NC0003573_Addendum_20201223

The Chemours Company
Chemours Fayetteville Works
22828 NC Highway 87 W
Fayetteville,NC 28306
December 15,2020 RECEIVED
DEC 2 3 2020
Julie Grzyb, Supervisor NCDEQ/pWR/NPDES
NCDEQ Division of Water Resources
NPDES Unit
1617 Mail Service Center
Raleigh,North Carolina 27699-1679
j ulie.grzyb(c�ncdenr.gov
Re: Chemours Fayetteville Works NPDES NC003573 Permit Application
Update
Dear Ms. Grzyb:
The Chemours Company FC, LLC is providing an addendum to the National Pollutant
Discharge Elimination System(NPDES)permit application submitted to the North Carolina
Department of Environmental Quality for Fayetteville Works. The application was first
submitted on July 9, 2019. The permit application was resubmitted on November 5, 2019
and an addendum submitted on November 24, 2020. This addendum has been prepared to
incorporate the Monomers/IXM Capture and Treatment System to reduce per- and
polyfluoroalkyl substances (PFAS) loading from stormwater in accordance with the
Addendum to Consent Order Paragraph 12. Pursuant to the Consent Order Addendum, the
system is scheduled to commence operation by June 30, 2021.
In addition to the enclosed NPDES permit application addendum,a listing of the contents of
the application and a general description of the enclosed permit application addendum are
attached. The description identifies the new information associated with the Stormwater
Capture and Treatment System to modify the NPDES permit application.
If you have any questions or need additional information, please contact Christel Compton
at(910)678-1213.
Sincerely,
ktlitlit4/
Brian D. Long
Plant Manager
Chemours—Fayettevill orks

Chemours Fayetteville Works
NPDES Permit Application Update
December 2020

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Chemours Fayetteville Works
NPDES Permit Application Update
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December 2020

CHEMOURS NPDES PERMIT APPLICATION MODIFICATION 12-15-2020
Attachment B - Existing Outfalls
1. Attachment B—Form 2C Outfall 001
As required by the Addendum to the Consent Order Paragraph 12,stormwater from the Monomers/Ion
Exchange Membrane(IXM)area will be captured and treated for storms up to the 1-inch,24-hour design
storm. The area to be treated includes 13.9 acres. The design for the treatment system is conceptual at
this time. The estimated volumes (from a hydrologic model of the area) to be treated are based on an
assumed design flowrate of 150 gallons per minute (gpm). The treated stormwater flow conditions are
detailed in "Attachment B.13 Section 3. Average Flows and Treatment (40 CFR 122.21(k)(3)(i) —
Stormwater Treatment System".
Chemours may begin testing of and discharging from the treatment system, including treatment of
stormwater, prior to June 30, 2021.
Permit application modification
• Section 3.1 Operations Contributing to Flow for Outfall 002—now includes"Attachment B.13"for
the Stormwater Treatment System"
• Section 3.1 Treatment Units for Outfall 002—now includes"Attachment B.13"for the Stormwater
Treatment System
• Section 12.1, Section 11 Additional Information — changes "thru attachment 1" to "thru
attachment K"which is the new Stormwater Treatment System section
2. Attachment B.1 —Line Drawing Water Balance
The Water Balance Line drawing was updated to reflect the stormwater flows from the Monomers/IXM
area which are estimated to be 36,900 gallons per day(gpd)on an annual average basis using a hydrologic
model of the 13.9 acres from January 1, 2006 to December 31, 2018.The Stormwater Treatment System
is required to treat runoff from the 1-inch, 24-hour design storm. The treated volume is expected to
average 28,100 gpd (76%) over a year.
The stormwater flows for the remainder of the site have been estimated using the rational method.The
current acreage for non-process stormwater was reduced from 268.93 acres(November 2020 application)
to 255.03 acres to reflect the 13.9 acres treated by the Stormwater Treatment System. The estimated
non-process stormwater runoff generated from the site (excluding the Monomers/IXM area) is 336,944
gpd.
Permit application modifications
• Updated Attachment B.1 "Form 2C Section 2: Line Drawing Water Balance"to reflect the above
changes in flows.
2

