFR-TARHEEL-24-092920
9/25/2020 9/26/2020 9/28/2020 9/29/2020
Composite Composite Composite Composite
9/25/20 12:01 AM 9/26/20 12:01 AM 9/28/20 12:01 AM 9/29/20 12:01 AM
9/25/20 11:01 PM 9/26/20 11:01 PM 9/28/20 11:01 PM 9/29/20 11:01 PM
24 24 24 24
320-65132-1 320-65132-1 320-65188-1 320-65521-1
320-65132-3 320-65132-4 320-65188-1 320-65521-1
11 12 6.1 5.3
12 8.8 6.3 4.1
12 13 6.2 6.8
2.9 2.6 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
32 34 32 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
14 13 7.1 5.4
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
5.7 J 5.1 J 3.4 J 3.9
70 70 51 16
70 70 51 16
84 83 58 22
TR0795 Page 17 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q3 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-093020 CFR-TARHEEL-18-100120 CFR-TARHEEL-9-100620 CFR-TARHEEL-24-100820
9/30/2020 10/1/2020 10/6/2020 10/8/2020
Composite Composite Composite Composite
9/30/20 12:01 AM 10/1/2020 0:01 10/6/20 14:30 10/7/2020 17:30
9/30/20 11:01 PM 10/1/2020 17:01 10/6/20 23:30 10/8/2020 16:30
24 18 9 24
320-65283-1 320-65521-1 320-65521-1 320-65521-1
320-65283-1 320-65521-2 320-65521-3 320-65521-4
11 5.3 8.1 13
23 2.9 3.9 7.4
12 6.6 9.9 15
2.5 <2 2.1 3.6
<2 <2 <2 <2
<2 <2 <2 <2
25 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
7.4 <2 <2 <2
12 <2 5.1 7.6
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
2.9 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.9 5.5 5.4 5.5
74 15 24 39
74 15 24 39
96 15 29 47
TR0795 Page 18 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-101220 CFR-TARHEEL-24-101520 CFR-TARHEEL-24-101920 CFR-TARHEEL-24-102220
10/12/2020 10/15/2020 10/19/2020 10/22/2020
Composite Composite Composite Composite
10/12/2020 0:01 10/15/2020 0:01 10/19/2020 0:01 10/22/2020 0:01
10/12/2020 23:01 10/15/2020 23:01 10/19/2020 23:01 10/22/2020 23:01
24 24 24 24
320-65571-1 320-65803-1 320-65803-1 320-66072-1
320-65571-1 320-65803-1 320-65803-2 320-66072-1
23 4.5 6 7.2
54 15 18 7
30 6.9 7.6 8.3
13 <2 <2 <2
7.9 <2 <2 <2
3.5 <2 <2 <2
33 <20 <20 28
<10 <10 <10 <10
2.2 <2 <2 <2
<2 <2 <2 <2
20 3.4 4.1 <2
21 5 6.2 <2
<2 <2 <2 <2
3.1 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.7 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4 3.8 5.5 5.1
170 26 32 51
170 26 32 51
220 35 42 51
TR0795 Page 19 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-12-103020 CFR-TARHEEL-24-103120 CFR-TARHEEL-24-110220 CFR-TARHEEL-24-110520
10/30/2020 10/31/2020 11/2/2020 11/5/2020
Composite Composite Composite Composite
10/30/2020 12:01 10/31/2020 0:01 11/2/2020 0:01 11/5/20 0:01
10/30/20 23:01 10/31/20 23:01 11/2/2020 23:01 11/5/20 23:01
24 24 24 24
320-66384-1 320-66384-1 320-66384-1 320-66511-1
320-66384-1 320-66384-2 320-66384-3 320-66511-1
11 8.8 7 5.9
29 27 15 22
13 11 8.5 9.3
3.1 2.5 <2 2.2
<2 <2 <2 <2
<2 <2 <2 <2
<20 21 20 26
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
11 J 9.1 J <2 <2
8.5 6.1 3.9 5.2
<2 <2 <2 <2
3.5 3.8 3.3 <2
<2 <2 <2 <2
<2 <2 <2 <2
2.8 J 2.2 J <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.5 4.9 6 4.9
56 70 51 65
60 74 54 65
82 92 58 71
TR0795 Page 20 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-110920 CFR-TARHEEL-24-111120 CFR-TARHEEL-20-111220 CFR-TARHEEL-111320
11/9/2020 11/11/2020 11/12/2020 11/13/2020
Composite Composite Composite Grab
11/9/2020 0:01 11/11/2020 0:01 11/12/2020 0:01 --
11/9/2020 23:01 11/11/2020 23:01 11/12/2020 19:01 --
24 24 20 --
320-66794-1 320-66794-1 320-66794-1 320-67088-1
320-66794-1 320-66794-2 320-66794-3 320-67088-1
12 J 14 46 2.8
35 J 38 48 <2
17 J 18 45 3.3
3.9 J 3.6 11 <2
<2 UJ <2 7.3 <2
<2 UJ <2 5.3 <2
22 J <20 52 <20
<10 UJ <10 16 <10
<2 UJ <2 2.6 <2
<2 UJ <2 2.9 <2
16 J 16 39 <2
14 J 15 21 <2
<2 UJ <2 <2 <2
2.8 J 3.8 3.3 <2
<2 UJ <2 2.1 <2
<2 UJ <2 <2 <2
3.4 J 3.9 11 <2
<2 UJ <2 <2 <2
<2 UJ <2 <2 <2
<2 UJ <2 <2 <2
4.2 J 3.8 3.6 3.1
90 74 240 6.1
93 77 240 6.1
130 110 310 6.1
TR0795 Page 21 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL3 CFR-TARHEEL
CFR-TARHEEL-111820 CFR-TARHEEL-112020 CFR-TARHEEL-24-112420 CFR-TARHEEL-24-112420 CFR-TARHEEL-24-112620
11/18/2020 11/20/2020 11/24/2020 11/24/2020 11/26/2020
Grab Grab Composite Composite Composite
----11/24/2020 0:01 11/24/2020 0:01 11/26/2020 0:01
----11/24/2020 23:01 11/24/2020 23:01 11/26/2020 23:01
----24 24 24
320-67088-1 320-67088-1 320-67335-1 320-67335-2 320-67335-1
320-67088-2 320-67088-3 320-67335-1 320-67335-1 320-67335-2
6 6.1 <2 7.2 J 100
8.1 10 <2 18 J 23 J
7.7 7.5 2.3 6.1 J 100
<2 <2 <2 <2 UJ 14
<2 <2 <2 <2 UJ 13
<2 <2 <2 <2 UJ <2
<20 <20 <20 <20 UJ 92
<10 <10 <10 <10 UJ 27
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ 8
6.2 7.1 <2 3.3 J 5.5
2.5 4.9 <2 3.5 J <2
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ 3
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ <2
<2 <2 <2 <2 UJ <2
2.6 3.3 <2 4.5 J 2.9
22 24 2.3 31 380
22 24 2.3 31 380
31 36 2.3 38 390
TR0795 Page 22 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL3 CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-112620 CFR-TARHEEL-24-113020 CFR-TARHEEL-24-120320 CFR-TARHEEL-24-120720 CFR-TARHEEL-24-121020
11/26/2020 11/30/2020 12/3/2020 12/7/2020 12/10/2020
Composite Composite Composite Composite Composite
11/26/2020 0:01 11/30/2020 0:01 12/3/2020 0:01 12/7/2020 0:01 12/10/2020 0:01
11/26/2020 23:01 11/30/2020 23:01 12/3/2020 23:01 12/7/2020 23:01 12/10/2020 23:01
24 24 24 24 24
320-67335-2 320-67618-1 320-67618-1 320-67847-1 320-67870-1
320-67335-2 320-67618-1 320-67618-2 320-67847-1 320-67870-1
7.8 J 18 4.4 5.5 5.7
21 J 32 9.5 13 18
7.4 J 14 4.4 6 5.7
<2 UJ 3.2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<20 UJ 27 28 <20 <20
<10 UJ <10 <10 <10 <10
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
4.1 J 8.4 3.9 6.3 <2
4.3 J 9.6 3.1 5.9 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<2 UJ 3.2 <2 2.9 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
<2 UJ <2 <2 <2 <2
5.7 J 4.8 4 4.3 3.7
36 94 46 25 29
36 94 46 25 29
45 120 53 40 29
TR0795 Page 23 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-24-121320 CFR-TARHEEL-12-121420 CAP1220-CFR-TARHEEL-121520 CAP1220-TARHEEL-121620
12/13/2020 12/14/2020 12/15/2020 12/16/2020
Composite Composite Grab Grab
12/13/20 0:01 12/14/2020 0:59 ----
12/13/20 23:01 12/14/2020 11:59 ----
24 12 ----
320-68141-1 320-68141-1 320-68082-1 320-68080-1
320-68141-1 320-68141-2 320-68082-4 320-68080-1
9 9.4 7.6 11
25 27 14 20
9.2 9.9 8.6 9.7
<2 2.1 <2 2.6
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 25 27
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
7.4 J 7.4 J 13 <2
6.9 7.4 8.6 J 9.2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 4.1
<2 <2 <2 <2
2.3 2.4 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
5.3 4.1 3.9 4.3
43 48 55 70
43 48 55 74
60 66 77 84
TR0795 Page 24 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q4 2020 Q4 2020
CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL CFR-TARHEEL
CFR-TARHEEL-121720 CFR-TARHEEL-122120 CFR-TARHEEL-122320 CFR-TARHEEL-122420
12/17/2020 12/21/2020 12/23/2020 12/24/2020
Grab Grab Grab Grab
--------
--------
--------
320-68141-1 320-68261-1 320-68338-1 320-68338-1
320-68141-3 320-68261-1 320-68338-1 320-68338-2
3.2 3.9 3.5 12
6.9 9.9 <2 17
3.1 3.7 3.6 9
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
4.3 J 3.3 J <2 13 J
2.2 3.1 3.2 J 11 J
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.5 3.9 3.4 3.8
13 18 7.1 38
13 18 7.1 38
20 24 10 62
TR0795 Page 25 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q4 2020 Q4 2020 Q1 2020 Q2 2020
CFR-TARHEEL CFR-TARHEEL EQBLK EB
CFR-TARHEEL-122820 CFR-TARHEEL-123020 CFR-EQBLK-1-040820 CFR-TARHEEL-EB-052520
12/28/2020 12/30/2020 4/8/2020 5/25/2020
Grab Grab Grab Grab
------
------
------
Equipment Blank Equipment Blank
320-68338-1 320-68393-1 320-60098-1 320-61296-1
320-68338-3 320-68393-1 320-60098-5 320-61296-4
3 4.4 <4 <2
<2 12 <5 <5
2.5 4.8 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 <10 <10
<10 <10 <20 <20
<2 <2 <2 <2
<2 <2 <2 <2
<2 5.6 <2 <2
2 J 4.3 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 2.8 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
3.4 3.5 <2 --
5.5 21 ND ND
5.5 21 ND ND
7.5 34 ND ND
TR0795 Page 26 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 7
CAPE FEAR RIVER MASS LOAD ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Sampling Event
Location ID
Field Sample ID
Sample Date
Sample Type
Sample Start Date and Time
Sample Stop Date and Time
Composite Duration (hours)
QA/QC
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
Q2 2020 Q2 2020 Q2 2020 Q3 2020
EB FBLK FBLK EB
CFR-TARHEEL-EB-060120 CFR-TARHEEL-FB-052520 CFR-TARHEEL-FB-060120 CAP3Q20-EQBLK-ISCO-072920
6/1/2020 5/25/2020 6/1/2020 7/29/2020
Grab Grab Grab Grab
----
----
----
Equipment Blank Field Blank Field Blank Equipment Blank
320-61452-1 320-61296-1 320-61452-1 320-63228-1
320-61452-4 320-61296-3 320-61452-3 320-63228-4
<2 <2 <2 <2
<2 <5 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
4.1 <2 <2 <2
<2 <2 <2 <2
<13 <10 <13 <20
<2 <20 <2 <10
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2 UJ
<2 <2 <2 <2 UJ
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2 UJ
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
----<2 UJ <2
4.1 ND ND ND
4 ND ND ND
4.1 ND ND ND
Notes:
Bold - Analyte detected above associated reporting limit.
B - analyte detected in an associated blank.
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.
-- not applicable
1 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA), see Appendix J for more details.
2 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
3 - Samples collected on November 24 and 26, 2020 were reanalyzed via method Table 3+ SOP. These reanalysis results are used in mass loading calculations.
TR0795 Page 27 of 27 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID CFR-BLADEN CFR-KINGS CFR-MILE-76 CFR-MILE-763
Field Sample ID CAP1220-CFR-BLADEN-121520 CAP1220-CFR-KINGS-121620 CAP1220-CFR-RM-76-121520 CAP1220-CFR-RM-76-121520
Sample Date 12/15/2020 12/16/2020 12/15/2020 12/15/2020
QA/QC
Sample Matrix LIQUID LIQUID LIQUID LIQUID
Sample Delivery Group (SDG)320-68082-1 320-68082-1 320-68082-1 320-68082-3
Lab Sample ID 320-68082-2 320-68082-3 320-68082-1 320-68082-1
Table 3+ SOP (ng/L)
Hfpo Dimer Acid 7.3 9 <2 <2 UJ
PFMOAA 14 21 <2 <2 UJ
PFO2HxA 7.9 11 <2 <2 UJ
PFO3OA <2 2 <2 <2 UJ
PFO4DA <2 <2 <2 <2 UJ
PFO5DA <2 <2 <2 <2 UJ
PMPA 24 29 23 6.3 J
PEPA <10 <10 <10 <2 UJ
PS Acid <2 <2 <2 <2 UJ
Hydro-PS Acid <2 <2 <2 <2 UJ
R-PSDA <2 21 <2 <2 UJ
Hydrolyzed PSDA 7.3 J 10 J <2 <2 UJ
R-PSDCA <2 <2 <2 <2 UJ
NVHOS 7 6.6 <2 <2 UJ
EVE Acid <2 <2 <2 <2 UJ
Hydro-EVE Acid <2 <2 <2 <2 UJ
R-EVE <2 11 <2 <2 UJ
PES <2 <2 <2 <2 UJ
PFECA B <2 <2 <2 <2 UJ
PFECA-G <2 <2 <2 <2 UJ
Perfluoroheptanoic Acid 4.9 3.9 4.2 4.2
Total Attachment C1 53 72 23 6.3
Total Table 3+ (17 compounds)2 60 79 23 6.3
Total Table 3+ (20 compounds)68 120 23 6.3
TR0795 Page 1 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
CFR-TARHEEL CFR-TARHEEL GBC-1 Lock-Dam Seep
CAP1220-CFR-TARHEEL-121520 CAP1220-TARHEEL-121620 CAP1220-GBC-1-121520 CAP1220-LOCK-DAM-SEEP-121520
12/15/2020 12/16/2020 12/15/2020 12/15/2020
LIQUID LIQUID LIQUID LIQUID
320-68082-1 320-68080-1 320-68084-1 320-68081-1
320-68082-4 320-68080-1 320-68084-4 320-68081-1
7.6 11 380 7,200
14 20 66 75,000
8.6 9.7 250 16,000
<2 2.6 33 6,200
<2 <2 11 1,100
<2 <2 2.1 <78
25 27 610 3,800
<10 <10 170 1,300
<2 <2 <2 <20
<2 <2 24 96
13 <2 120 510
8.6 J 9.2 <2 420
<2 <2 <2 <17
<2 <2 3.6 820
<2 4.1 <2 <17
<2 <2 <2 83
<2 <2 33 170
<2 <2 <2 <6.7
<2 <2 <2 <27
<2 <2 <2 <48
3.9 4.3 3.3 <94
55 70 1,500 110,000
55 74 1,500 110,000
77 84 1,700 110,000
TR0795 Page 2 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
OLDOF-1 OUTFALL 002 River Water Intake 2
CAP1220-OLDOF-1-7-121520 CAP1220-OUTFALL-002-24-121620 RIVER-WATER-INTAKE-24-121620
12/15/2020 12/16/2020 12/16/2020
LIQUID LIQUID LIQUID
320-68080-1 320-68081-1 320-68084-1
320-68080-2 320-68081-2 320-68084-2
230 200 14
1,100 26 J 21
390 28 J 13
120 7.1 J 2.3
45 5.7 <2
15 4.9 J <2
180 61 J 41
62 13 J <10
<2 52 J <2
7.3 6.3 J <2
16 95 18
21 120 J 19 J
<2 <2 <2
16 3.5 J 5.9 J
<2 180 J <2
4.9 7.8 J <2
6.8 29 6.3 J
<2 <2 UJ <2
<2 <2 UJ <2
<2 <2 UJ <2
2.9 4.5 3.6
2,100 400 91
2,200 600 97
2,200 840 140
TR0795 Page 3 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
River Water Intake 2 SEEP-A SEEP-B SEEP-C
RIVER-WATER-INTAKE-24-121620-D CAP1220-SEEP-A-24-121620 CAP1220-SEEP-B-21-121620 CAP1220-SEEP-C-24-121620
12/16/2020 12/16/2020 12/16/2020 12/16/2020
Field Duplicate
LIQUID LIQUID LIQUID LIQUID
320-68084-1 320-68083-1 320-68083-1 320-68083-1
320-68084-3 320-68083-2 320-68083-3 320-68083-4
13 24,000 21,000 34,000
19 96,000 150,000 270,000
12 36,000 36,000 70,000
<2 13,000 7,900 23,000
<2 7,500 1,400 4,000
<2 4,300 380 <78
41 19,000 29,000 13,000
<10 7,000 13,000 3,800
<2 4,800 2,400 <20
<2 1,300 690 710
18 2,500 3,500 2,100
9 J 21,000 J 22,000 J 3,200 J
<2 58 61 48
<2 1,100 2,300 2,100
<2 1,100 3,600 <17
<2 1,400 1,600 2,600
4.2 J 1,300 2,500 2,500
<2 5.9 7.9 27
<2 <13 <27 <27
<2 <24 <48 <48
3.9 <47 <94 220
85 210,000 260,000 420,000
85 220,000 270,000 420,000
120 240,000 300,000 430,000
TR0795 Page 4 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
SEEP-D WC-1 EB
CAP1220-SEEP-D-24-121620 CAP1220-WC-1-22-121620 CAP1220-EQBLK-PP-121520
12/16/2020 12/16/2020 12/15/2020
Equipment Blank
LIQUID LIQUID LIQUID
320-68084-1 320-68083-1 320-68085-1
320-68084-1 320-68083-1 320-68085-1
14,000 240 <2
79,000 330 <2
21,000 230 <2
5,900 34 <2
1,400 8.6 <2
89 <2 <2
6,100 330 <20
2,000 80 <10
<9.8 <2 <2
240 9.5 <2
850 88 <2
1,400 J 130 J <2
14 <2 <2
700 8 <2
<8.7 <2 <2
880 2.8 <2
860 32 <2
5.9 <2 <2
<13 <2 <2
<24 <2 <2
<47 2.9 <2
130,000 1,300 ND
130,000 1,300 ND
130,000 1,500 ND
TR0795 Page 5 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
EB EB EB
CAP1220-EQBLK-BL-121620 CAP1220-EQBLK-ISCO-121620 CAP1220-EQBLK-PP-121620
12/16/2020 12/16/2020 12/16/2020
Equipment Blank Equipment Blank Equipment Blank
LIQUID LIQUID LIQUID
320-68085-1 320-68085-1 320-68085-1
320-68085-4 320-68085-3 320-68085-2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<20 <20 <20
<10 <10 <10
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
<2 <2 <2
ND ND ND
ND ND ND
ND ND ND
TR0795 Page 6 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 8
SEEP AND SURFACE WATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C1
Total Table 3+ (17 compounds)2
Total Table 3+ (20 compounds)
FBLK FBLK
CAP1220-FBLK-121520 CAP1220-FBLK-121620
12/15/2020 12/16/2020
Field Blank Field Blank
LIQUID LIQUID
320-68080-1 320-68080-1
320-68080-3 320-68080-4
<2 <2
<2 <2
<2 <2
<2 <2 Notes:
<2 <2 Bold - Analyte detected above associated reporting limit
<2 <2 B - analyte detected in an associated blank
<20 <20 EPA - Environmental Protection Agency
<10 <10 J - Analyte detected. Reported value may not be accurate or precise
<2 <2 ND - no Table 3+ analytes were detected above the associated reporting limits
<2 <2 ng/L - nanograms per liter
<2 <2 QA/QC - Quality assurance/ quality control
<2 <2 SDG - Sample Delivery Group
<2 <2 SOP - standard operating procedure
<2 <2 UJ - Analyte not detected. Reporting limit may not be accurate or precise.