r
CHEMOURS NPDES PERMIT APPLICATION MODIFICATION 12-15-2020
3. Attachment 8.3 Outfall 002 Average Flows and Treatment
Incorporates the Monomers/IXM Stormwater Treatment System flows and stormwater flow that
exceeds the capacity of the treatment system.Also corrects the Outfall 001 estimated long-term
average flow toincorporate the future flows from the Thermal Oxidizer.
4. Attachment 8.13—Average Flows and Treatment for Stormwater Treatment System
"New"
See explanation for Item#1 above.
Attachment K— Monomers/IXM Stormwater Treatment System "New"
Chemours has developed a conceptual design of a stormwater Treatment System to remove per- and
polyfluoroalkyl substances (PFAS) in runoff from the Monomers/IXM area in accordance with the
Addendum to the Consent Order Paragraph 12.The Treatment System will include a prefiltration system
to remove total suspended solids and other constituents, a granulated active carbon (GAC) system, and
other associated equipment. Treated stormwater will be piped into the site conveyance network,
comingle with Non-Contact Cooling Water(NCCW)and flow to Outfall 002. Stormwater that exceeds the
design capacity will bypass the Treatment System and will comingle with NCCW and flow to Outfall 002.
New attachments to the NPDES permit application are noted below.
5. Attachment K.1 Stormwater Treatment System—2 D Form
6. Attachment K.2 Stormwater Treatment System Engineering Report and Data Analysis
7. Attachment K.3 Stormwater Treatment System Potential Location
8. Attachment K.4 Stormwater Treatment System Sampling Plan
3

Attachment B — Form 2C Outfall 001

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
Form U.S.Environmental Protection Agency
2C \-/EPA Application for NPDES Permit to Discharge Wastewater
NPDES EXISTING MANUFACTURING,COMMERCIAL,MINING,AND SILVICULTURE OPERATIONS
SECTION 1.OUTFALL LOCATION(40 CFR 122.21(g)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
o Outfall Receiving Water Name Latitude Longitude
Number
001 Cape Fear River 34° 50' 22.91" N 78° 50' 11.47" W
002 Cape Fear River 34° 50' 18.00" N 78° 49' 43.07" W
O
SECTION 2. LINE DRAWING(40 CFR 122.21(g)(2))
a, 2.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
w . balance?(See instructions for drawing requirements.See Exhibit 2C-1 at end of instructions for example.)
J �
❑✓ Yes ❑ No See attachment B.1
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(g)(3))
3.1 For each outfall identified under Item 1.1, provide average flow and treatment information.Add additional sheets if
necessary.
**Outfall Number 001
Operations Contributing to Flow
Operation Average Flow
SEE ATTACHMENT B.2,B.4,B.5 mgd
£ See Attachment C for Thermal Oxidizer mgd
See Attachment 1 for Reverse Osmosis Process Unit mgd
-a
mgd
c Treatment Units
LL
a, Description Code from Final Disposal of Solid or
co
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
retention time,etc.) by Discharge
SEE ATTACHMENT 8.2,B.S,B.6
Description of Thermal oxidizer WWTP is also in Att.C
Description of Reverse Osmosis Treatment is in Att.1
EPA Form 3510-2C(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
3.1 **Outfall Number**002
cont. Operations Contributing to Flow
Operation Average Flow
SEE ATTACHMENT B.3,B.4,8.5,B.13 mgd
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C 1 Liquid Wastes Other Than
retention time,etc.) by Discharge
-ai SEE ATTACHMENT B.3,B.5,B.6,B.13
Description of Stormwater Treatment System is in Att.K
0
U
m
is
m
F
-a **Outfall Number**
y Operations Contributing to Flow
0 Operation Average Flow
I
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or
(include size,flow rate through each treatment unit, Table 2C-1 Liquid Wastes Other Than
retention time,etc.) by Discharge
3.2 Are you applying for an NPDES permit to operate a privately owned treatment works?
d d 151 Yes ❑ No 4 SKIP to Section 4.
cn 3.3 Have you attached a list that identifies each user of the treatment works?
Q Yes 0 No
EPA Form 3510-2C(Revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
SECTION 4. INTERMITTENT FLOWS(40 CFR 122.21(g)(4))
4.1 Except for storm runoff,leaks,or spills,are any discharges described in Sections 1 and 3 intermittent or seasonal?
❑ Yes ❑✓ No 4 SKIP to Section 5.
4.2 Provide information on intermittent or seasonal flows for each applicable outfall.Attach additional pages,if necessary.
Outfall Operation Frecuency Flow Rate
Number (list) Average Average Long-Term Maximum Duration
Days/Week Months/Year Average Daily
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
days/week months/year mgd mgd days
SECTION 5. PRODUCTION(40 CFR 122.21(g)(5))
5.1 Do any effluent limitation guidelines(ELGs)promulgated by EPA under Section 304 of the CWA apply to your facility?
0 Yes ❑ No-4 SKIP to Section 6.
5.2 Provide the following information on applicable ELGs.
(.7
ELG Category ELG Subcategory Regulatory Citation
OCPSF Direct Discharge Point Sources Subpart D 40 CFR 414 Subpart D
Q
0-
a
5.3 Are anyof the applicable ELGs expressed in terms of production(or other measure of operation)?
PP P
❑ Yes ❑ No 4 SKIP to Section 6.
0
5.4 Provide an actual measure of daily production expressed in terms and units of applicable ELGs.
Outfall Unit of
Number Operation,Product,or Material Quantity per Day Measure
C
O
a.
EPA Form 3510-2C(Revised 3-19) Page 3
9