<2 <2 < - Analyte not detected above associated reporting limit.
<2 <2
<2 <2
<2 <2
<2 <2
<2 <2
<2 <2
ND ND
ND ND
ND ND
1 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
2 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA,
and R-EVE.
3 - CFR-MILE-76 was reanalyzed using Methods Table 3+ SOP and Table 6. These
reanalysis results are used in mass loading calculations.
TR0795 Page 7 of 7 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 9
FLOW SUMMARY FOR SEEPS, SURFACE AND RIVER WATER LOCATIONS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway/ Location Sample Type Flow Measurement Date
Instantaneous
Flow Rate
(ft3/s)1,3
24-Hour Flow
Volume (MG)1,2
Flow Rate
(gpm)
Upstream River Water and Groundwater4 Grab 12/15/2020 5,910 --2,900,000
Willis Creek 24-hour composite 12/16/2020 24 15.3 10,600
Intake River Water at Facility 24-hour composite 12/16/2020 --17 11,500
Outfall 002 24-hour composite 12/16/2020 --17 11,800
Seep A 24-hour composite 12/16/2020 0.21 0.13 93
Seep B 24-hour composite 12/16/2020 0.30 0.19 134
Seep C 24-hour composite 12/16/2020 0.06 0.04 27
Seep D 24-hour composite 12/16/2020 --0.18 124
Lock and Dam Seep Grab 12/15/2020 0.04 --16
Old Outfall 002 Grab 12/15/2020 0.96 --431
Georgia Branch Creek Grab 12/15/2020 14 --6,180
W.O'Huske5 Grab 12/16/2020 --5,710 4,000,000
W.O'Huske6 Grab 12/15/2020 6,130 --2,750,000
W.O'Huske7 Grab 12/15/2020 6,420 --2,880,000
Cape Fear River Lock and Dam #18 Grab 12/16/2020 7,650 --3,430,000
Notes
MG - milllions of gallons
gpm - gallons per minute
ft3/s - cubic feet per second
USGS - United States Geological Survey
8 - Flow rate measured at USGS gauging station #02105769 located at Lock #1 near Kelly used to estimate flow rate at Kings Bluff during sample collection.
5 - Flow rate measured at USGS gauging station #02105500 located at William O Huske Lock & Dam used to estimate flow rate at Tar Heel Ferry Road Bridge during the 24 hr
period between the collection of grab samples on December 15 and 16, 2020.
4 - The volumetric flow rate for upstream river water and groundwater was estimated by subtracting inflows from Willis Creek, upwelling groundwater, seeps to the river, and
Outfall 002 and by adding the river water intake from Chemours to the flow rate measurement from the W.O. Huske Dam.
1 - Flow measurement methods are described in Table 2. Detailed flow data and calculations are provided in Appendix D.
2 - Total flow volume for composite samples is based on flow measurements taken over 24-hour sample collection period for all locations except Upstream River Water, Seep A,
B and C, Lock and Dam Seep and Willis Creek. At these locations, the total flow volume over 24-hour sample collection was estimated based on the instantaneous flow
measurement.
3 - Instantaneous flow rate for grab samples is the recorded flow rate at the time of grab sample collection.
6 - Flow rate measured at USGS gauging station #02105500 located at William O Huske Lock & Dam used to estimate flow rate at Tar Heel Ferry Road Bridge during grab
sample collection.
7 - Flow rate measured at USGS gauging station #02105500 located at William O Huske Lock & Dam used to estimate flow rate at Bladen Bluff during sample collection.
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1 Floodplain Deposits Black Creek Aquifer Floodplain Deposits Floodplain Deposits
Location ID LTW-01 LTW-02 LTW-03 LTW-04
Field Sample ID CAP1220-LTW-01-121020 CAP1220-LTW-02-121020 CAP1220-LTW-03-122220 CAP1220-LTW-04-120820
Sample Date 12/10/2020 12/10/2020 12/22/2020 12/8/2020
QA/QC
Sample Matrix LIQUID LIQUID LIQUID LIQUID
Sample Delivery Group (SDG)320-67869-1 320-67869-1 320-68259-1 320-67766-1
Lab Sample ID 320-67869-3 320-67869-4 320-68259-1 320-67766-1
Table 3+ SOP (ng/L)
Hfpo Dimer Acid 20,000 8,200 10,000 200
PFMOAA 29,000 27,000 180,000 820
PFO2HxA 26,000 12,000 36,000 270
PFO3OA 5,600 2,400 6,000 52
PFO4DA 1,700 160 160 6.1
PFO5DA 380 <39 <78 <2
PMPA 23,000 4,900 11,000 200
PEPA 8,700 1,600 2,600 74
PS Acid <20 <9.8 <20 <2
Hydro-PS Acid 410 <3.1 <6.1 <2
R-PSDA 1,100 360 690 J 24
Hydrolyzed PSDA 430 720 3,100 45
R-PSDCA <17 <8.7 <17 <2
NVHOS 340 280 1,100 15
EVE Acid <17 <8.7 <17 <2
Hydro-EVE Acid 140 35 46 4.8
R-EVE 730 310 520 26
PES <6.7 <3.4 <6.7 <2
PFECA B <27 <13 <27 <2
PFECA-G <48 <24 <48 <2
Perfluoroheptanoic Acid <94 <47 <94 <2
Total Attachment C2 110,000 56,000 250,000 1,600
Total Table 3+ (17 compounds)3 120,000 57,000 250,000 1,600
Total Table 3+ (20 compounds)120,000 58,000 250,000 1,700
TR0795 Page 1 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
Black Creek Aquifer Black Creek Aquifer Floodplain Deposits Black Creek Aquifer
LTW-05 PIW-1D PIW-1S PIW-3D
CAP1220-LTW-05-120920 CAP1220-PIW-1D-121020 CAP1220-PIW-1S-121020 CAP1220-PIW-3D-121120
12/9/2020 12/10/2020 12/10/2020 12/11/2020
LIQUID LIQUID LIQUID LIQUID
320-67844-1 320-67869-1 320-67869-1 320-67866-1
320-67844-8 320-67869-2 320-67869-1 320-67866-3
14,000 10,000 7,600 12,000
160,000 17,000 2,300 5,700
36,000 9,300 5,900 8,800
12,000 1,700 840 1,600
2,000 340 180 820
<78 <39 37 160
4,000 9,000 7,400 9,800
490 2,900 3,000 3,600
<20 <9.8 <3.9 <9.8
240 48 120 140
530 320 390 430
870 23 <7.6 <19
30 <8.7 <3.5 <8.7
1,000 160 38 82
<17 <8.7 <3.5 <8.7
1,000 29 23 45
700 240 250 290
11 <3.4 <2 <3.4
<27 <13 <5.3 <13
<48 <24 <9.6 <24
170 <47 <19 <47
230,000 50,000 27,000 43,000
230,000 50,000 27,000 43,000
230,000 51,000 28,000 43,000
TR0795 Page 2 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
Black Creek Aquifer Floodplain Deposits Floodplain Deposits Surficial Aquifer
PIW-7D PIW-7S PIW-7S PW-04
CAP1220-PIW-7D-120820 CAP1220-PIW-7S-120820 CAP1220-PIW-7S-120820-D CAP1220-PW-04-120820
12/8/2020 12/8/2020 12/8/2020 12/8/2020
Field Duplicate
LIQUID LIQUID LIQUID LIQUID
320-67773-1 320-67775-1 320-67775-1 320-67766-1
320-67773-2 320-67775-1 320-67775-2 320-67766-4
92 150 140 8.8
1,400 180 180 7.4
270 110 110 7.6
35 38 36 2.3
7.4 4.2 3.8 <2
<2 <2 <2 <2
34 110 110 <20
<10 40 44 <10
<2 <2 <2 <2
<2 2.8 2.8 <2
3.6 12 13 <2
6.5 <2 <2 <2
<2 <2 <2 <2
8.4 7.2 7.2 <2
<2 <2 <2 <2
2.5 4.3 4.4 <2
5.1 16 16 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
1,800 640 630 26
1,800 650 640 26
1,900 670 670 26
TR0795 Page 3 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
Surficial Aquifer Surficial Aquifer Black Creek Aquifer Black Creek Aquifer
PW-06 PW-07 PW-09 PZ-22
CAP1220-PW-06-120820 CAP1220-PW-07-120920 CAP1220-PW-09-120820 CAP1220-PZ-22-120920
12/8/2020 12/9/2020 12/8/2020 12/9/2020
LIQUID LIQUID LIQUID LIQUID
320-67773-1 320-67844-1 320-67766-1 320-67844-1
320-67773-1 320-67844-6 320-67766-2 320-67844-7
13 590 <2 9,800
2.2 240 <2 160,000
6.9 580 <2 35,000
<2 73 <2 3,500
<2 36 <2 <59
<2 <2 <2 84
<20 620 <20 4,600
<10 160 <10 1,100
<2 <2 <2 50
<2 12 <2 180
<2 97 <2 670
<2 <2 <2 1,100
<2 <2 <2 130
<2 5.2 <2 1,000
<2 <2 <2 59
<2 5 <2 200
<2 36 <2 760
<2 <2 <2 63
<2 <2 <2 81
<2 <2 <2 92
<2 6.4 <2 <94
22 2,300 0.0 210,000
22 2,300 0.0 220,000
22 2,500 0.0 220,000
TR0795 Page 4 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
Black Creek Aquifer Surficial Aquifer Black Creek Aquifer --
SMW-10 SMW-11 SMW-12 EB
CAP1220-SMW-10-120920 CAP1220-SMW-11-120820 CAP1220-SMW-12-120920 CAP1220-EQBLK-PP-120820
12/9/2020 12/8/2020 12/9/2020 12/8/2020
Equipment Blank
LIQUID LIQUID LIQUID LIQUID
320-67844-1 320-67766-1 320-67844-1 320-67773-1
320-67844-1 320-67766-3 320-67844-2 320-67773-3
<2 29 1,700 <2
53 25 4,800 <2
2.4 24 1,400 <2
<2 4 85 <2
<2 2.4 <12 <2
<2 <2 <16 <2
<20 <20 1,600 <20
<10 <10 320 <10
<2 <2 <3.9 <2
<2 <2 <2 <2
<2 <2 110 <2
<2 <2 <7.6 <2
<2 <2 <3.5 <2
<2 <2 45 <2
<2 <2 <3.5 <2
<2 <2 <2.9 <2
<2 <2 100 <2
<2 <2 <2 <2
<2 <2 <5.3 <2
<2 <2 <9.6 <2
<2 <2 <19 <2
55 84 9,900 ND
55 84 10,000 ND
55 84 10,000 ND
TR0795 Page 5 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
--------
EB EB EB EB
CAP1220-EQBLK-DV-120920 CAP1220-EQBLK-PP-120920 CAP1220-EQBLK-PP-121020 CAP1220-EQBLK-PP-121120
12/9/2020 12/9/2020 12/10/2020 12/11/2020
Equipment Blank Equipment Blank Equipment Blank Equipment Blank
LIQUID LIQUID LIQUID LIQUID
320-67844-1 320-67844-1 320-67866-1 320-67866-1
320-67844-4 320-67844-3 320-67866-2 320-67866-5
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
ND ND ND ND
ND ND ND ND
ND ND ND ND
TR0795 Page 6 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
--------
EB FBLK FBLK FBLK
CAP1220-EQBLK-PP-122220 CAP1220-FBLK-120820 CAP1220-FBLK-120920 CAP1220-FBLK-121020
12/22/2020 12/8/2020 12/9/2020 12/10/2020
Equipment Blank Field Blank Field Blank Field Blank
LIQUID LIQUID LIQUID LIQUID
320-68259-1 320-67773-1 320-67844-1 320-67866-1
320-68259-3 320-67773-4 320-67844-5 320-67866-1
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<20 <20 <20 <20
<10 <10 <10 <10
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
<2 <2 <2 <2
ND ND ND ND
ND ND ND ND
ND ND ND ND
TR0795 Page 7 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 10
GROUNDWATER ANALYTICAL RESULTS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Water Bearing Unit1
Location ID
Field Sample ID
Sample Date
QA/QC
Sample Matrix
Sample Delivery Group (SDG)
Lab Sample ID
Table 3+ SOP (ng/L)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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
Perfluoroheptanoic Acid
Total Attachment C2
Total Table 3+ (17 compounds)3
Total Table 3+ (20 compounds)
----
FBLK FBLK
CAP1220-FBLK-121120 CAP1220-FBLK-122220
12/11/2020 12/22/2020
Field Blank Field Blank
LIQUID LIQUID
320-67866-1 320-68259-1
320-67866-4 320-68259-2
<2 <2
<2 <2
<2 <2 Notes:
<2 <2 Bold - Analyte detected above associated reporting limit
<2 <2 B - analyte detected in an associated blank
<2 <2 EPA - Environmental Protection Agency
<20 <20 J - Analyte detected. Reported value may not be accurate or precise
<10 <10 ND - no Table 3+ analytes were detected above the associated reporting limits
<2 <2 ng/L - nanograms per liter
<2 <2 QA/QC - Quality assurance/ quality control
<2 <2 SDG - Sample Delivery Group
<2 <2 SOP - standard operating procedure
<2 <2 UJ – Analyte not detected. Reporting limit may not be accurate or precise.
<2 <2 < - Analyte not detected above associated reporting limit.
<2 <2
<2 <2
<2 <2
<2 <2
<2 <2
<2 <2
<2 <2
ND ND
ND ND
ND ND
1 - Refers to the primary aquifer unit that the well screen is estimated to be
2 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
3 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed,
PSDA, and R-EVE.
TR0795 Page 8 of 8 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 11
SUMMARY OF CALCULATED TOTAL MASS LOAD IN THE CAPE FEAR RIVER
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Start Date End Date Days
River volume
(m3)
Load in Cape
Fear River
(kg)3,6
Remedy
Reduction
Loads (kg)4,6
Total Load to
Cape Fear
River (kg)5,6
2020-Q1 Report 03/28/2020 1:00 05/09/2020 23:49 43 514,570,000 45.1 0 45.1
2020-Q2 Report 05/09/2020 23:49 06/29/2020 16:06 51 1,308,600,000 79.1 0 79.1
2020-Q3 Report 06/29/2020 16:06 10/01/2020 0:01 93 1,036,200,000 77.3 0 77.3
2020-Q4 Report 10/01/2020 0:01 12/30/2020 10:56 90 2,118,700,000 75.8 25.5 101.3
Total4 03/28/2020 1:00 12/30/2020 10:56 277 4,978,070,000 277.3 25.5 302.8
Reporting Peroid
Reporting Period Details Total Attachment C1
Notes:
1 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
2 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed,
PSDA, and R-EVE.
3 - Calculated Cape Fear River loads represents loads measured in the Cape Fear
River at the CFR-TARHEEL sampling location downstream of the Site.
4 - Calculated remedy reduction loads represents loads from Old Outfall 002 and
Seep C that were prevented from reaching the Cape Fear River.
5 - Total load to Cape Fear River represents the sum of the measured in-river load
and the remedy reduction load. This value represents the baseline load that would
reach the Cape Fear River in the absence of any remedies.
6 - Total values are rounded to two significant digits. Values in calculations
supporting totals are not rounded.
kg - kilograms
m3 - cubic meters
Page 1 of 3 March 2021TR0795
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 11
SUMMARY OF CALCULATED TOTAL MASS LOAD IN THE CAPE FEAR RIVER
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Start Date End Date Days
River volume
(m3)
2020-Q1 Report 03/28/2020 1:00 05/09/2020 23:49 43 514,570,000
2020-Q2 Report 05/09/2020 23:49 06/29/2020 16:06 51 1,308,600,000
2020-Q3 Report 06/29/2020 16:06 10/01/2020 0:01 93 1,036,200,000
2020-Q4 Report 10/01/2020 0:01 12/30/2020 10:56 90 2,118,700,000
Total4 03/28/2020 1:00 12/30/2020 10:56 277 4,978,070,000
Reporting Peroid
Reporting Period Details
Notes:
1 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
2 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed,
PSDA, and R-EVE.
3 - Calculated Cape Fear River loads represents loads measured in the Cape Fear
River at the CFR-TARHEEL sampling location downstream of the Site.
4 - Calculated remedy reduction loads represents loads from Old Outfall 002 and
Seep C that were prevented from reaching the Cape Fear River.
5 - Total load to Cape Fear River represents the sum of the measured in-river load
and the remedy reduction load. This value represents the baseline load that would
reach the Cape Fear River in the absence of any remedies.
6 - Total values are rounded to two significant digits. Values in calculations
supporting totals are not rounded.
kg - kilograms
m3 - cubic meters
Load in Cape
Fear River
(kg)3,6
Remedy
Reduction
Loads (kg)4,6
Total Load to
Cape Fear
River (kg)5,6
45.8 0 45.8
79.7 0 79.7
78.5 0 78.5
76.7 25.8 102.5
280.7 25.8 306.5
Total Table 3+ (17 Compounds)2
Page 2 of 3 March 2021TR0795
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 11
SUMMARY OF CALCULATED TOTAL MASS LOAD IN THE CAPE FEAR RIVER
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Start Date End Date Days
River volume
(m3)
2020-Q1 Report 03/28/2020 1:00 05/09/2020 23:49 43 514,570,000
2020-Q2 Report 05/09/2020 23:49 06/29/2020 16:06 51 1,308,600,000
2020-Q3 Report 06/29/2020 16:06 10/01/2020 0:01 93 1,036,200,000
2020-Q4 Report 10/01/2020 0:01 12/30/2020 10:56 90 2,118,700,000
Total4 03/28/2020 1:00 12/30/2020 10:56 277 4,978,070,000
Reporting Peroid
Reporting Period Details
Notes:
1 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
2 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed,
PSDA, and R-EVE.
3 - Calculated Cape Fear River loads represents loads measured in the Cape Fear
River at the CFR-TARHEEL sampling location downstream of the Site.
4 - Calculated remedy reduction loads represents loads from Old Outfall 002 and
Seep C that were prevented from reaching the Cape Fear River.
5 - Total load to Cape Fear River represents the sum of the measured in-river load
and the remedy reduction load. This value represents the baseline load that would
reach the Cape Fear River in the absence of any remedies.
6 - Total values are rounded to two significant digits. Values in calculations
supporting totals are not rounded.
kg - kilograms
m3 - cubic meters
Load in Cape
Fear River
(kg)3,6
Remedy
Reduction
Loads (kg)4,6
Total Load to
Cape Fear
River (kg)5,6
58.7 0 58.7
101.6 0 101.6
99.5 0 99.5
98.5 26.5 125.0
358.4 26.5 384.9
Total Table 3+ (20 Compounds)
Page 3 of 3 March 2021TR0795
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 12A
CAPE FEAR RIVER PFAS MASS LOAD BY COMPOUND AND TIME INTERVAL
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Interval ID Start Time1 End Time1 Total River
Flow (m3)HFPO-DAPFMOAAPFO2HxAPFO3OAPFO4DAPFO5DAPMPAPEPAPS Acid (Formerly PFESA-BP1)Hydro-PS Acid (Formerly PFESA-BP2)R-PSDA (FormerlyByproduct 4)Hydrolyzed PSDA (Foremerly Byproduct 5)R-PSDCA (FormerlyByproduct 6)NVHOSEVE AcidHydro-EVE AcidR-EVEPESPFECA BPFECA-GPFHpATotal
Attachment C3
Total Table 3+
(17 Compounds)4
Total Table 3+
(20 Compounds)
2020_1_Q1 3/28/20 1:00 3/31/20 12:30 90,900,221 0.29 2.50 0.83 0.10 0 0.00 1.23 0 0 0 0 0.75 0 0 0 0 0.10 0 0 0 1.32 4.9 4.9 5.8
2020_2_Q1 3/31/20 12:30 4/2/20 13:30 27,756,145 0.28 1.17 0.39 0.09 0 0.00 0.47 0 0 0 0.22 0.39 0 0 0 0 0 0 0 0 0.33 2.4 2.4 3.0
2020_3_Q1 4/2/20 13:30 4/3/20 15:00 9,680,794 0.17 0.48 0.21 0.05 0 0.00 0.28 0 0 0 0.13 0.17 0 0 0 0 0.02 0 0 0 0.10 1.2 1.2 1.5
2020_4_Q1 4/3/20 15:00 4/6/20 0:00 15,145,577 0.28 1.14 0.42 0.10 0.02 0.04 0.42 0 0 0 0.18 0.39 0 0.05 0 0 0.03 0 0 0 0.06 2.4 2.5 3.1
2020_5_Q1 4/6/20 0:00 4/9/20 6:30 16,574,785 0.33 1.56 0.55 0.13 0.05 0.08 0.51 0 0 0 0.22 0.51 0 0.08 0 0 0.06 0 0 0 NA 3.2 3.3 4.1
2020_6_Q1 4/9/20 6:30 4/15/20 14:30 38,570,773 0.49 2.35 0.85 0.21 0.05 0.23 0.93 0 0 0 0.25 0.78 0 0.10 0 0 0.07 0 0 0 NA 5.1 5.2 6.3
2020_7_Q1 4/15/20 14:30 4/19/20 2:00 55,746,498 0.31 1.56 0.61 0.14 0 0.38 0.95 0 0 0 0.00 0.54 0 0 0 0 0.00 0 0 0 NA 4.0 4.0 4.5
2020_8_Q1 4/19/20 2:00 4/22/20 13:30 27,903,959 0.33 1.42 0.53 0.14 0 0.15 0.70 0 0 0 0.00 0.47 0 0 0 0 0.00 0 0 0 NA 3.3 3.3 3.8
2020_9_Q1 4/22/20 13:30 4/26/20 0:49 28,652,713 0.32 1.52 0.54 0.14 0 0.00 0.60 0 0 0 0.21 0.66 0 0.08 0 0 0.00 0 0 0 NA 3.1 3.2 4.1
2020_10_Q1 4/26/20 0:49 4/29/20 11:49 22,888,734 0.30 1.35 0.55 0.13 0 0.00 0.53 0 0 0 0.30 0.62 0 0.09 0 0 0.05 0 0 0 NA 2.9 2.9 3.9
2020_11_Q1 4/29/20 11:49 4/30/20 9:49 7,256,900 0.09 0.30 0.14 0.03 0 0.00 0.17 0 0 0 0.12 0.16 0 0.03 0 0 0.03 0 0 0 NA 0.7 0.8 1.1
2020_12_Q1 4/30/20 9:49 5/3/20 1:00 55,522,229 0.67 1.50 0.89 0.19 0 0.00 1.33 0 0 0 1.11 1.00 0 0.18 0 0 0.33 0 0 0 NA 4.6 4.8 7.2
2020_13_Q1 5/3/20 1:00 5/6/20 12:00 72,975,232 0.45 1.31 0.72 0.15 0 0.00 1.09 0 0 0 0.80 0.88 0 0 0 0 0.00 0 0 0 NA 3.7 3.7 5.4
2020_14_Q1 5/6/20 12:00 5/9/20 23:49 44,993,799 0.42 1.53 0.63 0.17 0 0.00 0.81 0 0 0 0.58 0.67 0 0.10 0 0 0.12 0 0 0 NA 3.6 3.7 5.0
2020_1_Q2 5/9/20 23:49 5/13/20 9:49 15,999,330 0.21 1.10 0.43 0.11 0 0.00 0.35 0 0 0 0.19 0.54 0 0.05 0 0 0.08 0 0 0 NA 2.2 2.3 3.1
2020_2_Q2 5/13/20 9:49 5/13/20 20:50 1,909,858 0.04 0.18 0.07 0.02 0 0.00 0.05 0 0 0 0.03 0.09 0 0.01 0 0 0.01 0 0 0 NA 0.4 0.4 0.5
2020_3_Q2 5/13/20 20:50 5/14/20 20:50 3,563,845 0.02 0.08 0.03 0.01 0 0.00 0.02 0 0 0 0.01 0.04 0 0.00 0 0 0.01 0 0 0 NA 0.2 0.2 0.2
2020_4_Q2 5/14/20 20:50 5/16/20 20:50 6,321,849 0.12 0.59 0.23 0.05 0 0.00 0.17 0 0 0 0.09 0.30 0 0.03 0 0 0.04 0 0 0 NA 1.2 1.2 1.6
2020_5_Q2 5/16/20 20:50 5/20/20 8:49 11,021,058 0.28 1.32 0.50 0.11 0 0.00 0.35 0 0 0 0.17 0.60 0 0.04 0 0 0.09 0 0 0 NA 2.8 2.9 3.7
2020_6_Q2 5/20/20 8:49 5/25/20 10:15 216,311,428 2.92 12.98 5.10 1.08 0 0.00 3.46 2 0 0 1.62 6.21 0 0.41 0 0 1.09 0 0 0 NA 28.3 29 38
2020_7_Q2 5/25/20 10:15 5/29/20 9:10 171,453,975 0.56 0.00 0.75 0.00 0 0.00 0.00 0 0 0 0.00 0.29 0 0.00 0 0 0.17 0 0 0 NA 1.3 1.3 1.8
2020_8_Q2 5/29/20 9:10 6/1/20 14:25 171,922,902 0.56 0.49 0.83 0.00 0 0.00 0.00 0 0 0 0.20 0.24 0 0.00 0 0 0.00 0 0 0 NA 1.9 1.9 2.3
2020_9_Q2 6/1/20 14:25 6/5/20 11:06 172,656,875 0.57 1.27 0.83 0.00 0 0.00 2.33 0 0 0 0.20 0.71 0 0.00 0 0 0.00 0 0 0 NA 5.0 5.0 5.9
2020_10_Q2 6/5/20 11:06 6/8/20 22:06 104,412,708 0.68 1.02 0.87 0.00 0 0.00 1.78 0 0 0 0.62 0.75 0 0.00 0 0 0.00 0 0 0 NA 4.7 4.7 6.1
2020_11_Q2 6/8/20 22:06 6/12/20 9:06 58,107,953 0.58 0.99 0.76 0.20 0 0.00 1.45 0 0 0 0.49 0.53 0 0.00 0 0 0.22 0 0 0 NA 4.2 4.2 5.4
2020_12_Q2 6/12/20 9:06 6/15/20 20:06 58,712,971 0.88 0.82 0.76 0.18 0 0.00 1.59 0 0 0 0.28 0.47 0 0.00 0 0 0.00 0 0 0 NA 4.4 4.4 5.2
2020_13_Q2 6/15/20 20:06 6/19/20 7:06 88,876,954 1.42 0.98 1.60 0.34 0 0.00 3.20 0 0 0 0.45 0.64 0 0.00 0 0 0.00 0 0 0 NA 8.0 8.0 9.1
2020_14_Q2 6/19/20 7:06 6/22/20 18:06 120,134,505 0.70 0.59 0.96 0.00 0 0.00 2.52 0 0 0 0.67 0.49 0 0.00 0 0 0.00 0 0 0 NA 4.8 4.8 5.9
2020_15_Q2 6/22/20 18:06 6/26/20 5:06 70,462,140 0.70 2.11 0.92 0.20 0 0.00 1.41 0 0 0 0.78 0.85 0 0.00 0 0 0.25 0 0 0 NA 5.6 5.6 7.4
2020_16_Q2 6/26/20 5:06 6/29/20 16:06 36,712,395 0.55 1.80 0.66 0.15 0 0.00 0.95 0 0 0 0.55 0.62 0 0.09 0 0 0.18 0 0 0 NA 4.3 4.4 5.7
2020_1_Q3 6/29/20 16:06 7/2/20 8:29 16,684,371 0.32 0.00 0.42 0.09 0 0.00 0.45 0 0 0 0.07 0.20 0 0.05 0 0 0.00 0 0 0 NA 1.4 1.5 1.7
2020_2_Q3 7/2/20 8:29 7/3/20 8:29 5,795,071 0.11 0.35 0.15 0.03 0 0.00 0.23 0 0 0 0.13 0.16 0 0.02 0 0 0.04 0 0 0 NA 0.9 0.9 1.2
2020_3_Q3 7/3/20 8:29 7/6/20 8:29 15,030,129 0.29 1.18 0.43 0.09 0 0.00 0.52 0 0 0 0.34 0.47 0 0.06 0 0 0.09 0 0 0 NA 2.5 2.6 3.5
2020_4_Q3 7/6/20 8:29 7/7/20 7:29 4,575,096 0.09 0.44 0.14 0.03 0 0.00 0.14 0 0 0 0.11 0.16 0 0.02 0 0 0.03 0 0 0 NA 0.9 0.9 1.2
2020_5_Q3 7/7/20 7:29 7/9/20 12:01 12,348,326 0.21 1.07 0.35 0.07 0 0.00 0.35 0 0 0 0.22 0.41 0 0.05 0 0 0.06 0 0 0 NA 2.1 2.1 2.8
2020_6_Q3 7/9/20 12:01 7/10/20 11:01 5,842,473 0.09 0.45 0.15 0.03 0 0.00 0.15 0 0 0 0.07 0.19 0 0.02 0 0 0.03 0 0 0 NA 0.9 0.9 1.2
2020_7_Q3 7/10/20 11:01 7/13/20 0:01 14,776,297 0.23 1.01 0.39 0.09 0 0.00 0.39 0 0 0 0.25 0.47 0 0.05 0 0 0.08 0 0 0 NA 2.2 2.2 3.0
2020_8_Q3 7/13/20 0:01 7/13/20 23:01 5,890,640 0.05 0.18 0.08 0.02 0 0.00 0.08 0 0 0 0.06 0.09 0 0.01 0 0 0.02 0 0 0 NA 0.4 0.4 0.6
2020_9_Q3 7/13/20 23:01 7/16/20 0:01 12,180,378 0.22 0.83 0.36 0.08 0 0.00 0.34 0 0 0 0.21 0.34 0 0.04 0 0 0.06 0 0 0 NA 1.9 1.9 2.5
2020_10_Q3 7/16/20 0:01 7/16/20 23:01 4,890,093 0.10 0.37 0.15 0.03 0 0.00 0.14 0 0 0 0.06 0.12 0 0.02 0 0 0.02 0 0 0 NA 0.8 0.8 1.0
2020_11_Q3 7/16/20 23:01 7/20/20 0:01 12,608,784 0.29 1.11 0.38 0.10 0 0.02 0.18 0 0 0 0.08 0.15 0 0.04 0 0 0.02 0 0 0 NA 2.1 2.2 2.4
2020_12_Q3 7/20/20 0:01 7/20/20 23:01 4,441,299 0.12 0.44 0.13 0.04 0 0.01 0.00 0 0 0 0.00 0.00 0 0.02 0 0 0.00 0 0 0 NA 0.8 0.8 0.8
2020_13_Q3 7/20/20 23:01 7/22/20 0:01 5,466,058 0.13 0.27 0.16 0.05 0 0.01 0.08 0 0 0 0.04 0.08 0 0.02 0 0 0.00 0 0 0 NA 0.7 0.8 0.9
2020_14_Q3 7/22/20 0:01 7/22/20 23:01 4,514,442 0.10 0.00 0.14 0.04 0 0.01 0.13 0 0 0 0.06 0.13 0 0.02 0 0 0.00 0 0 0 NA 0.4 0.5 0.7
2020_15_Q3 7/22/20 23:01 7/23/20 23:01 4,066,412 0.08 0.27 0.12 0.03 0 0.01 0.10 0 0 0 0.07 0.12 0 0.02 0 0 0.00 0 0 0 NA 0.6 0.6 0.8
2020_16_Q3 7/23/20 23:01 7/27/20 0:01 20,315,242 0.35 1.10 0.49 0.11 0 0.02 0.24 0 0 0 0.29 0.44 0 0.08 0 0 0.00 0 0 0 NA 2.3 2.4 3.1
2020_17_Q3 7/27/20 0:01 7/27/20 11:01 3,081,921 0.04 0.13 0.06 0.01 0 0.00 0.00 0 0 0 0.04 0.04 0 0.01 0 0 0.00 0 0 0 NA 0.2 0.3 0.3
Calculated Mass Load2 (kg)Interval Details
TR0795 Page 1 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 12A
CAPE FEAR RIVER PFAS MASS LOAD BY COMPOUND AND TIME INTERV LA
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Interval ID Start Time1 End Time1 Total River
Flow (m3)HFPO-DAPFMOAAPFO2HxAPFO3OAPFO4DAPFO5DAPMPAPEPAPS Acid (Formerly PFESA-BP1)Hydro-PS Acid (Formerly PFESA-BP2)R-PSDA (FormerlyByproduct 4)Hydrolyzed PSDA (Foremerly Byproduct 5)R-PSDCA (FormerlyByproduct 6)NVHOSEVE AcidHydro-EVE AcidR-EVEPESPFECA BPFECA-GPFHpATotal
Attachment C3
Total Table 3+
(17 Compounds)4
Total Table 3+
(20 Compounds)
Calculated Mass Load2 (kg)Interval Details
2020_18_Q3 7/27/20 11:01 7/28/20 16:20 8,598,694 0.12 0.34 0.16 0.04 0 0.00 0.00 0 0 0 0.05 0.06 0 0.03 0 0 0.00 0 0 0 NA 0.7 0.7 0.8
2020_19_Q3 7/28/20 16:20 7/29/20 0:01 2,165,219 0.03 0.09 0.04 0.01 0 0.00 0.00 0 0 0 0.00 0.01 0 0.01 0 0 0.00 0 0 0 0.01 0.2 0.2 0.2
2020_20_Q3 7/29/20 0:01 7/29/20 23:01 6,721,966 0.09 0.36 0.14 0.03 0 0.00 0.00 0 0 0 0.00 0.13 0 0.02 0 0 0.00 0 0 0 0.02 0.6 0.7 0.8
2020_21_Q3 7/29/20 23:01 7/30/20 23:01 9,491,439 0.10 0.39 0.17 0.05 0 0.00 0.00 0 0 0 0.00 0.17 0 0.03 0 0 0.00 0 0 0 0.03 0.7 0.8 0.9
2020_22_Q3 7/30/20 23:01 8/3/20 14:50 30,789,134 0.40 1.37 0.63 0.16 0 0.00 0.32 0 0 0 0.00 0.60 0 0.09 0 0 0.00 0 0 0 0.12 3.0 3.1 3.7
2020_23_Q3 8/3/20 14:50 8/4/20 12:30 6,376,388 0.19 0.30 0.19 0.05 0 0.00 0.21 0 0 0 0.00 0.17 0 0.02 0 0 0.00 0 0 0 0.03 1.0 1.0 1.2
2020_24_Q3 8/4/20 12:30 8/5/20 23:55 30,928,538 0.75 0.85 0.70 0.15 0 0.00 0.70 0 0 0 0.00 0.53 0 0.04 0 0 0.00 0 0 0 0.12 3.5 3.6 4.1
2020_25_Q3 8/5/20 23:55 8/6/20 22:55 20,578,759 0.10 0.17 0.17 0.00 0 0.00 0.00 0 0 0 0.00 0.05 0 0.00 0 0 0.00 0 0 0 0.05 0.4 0.4 0.5
2020_26_Q3 8/6/20 22:55 8/9/20 22:38 58,359,492 0.37 0.24 0.82 0.18 0 0.00 0.00 0 0 0 0.00 0.07 0 0.00 0 0 0.00 0 0 0 0.21 1.7 1.7 1.7
2020_27_Q3 8/9/20 22:38 8/10/20 21:56 13,933,248 0.11 0.00 0.28 0.08 0 0.00 0.00 0 0 0 0.00 0.00 0 0.00 0 0 0.00 0 0 0 0.06 0.5 0.5 0.5
2020_28_Q3 8/10/20 21:56 8/12/20 0:01 20,465,095 0.14 0.28 0.32 0.08 0 0.00 0.00 0 0 0 0.08 0.15 0 0.00 0 0 0.04 0 0 0 0.09 0.8 0.8 1.1
2020_29_Q3 8/12/20 0:01 8/12/20 23:01 18,224,184 0.11 0.49 0.20 0.04 0 0.00 0.00 0 0 0 0.13 0.27 0 0.00 0 0 0.07 0 0 0 0.07 0.8 0.8 1.3
2020_30_Q3 8/12/20 23:01 8/17/20 0:01 68,965,142 0.32 1.45 0.59 0.07 0 0.00 0.00 0 0 0 0.39 0.74 0 0.00 0 0 0.13 0 0 0 0.22 2.4 2.4 3.7
2020_31_Q3 8/17/20 0:01 8/17/20 23:01 29,873,707 0.10 0.45 0.19 0.00 0 0.00 0.00 0 0 0 0.11 0.19 0 0.00 0 0 0.00 0 0 0 0.07 0.7 0.7 1.0
2020_32_Q3 8/17/20 23:01 8/20/20 0:01 60,110,322 0.29 1.23 0.55 0.07 0 0.00 0.00 0 0 0 0.30 0.52 0 0.00 0 0 0.00 0 0 0 0.16 2.1 2.1 3.0
2020_33_Q3 8/20/20 0:01 8/20/20 23:01 20,274,466 0.13 0.53 0.24 0.05 0 0.00 0.00 0 0 0 0.12 0.22 0 0.00 0 0 0.00 0 0 0 0.06 0.9 0.9 1.3
2020_34_Q3 8/20/20 23:01 8/25/20 0:01 82,304,076 0.55 2.43 1.11 0.22 0 0.00 0.00 0 0 0 0.25 0.45 0 0.00 0 0 0.00 0 0 0 0.26 4.3 4.3 5.0
2020_35_Q3 8/25/20 0:01 8/25/20 23:01 14,273,984 0.10 0.47 0.21 0.04 0 0.00 0.00 0 0 0 0.00 0.00 0 0.00 0 0 0.00 0 0 0 0.05 0.8 0.8 0.8
2020_36_Q3 8/25/20 23:01 8/27/20 11:18 13,059,107 0.12 0.63 0.25 0.06 0 0.00 0.15 0 0 0 0.03 0.15 0 0.00 0 0 0.02 0 0 0 0.05 1.2 1.2 1.4
2020_37_Q3 8/27/20 11:18 8/31/20 13:30 21,797,969 0.33 1.78 0.64 0.14 0 0.00 0.59 0 0 0 0.17 0.66 0 0.03 0 0 0.08 0 0 0 0.10 3.6 3.6 4.5
2020_38_Q3 8/31/20 13:30 9/3/20 0:01 30,093,899 0.39 1.82 0.71 0.17 0 0.00 0.47 0 0 0 0.22 0.70 0 0.04 0 0 0.07 0 0 0 0.12 3.6 3.7 4.7
2020_39_Q3 9/3/20 0:01 9/3/20 23:01 13,891,707 0.11 0.29 0.17 0.05 0 0.00 0.00 0 0 0 0.05 0.12 0 0.00 0 0 0.00 0 0 0 0.03 0.6 0.6 0.8
2020_40_Q3 9/3/20 23:01 9/7/20 0:01 30,452,220 0.30 0.72 0.44 0.12 0 0.00 0.00 0 0 0 0.05 0.36 0 0.00 0 0 0.00 0 0 0 0.07 1.6 1.6 2.0
2020_41_Q3 9/7/20 0:01 9/7/20 23:01 7,001,539 0.08 0.18 0.12 0.03 0 0.00 0.00 0 0 0 0.00 0.11 0 0.00 0 0 0.00 0 0 0 0.02 0.4 0.4 0.5
2020_42_Q3 9/7/20 23:01 9/10/20 0:01 11,457,874 0.22 0.46 0.27 0.07 0 0.00 0.17 0 0 0 0.08 0.32 0 0.02 0 0 0.04 0 0 0 0.04 1.2 1.2 1.7
2020_43_Q3 9/10/20 0:01 9/10/20 23:01 3,946,632 0.10 0.22 0.12 0.03 0 0.00 0.12 0 0 0 0.06 0.16 0 0.01 0 0 0.02 0 0 0 0.02 0.6 0.6 0.9