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
SECTION 6. IMPROVEMENTS(40 CFR 122.21(g)(6))
6.1 Are you presently required by any federal,state,or local authority to meet an implementation schedule for constructing,
upgrading,or operating wastewater treatment equipment or practices or any other environmental programs that could
affect the discharges described in this application?
ID Yes ❑ No 4 SKIP to Item 6.3.
6.2 Briefly identify each applicable project in the table below.
Affected Final Compliance Dates
Brief Identification and Description of Outfalls Source(s)of
L Project (list outfall Discharge Required Projected
number)
E
0
a)
0)
0
6.3 Have you attached sheets describing any additional water pollution control programs(or other environmental projects
that may affect your discharges)that you now have underway or planned?(optional item)
❑� Yes See Attachment I ❑ No ❑ Not applicable
SECTION 7.EFFLUENT AND INTAKE CHARACTERISTICS(40 CFR 122.21(g)(7))
See the instructions to determine the pollutants and parameters you are required to monitor and,in turn,the tables you must
complete. Not all applicants need to complete each table.
Table A.Conventional and Non-Conventional Pollutants
7.1 Are you requesting a waiver from your NPDES permitting authority for one or more of the Table A pollutants for any of
your outfalls?
❑ Yes ❑✓ No 4 SKIP to Item 7.3.
7.2 If yes,indicate the applicable outfalls below.Attach waiver request and other required information to the application.
Outfall Number Outfall Number Outfall Number
7.3 Have you completed monitoring for all Table A pollutants at each of your outfalls for which a waiver has not been
requested and attached the results to this application package?
1.
0 Yes ❑ No;a waiver has been requested from my NPDES
permitting authority for all pollutants at all outfalls.
• Table B.Toxic Metals,Cyanide,Total Phenols,and Organic Toxic Pollutants
. 7.4 Do any of the facility's processes that contribute wastewater fall into one or more of the primary industry categories
listed in Exhibit 2C-3?(See end of instructions for exhibit.)
I4 Yes ❑ No 4 SKIP to Item 7.8.
7.5 Have you checked"Testing Required"for all toxic metals,cyanide,and total phenols in Section 1 of Table B?
LL, © Yes ❑ No
7.6 List the applicable primary industry categories and check the boxes indicating the required GC/MS fraction(s)identified
in Exhibit 2C-3.
Primary Industry Category Required GCIMS Fraction(s)
(Check applicable boxes.)
Organic chemicals manufacturing ❑O Volatile ❑O Acid ElBase/Neutral 0 Pesticide
❑Volatile 0 Acid 0 Base/Neutral 0 Pesticide
❑Volatile 0 Acid 0 Base/Neutral ❑ Pesticide
EPA Form 3510-2C(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
7.7 Have you checked"Testing Required"for all required pollutants in Sections 2 through 5 of Table B for each of the
GC/MS fractions checked in Item 7.6?
4 Yes ❑ No
7.8 Have you checked"Believed Present"or"Believed Absent"for all pollutants listed in Sections 1 through 5 of Table B
where testing is not required?
❑ Yes A No
7.9 Have you provided(1)quantitative data for those Section 1,Table B,pollutants for which you have indicated testing is
required or(2)quantitative data or other required information for those Section 1,Table B,pollutants that you have
indicated are"Believed Present"in your discharge?
0 Yes ❑ No
7.10 Does the applicant qualify for a small business exemption under the criteria specified in the instructions?
❑ Yes 4 Note that you qualify at the top of Table B, ❑ No
then SKIP to Item 7.12.
7.11 Have you provided(1)quantitative data for those Sections 2 through 5,Table B,pollutants for which you have
c determined testing is required or(2)quantitative data or an explanation for those Sections 2 through 5,Table B,
y pollutants you have indicated are"Believed Present"in your discharge?
—' ✓❑ Yes•� 0 No
ci; Table C.Certain Conventional and Non-Conventional Pollutants
12 7.12 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed on Table C
for all outfalls?
;e El Yes 0 No
7.13 Have you completed Table C by providing(1)quantitative data for those pollutants that are limited either directly or
indirectly in an ELG and/or(2)quantitative data or an explanation for those pollutants for which you have indicated