2020_44_Q3 9/10/20 23:01 9/14/20 0:01 15,795,194 0.35 0.72 0.44 0.10 0 0.00 0.24 0 0 0 0.14 0.51 0 0.06 0 0 0.05 0 0 0 0.08 1.9 1.9 2.7
2020_45_Q3 9/14/20 0:01 9/14/20 23:01 4,603,385 0.08 0.17 0.12 0.02 0 0.00 0.00 0 0 0 0.02 0.11 0 0.02 0 0 0.00 0 0 0 0.02 0.4 0.4 0.5
2020_46_Q3 9/14/20 23:01 9/17/20 0:01 8,296,694 0.18 0.15 0.24 0.05 0 0.00 0.14 0 0 0 0.06 0.22 0 0.04 0 0 0.01 0 0 0 0.04 0.8 0.8 1.1
2020_47_Q3 9/17/20 0:01 9/17/20 23:01 3,677,254 0.09 0.00 0.12 0.03 0 0.00 0.12 0 0 0 0.04 0.11 0 0.02 0 0 0.01 0 0 0 0.02 0.4 0.4 0.6
2020_48_Q3 9/17/20 23:01 9/18/20 10:01 3,161,179 0.13 0.00 0.12 0.03 0 0.00 0.15 0 0 0 0.16 0.15 0 0.02 0 0 0.02 0 0 0 0.01 0.5 0.5 0.9
2020_49_Q3 9/18/20 10:01 9/21/20 0:01 28,670,297 0.71 0.11 0.68 0.13 0 0.00 1.15 0 0 0 0.75 0.81 0 0.08 0 0 0.11 0 0 0 0.12 3.2 3.3 5.0
2020_50_Q3 9/21/20 0:01 9/21/20 23:01 15,482,746 0.11 0.12 0.13 0.00 0 0.00 0.53 0 0 0 0.00 0.15 0 0.00 0 0 0.00 0 0 0 0.06 0.9 0.9 1.0
2020_51_Q3 9/21/20 23:01 9/24/20 0:01 26,249,972 0.24 0.29 0.24 0.04 0 0.00 0.85 0 0 0 0.00 0.27 0 0.00 0 0 0.00 0 0 0 0.13 1.7 1.7 1.9
2020_52_Q3 9/24/20 0:01 9/24/20 23:01 10,370,932 0.11 0.15 0.10 0.03 0 0.00 0.32 0 0 0 0.00 0.11 0 0.00 0 0 0.00 0 0 0 0.06 0.7 0.7 0.8
2020_53_Q3 9/24/20 23:01 9/25/20 23:01 10,821,255 0.12 0.13 0.13 0.03 0 0.00 0.35 0 0 0 0.00 0.15 0 0.00 0 0 0.00 0 0 0 0.06 0.8 0.8 0.9
2020_54_Q3 9/25/20 23:01 9/26/20 23:01 19,919,967 0.24 0.18 0.26 0.05 0 0.00 0.68 0 0 0 0.00 0.26 0 0.00 0 0 0.00 0 0 0 0.10 1.4 1.4 1.7
2020_55_Q3 9/26/20 23:01 9/28/20 0:01 28,474,571 0.26 0.21 0.27 0.04 0 0.00 0.94 0 0 0 0.00 0.29 0 0.00 0 0 0.00 0 0 0 0.12 1.7 1.7 2.0
2020_56_Q3 9/28/20 0:01 9/28/20 23:01 22,732,255 0.14 0.14 0.14 0.00 0 0.00 0.73 0 0 0 0.00 0.16 0 0.00 0 0 0.00 0 0 0 0.08 1.2 1.2 1.3
2020_57_Q3 9/28/20 23:01 9/29/20 23:01 22,444,018 0.12 0.09 0.15 0.00 0 0.00 0.00 0 0 0 0.00 0.12 0 0.00 0 0 0.00 0 0 0 0.09 0.4 0.4 0.5
2020_58_Q3 9/29/20 23:01 10/1/20 0:01 28,869,846 0.32 0.66 0.35 0.07 0 0.00 0.72 0 0 0 0.21 0.35 0 0.00 0 0 0.08 0 0 0 0.14 2.1 2.1 2.8
2020_1_Q4 10/1/20 0:01 10/1/20 17:01 22,630,824 0.12 0.07 0.15 0.00 0 0.00 0.00 0 0 0 0.00 0.00 0 0.00 0 0 0.00 0 0 0 0.12 0.3 0.3 0.3
2020_2_Q4 10/1/20 17:01 10/6/20 15:30 94,327,975 0.63 0.32 0.78 0.10 0 0.00 0.00 0 0 0 0.00 0.24 0 0.00 0 0 0.00 0 0 0 0.51 1.8 1.8 2.1
2020_3_Q4 10/6/20 15:30 10/6/20 23:30 3,102,054 0.03 0.01 0.03 0.01 0 0.00 0.00 0 0 0 0.00 0.02 0 0.00 0 0 0.00 0 0 0 0.02 0.1 0.1 0.1
2020_4_Q4 10/6/20 23:30 10/7/20 17:30 5,666,371 0.06 0.03 0.07 0.02 0 0.00 0.00 0 0 0 0.00 0.04 0 0.00 0 0 0.00 0 0 0 0.03 0.2 0.2 0.2
2020_5_Q4 10/7/20 17:30 10/8/20 16:30 6,244,374 0.08 0.05 0.09 0.02 0 0.00 0.00 0 0 0 0.00 0.05 0 0.00 0 0 0.00 0 0 0 0.03 0.2 0.2 0.3
2020_6_Q4 10/8/20 16:30 10/12/20 0:01 18,702,796 0.34 0.57 0.42 0.16 0 0.03 0.31 0 0 0 0.19 0.27 0 0.03 0 0 0.04 0 0 0 0.09 1.9 2.0 2.5
2020_7_Q4 10/12/20 0:01 10/12/20 23:01 9,731,254 0.22 0.53 0.29 0.13 0 0.03 0.32 0 0 0 0.19 0.20 0 0.03 0 0 0.05 0 0 0 0.04 1.6 1.7 2.1
2020_8_Q4 10/12/20 23:01 10/15/20 0:01 47,688,854 0.66 1.65 0.88 0.31 0 0.08 0.79 0 0 0 0.56 0.62 0 0.07 0 0 0.11 0 0 0 0.19 4.6 4.7 6.0
2020_9_Q4 10/15/20 0:01 10/15/20 23:01 20,096,070 0.09 0.30 0.14 0.00 0 0.00 0.00 0 0 0 0.07 0.10 0 0.00 0 0 0.00 0 0 0 0.08 0.5 0.5 0.7
2020_10_Q4 10/15/20 23:01 10/19/20 0:01 54,708,233 0.29 0.90 0.40 0.00 0 0.00 0.00 0 0 0 0.21 0.31 0 0.00 0 0 0.00 0 0 0 0.25 1.6 1.6 2.1
2020_11_Q4 10/19/20 0:01 10/19/20 23:01 17,102,073 0.10 0.31 0.13 0.00 0 0.00 0.00 0 0 0 0.07 0.11 0 0.00 0 0 0.00 0 0 0 0.09 0.5 0.5 0.7
TR0795 Page 2 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 12A
CAPE FEAR RIVER PFAS MASS LOAD BY COMPOUND AND TIME INTERV LA
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Interval ID Start Time1 End Time1 Total River
Flow (m3)HFPO-DAPFMOAAPFO2HxAPFO3OAPFO4DAPFO5DAPMPAPEPAPS Acid (Formerly PFESA-BP1)Hydro-PS Acid (Formerly PFESA-BP2)R-PSDA (FormerlyByproduct 4)Hydrolyzed PSDA (Foremerly Byproduct 5)R-PSDCA (FormerlyByproduct 6)NVHOSEVE AcidHydro-EVE AcidR-EVEPESPFECA BPFECA-GPFHpATotal
Attachment C3
Total Table 3+
(17 Compounds)4
Total Table 3+
(20 Compounds)
Calculated Mass Load2 (kg)Interval Details
2020_12_Q4 10/19/20 23:01 10/22/20 0:01 30,272,040 0.20 0.38 0.24 0.00 0 0.00 0.42 0 0 0 0.06 0.09 0 0.00 0 0 0.00 0 0 0 0.16 1.2 1.2 1.4
2020_13_Q4 10/22/20 0:01 10/22/20 23:01 11,426,018 0.08 0.08 0.09 0.00 0 0.00 0.32 0 0 0 0.00 0.00 0 0.00 0 0 0.00 0 0 0 0.06 0.6 0.6 0.6
2020_14_Q4 10/22/20 23:01 10/30/20 0:01 54,393,236 0.49 0.98 0.58 0.08 0 0.00 0.76 0 0 0 0.30 0.23 0 0.10 0 0 0.08 0 0 0 0.26 2.9 3.0 3.6
2020_15_Q4 10/30/20 0:01 10/31/20 0:01 9,159,622 0.10 0.27 0.12 0.03 0 0.00 0.00 0 0 0 0.10 0.08 0 0.03 0 0 0.03 0 0 0 0.04 0.5 0.5 0.8
2020_16_Q4 10/31/20 0:01 10/31/20 23:01 9,568,914 0.08 0.26 0.11 0.02 0 0.00 0.20 0 0 0 0.09 0.06 0 0.04 0 0 0.02 0 0 0 0.05 0.7 0.7 0.9
2020_17_Q4 10/31/20 23:01 11/2/20 0:01 13,443,423 0.11 0.28 0.13 0.02 0 0.00 0.28 0 0 0 0.06 0.07 0 0.05 0 0 0.01 0 0 0 0.07 0.8 0.9 1.0
2020_18_Q4 11/2/20 0:01 11/2/20 23:01 14,928,953 0.10 0.22 0.13 0.00 0 0.00 0.30 0 0 0 0.00 0.06 0 0.05 0 0 0.00 0 0 0 0.09 0.8 0.8 0.9
2020_19_Q4 11/2/20 23:01 11/5/20 0:01 28,761,279 0.19 0.53 0.26 0.03 0 0.00 0.66 0 0 0 0.00 0.13 0 0.05 0 0 0.00 0 0 0 0.16 1.7 1.7 1.8
2020_20_Q4 11/5/20 0:01 11/5/20 23:01 9,736,096 0.06 0.21 0.09 0.02 0 0.00 0.25 0 0 0 0.00 0.05 0 0.00 0 0 0.00 0 0 0 0.05 0.6 0.6 0.7
2020_21_Q4 11/5/20 23:01 11/9/20 0:01 19,869,252 0.18 0.57 0.26 0.06 0 0.00 0.48 0 0 0 0.16 0.19 0 0.03 0 0 0.03 0 0 0 0.09 1.5 1.6 2.0
2020_22_Q4 11/9/20 0:01 11/9/20 23:01 5,385,015 0.06 0.19 0.09 0.02 0 0.00 0.12 0 0 0 0.09 0.08 0 0.02 0 0 0.02 0 0 0 0.02 0.5 0.5 0.7
2020_23_Q4 11/9/20 23:01 11/11/20 0:01 5,694,659 0.07 0.21 0.10 0.02 0 0.00 0.06 0 0 0 0.09 0.08 0 0.02 0 0 0.02 0 0 0 0.02 0.5 0.5 0.7
2020_24_Q4 11/11/20 0:01 11/12/20 0:01 5,548,629 0.08 0.21 0.10 0.02 0 0.00 0.00 0 0 0 0.09 0.08 0 0.02 0 0 0.02 0 0 0 0.02 0.4 0.4 0.6
2020_25_Q4 11/12/20 0:01 11/12/20 19:01 15,004,644 0.69 0.72 0.68 0.17 0 0.08 0.78 0 0 0 0.59 0.32 0 0.05 0 0 0.17 0 0 0 0.05 3.5 3.6 4.7
2020_26_Q4 11/12/20 19:01 11/13/20 14:10 43,872,706 1.07 1.05 1.06 0.24 0 0.12 1.14 0 0 0 0.86 0.46 0 0.07 0 0 0.24 0 0 0 0.15 5.3 5.4 7.0
2020_27_Q4 11/13/20 14:10 11/18/20 12:25 340,079,098 1.50 1.38 1.87 0.00 0 0.00 0.00 0 0 0 1.05 0.43 0 0.00 0 0 0.00 0 0 0 0.97 4.7 4.7 6.2
2020_28_Q4 11/18/20 12:25 11/20/20 11:06 68,070,868 0.41 0.62 0.52 0.00 0 0.00 0.00 0 0 0 0.45 0.25 0 0.00 0 0 0.00 0 0 0 0.20 1.5 1.5 2.2
2020_29_Q4 11/20/20 11:06 11/24/20 0:01 114,667,938 0.76 1.61 0.78 0.00 0 0.00 0.00 0 0 0 0.60 0.48 0 0.00 0 0 0.00 0 0 0 0.45 3.1 3.1 4.2
2020_30_Q4 11/24/20 0:01 11/24/20 23:01 26,346,560 0.19 0.47 0.16 0.00 0 0.00 0.00 0 0 0 0.09 0.09 0 0.00 0 0 0.00 0 0 0 0.12 0.8 0.8 1.0
2020_31_Q4 11/24/20 23:01 11/26/20 0:01 24,616,628 0.18 0.48 0.17 0.00 0 0.00 0.00 0 0 0 0.09 0.10 0 0.00 0 0 0.00 0 0 0 0.13 0.8 0.8 1.0
2020_32_Q4 11/26/20 0:01 11/26/20 23:01 18,652,845 0.15 0.39 0.14 0.00 0 0.00 0.00 0 0 0 0.08 0.08 0 0.00 0 0 0.00 0 0 0 0.11 0.7 0.7 0.8
2020_33_Q4 11/26/20 23:01 11/30/20 0:01 42,065,553 0.54 1.11 0.45 0.07 0 0.00 0.57 0 0 0 0.26 0.29 0 0.00 0 0 0.07 0 0 0 0.22 2.7 2.7 3.4
2020_34_Q4 11/30/20 0:01 11/30/20 23:01 14,786,746 0.27 0.47 0.21 0.05 0 0.00 0.40 0 0 0 0.12 0.14 0 0.00 0 0 0.05 0 0 0 0.07 1.4 1.4 1.7
2020_35_Q4 11/30/20 23:01 12/3/20 0:01 61,797,695 0.69 1.28 0.57 0.10 0 0.00 1.70 0 0 0 0.38 0.39 0 0.00 0 0 0.10 0 0 0 0.27 4.3 4.3 5.2
2020_36_Q4 12/3/20 0:01 12/3/20 23:01 29,417,522 0.13 0.28 0.13 0.00 0 0.00 0.82 0 0 0 0.11 0.09 0 0.00 0 0 0.00 0 0 0 0.12 1.4 1.4 1.6
2020_37_Q4 12/3/20 23:01 12/7/20 0:01 78,024,607 0.39 0.88 0.41 0.00 0 0.00 1.09 0 0 0 0.40 0.35 0 0.00 0 0 0.11 0 0 0 0.32 2.8 2.8 3.6
2020_38_Q4 12/7/20 0:01 12/7/20 23:01 24,457,855 0.13 0.32 0.15 0.00 0 0.00 0.00 0 0 0 0.15 0.14 0 0.00 0 0 0.07 0 0 0 0.11 0.6 0.6 1.0
2020_39_Q4 12/7/20 23:01 12/10/20 0:01 50,972,618 0.29 0.79 0.30 0.00 0 0.00 0.00 0 0 0 0.16 0.15 0 0.00 0 0 0.07 0 0 0 0.20 1.4 1.4 1.8
2020_40_Q4 12/10/20 0:01 12/10/20 23:01 20,430,180 0.12 0.37 0.12 0.00 0 0.00 0.00 0 0 0 0.00 0.00 0 0.00 0 0 0.00 0 0 0 0.08 0.6 0.6 0.6
2020_41_Q4 12/10/20 23:01 12/13/20 0:01 31,261,119 0.23 0.67 0.23 0.00 0 0.00 0.00 0 0 0 0.12 0.11 0 0.00 0 0 0.04 0 0 0 0.14 1.1 1.1 1.4
2020_42_Q4 12/13/20 0:01 12/13/20 23:01 11,706,864 0.11 0.29 0.11 0.00 0 0.00 0.00 0 0 0 0.09 0.08 0 0.00 0 0 0.03 0 0 0 0.06 0.5 0.5 0.7
2020_43_Q4 12/13/20 23:01 12/14/20 0:59 982,198 0.01 0.03 0.01 0.00 0 0.00 0.00 0 0 0 0.01 0.01 0 0.00 0 0 0.00 0 0 0 0.00 0.0 0.0 0.1
2020_44_Q4 12/14/20 0:59 12/14/20 11:59 5,310,853 0.05 0.14 0.05 0.01 0 0.00 0.00 0 0 0 0.04 0.04 0 0.00 0 0 0.01 0 0 0 0.02 0.3 0.3 0.3
2020_45_Q4 12/14/20 11:59 12/15/20 16:11 15,379,021 0.16 0.36 0.15 0.04 0 0.00 0.21 0 0 0 0.06 0.13 0 0.00 0 0 0.02 0 0 0 0.06 0.9 0.9 1.1
2020_46_Q4 12/15/20 16:11 12/17/20 12:29 47,125,887 0.33 0.63 0.30 0.06 0 0.00 0.64 0 0 0 0.10 0.27 0 0.00 0 0 0.00 0 0 0 0.21 2.0 2.1 2.4
2020_47_Q4 12/17/20 12:29 12/21/20 13:52 149,396,568 0.53 1.25 0.51 0.00 0 0.00 0.00 0 0 0 0.57 0.40 0 0.00 0 0 0.00 0 0 0 0.63 2.3 2.3 3.3
2020_48_Q4 12/21/20 13:52 12/23/20 9:30 65,902,080 0.24 0.33 0.24 0.00 0 0.00 0.00 0 0 0 0.11 0.21 0 0.00 0 0 0.00 0 0 0 0.24 0.8 0.8 1.1
2020_49_Q4 12/23/20 9:30 12/24/20 19:20 43,431,813 0.34 0.37 0.27 0.00 0 0.00 0.00 0 0 0 0.28 0.31 0 0.00 0 0 0.00 0 0 0 0.16 1.0 1.0 1.6
2020_50_Q4 12/24/20 19:20 12/28/20 15:00 183,564,524 1.38 1.56 1.06 0.00 0 0.00 0.00 0 0 0 1.19 1.19 0 0.00 0 0 0.00 0 0 0 0.66 4.0 4.0 6.4
2020_51_Q4 12/28/20 15:00 12/30/20 10:56 73,223,967 0.27 0.44 0.27 0.00 0 0.00 0.00 0 0 0 0.21 0.23 0 0.00 0 0 0.10 0 0 0 0.25 1.0 1.0 1.5
Totals 4,978,097,468 43 103 57 10 2 1 55 5 1 0 27 45 0 3 0 0 6 0 0 0 14 277 281 358
Notes:
1 - Start and end times are adjusted based on sampling times ± one hour to account for the total flow of the Cape Fear River.
2 - The calculated mass load is a product of weighted concentration and total river flow, see Appendix B for more details.
3 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
4 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
TR0795 Page 3 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 12B
OLD OUTFALL 002 CAPTURED MASS LOAD BY COMPOUND AND TIME INTERVAL
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Interval ID Start Time End Time
Duration
(hours)
Total
Flow
(m3)HFPO-DAPFMOAAPFO2HxAPFO3OAPFO4DAPFO5DAPMPAPEPAPS AcidHydro-PS AcidR-PSDAHydrolyzed PSDAR-PSDCANVHOSEVE AcidHydro-EVE AcidR-EVEPESPFECA BPFECA-GTotal
Attachment
C2,4
Total Table
3+ (17
compounds)3
Total Table
3+ (20
compounds)
OF003_2020_1_Q4 10/1/20 0:00 10/31/20 0:00 720 90,000 0.41 4.98 1.24 0.34 0.10 0.06 0.47 0.12 0.02 0.02 0.05 0.13 0.00 0.05 0.00 0.02 0.02 0.00 0.00 0.00 7.73 7.82 8.00
OF003_2020_2_Q4 11/1/20 0:00 11/30/20 0:00 696 80,000 0.52 4.86 1.00 0.33 0.12 0.06 0.50 0.16 0.08 0.03 0.03 0.15 0.00 0.05 0.00 0.02 0.02 0.00 0.00 0.00 7.62 7.70 7.87
OF003_2020_3_Q4 12/1/20 0:00 12/31/20 0:00 720 120,000 0.53 5.89 1.42 0.34 0.11 0.07 0.55 0.17 0.10 0.04 0.08 0.24 0.00 0.05 0.01 0.02 0.03 0.00 0.00 0.00 9.20 9.31 9.67
290,000 1.46 15.73 3.66 1.01 0.32 0.19 1.53 0.45 0.20 0.09 0.16 0.52 0.00 0.15 0.01 0.05 0.06 0.00 0.00 0.00 24.5 24.8 25.5
Notes:
1 - The calculated captured mass load is a product of the concentration difference in the influent and the effluent samples and total flow at the influent for the sampling interval, see Appendix B for more details.
2 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
3 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
OF003 - Outfall 003, i.e., Old Outfall 002 treatment system
Interval Details Calculated Captured Mass Load (kg)1
Total
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 12C
SEEP C FLOW THROUGH CELL CAPTURED MASS LOAD BY COMPOUND AND TIME INTERVAL
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Interval ID Start Time End Time
Duration
(hours)
Total
Flow
(m3)Hfpo Dimer AcidPFMOAAPFO2HxAPFO3OAPFO4DAPFO5DAPMPAPEPAPS AcidHydro-PS AcidR-PSDAHydrolyzed PSDAR-PSDCANVHOSEVE AcidHydro-EVE AcidR-EVEPESPFECA BPFECA-GTotal
Attachment
C2
Total Table
3+ (17
compounds)3
Total Table
3+ (20
compounds)
SeepC_2020_1_Q44 12/17/2020 12/30/2020 291 5513 0.105 0.529 0.149 0.042 0.011 0 0.050 0.017 0 0.002 0.006 0.007 0 0.005 0 0.008 0.005 0 0 0 0.88 0.93 0.93
SeepC_2020_2_Q4 12/30/2020 12/31/2020 24 522 0.010 0.039 0.012 0.004 0.001 0 0.005 0.002 0 0.0002 0.0004 0.001 0 0.0004 0 0.001 0.0005 0 0 0 0.07 0.07 0.07
6035 0.115 0.568 0.161 0.046 0.012 0 0.055 0.018 0 0.002 0.006 0.008 0 0.005 0 0.009 0.006 0 0 0 0.95 1.01 1.01
Notes:
1 - The calculated captured mass load is a product of the concentration difference in the influent and the effluent samples and total flow recorded at the influent for the sampling interval, see Appendix B for more details.
2 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
3 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
4 - Seep C was not operation for 47 hours between December 25 and 27, 2020 due to flooding.
Interval Details Calculated Captured Mass Load (kg)1
Total
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 13
SUMMARY OF TOTAL PFAS MASS DISCHARGE AT TARHEEL FERRY ROAD BRIDGE
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC P.C.
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Q1 CFR-TARHEEL-83-033120 3-31-20 12:00 83 52 52 63 3,197,300,000 --16 16 19
Q1 CFR-TARHEEL-83-033120-D 3-31-20 12:00 83 56 56 65 3,197,300,000 --17 17 20
Q1 CFR-TARHEEL-48-040220 4-2-20 13:00 48 86 86 110 958,620,000 --14 14 17
Q1 CAP1Q20-CFR-TARHEEL-040220 4-2-20 15:45 0 89 91 130 --4,770 12 12 18
Q1 CAP1Q20-CFR-TARHEEL-24-040320 4-3-20 15:00 24 120 120 160 319,930,000 --13 13 16
Q1 CFR-TARHEEL-83-040620 4-6-20 0:30 83 120 130 160 880,860,000 --10 11 13
Q1 CFR-TARHEEL-79-040920 4-9-20 6:30 79 190 200 250 589,470,000 --11 12 14
Q1 CFR-TARHEEL-83-041920 4-19-20 1:30 83 71 71 81 1,960,700,000 --13 13 15
Q1 CFR-TARHEEL-83-042220 4-22-20 13:30 83 120 120 130 977,480,000 --11 11 12
Q1 CFR-TARHEEL-83-042620 4-26-20 0:49 83 110 110 140 1,006,200,000 --10 11 14
Q1 CFR-TARHEEL-83-042920 4-29-20 11:49 83 120 130 170 808,310,000 --9.2 9.9 13
Q1 CFR-TARHEEL-62-050220 5-2-20 23:49 62 83 86 130 1,912,800,000 --20 21 31
Q1 CFR-TARHEEL-83-050620 5-6-20 11:49 83 51 51 74 2,577,100,000 --12 12 18
Q1 CFR-TARHEEL-83-051120 5-9-20 11:49 83 79 82 110 1,755,700,000 --13 14 19
Q2 CFR-TARHEEL-83-051320 5-13-20 9:49 83 140 140 190 575,460,000 --7.6 7.8 11
Q2 CAP2Q20-CFR-TARHEEL-051420 5-14-20 8:55 0 190 200 270 --1,540 8.3 8.7 12
Q2 CAP2Q20-TARHEEL-24-051820 5-14-20 20:50 24 180 190 250 125,860,000 --7.4 7.8 11
Q2 CFR-TARHEEL-83-051620 5-16-20 19:49 83 190 190 260 417,990,000 --7.5 7.6 10
Q2 CFR-TARHEEL-83-052020 5-20-20 8:49 83 260 260 340 384,660,000 --9.5 9.5 12
Q2 CFR-TARHEEL-052520 5-25-20 10:15 0 4.2 4.2 9.6 --23,500 2.8 2.8 6.4
Q2 CFR-TARHEEL-052920 5-29-20 9:10 0 11 11 11 --15,500 4.8 4.8 4.8
Q2 CFR-TARHEEL-060120 6-1-20 14:25 0 9.2 9.2 15 --23,200 6 6 9.9
Q2 CFR-TARHEEL-060120-D 6-1-20 14:25 0 11 11 13 --23,200 7.2 7.2 8.5
Q2 CFR-TARHEEL-060520 6-5-20 10:55 0 47 47 53 --14,700 20 20 22
Q2 CFR-TARHEEL-39-060820 6-8-20 21:06 82 45 45 58 3,650,600,000 --16 16 20
Q2 CFR-TARHEEL-83-061220 6-12-20 8:06 82 72 72 93 2,027,900,000 --14 14 18
Q2 CFR-TARHEEL-83-061520 6-15-20 19:06 82 75 75 88 2,054,000,000 --15 15 17
Q2 CFR-TARHEEL-83-061920 6-19-20 6:06 82 90 90 100 3,096,900,000 --27 27 30
Q2 CFR-TARHEEL-83-062220 6-22-20 17:06 82 40 40 49 4,194,300,000 --16 16 20
Q2 CFR-TARHEEL-83-062620 6-26-20 4:06 82 79 79 110 2,464,400,000 --19 19 25
Q2 CFR-TARHEEL-83-062920 6-29-20 15:06 82 120 120 160 1,286,000,000 --15 15 19
Q3 CFR-TARHEEL-65-070220 7-2-20 8:06 64 84 87 100 584,870,000 --6 6.3 7.4
Q3 CFR-TARHEEL-24-070320 7-3-20 7:29 24 150 150 210 204,760,000 --10 10 14
Q3 CFR-TARHEEL-24-070720 7-7-20 7:29 24 190 190 250 166,590,000 --10 10 14
Q3 CFR-TARHEEL-24-071020 7-10-20 11:01 24 150 150 200 215,400,000 --11 11 14
Q3 CFR-TARHEEL-24-071020-D 7-10-20 11:01 24 150 160 210 215,400,000 --11 11 15
Q3 CFR-TARHEEL-24-071320 7-13-20 23:01 24 140 150 210 216,310,000 --9.9 10 15
Q3 CFR-TARHEEL-24-071620 7-16-20 23:01 24 160 170 210 180,990,000 --9.5 10 12
Q3 CFR-TARHEEL-24-072020 7-20-20 23:01 24 170 180 180 163,050,000 --9.1 9.5 9.5
Q3 CFR-TARHEEL-24-072220 7-22-20 23:01 24 99 100 150 165,240,000 --5.4 5.6 7.9
Q3 CFR-TARHEEL-24-072320 7-23-20 23:01 24 150 160 200 143,600,000 --7.1 7.3 9.5
Q3 CFR-TARHEEL-12-072720 7-27-20 11:01 11 78 81 110 108,840,000 --6.1 6.3 8.4
Quarter
Concentrations (ng/L)Mass Discharge (mg/s)Total Volume
(ft3)4Field Sample ID Collection
Date
Hours
Composited1
Instantaneous
Flow Rate
(ft3/s)5
TR0795 Page 1 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 13
SUMMARY OF TOTAL PFAS MASS DISCHARGE AT TARHEEL FERRY ROAD BRIDGE
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC P.C.
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Quarter
Concentrations (ng/L)Mass Discharge (mg/s)Total Volume
(ft3)4Field Sample ID Collection
Date
Hours
Composited1
Instantaneous
Flow Rate
(ft3/s)5
Q3 CAP3Q20-CFR-TARHEEL-072820 7-28-20 16:20 0 75 78 78 --2,780 5.9 6.1 6.1
Q3 CAP3Q20-CFR-TARHEEL-24-072920 7-29-20 23:01 24 94 97 120 247,120,000 --7.6 7.9 9.5
Q3 CFR-TARHEEL-24-073020 7-30-20 23:01 24 78 81 99 335,190,000 --8.6 8.9 11
Q3 CFR-TARHEEL-080320 8-3-20 14:50 0 110 120 140 --2,450 7.6 8.3 9.7
Q3 CFR-TARHEEL-080420 8-4-20 12:30 0 210 210 240 --4,250 25 25 29
Q3 CFR-TARHEEL-24-080620 8-6-20 22:55 24 21 21 24 760,600,000 --5.2 5.2 5.9
Q3 CFR-TARHEEL-24-081020 8-10-20 21:56 24 36 36 36 507,950,000 --6 6 6
Q3 CFR-TARHEEL-24-081220 8-12-20 23:01 24 46 46 72 672,600,000 --10 10 16
Q3 CFR-TARHEEL-24-081720 8-17-20 23:01 24 25 25 35 1,107,700,000 --9.1 8.9 13
Q3 CFR-TARHEEL-24-082020 8-20-20 23:01 24 47 47 64 750,330,000 --12 11 16
Q3 CFR-TARHEEL-24-082520 8-25-20 23:01 24 58 58 58 529,670,000 --10 10 10
Q3 CFR-TARHEEL-082720 8-27-20 11:18 0 130 130 150 --2,850 23 23 27
Q3 CFR-TARHEEL-082720-D 8-27-20 11:18 0 130 130 160 --2,850 23 23 28
Q3 CFR-TARHEEL-083120 8-31-20 13:30 0 200 200 250 --1,840 35 35 44
Q3 CFR-TARHEEL-24-090320 9-3-20 23:01 24 44 44 56 515,400,000 --7.4 7.5 9.5
Q3 CFR-TARHEEL-24-090720 9-7-20 23:01 24 59 59 74 255,760,000 --4.9 5 6.2
Q3 CFR-TARHEEL-24-091020 9-10-20 23:01 24 160 160 220 146,080,000 --7.7 7.6 11
Q3 CFR-TARHEEL-24-091420 9-14-20 23:01 24 84 88 120 170,490,000 --4.7 4.9 6.5
Q3 CFR-TARHEEL-24-091720 9-17-20 23:01 24 100 110 150 135,600,000 --4.4 4.9 6.8
Q3 CFR-TARHEEL-11-091820 9-18-20 10:01 10 160 170 280 104,290,000 --13 14 23
Q3 CFR-TARHEEL-24-092120 9-21-20 23:01 24 58 58 67 570,840,000 --11 11 13
Q3 CFR-TARHEEL-24-092420-2 9-24-20 23:01 24 69 69 80 382,980,000 --8.7 8.6 10
Q3 CFR-TARHEEL-24-092520 9-25-20 23:01 24 70 70 84 382,150,000 --8.8 8.8 11
Q3 CFR-TARHEEL-24-092620 9-26-20 23:01 24 70 70 83 703,470,000 --16 16 19
Q3 CFR-TARHEEL-24-092820 9-28-20 23:01 24 51 51 58 841,660,000 --14 14 16
Q3 CFR-TARHEEL-24-092920 9-29-20 23:01 24 16 16 22 792,600,000 --4.2 4.2 5.6
Q3 CFR-TARHEEL-24-093020 9-30-20 23:01 24 74 74 96 971,470,000 --24 23 31
Q4 CFR-TARHEEL-18-100120 10-1-20 17:01 18 15 15 15 847,260,000 --5.6 5.5 5.5
Q4 CFR-TARHEEL-9-100620 10-6-20 23:30 9 24 24 29 126,380,000 --2.7 2.7 3.2
Q4 CFR-TARHEEL-24-100820 10-8-20 16:30 24 39 39 47 231,100,000 --3 3 3.5
Q4 CFR-TARHEEL-24-101220 10-12-20 23:01 24 170 170 220 352,550,000 --20 20 25
Q4 CFR-TARHEEL-24-101520 10-15-20 23:01 24 26 26 35 745,010,000 --6.3 6.4 8.5
Q4 CFR-TARHEEL-24-101920 10-19-20 23:01 24 32 32 42 632,270,000 --6.6 6.5 8.7
Q4 CFR-TARHEEL-24-102220 10-22-20 23:01 24 51 51 51 423,540,000 --7.1 7 7
Q4 CFR-TARHEEL-12-103020 10-30-20 23:01 24 56 60 82 325,130,000 --6 6.4 8.7
Q4 CFR-TARHEEL-24-103120 10-31-20 23:01 24 70 74 92 351,490,000 --8.1 8.5 11
Q4 CFR-TARHEEL-24-110220 11-2-20 23:01 24 51 54 58 547,950,000 --9.2 9.7 10
Q4 CFR-TARHEEL-24-110520 11-5-20 23:01 24 65 65 71 362,140,000 --7.7 7.8 8.4
Q4 CFR-TARHEEL-24-110920 11-9-20 23:01 24 90 93 130 198,700,000 --5.9 6 8.2
Q4 CFR-TARHEEL-24-111120 11-11-20 23:01 24 74 77 110 193,470,000 --4.7 4.9 7.1
Q4 CFR-TARHEEL-20-111220 11-12-20 19:01 20 240 240 310 538,380,000 --51 51 66
Q4 CFR-TARHEEL-111320 11-13-20 14:10 0 6.1 6.1 6.1 --30,500 1.1 1.1 1.1
Q4 CFR-TARHEEL-111820 11-18-20 12:25 0 22 22 31 --16,200 3.9 3.9 5.5
TR0795 Page 2 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 13
SUMMARY OF TOTAL PFAS MASS DISCHARGE AT TARHEEL FERRY ROAD BRIDGE
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC P.C.
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Total
Attachment C2
Total Table 3+
(17 compounds)3
Total Table 3+
(20 compounds)
Quarter
Concentrations (ng/L)Mass Discharge (mg/s)Total Volume
(ft3)4Field Sample ID Collection
Date
Hours
Composited1
Instantaneous
Flow Rate
(ft3/s)5
Q4 CFR-TARHEEL-112020 11-20-20 11:06 0 24 24 36 --13,000 4.2 4.2 6.4
Q4 CFR-TARHEEL-24-112420 11-24-20 23:01 24 2.3 2.3 2.3 975,960,000 --0.74 0.74 0.74
Q4 CFR-TARHEEL-24-112620 11-26-20 23:01 24 380 380 390 691,990,000 --86 86 87
Q4 CFR-TARHEEL-24-113020 11-30-20 23:01 24 94 94 120 541,810,000 --17 17 20
Q4 CFR-TARHEEL-24-120320 12-3-20 23:01 24 46 46 53 1,088,100,000 --16 17 19
Q4 CFR-TARHEEL-24-120720 12-7-20 23:01 24 25 25 40 899,500,000 --7.4 7.2 12
Q4 CFR-TARHEEL-24-121020 12-10-20 23:01 24 29 29 29 756,860,000 --7.2 7.3 7.3
Q4 CFR-TARHEEL-24-121320 12-13-20 23:01 24 43 43 60 427,890,000 --6 6.1 8.4
Q4 CFR-TARHEEL-12-121420 12-14-20 11:59 11 48 48 66 187,550,000 --6.4 6.5 8.8
Q4 CAP1220-TARHEEL-121620 12-15-20 16:11 0 70 74 84 --6,270 12 13 15
Q4 CFR-TARHEEL-121720 12-17-20 12:29 0 13 13 20 --14,200 2.3 2.3 3.5
Q4 CFR-TARHEEL-122120 12-21-20 13:52 0 18 18 24 --14,000 3.2 3.2 4.2
Q4 CFR-TARHEEL-122320 12-23-20 9:30 0 7.1 7.1 10 --14,400 1.3 1.3 1.8
Q4 CFR-TARHEEL-122420 12-24-20 19:20 0 38 38 62 --11,100 6.7 6.7 11
Q4 CFR-TARHEEL-122820 12-28-20 15:00 0 5.5 5.5 7.5 --18,500 0.97 0.97 1.3
Q4 CFR-TARHEEL-123020 12-30-20 10:56 0 21 21 34 --14,500 3.7 3.7 6
Notes:
1 - Samples with a compositing duration of zero (0) hours are grab samples.
2 - Total flow volume is determined based on measurements taken over the sample collection period.
3 - For samples with a duration of zero (0) hours, i.e., grab samples, the instantaneous flow rate was used to calculated the mass discharge.
4 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
5 - Total Table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
-- - not applicable
ng/L - nanograms per liter
ft3 - cubic feet
mg/s - milligrams per second
TR0795 Page 3 of 3 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 14
PFAS MASS LOADING MODEL POTENTIAL PATHWAYS
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants NC P.C.
Transport
Pathway
Number
Potential PFAS Transport Pathway Analytical Data Source for Mass Loading Model1 Flow Data Source for Mass Loading Model1
1 Upstream River and Groundwater
Measured from Cape Fear River Mile 76 sample collected in December
2020 as reported in Table 8.
Measured flow rates from USGS gauging station at W.O. Huske Dam
during December 2020 volumetrically adjusted for flow pathways between
River Mile 76 and W.O. Huske Dam2.
2 Willis Creek Measured from Willis Creek sample collected in December 2020 as
reported in Table 8.
Measured flow rates through point velocity method during December
2020 as reported in Appendix D.
3 Aerial Deposition on River Estimated from air deposition modeling3.Estimated from air deposition modeling3.
4 Outfall 002 Measured from Outfall 002 sample collected in December 2020 as reported
in Table 8.
Measured daily Outfall 002 flow rates recorded in Facility
discharge monitoring reports, summarized in Appendix D.
5 Onsite Groundwater Measured from monitoring well samples collected in December 2020 as
reported in Table 10.
Estimated as the sum of the mass flux from the Black Creek Aquifer
calculated from a transect along the Cape Fear River. Further details
and supporting calculations provided in Appendix G.
6 Seeps Measured from Seeps A, B, C, and D samples collected in December 2020
as reported in Table 8.
Measured flow rates through point velocity method and flumes
during December 2020 as reported in Appendix D.
7 Old Outfall 002 Measured from Old Outfall 002 sample collected in December 2020 as
reported in Table 8.
Measured flow rates through point velocity method during
December 2020 as reported in Appendix D.
8 Adjacent and Downstream Groundwater
Estimated using a scaling factor applied to upstream mass discharge. See
Section 7.2.6 for details.
Estimated using a scaling factor applied to upstream mass discharge. See
Appendix I for details.
9 Georgia Branch Creek Measured from Georgia Branch Creek sample collected in December 2020
as reported in Table 8.
Measured flow rates through point velocity method during December
2020 as reported in Appendix D.
Notes:
1 - Flow and concentration data are multiplied together to estimate the PFAS mass discharge in the Cape Fear River originating from each pathway.
2 - Cape Fear River flow rates measured at USGS gauging station #02105500 located at William O Huske Lock & Dam accessed from https://waterdata.usgs.gov on 2021-01-15 at 11:00 EDT.
3 - ERM, 2018. Modeling Report: HFPO-DA Atmospheric Deposition and Screening Groundwater Effects. 27 April 2018.
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15A
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1 1 2 4
Pathway Name Upstream River Water and Willis Creek Outfall 0023 Onsite Groundwater - Lower Onsite Groundwater - Upper
Flow (MG)4173 15.3 17 ----
Instantaneous Flow (ft3/sec)----------
Program CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
Location ID CFR-MILE-7610 WC-1 OUTFALL 002 ----
Field Sample ID CAP1220-CFR-RM-76-121520 CAP1220-WC-1-22-121620 CAP1220-OUTFALL-002-24-121620 ----
Sample Date2 12/15/2020 12/16/2020 12/16/2020 ----
Sample Delivery Group (SDG)320-68082-1/320-68082-3 320-68083-1 320-68081-1
Lab Sample ID 320-68082-1 320-68083-1 320-68081-2
Sample Type Grab 24-Hour Composite 24-Hour Composite ----Table 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid ND 0.16 0.14 0.14 0.17
PFMOAA ND 0.22 0.004 1.0 1.4
PFO2HxA ND 0.15 0.011 0.26 0.35
PFO3OA ND 0.023 0.004 0.088 0.13
PFO4DA ND 0.006 0.004 0.049 0.071
PFO5DA ND ND 0.004 0.007 0.010
PMPA 1.2 0.22 0.015 0.086 0.102
PEPA ND 0.054 0.010 0.027 0.032
PS Acid ND ND 0.039 0.002 0.003
Hydro-PS Acid ND 0.006 0.005 0.004 0.006
R-PSDA ND 0.059 0.057 0.007 0.009
Hydrolyzed PSDA ND 0.087 0.075 0.010 0.015
R-PSDCA ND ND ND 0.000 0.001
NVHOS ND 0.005 ND 0.009 0.013
EVE Acid ND ND 0.13 0.001 0.001
Hydro-EVE Acid ND 0.002 0.006 0.003 0.005
R-EVE ND 0.021 0.017 0.004 0.005
PES ND ND ND 0.000 0.000
PFECA B ND ND ND 0.000 0.000
PFECA-G ND ND ND 0.000 0.000
Total Attachment C Mass Discharge7,8 1.2 0.87 0.23 1.7 2.3
Total Table 3+ Mass Discharge (17 compounds)7,9 1.2 0.87 0.38 1.7 2.3
Total Table 3+ Mass Discharge (20 Compounds)7 1.2 1.0 0.52 1.7 2.3
5
TR0795 Page 1 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15A
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
6A 6B 6C 6D 6E
Seep A Seep B Seep C Seep D Lock and Dam Seep
0.13 0.19 0.04 0.18 0.02
----------
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
SEEP-A SEEP-B SEEP-C SEEP-D Lock and Dam Seep
CAP1220-SEEP-A-24-121620 CAP1220-SEEP-B-21-121620 CAP1220-SEEP-C-24-121620 CAP1220-SEEP-D-24-121620 CAP1220-LOCK-DAM-SEEP-121520
12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/15/2020
320-68083-1 320-68083-1 320-68083-1 320-68084-1 320-68081-1
320-68083-2 320-68083-3 320-68083-4 320-68084-1 320-68081-1
24-Hour Composite 24-Hour Composite 24-Hour Composite 24-Hour Composite Grab
0.14 0.18 0.059 0.11 0.007
0.56 1.3 0.46 0.62 0.077
0.21 0.30 0.12 0.16 0.016
0.076 0.067 0.040 0.046 0.006
0.044 0.012 0.007 0.011 0.001
0.025 0.003 ND 0.001 ND
0.11 0.25 0.022 0.048 0.004
0.041 0.11 0.007 0.016 0.001
0.028 0.020 ND ND ND
0.008 0.006 0.001 0.002 0.000
0.015 0.030 0.004 0.007 0.001
0.12 0.19 0.006 0.011 0.000
0.000 0.001 0.000 0.000 ND
0.006 0.019 0.004 0.005 0.001
0.006 0.030 ND ND ND
0.008 0.014 0.004 0.007 0.000
0.008 0.021 0.004 0.007 0.000
0.000 0.000 0.000 0.000 ND
ND ND ND ND ND
ND ND ND ND ND
1.2 2.2 0.72 1.0 0.11
1.3 2.3 0.72 1.0 0.11
1.4 2.5 0.74 1.0 0.11
TR0795 Page 2 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15A
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
7 9
Old Outfall 002 Georgia Branch Creek
0.62 8.9
----
Old Outfall 002 Treatment System CAP SW Sampling 4Q20
Old Outfall 002 Influent GBC-1
Influent-1220 CAP1220-GBC-1-121520
12/8/2020 12/15/2020
410-23337-1 320-68084-1
410-23337-2 320-68084-4
Grab Grab
0.122 0.15 1.2 1.2
1.36 0.026 5.62 6.0
0.326 0.097 1.7 1.8
0.079 0.013 0.44 0.48
0.025 0.004 0.16 0.19
0.016 0.001 0.06 0.06
0.128 0.24 2.3 2.3
0.038 0.066 0.37 0.37
0.024 ND 0.11 0.11
0.008 0.009 0.05 0.05
0.018 0.047 0.24 0.25
0.054 ND 0.55 0.56
0.000 ND 0.00 0.00
0.012 0.001 0.06 0.07
0.002 ND 0.17 0.17
0.004 ND 0.05 0.05
0.006 0.013 0.10 0.10
ND ND 0.00 0.00
ND ND 0.00 0.00
ND ND 0.00 0.00
2.12 0.58 11.9 12.5
2.15 0.58 12.2 12.9
2.23 0.66 13.1 13.7
Sum of All Pathways - Upper BoundSum of All Pathways - Lower Bound
TR0795 Page 3 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15A
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
------
Tar Heel Ferry Road Bridge5 Tar Heel Ferry Road Bridge5 Tar Heel Ferry Road Bridge
----5,710
10,300 6,130 --
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 Tarheel Grab Sample Average
TARHEEL TARHEEL TARHEEL
CAP1220-TARHEEL-121620 CAP1220-CFR-TARHEEL-121520 --
12/16/2020 12/15/2020 12/15/2020 & 12/16/2020
320-68080-1 320-68082-1 320-68082-1
320-68080-1 320-68082-4 320-68082-4
Grab Grab Grab
3.2 1.3 2.3
5.8 2.4 4.3
2.8 1.5 2.3
0.76 ND 0.65
ND ND ND
ND ND ND
7.9 4.3 6.5
ND ND ND
ND ND ND
ND ND ND
ND 2.3 3.3
2.7 1.5 2.2
ND ND ND
ND ND ND
1.2 ND 1.0
ND ND ND
ND ND ND
ND ND ND
ND ND ND
ND ND ND
20.4 9.5 15.6
21.6 9.5 16.1
24.5 13.4 20.1
TR0795 Page 4 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15A
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
----
Bladen Bluff5 Kings Bluff5 Notes:
----
6,420 7,650
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
CFR-BLADEN CFR-KINGS
CAP1220-CFR-BLADEN-121520 CAP1220-CFR-KINGS-121620
12/15/2020 12/16/2020
320-68082-1 320-68082-1
320-68082-2 320-68082-3
Grab Grab
1.3 1.9
2.5 4.5
1.4 2.4
ND 0.4
ND ND
ND ND
4.4 6.3
ND ND
ND ND
ND ND
ND 4.5
1.3 2.2
ND ND
1.3 1.4
ND ND 8 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
ND ND
ND 2.4
ND ND 10 - CFR-MILE-76 was reanalyzed using Method Table 6 for PMPA and PEPA.
ND ND Bold - Analyte detected above associated reporting limit
ND ND SOP - Standard Operating Procedure
9.6 15.6 mg/s - milligrams per second
10.9 17.1
12.4 26.0
9 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and
R-EVE.
6 - Mass discharge by analyte is calculated based on Table 3+ concentrations in Tables
8 and 10 and 24-hour flow volumes reported in Table 9.
7 - Total PFAS mass discharge is based on the summed Total PFAS concentrations
reported in Table 8 and Table 10, which are rounded to two significant figures.
1 - Pathway 3 (Aerial Deposition on Water Features) and Pathway 8 (Offsite Adjacent
and Downstream Groundwater) are not included in this table. Loading from Pathway 3
was estimated using relative concentration ratios from offsite wells, and loading from
Pathway 8 was estimated by scaling to the upstream offsite groundwater loading.
Further details are provided in Appendices H and I.
2 - For composite samples, the end of the composite sample time period is listed as the
sample date.3 - Total Table 3+ concentrations at the Intake River Water at the Facility are
subtracted from Outfall 002 concentrations to compute the mass discharge at Outfall
002.
4 - Mass discharge for Onsite Groundwater (Pathway 5) is determined using
calculations described in Appendix G. The lower and upper bounds on the mass
discharge was calculated using the upper and lower hydraulic gradient in the Black
Creek Aquifer as described in Appendix G.
5 - Mass discharge values for grab samples collected at Tar Heel Ferry Road Bridge,
Bladen Bluff, and Kings Bluff are determined based on instantaneous flow rates.
TR0795 Page 5 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15B
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1 1 2 4
Pathway Name Upstream River Water and Willis Creek Outfall 0023 Onsite Groundwater - Lower Onsite Groundwater - Upper
Flow (MG)4173 15.3 17 ----
Instantaneous Flow (ft3/sec)----------
Program CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
Location ID CFR-MILE-7610 WC-1 OUTFALL 002 ----
Field Sample ID CAP1220-CFR-RM-76-121520 CAP1220-WC-1-22-121620 CAP1220-OUTFALL-002-24-121620 ----
Sample Date and Time2 12/15/2020 12/16/2020 12/16/2020 ----
Sample Delivery Group (SDG)320-68082-1/320-68082-3 320-68083-1 320-68081-1
Lab Sample ID 320-68082-1 320-68083-1 320-68081-2
Sample Type Grab 24-Hour Composite 24-Hour Composite ----Table 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid ND 0.16 0.14 0.14 0.17
PFMOAA ND 0.22 0.004 1.0 1.4
PFO2HxA ND 0.15 0.011 0.26 0.35
PFO3OA ND 0.023 0.004 0.088 0.13
PFO4DA ND 0.006 0.004 0.049 0.071
PFO5DA ND ND 0.004 0.007 0.010
PMPA 1.2 0.22 0.015 0.086 0.102
PEPA ND 0.054 0.010 0.027 0.032
PS Acid ND ND 0.039 0.002 0.003
Hydro-PS Acid ND 0.006 0.005 0.004 0.006
R-PSDA ND 0.059 0.057 0.007 0.009
Hydrolyzed PSDA ND 0.087 0.075 0.010 0.015
R-PSDCA ND ND ND 0.000 0.001
NVHOS ND 0.005 ND 0.009 0.013
EVE Acid ND ND 0.13 0.001 0.001
Hydro-EVE Acid ND 0.002 0.006 0.003 0.005
R-EVE ND 0.021 0.017 0.004 0.005
PES ND ND ND 0.000 0.000
PFECA B ND ND ND 0.000 0.000
PFECA-G ND ND ND 0.000 0.000
Total Attachment C Mass Discharge7,8 1.2 0.87 0.23 1.7 2.3
Total Table 3+ Mass Discharge (17 compounds)7,9 1.2 0.87 0.38 1.7 2.3
Total Table 3+ Mass Discharge (20 Compounds)7 1.2 1.0 0.52 1.7 2.3
5
TR0795 Page 1 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15B
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date and Time2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
6A 6B 6C 6D 6E
Seep A Seep B Seep C Seep D Lock and Dam Seep
0.13 0.19 0.04 0.18 0.02
----------
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
SEEP-A SEEP-B SEEP-C SEEP-D Lock and Dam Seep
CAP1220-SEEP-A-24-121620 CAP1220-SEEP-B-21-121620 CAP1220-SEEP-C-24-121620 CAP1220-SEEP-D-24-121620 CAP1220-LOCK-DAM-SEEP-121520
12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/15/2020
320-68083-1 320-68083-1 320-68083-1 320-68084-1 320-68081-1
320-68083-2 320-68083-3 320-68083-4 320-68084-1 320-68081-1
24-Hour Composite 24-Hour Composite 24-Hour Composite 24-Hour Composite Grab
0.14 0.18 0.059 0.11 0.007
0.56 1.3 0.46 0.62 0.077
0.21 0.30 0.12 0.16 0.016
0.076 0.067 0.040 0.046 0.006
0.044 0.012 0.007 0.011 0.001
0.025 0.003 ND 0.001 ND
0.11 0.25 0.022 0.048 0.004
0.041 0.11 0.007 0.016 0.001
0.028 0.020 ND ND ND
0.008 0.006 0.001 0.002 0.000
0.015 0.030 0.004 0.007 0.001
0.12 0.19 0.006 0.011 0.000
0.000 0.001 0.000 0.000 ND
0.006 0.019 0.004 0.005 0.001
0.006 0.030 ND ND ND
0.008 0.014 0.004 0.007 0.000
0.008 0.021 0.004 0.007 0.000
0.000 0.000 0.000 0.000 ND
ND ND ND ND ND
ND ND ND ND ND
1.2 2.2 0.72 1.0 0.11
1.3 2.3 0.72 1.0 0.11
1.4 2.5 0.74 1.0 0.11
TR0795 Page 2 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15B
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date and Time2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
7 9
Old Outfall 002 Georgia Branch Creek
0.62 8.9
----
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
OLDOF-1 GBC-1
CAP1220-OLDOF-1-7-121520 CAP1220-GBC-1-121520
12/15/2020 12/15/2020
320-68080-1 320-68084-1
320-68080-2 320-68084-4
Grab Grab
0.006 0.15 1.1 1.1
0.03 0.026 4.29 4.7
0.011 0.097 1.3 1.4
0.003 0.013 0.37 0.40
0.001 0.004 0.14 0.16
0.000 0.001 0.04 0.04
0.005 0.24 2.1 2.2
0.002 0.066 0.33 0.34
ND ND 0.09 0.09
0.000 0.009 0.04 0.04
0.000 0.047 0.23 0.23
0.001 ND 0.50 0.50
ND ND 0.00 0.00
0.000 0.001 0.05 0.06
ND ND 0.17 0.17
0.000 ND 0.04 0.05
0.000 0.013 0.10 0.10
ND ND 0.00 0.00
ND ND 0.00 0.00
ND ND 0.00 0.00
0.06 0.58 9.8 10.5
0.06 0.58 10.2 10.8
0.06 0.66 10.9 11.5
Sum of All Pathways - Upper BoundSum of All Pathways - Lower Bound
TR0795

Page 3 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15B
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date and Time2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
------
Tar Heel Ferry Road Bridge5 Tar Heel Ferry Road Bridge5 Tar Heel Ferry Road Bridge
----5,710
10,300 6,130 --
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20 Tarheel Grab Sample Average
TARHEEL TARHEEL TARHEEL
CAP1220-TARHEEL-121620 CAP1220-CFR-TARHEEL-121520 --
12/16/2020 12/15/2020 12/15/2020 & 12/16/2020
320-68080-1 320-68082-1 320-68082-1
320-68080-1 320-68082-4 320-68082-4
Grab Grab Grab
3.2 1.3 2.3
5.8 2.4 4.3
2.8 1.5 2.3
0.76 ND 0.65
ND ND ND
ND ND ND
7.9 4.3 6.5
ND ND ND
ND ND ND
ND ND ND
ND 2.3 3.3
2.7 1.5 2.2
ND ND ND
ND ND ND
1.2 ND 1.0
ND ND ND
ND ND ND
ND ND ND
ND ND ND
ND ND ND
20.4 9.5 15.6
21.6 9.5 16.1
24.5 13.4 20.1
TR0795 Page 4 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 15B
ESTIMATED 2020 QUARTER 4 EVENT TABLE 3+ PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Pathway Number1
Pathway Name
Flow (MG)
Instantaneous Flow (ft3/sec)
Program
Location ID
Field Sample ID
Sample Date and Time2
Sample Delivery Group (SDG)
Lab Sample ID
Sample TypeTable 3+ Lab SOP Mass Discharge 6 (mg/s)
Hfpo Dimer Acid
PFMOAA
PFO2HxA
PFO3OA
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 Attachment C Mass Discharge7,8
Total Table 3+ Mass Discharge (17 compounds)7,9
Total Table 3+ Mass Discharge (20 Compounds)7
----
Bladen Bluff5 Kings Bluff5 Notes:
----
6,420 7,650
CAP SW Sampling 4Q20 CAP SW Sampling 4Q20
CFR-BLADEN CFR-KINGS
CAP1220-CFR-BLADEN-121520 CAP1220-CFR-KINGS-121620
12/15/2020 12/16/2020
320-68082-1 320-68082-1
320-68082-2 320-68082-3
Grab Grab
1.3 1.9
2.5 4.5
1.4 2.4
ND 0.4
ND ND
ND ND
4.4 6.3
ND ND
ND ND
ND ND
ND 4.5
1.3 2.2
ND ND
1.3 1.4
ND ND 8 - Total Attachment C does not include Perfluorohepthanoic acid (PFHpA).
ND ND
ND 2.4
ND ND 10 - CFR-MILE-76 was reanalyzed using Method Table 6 for PMPA and PEPA.
ND ND Bold - Analyte detected above associated reporting limit
ND ND SOP - Standard Operating Procedure
9.6 15.6 mg/s - milligrams per second
10.9 17.1
12.4 26.0
5 - Mass discharge values for grab samples collected at Tar Heel Ferry Road Bridge, Bladen
Bluff, and Kings Bluff are determined based on instantaneous flow rates.
6 - Mass discharge by analyte is calculated based on Table 3+ concentrations in Tables 8
and 10 and 24-hour flow volumes reported in Table 9.
7 - Total PFAS mass discharge is based on the summed Total PFAS concentrations
reported in Table 8 and Table 10, which are rounded to two significant figures.
9 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-
EVE.
1 - Pathway 3 (Aerial Deposition on Water Features) and Pathway 8 (Offsite Adjacent and
Downstream Groundwater) are not included in this table. Loading from Pathway 3 was
estimated using relative concentration ratios from offsite wells, and loading from Pathway 8
was estimated by scaling to the upstream offsite groundwater loading. Further details are
provided in Appendices H and I.
2 - For composite samples, the end of the composite sample time period is listed as the
sample date.
3 - Total Table 3+ concentrations at the Intake River Water at the Facility are subtracted
from Outfall 002 concentrations to compute the mass discharge at Outfall 002.
4 - Mass discharge for Onsite Groundwater (Pathway 5) is determined using calculations
described in Appendix G. The lower and upper bounds on the mass discharge was
calculated using the upper and lower hydraulic gradient in the Black Creek Aquifer as
described in Appendix G.
TR0795 Page 5 of 5 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 16A
SUMMARY OF TOTAL PFAS MASS DISCHARGE BY PATHWAY BEFORE REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Concentration
(ng/L)
Mass Loading
(mg/s)
Concentration
(ng/L)
Mass Loading
(mg/s)
Concentration
(ng/L)
Mass Loading
(mg/s)
1 Upstream River Water and Groundwater2 4,173 6 1.2 6.3 1.2 6.3 1.2
2 Willis Creek 15.31 1,300 0.87 1,300 0.87 1,500 1.01
3 Aerial Deposition on Water Features ----0.01 --0.01 --0.01
4 Outfall 0023 17 309 0.23 503 0.38 700 0.52
Onsite Groundwater (Lower Bound)4 ----1.67 --1.69 --1.70
Onsite Groundwater (Upper Bound)4 ----2.3 --2.3 --2.3
6A Seep A 0.13 210,000 1.23 220,000 1.29 240,000 1.40
6B Seep B 0.19 260,000 2.20 270,000 2.28 300,000 2.53
6C Seep C 0.04 420,000 0.72 420,000 0.72 430,000 0.74
6D Seep D 0.18 130,000 1.01 130,000 1.01 130,000 1.01
6E Lock and Dam Seep 0.02 110,000 0.11 110,000 0.11 110,000 0.11
7 Old Outfall 0027 0.62 78,000 2.12 79,000 2.15 82,000 2.23
8 Offsite Adjacent and Downstream Groundwater ----0.43 --0.43 --0.43
9 Georgia Branch Creek 8.89 1,500 0.58 1,500 0.58 1,700 0.66
Calculated Total Table 3+ Loading (mg/s) at Tar Heel (Lower Bound)12.3 12.7 13.5
Calculated Total Table 3+ Loading (mg/s) at Tar Heel (Upper Bound)13.0 13.3 14.1
Measured Total Table 3+ Loading (mg/s) at Tar Heel8 5,710 63 15.6 65 16.1 81 20.1
Notes:
6 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
Total Table 3+ (20 compounds)
5 - Mass dicharge calculations for Total Attachment C does not include Perfluorohepthanoic
acid (PFHpA).
8 - For the Q4 sampling event, a composite sample could not be collected because of the high
river stage. Instead two grab samples were collected within a 24 hour period on December 15
and 16, 2020. The average concentrations between these grab samples were used in the
calculation of mass dischrage.
7 - For Q4 2020, the concentrations from the Old Outfall 002 sample collected downgradient
from the treatment system in December 2020 were used to calculate the After Remedy mass
discharge for this pathway.
5
1 - Total flow volume is determined based on measurements taken over 24-hour sample
collection period for all locations except Seeps A through C, Lock and Dam Seep, Old Outfall
002, Georgia Branch Creek and Willis Creek. At these locations, the total flow volume was
estimated based on the instantaneous flow measurement.
2 - The volumetric flow rate for upstream river water and groundwater was estimated by
subtracting inflows from Willis Creek, upwelling groundwater, seeps to the river, and Outfall
002 and by adding the river water intake from Chemours to the flow rate measurement from the
W.O. Huske Dam. The December 2020 sample collected at CFR-MILE-76 was reanalyzed
using Method Table 6 for PMPA and PEPA.
3 - Total PFAS concentrations at the Intake River Water at Facility location are subtracted from
Outfall 002 concentrations to compute the mass discharge at Outfall 002.
4 - Mass Discharge for Onsite Groundwater was determined using calculations described in
Appendix G. The lower and upper bounds on the mass discharge were calculated calculated
using two different contour elevation differences in the vicinity of the river frontage: a ten-foot
elevation difference (between the 40 and 50 ft contours) and a twenty-foot elevation difference
(between the 40 and 60 ft contours) as described in Appendix G.
Total Flow
Volume on
Sample Date
(MG)1
Total Attachment C5 Total Table 3+ (17 compounds)6
Pathway Pathway Name
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 16B
SUMMARY OF TOTAL PFAS MASS DISCHARGE BY PATHWAY AFTER REMEDIES
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Concentration
(ng/L)
Mass Loading
(mg/s)
Concentration
(ng/L)
Mass Loading
(mg/s)
Concentration
(ng/L)
Mass Loading
(mg/s)
1 Upstream River Water and Groundwater2 4,173 6 1.2 6.3 1.2 6.3 1.2
2 Willis Creek 15.31 1,300 0.87 1,300 0.87 1,500 1.01
3 Aerial Deposition on Water Features ----0.01 --0.01 --0.01
4 Outfall 0023 17 309 0.23 503 0.38 700 0.52
Onsite Groundwater (Lower Bound)4 ----1.67 --1.69 --1.70
Onsite Groundwater (Upper Bound)4 ----2.3 --2.3 --2.3
6A Seep A 0.13 210,000 1.23 220,000 1.29 240,000 1.40
6B Seep B 0.19 260,000 2.20 270,000 2.28 300,000 2.53
6C Seep C 0.04 420,000 0.72 420,000 0.72 430,000 0.74
6D Seep D 0.18 130,000 1.01 130,000 1.01 130,000 1.01
6E Lock and Dam Seep 0.02 110,000 0.11 110,000 0.11 110,000 0.11
7 Old Outfall 0027 0.62 2,100 0.06 2,200 0.06 2,200 0.06
8 Offsite Adjacent and Downstream Groundwater ----0.43 --0.43 --0.43
9 Georgia Branch Creek 8.89 1,500 0.58 1,500 0.58 1,700 0.66
Calculated Total Table 3+ Loading (mg/s) at Tar Heel (Lower Bound)10.3 10.6 11.3
Calculated Total Table 3+ Loading (mg/s) at Tar Heel (Upper Bound)10.9 11.2 12.0
Measured Total Table 3+ Loading (mg/s) at Tar Heel8 5,710 63 15.6 65 16.1 81 20.1
Notes:
6 - Total table 3+ (17 compounds) does not include R-PSDA, Hydrolyzed, PSDA, and R-EVE.
Total Table 3+ (20 compounds)
8 - For the Q4 sampling event, a composite sample could not be collected because of the high
river stage. Instead two grab samples were collected within a 24 hour period on December 15 and
16, 2020. The average concentrations between these grab samples were used in the calculation of
mass dischrage.
Total Table 3+ (17 compounds)6
5
Total Attachment C5
Pathway Pathway Name
Total Flow
Volume on Sample
Date (MG)1
7 - For Q4 2020, the Old Outfall 002 treatment system became operational and the concentrations
from the influent sample collected in December 2020 were used to calculate the Before Remedy
mass discharge for this pathway.
1 - Total flow volume is determined based on measurements taken over 24-hour sample collection
period for all locations except Seeps A through C, Lock and Dam Seep, Old Outfall 002, Georgia
Branch Creek and Willis Creek. At these locations, the total flow volume was estimated based on
the instantaneous flow measurement.
2 - The volumetric flow rate for upstream river water and groundwater was estimated by
subtracting inflows from Willis Creek, upwelling groundwater, seeps to the river, and Outfall 002
and by adding the river water intake from Chemours to the flow rate measurement from the W.O.
Huske Dam. The December 2020 sample collected at CFR-MILE-76 was reanalyzed using
Method Table 6 for PMPA and PEPA.
3 - Total PFAS concentrations at the Intake River Water at Facility location are subtracted from
Outfall 002 concentrations to compute the mass discharge at Outfall 002.
4 - Mass Discharge for Onsite Groundwater was determined using calculations described in
Appendix G. The lower and upper bounds on the mass discharge were calculated calculated using
two different contour elevation differences in the vicinity of the river frontage: a ten-foot elevation
difference (between the 40 and 50 ft contours) and a twenty-foot elevation difference (between the
40 and 60 ft contours) as described in Appendix G.
5 - Mass dicharge calculations for Total Attachment C does not include Perfluorohepthanoic acid
(PFHpA).
TR0795 Page 1 of 1 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 17
CAPE FEAR RIVER TOTAL PFAS RELATIVE
MASS DISCHRAGE PER PATHWAY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
Lower Upper Lower Upper
[1] Upstream River Water and Groundwater 0% 0% 0% 0%
[2] Willis Creek 4% 3% 5% 3%
[3] Aerial Deposition on Water Features <1% <1% <1% <1%
[4] Outfall 002 1% <1% 1% 1%
[5] Onsite Groundwater 5% 43% 5% 42%
[6] Seeps 56% 34% 57% 35%
[7] Old Outfall 002 30% 23% 28% 17%
[8] Offsite Adjacent and Downstream Groundwater 0% 0% 0% 0%
[9] Georgia Branch Creek 4% 2% 4% 2%
Notes:
Relative contributions per pathway are presented as a range, which
represents the upper and lower bound estimates.
1 - Model estimated Total PFAS mass discharge for April 2020 is in
Cape Fear River PFAS Mass Loading Assessment - First Quarter
2020 Report (Geosyntec, 2020b).
2 - Model estimated Total PFAS mass discharge for May 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Second Quarter
2020 Report (Geosyntec, 2020c).
3 - Model estimated Total PFAS mass discharge for July 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Third Quarter
2020 Report (Geosyntec, 2020e).
4 - Model estimated Total PFAS mass discharge for December 2020
is presented in this report.
5 - Mass dicharge calculations for Total Attachment C does not
include Perfluorohepthanoic acid (PFHpA).
7 - Mass discharges was estimated before and after remedies have
been implemented at the Transport Pathways. For Q4 2020, the Old
Outfall 002 treatment system became operational, therefore, the
concentrations from the influent and the location downgradient of the
treatment system were used to calculate the Before and After
Remedies mass discharge, respecitvely, for this pathway.
6 - Total table 3+ (17 compounds) does not include R-PSDA,
Hydrolyzed, PSDA, and R-EVE.
Pathway
Q1 2020 (April 2020)
(dry)1
Total Table 3+
(17 Compounds)6
Total Table 3+
(20 Compounds)
TR0795 Page 1 of 4 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 17
CAPE FEAR RIVER TOTAL PFAS RELATIVE
MASS DISCHRAGE PER PATHWAY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
[1] Upstream River Water and Groundwater
[2] Willis Creek
[3] Aerial Deposition on Water Features
[4] Outfall 002
[5] Onsite Groundwater
[6] Seeps
[7] Old Outfall 002
[8] Offsite Adjacent and Downstream Groundwater
[9] Georgia Branch Creek
Notes:
Relative contributions per pathway are presented as a range, which
represents the upper and lower bound estimates.
1 - Model estimated Total PFAS mass discharge for April 2020 is in
Cape Fear River PFAS Mass Loading Assessment - First Quarter
2020 Report (Geosyntec, 2020b).
2 - Model estimated Total PFAS mass discharge for May 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Second Quarter
2020 Report (Geosyntec, 2020c).
3 - Model estimated Total PFAS mass discharge for July 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Third Quarter
2020 Report (Geosyntec, 2020e).
4 - Model estimated Total PFAS mass discharge for December 2020
is presented in this report.
5 - Mass dicharge calculations for Total Attachment C does not
include Perfluorohepthanoic acid (PFHpA).
7 - Mass discharges was estimated before and after remedies have
been implemented at the Transport Pathways. For Q4 2020, the Old
Outfall 002 treatment system became operational, therefore, the
concentrations from the influent and the location downgradient of the
treatment system were used to calculate the Before and After
Remedies mass discharge, respecitvely, for this pathway.
6 - Total table 3+ (17 compounds) does not include R-PSDA,
Hydrolyzed, PSDA, and R-EVE.
Pathway
Lower Upper Lower Upper
9% 8% 14% 12%
3% 3% 3% 3%
<1% <1% <1% <1%
1% 1% 1% 1%
2% 19% 2% 17%
49% 41% 46% 39%
28% 23% 25% 21%
4% 3% 5% 4%
4% 3% 3% 3%
Q2 2020 (May 2020)
(dry)2
Total Table 3+
(17 Compounds)6
Total Table 3+
(20 Compounds)
TR0795 Page 2 of 4 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 17
CAPE FEAR RIVER TOTAL PFAS RELATIVE
MASS DISCHRAGE PER PATHWAY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
[1] Upstream River Water and Groundwater
[2] Willis Creek
[3] Aerial Deposition on Water Features
[4] Outfall 002
[5] Onsite Groundwater
[6] Seeps
[7] Old Outfall 002
[8] Offsite Adjacent and Downstream Groundwater
[9] Georgia Branch Creek
Notes:
Relative contributions per pathway are presented as a range, which
represents the upper and lower bound estimates.
1 - Model estimated Total PFAS mass discharge for April 2020 is in
Cape Fear River PFAS Mass Loading Assessment - First Quarter
2020 Report (Geosyntec, 2020b).
2 - Model estimated Total PFAS mass discharge for May 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Second Quarter
2020 Report (Geosyntec, 2020c).
3 - Model estimated Total PFAS mass discharge for July 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Third Quarter
2020 Report (Geosyntec, 2020e).
4 - Model estimated Total PFAS mass discharge for December 2020
is presented in this report.
5 - Mass dicharge calculations for Total Attachment C does not
include Perfluorohepthanoic acid (PFHpA).
7 - Mass discharges was estimated before and after remedies have
been implemented at the Transport Pathways. For Q4 2020, the Old
Outfall 002 treatment system became operational, therefore, the
concentrations from the influent and the location downgradient of the
treatment system were used to calculate the Before and After
Remedies mass discharge, respecitvely, for this pathway.
6 - Total table 3+ (17 compounds) does not include R-PSDA,
Hydrolyzed, PSDA, and R-EVE.
Pathway
Lower Upper Lower Upper Lower Upper
1% 1% 1% 1% 1% 1%
5% 4% 5% 4% 5% 4%
<1% <1% <1% <1% <1% <1%
1% 1% 1% <1% 2% 1%
3% 26% 3% 26% 3% 25%
53% 40% 53% 41% 54% 42%
34% 26% 34% 26% 32% 25%
<1% <1% <1% <1% <1% <1%
2% 2% 2% 2% 2% 2%
Q3 2020 (July 2020)
(dry)3
Total Attachment C5 Total Table 3+
(17 Compounds)6
Total Table 3+
(20 Compounds)
TR0795 Page 3 of 4 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
TABLE 17
CAPE FEAR RIVER TOTAL PFAS RELATIVE
MASS DISCHRAGE PER PATHWAY
Chemours Fayetteville Works, North Carolina
Geosyntec Consultants of NC P.C.
[1] Upstream River Water and Groundwater
[2] Willis Creek
[3] Aerial Deposition on Water Features
[4] Outfall 002
[5] Onsite Groundwater
[6] Seeps
[7] Old Outfall 002
[8] Offsite Adjacent and Downstream Groundwater
[9] Georgia Branch Creek
Notes:
Relative contributions per pathway are presented as a range, which
represents the upper and lower bound estimates.
1 - Model estimated Total PFAS mass discharge for April 2020 is in
Cape Fear River PFAS Mass Loading Assessment - First Quarter
2020 Report (Geosyntec, 2020b).
2 - Model estimated Total PFAS mass discharge for May 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Second Quarter
2020 Report (Geosyntec, 2020c).
3 - Model estimated Total PFAS mass discharge for July 2020 is in
Cape Fear River PFAS Mass Loading Assessment - Third Quarter
2020 Report (Geosyntec, 2020e).
4 - Model estimated Total PFAS mass discharge for December 2020
is presented in this report.
5 - Mass dicharge calculations for Total Attachment C does not
include Perfluorohepthanoic acid (PFHpA).
7 - Mass discharges was estimated before and after remedies have
been implemented at the Transport Pathways. For Q4 2020, the Old
Outfall 002 treatment system became operational, therefore, the
concentrations from the influent and the location downgradient of the
treatment system were used to calculate the Before and After
Remedies mass discharge, respecitvely, for this pathway.
6 - Total table 3+ (17 compounds) does not include R-PSDA,
Hydrolyzed, PSDA, and R-EVE.
Pathway
Lower Upper Lower Upper Lower Upper
9% 9% 9% 9% 9% 8%
7% 7% 7% 7% 7% 7%
<1% <1% <1% <1% <1% <1%
2% 2% 3% 3% 4% 4%
14% 18% 13% 18% 13% 16%
43% 41% 43% 41% 43% 41%
17% 16% 17% 16% 16% 16%
4% 3% 3% 3% 3% 3%
5% 5% 5% 4% 5% 5%
Q4 2020 (December 2020) Before Remedies
(wet)4,7
Total Attachment C5 Total Table 3+
(17 Compounds)6
Total Table 3+
(20 Compounds)
TR0795 Page 4 of 4 March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29

TR0795A March 2021
FIGURES

DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
")
")
")
XW
XW
Willis Creek
Old Outfall 002Cape Fear RiverOutfall 002
W.O. Huske Dam
Site River Water Intake
NC Highway 87Seep A
Seep B
Seep C
Seep D
GBCTributary1GeorgiaBranchCreek
Seep C Flow-Through Cell
Old Outfall 002 Treatment System
Site Location Map
Figure
1Raleigh
1,000 0 1,000500 Feet
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_SiteLocation.mxd Last Revised: 2021-03-15 Author: TIpMarch 2021
Notes:1. The outline of Cape Fear River is approximate and is based on open data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS (MajorHydro shapefile).2. Basemap sources: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GISUser Community
Chemours Fayetteville Works, North Carolina
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
Legend
XW Seep C Flow-Through Cell
XW Old Outfall 002 Treatment System
")Site Features
Site Boundary
Nearby Tributary
Observed Seep (Natural Drainage)
Site Conveyance Network
Areas at Site
Chemours Monomers IXM
Former DuPont PMDF Area
Wastewater Treatment Plant
Kuraray SentryGlas®Leased Area
Kuraray Trosifol®Leased Area
DuPont Polyvinyl FluorideLeased Area
Chemours PolymerProcessing Aid Area Power - Filtered andDemineralized WaterProduction
Kuraray Laboratory
8 0 84 Miles
³
Site Location
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
^_
Kings Bluff Intake Canal
ChemoursFayettevilleWorks
Start ofCape FearRiver
Wilmington
Fayetteville
Raleigh
Bladen BluffsIntake
W.O. Huske Dam
Greensboro
Tar HeelFerry RoadBridge
Virginia
NorthCarolina
SouthCarolina
Cape Fear River Watershed and Downstream Drinking Water Intakes
Chemours Fayetteville Works, North Carolina
Figure
2Raleigh
Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_Cape Fear River Watershed and Downstream Intakes.mxd; NBarNahoum; 02/23/2021March 2021
³Deep R
i
verH awRiv
er
LittleRiver
CapeFearRiver
20 0 2010 Miles
Note:Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
Legend
^_Chemours Fayetteville Works
Upper Basin
Middle Basin
Lower Basin
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
RainRain
Cape F
e
ar
Ri
v
e
r
Cape F
e
ar
Ri
v
e
r
Perched Zo
n
e
Surficial Aq
u
i
f
e
r
Black Cre
e
k
Aquifer
Groun
d
w
a
t
e
r
ChemoursFayetteville WorksManufacturing Area
ChemoursFayetteville WorksManufacturing Area
Perched Zone Clay
Black CreekConfining Unit
Perched Zone Clay
Black CreekConfining Unit
Non-contact cooling water from river
Non-Chemours treated process water
Stormwater
(4) Outfall 002 (Pipe to River)
Groundwater
Seep B
Seep A
Seep C
Seep D
(1) Upstream
Cape Fear River
(3) Aerial Deposition
(9) G
e
orgi
a
Branch Creek
(2) Willis Creek
(
7
)
Old Outfall
0
02(6) Seeps
(
5
) OnSite Groundwater (8) Adjacentand Downstream
(3) Aerial Deposition
(9) G
e
orgi
a
Branch Creek
(2) Willis Creek
(
7
)
Old Outfall
0
02(6) Seeps
(
5
) OnSite Groundwater
(
8
)
A
dja
cent and
W.O. Huske DamW.O. Huske Dam Upper Cape Fear Confining Unit(4) Outfall 002 (Pipe to River)
(1) Upstream
Cape Fear River
Down
stre
a
m Groundwater
(
8
)
A
dja
cent and Down
stre
a
m Groundwater
Groundwater
(8) Adjacentand Downstream

Raleigh, NC March 2021
Figure
3
Potential PFAS Transport Pathways to the Cape Fear River from Site
Chemours Fayetteville Works, North Carolina
Note: Image is conceptual and is not to scaleData/PRJ/Projects/TR0795/Database and GIS/Illustrator/3D CSM Illustration/ConceptualSiteModel_Dec2020.aiDocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
#*
#*
#*
#*
#*
#*
#*
#*
#*
#*Ca
p
e
F
e
a
r
R
i
v
e
r
Intake River Water at Facility
CFR-MILE-76
OUTFALL 002
SEEP-C-1
SEEP-D-1
OLDOF-1
SEEP-A-1
SEEP-B-1
LOCK-DAM SEEP
WC-1
W.O. Huske Dam*Old Outfall 002
Willis Creek
1,250 0 1,250625 Feet
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_StreamReaches_FlowMeasurements_Dec2020.mxd Last Revised: 2/25/2021 Author: NBarNahoumProjection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
³Legend
#*Flow Measurement Location
!(Sample Location
Observed Seep
Nearby Tributary
Site Boundary
Notes:* - Flow measurement was taken at W.O. Huske Dam - USGS1. Flow at Seep D was measured using a flume.2. Flow at Old Outfall 002, Willis Creek, Georgia Branch Creek,Seep A, Seep B, and Seep C were measured using flow velocitymethod.3. Results of estimated flow at these locations are provided in Table 9with supplemental flow measurement data included in Appendix D.4. The outline of Cape Fear River is approximate and is based onopen data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS.5. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,and the GIS User Community.
!(#*GBC-1Ge
o
r
g
i
a

B
r
a
n
c
h

C
r
e
e
k
³
1 0 10.5 Miles
³
1
2
1
2
Sample and Flow MeasurementLocations - December 2020
Chemours Fayetteville Works, North Carolina
Figure
4Raleigh
1,000 0 1,000500 Feet
March 2021
2,000 0 2,0001,000 Feet
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!(
!(
!(
CFR-BLADEN
CFR-MILE-76
CFR-TARHEEL
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_CapeFearRiverSampleLocations_Dec2020.mxd Last Revised: 2/25/2021 Author: NBarNahoumProjection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
³
Notes:1. The outline of Cape Fear River is approximate and is based onopen data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS.2. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,and the GIS User Community.
³
25 0 2512.5 Miles
!(
CFR-KINGS
1
³
2 0 21 Miles
2 - Downstream
Cape Fear River SampleLocations - December 2020
Chemours Fayetteville Works, North Carolina
Figure
5Raleigh
2 0 21 Miles
March 2021
Legend
!(Sample Location
Site Boundary
Cape Fear River
1
2
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
CapeFearRi
verSeep D
Old Outfall 002
Seep C
Seep B
Seep A
Willis Creek
Georgi
a

B
r
a
n
c
h

C
r
e
e
k
PIW-1D
PW-04
PW-06
PW-07
SMW-11
LTW-01
LTW-03
LTW-04
PIW-1S
PIW-7S
Bladen-1D
LTW-02
LTW-05
PIW-3D
PIW-7D
PW-09
PW-11
PZ-22
SMW-10
SMW-12
Groundwater Wells for Mass Loading Assessment
Chemours Fayetteville Works, North Carolina
Figure
6Raleigh
1,000 0 1,000500 Feet
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_BaselineGroundwaterMonitoringWellNetwork.mxd; NBarNahoum; 2/23/2021March 2021
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
Notes:1. Due to the scale of the map, pairs of wells that are in close proximity have been offset for visibility. Therefore, the placement of these wells on this map do not reflect their true geographic coordinates.2. The outline of Cape Fear River is approximate and is based on open data from ArcGIS Online and North Carolina Departmentof Environmental Quality Online GIS.3. Basemap source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.
Legend
!'A Surficial Aquifer
!'A Floodplain Deposits
!'A Black Creek Aquifer
!'A Damaged
Observed Seep
Nearby Tributary
Site Boundary
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
@A
@A@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A@A@A@A@A
@A
@A
@A
@A
@A@A
@A
@A@A
@A
@A@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A@A@A@A@A@A
@A
@A@A@A@A@A@A@A@A@A@A
@A
@A@A
@A
@A
@A
@A
@A
@A
@AFTA-01134.14
FTA-02132.88
FTA-03133.68
MW-11125.15
MW-12S132.56MW-1S131.34
MW-23134.33
MW-24128.92
MW-25134.11 MW-26136.5
MW-27132.44
MW-28131.29
MW-2SN M
MW-30135.1
MW-7S137.49 MW-8S141.94 MW-9S133.39
NAF-01140.95
NAF-02141.05
NAF-03140.92
NAF-04N M
NAF-06134.87NAF-07140.6
NAF-08A140.73
NAF-09137.93
NAF-10138.54
NAF-11A136.82
NAF-12140.01
PW-01135.72
PZ-11141.57
PZ-12132
PZ-13138.5
PZ-14136.36
PZ-15135.85PZ-17121.85
PZ-19R137.14
PZ-20R137.07
PZ-21R138.62
PZ-24134.15PZ-25RDRY
PZ-26136.97
PZ-27133.16
PZ-28135.47
PZ-35138.07
PZ-36132.64
PZ-37132.8
PZ-38131.01
PZ-39134.26
PZ-40134.5
PZ-41134.86
PZ-42134.77
PZ-43132.73
PZ-44133.27
PZ-45133.19
SMW-02136.55
SMW-03DRY
SMW-04ADRY
SMW-05125.2
SMW-06DRY
SMW-07128.15
SMW-08DRY
W illis Creek
C
a
p
e
Fe
a
r
Ri
ver
Seep A
Seep B
Seep C
Seep D130130130135140 Groundwater Elevation MapPerched Zone - December 2020
Chem ours Fa yetteville W orks, N orth Ca rolin a
Figure
7ARa leigh
³Pa th: P:\PRJ\Projects\TR0795\Da ta b a se a n d GIS\GIS\Ba selin e Mon itorin g W orkpla n \TR0795_ GW _ Con tours_ Ma ps_ Perched_ Dec2020.m xd La st Revised: 3/3/2021 Author: SSom n a ra in
Ma rch 2021
Projection : N AD 1983 Sta tePla n e N orth Ca rolin a FIPS 3200 Feet; Un its in Foot US
1,000 0 1,000500 Feet
N otes:ft N AV D88 - feet N orth Am erica n V ertica l Da tum 1988.1. Depth to wa ter m ea surem en ts collected on Decem b er 7, 2020.2. Groun d surfa ce eleva tion con tours a re derived from Lida r sca n s perform ed on Decem b er 1, 2019 a n d Decem b er 19, 2019 b y Spectra l Da ta Con sulta n ts, In c. 3. Seep loca tion s iden tified visua lly a s reported in Geosyn tec, 2019. Seeps a n d Creeks In vestiga tion Report. Chem ours Fa yetteville W orks. 26 August 2019.4. The outlin e of Ca pe Fea r River is a pproxim a te a n d is b a sed on open da ta from ArcGIS On lin e a n d N orth Ca rolin a Depa rtm en t of En viron m en ta l Qua lity On lin e GIS (Ma jorHydro sha pefile).5. Ba sem a p source: Esri, Digita lGlob e, GeoEye, Ea rthsta r Geogra phics, CN ES/Airb us DS, USDA, USGS, AeroGRID, IGN , a n d the GIS User Com m un ity.
0.5 0 0.50.25 Miles
³
Legen d
@A Mon itorin g W ell
@A Mon itorin g W ell Used forGroun dwa ter Extra ction
Perched Zon e Boun da ry
Groun dwa ter Con tours(ft N AV D88) - 5 feetin terva lPoten tiom etric Surfa ceIn ferred
Ob served Seep
N ea rb y Trib uta ry
Groun d Surfa ceEleva tion Con tour (ftN AV D88) - 5 ft in terva l
Site Boun da ry
@A
@A @A@A@A@A @A
@A
@A @A
@A@A 135130PZ-29133.18
PZ-34131.88
PZ-33132.66
PZ-32132.92
PZ-31130.16
MW-36132.29
MW-35132.21
MW-34132.13
MW-33132.47
MW-32132.24
MW-31131.82
70 0 7035 Feet
³Pilot Test Area for Plum eStop™
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
@A
@A
@A
@A
@A@A@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A
@A
INSITU-01112.46
INSITU-02DRY
MW-13D104.75MW-14D110.29
MW-15DRR103.21
MW-16D112.89
MW-17D117.74
MW-18D88.79
MW-19D90.03
MW-20D
90.88
MW-21D106.77
MW-22D113.64
NAF-08B95.44
NAF-11B94.13
PIW-10S57.93
PIW-5S61.17
PIW-9S50.81
PW-0289.99
PW-03106.2
PW-0474.81
PW-05123.57
SMW-01124.9
SMW-02B89.2SMW-04B103.26
SMW-05P105.5
SMW-06B103.22
SMW-08B
108.26
SMW-0985.91
SMW-1159.58WillisCreek
C
a
p
e
Fe
a
r
Ri
ver
Seep A
Seep B
Seep C
Seep D
1201105010060807090120
110
50
100
60
80
70
90
Groundwater Elevation MapSurficial Aquifer - December 2020
Chemours Fayetteville Works, North Carolina
Figure
7BRaleigh
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_GW_Contours_Maps_Surficial_Dec2020.mxd Last Revised: 3/3/2021 Author: SSomnarainMarch 2021
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
1,000 0 1,000500 Feet
Notes:NM - Not measuredft NAVD88 - feet North American Vertical Datum 1988.1. Depth to water measurements collected on December 7, 2020.2. Ground surface elevation contours are derived from Lidar scans performed on December 1, 2019 and December 19, 2019 by Spectral Data Consultants, Inc. 3. Seep locations identified visually as reported in Geosyntec, 2019. Seeps and Creeks Investigation Report. Chemours Fayetteville Works. 26 August 2019.4. The outline of Cape Fear River is approximate and is based on open data from ArcGIS Online and North Carolina Department of Environmental Quality Online GIS (MajorHydro shapefile).5. Basemap source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.
0.5 0 0.50.25 Miles
³
Legend
@A Monitoring Well
Groundwater Contours(ft NAVD88) - 10 feetinterval
Inferred GroundwaterFlow Direction
Observed Seep
Nearby Tributary
Ground SurfaceElevation Contour (ftNAVD88) - 5 ft interval
Site Boundary
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A@A
@A@A
@A@A
@A
@A@A
@A@A
@A
@A
@A
@A
@A
@A@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
@A
BCA-0184.43
BCA-0275.07
BCA-03R101.29
BCA-04122.38
EW-160.15
EW-243.35
EW-361.55
EW-450.57
EW-545.38
LTW-0243.2
LTW-0542.78
OW-159.78
OW-1059.82
OW-250.34OW-350.14
OW-461.57OW-561.78
OW-642.8
OW-745.35OW-844.6
OW-961.71
PIW-10DR61.16
PIW-1145.1 PIW-1235.53
PIW-1336.2 PIW-1437.01
PIW-1535.57
PIW-16D130.79
PIW-16S135.11
PIW-1D36.37
PIW-2D59.68
PIW-3D37.56
PIW-4D42.67
PIW-7D43.35
PIW-8D41.55PIW-9D42.49
PW-0948.47
PW-10R47.18
PW-1138.66
PW-1293.77
PW-13117.22
PW-1486.49
PW-15R67.05
PZ-2244.7
SMW-03B93.84
SMW-10
47.37
SMW-1236.01
LTW-0138.88
LTW-0341.24
LTW-0444.19
PIW-1S35.35
PIW-6S40.19
PIW-7S43.42
W illis Creek
C
a
p
e
Fe
a
r
Ri
ver
Seep A
Seep B
Seep C
Seep D
6090
50
70
60
80
40908070 4 04050 Groundwater Elevation MapBlack Creek Aquifer - December 2020
Chemours Fayetteville Works, North Carolina
Figure
7CRaleigh
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_GW_Contours_Maps_BlackCreek_Dec2020.mxd Last Revised: 3/3/2021 Author: SSomnarainMarch 2021
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
1,000 0 1,000500 Feet
Notes:ft NAVD88 - feet North American Vertical Datum 1988.1. Depth to water measurements collected on December 7, 2020.2. Ground surface elevation contours are derived from Lidar scans performed on December 1, 2019 and December 19, 2019 by Spectral Data Consultants, Inc. 3. Seep locations identified visually as reported in Geosyntec, 2019. Seeps andCreeks Investigation Report. Chemours Fayetteville Works. 26 August 2019.4. The outline of Cape Fear River is approximate and is based on open data from ArcGIS Online and North Carolina Department of Environmental Quality Online GIS (MajorHydro shapefile).5. Basemap source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community.
0.5 0 0.50.25 Miles
³
Legend
@A Black Creek
@A Floodplain Deposits
Groundwater Contours(ft NAVD88) - 10 feetinterval
Potentiometric SurfaceInferred
Inferred GroundwaterFlow Direction
Observed Seep
Nearby Tributary
Ground SurfaceElevation Contour (ftNAVD88) - 5 ft interval
Site Boundary
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
Total Table 3+ (17 Compounds) Concentrations, Precipitation
and Daily Flow at Tar Heel Ferry Road Bridge
Chemours Fayetteville Works, North Carolina
Figure
8
Raleigh March 2021
0
1
2
3
4
5
6
7
0
50
100
150
200
250
300
350
400
Total Daily Precipitation (in)Table 3+ (17)Concentration (ng/L)Notes:
-Total Table 3+ concentrations calculated by summing over Attachment C compounds
and Table 3+ (20 compounds) are provided in Table 7.
-Precipitation data are from the USGS monitoring site at the W.O. Huske Dam.
Abbrevations:
in - inches
ng/L - nanograms per liter
ft3/s - cubic feet per seconds
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
0
50
100
150
200
250
300
350
400
Cape Fear River Flow (ft3/s)Table 3+ (17) Concentration (ng/L)
Composite Sample
Grab Sample
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
Total Table 3+ (17 Compounds) Mass Discharge, Precipitation
and Daily Flow at Tar Heel Ferry Road Bridge
Chemours Fayetteville Works, North Carolina
Figure
9
Raleigh March 2021
0
1
2
3
4
5
6
7
0
5
10
15
20
25
30
35
Total Daily Precipitation (in)Total Table 3+ (17)Mass Discharge (mg/s)Notes:
-Total PFAS mass discharges calculated by summing over Table 3+ compounds (20 compounds)
are provided in Table 13.
-Precipitation data are from the USGS monitoring site at the W.O. Huske Dam.
Abbrevations:
in - inches
mg/s - milligram per seconds
ft3/s - cubic feet per seconds
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
0
5
10
15
20
25
30
35
Cape Fear River Flow (ft3/s)Total Table 3+ (17)Mass Discharge (mg/s)Composite Sample
Grab Sample
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(Ca
p
e
F
e
a
r
R
i
v
e
r
Old Outfall 002
Willis Creek
CFR-MILE-7623
LOCK-DAM SEEP
110,000
OLDOF-12,200
OUTFALL 002600
INTAKE AT FACILITY 97
SEEP-A220,000
SEEP-B270,000
SEEP-C420,000
SEEP-D130,000
WC-11,300
1,250 0 1,250625 Feet
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_StreamReaches_Dec_SW_Tot_Tab_3_17Compounds.mxd Last Revised: 2/24/2021 Author: NBarNahoumProjection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
³Legend
!(Sample Location
Site Boundary
Observed Seep
Nearby Tributary
Notes:HFPO-DA - hexafluoropropylene oxide dimer acid1. All results are in nanograms per liter.2. Total table 3+ concentration includes HFPO-DA results evaluated byEPA Method 537 Mod and does not include R-PSDA, HydrolyzedPSDA, and R-EVE.3. Non-detect values were not included in sum of total Table 3+ results.4. Total Table 3+ results include J-qualified data.5. The outline of Cape Fear River is approximate and is based onopen data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS.6. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,and the GIS User Community.
!(GBC-11,500Ge
o
r
g
i
a

B
r
a
n
c
h

C
r
e
e
k
³
1 0 10.5 Miles
1
2
2,000 0 2,0001,000 Feet
³2
1
1,250 0 1,250625 Feet
Total Table 3+ Concentrations (17 Compounds)in Surface Water - December 2020
Chemours Fayetteville Works, North Carolina
Figure
10Raleigh
1,000 0 1,000500 Feet
March 2021
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!(
!(
!(
CFR-BLADEN60
CFR-MILE-76
6.3
CFR-TARHEEL74
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_RiverSamples_Dec_SW_Tot_Tab_3_17Compounds.mxd Last Revised: 3/26/2021 Author: NBarNahoumProjection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
³
Notes:HFPO-DA - hexafluoropropylene oxide dimer acid1. All results are in nanograms per liter.2. Total table 3+ concentration includes HFPO-DA results evaluated byEPA Method 537 Mod and does not include R-PSDA, HydrolyzedPSDA, and R-EVE.3. Non-detect values were not included in sum of total Table 3+ results.4. Total Table 3+ results include J-qualified data.5. The outline of Cape Fear River is approximate and is based onopen data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS.6. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,and the GIS User Community.
³
25 0 2512.5 Miles
!(
CFR-KINGS
79
1
³
2 0 21 Miles
2 - Downstream
Cape Fear River Total Table 3+ Concentrations(17 Compounds) - December 2020
Chemours Fayetteville Works, North Carolina
Figure
11Raleigh
2 0 21 Miles
March 2021
Legend
!(Sample Location
Site Boundary
Cape Fear River
1
2
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!(
!(
!(
CFR-BLADEN7.3
CFR-MILE-76<2.0
CFR-TARHEEL11
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_RiverSamples_Dec_SW_HFPODA.mxd Last Revised: 3/26/2021 Author: NBarNahoumProjection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
³
Notes:HFPO-DA - hexafluoropropylene oxide dimer acid1. All results are in nanograms per liter.2. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,
and the GIS User Community.
³
30 0 3015 Miles
!(
CFR-KINGS
9
1
³
2 0 21 Miles
2 - Downstream
Cape Fear River HFPO-DA Concentrations - December 2020
Chemours Fayetteville Works, North Carolina
Figure
12Raleigh
2 0 21 Miles
March 2021
Legend
!(Sample Location
Site Boundary
Cape Fear River
1
2
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
!'A
WillisC r e e k
CapeFearRi
verSeep A
Seep B
Seep C
Seep D
Old Outfall 002
PW-0426
PW-0622
PW-072,300
SMW-11
84
LTW-01120,000
LTW-03250,000
LTW-04
1,600
PIW-7S
650
LTW-0257,000
LTW-05230,000
PIW-1D
50,000
PIW-7D
1,800
PW-09ND
PZ-22220,000
SMW-1055
SMW-1210,000
Total Table 3+ Concentrations (17 Compounds) in Groundwater - December 2020
Chemours Fayetteville Works, North Carolina
Figure
13Raleigh
³Path: P:\PRJ\Projects\TR0795\Database and GIS\GIS\Baseline Monitoring Workplan\TR0795_GW_MW_Tot_Tab_3_Dec2020_17Compounds.mxd Last Revised: 2/24/2021 Author: NBarNahoumMarch 2021
Projection: NAD 1983 StatePlane North Carolina FIPS 3200 Feet; Units in Foot US
1,500 0 1,500750 Feet
Notes:HFPO-DA - hexafluoropropylene oxide dimer acidNS - not sampled1. All results are in nanograms per liter.2. Total table 3+ concentration includes HFPO-DA results evaluated byEPA Method 537 Mod and does not include R-PSDA, HydrolyzedPSDA, and R-EVE.3. Non-detect values were not included in sum of total Table 3+ results.4. Total Table 3+ results include J-qualified data.5. The outline of Cape Fear River is approximate and is based onopen data from ArcGIS Online and North Carolina Department ofEnvironmental Quality Online GIS.6. Basemap sources: Esri, DigitalGlobe, GeoEye, EarthstarGeographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN,and the GIS User Community.
1 0 10.5 Miles
Legend
!'A Surficial Aquifer
!'A Floodplain Deposits
!'A Black Creek Aquifer
!'A Damaged
Observed Seep
Nearby Tributary
Site Boundary
!'A
G
eorgiaBra
nch
Creek
BLADEN-1DNS
500 0 500250 Feet
2
1
³1
2³
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29
https://projectsitesb.geosyntec.com/5/FWConsentOrder/Shared Documents/34 - P16 Quarterly Reports/01 - Quarterly Reports/2020 Q4/Report/Figures/[Figure 14 - Modelled vs. Measured Mass Load.xlsx]MassLoadData
Figure
14RaleighMarch 2021
Comparison of Modelled and Measured Total Table 3+
(17 Compounds) PFAS Mass Discharge at Tar Heel
Ferry Road Bridge
Chemours Fayetteville Works, North Carolina
0
2
4
6
8
10
12
14
16
18
20
MLM Lower Bound MLM Upper Bound MLM Lower Bound MLM Upper Bound CFR-TARHEELTotal Table 3+ (17 Compounds) Mass Discharge (mg/s)1Upstream River Water and GW
Willis Creek
Aerial Deposition
Outfall 002
Onsite GW
Seeps
Old Outfall 002
Adjacent and Downstream GW
Georgia Branch Creek
Tar Heel
10.6
16.1
11.2
12.7 13.3
Notes:
1 - Mass discharge calculated from Total Table 3+ concentrations excluding results of R-PSDA, Hydrolyzed PSDA, and R-
EVE. Mass discharge calculated from Total Attachment C concentrations and Total Table 3+ (20 compounds) are reported in Table 16.
2 - Before Remedies MLM estimates represent the estimated mass discharge if no remedies were implemented at the
Transport Pathways. For Q4 2020, the Old Outfall 002 treatment system became operational and the concentrations from the influent sample collected in December 2020 were used to calculate the Before Remedy mass discharge for
this pathway.
3 - After Remedies MLM estimates represent the estimated mass discharge after remedies have been implemented at the Transport Pathways. For Q4 2020, the concentrations from the Old Outfall 002 sample collected downgradient
from the treatment system in December 2020 were used to calculate the After Remedy mass discharge for this
pathway.MLM - Mass Loading Model. The lower and upper bounds on the mass discharge was calculated using the minimum
and maximum hydraulic gradients in the Black Creek Aquifer as described in Appendix G.
GW - groundwater
Estimated Before Remedies2 Estimated After Remedies3 Measured in River
DocuSign Envelope ID: 0FEB91A1-6870-4DF2-9FD7-1CF7A3633E29