ca "Believed Present"?
N ❑�3 Yes 0 No
Table D.Certain Hazardous Substances and Asbestos
7.14 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed in Table D for
all outfalls?
✓❑ Yes 0 No
7.15 Have you completed Table D by(1)describing the reasons the applicable pollutants are expected to be discharged
and(2)by providing quantitative data,if available?
ElYes ❑ No
Table E.2,3,7,8-Tetrachlorodibenzo-p-Dioxin(2,3,7,8-TCDD)
7.16 Does the facility use or manufacture one or more of the 2,3,7,8-TCDD congeners listed in the instructions,or do you
know or have reason to believe that TCDD is or may be present in the effluent?
❑ Yes 4 Complete Table E. ❑✓ No.4 SKIP to Section 8.
7.17 Have you completed Table E by reporting qualitative data for TCDD?
0 Yes ❑ No
SECTION 8. USED OR MANUFACTURED TOXICS(40 CFR 122.21(g)(9))
8.1 Is any pollutant listed in Table B a substance or a component of a substance used or manufactured at your facility as
an intermediate or final product or byproduct?
4 Yes ❑ No 4 SKIP to Section 9.
3 8.2 List the pollutants below.
g 1. Antimony 4. Methylene chloride 7.
aa,, 2. Benzene 5.Toluene 8.
U)
3. 1,2-dichloroethane 6. 9.
EPA Form 3510-2C(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
SECTION 9. BIOLOGICAL TOXICITY TESTS(40 CFR 122.21(g)(11))
9.1 Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made
within the last three years on(1)any of your discharges or(2)on a receiving water in relation to your discharge?
❑✓ Yes ❑ No 4 SKIP to Section 10.
9.2 Identify the tests and their purposes below.
Test(s) Purpose of Test(s) Submitted to NPDES
'� Date Submitted
Permitting Authority?
0
NC Chronic Effluent Whole Effluent Toxicity Q Yes ❑ No 06/06/2019
a, Bioassay Procedure performed quarterly
0 1
Results of WET testing
submitted with DMRs ❑ Yes ❑ No
❑ Yes ❑ No
SECTION 10.CONTRACT ANALYSES(40 CFR 122.21(g)(12))
10.1 Were any of the analyses reported in Section 7 performed by a contract laboratory or consulting firm?
❑� Yes ❑ No 4 SKIP to Section 11.
10.2 Provide information for each contract laboratory or consulting firm below.
Laboratory Number 1 Laboratory Number 2 Laboratory Number 3
Name of laboratory/firm See Attachment 8.7
cn
�, Laboratory address
R
f6
0 Phone number
Pollutant(s)analyzed
SECTION 11.ADDITIONAL INFORMATION(40 CFR 122.21(g)(13))
11.1 Has the NPDES permitting authority requested additional information?
✓❑ Yes ❑ No-4 SKIP to Section 12.
0
11.2 List the information requested and attach it to this application.
c 1 See attachment F 4.
0
2. 5.
3. 6.
EPA Form 3510-2C(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
SECTION 12.CHECKLIST AND CERTIFICATION STATEMENT (40 CFR 122.22(a)and(d))
12.1 In Column 1 below,mark the sections of Form 2C that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are endosing to alert the permitting authority.Note
that not all applicants are required to complete all sections or provide attachments.
Column 1 Column 2
• Section 1:Outfall Location ❑ w/attachments
❑✓ Section 2:Line Drawing ✓❑ wl line drawing ❑✓ w/additional attachments
Section 3:Average Flows and w/list of each user of
Treatmentrm a w/attachments ❑ privately owned treatment
works
❑ Section 4:Intermittent Flows ❑ wl attachments
❑ Section 5:Production ❑ w/attachments
wl optional additional
0 Section 6:Improvements 0wl attachments sheets describing any
additional pollution control
plans
❑ wl request for a waiver and ❑ wl explanation for identical
supporting information outfalls
E ❑ w/small business exemption other attachments
request El See attachment F
❑ Section 7:Effluent and Intake
`n ❑ w/Table A ❑✓ wl Table B
Characteristics
0
t 0 w/Table C 9 wl Table D
d w/Table E w/analytical results as an
v attachment F
O Section 8:Used or Manufactured ❑ wt attachments
Toxics
0 ❑ Section 9:Biological Toxicity 0 w/attachments
0 Tests
U
❑r Section 10:Contract Analyses ,❑ w/attachments See attachment B 7
✓❑ Section 11:Additional Information ✓❑ w/attachments See attachment C thru attachment K
a Section 12:Checklist and ❑ w/attachments
Certification Statement
12.2 Certification Statement
1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in
accordance with a system designed to assure that qualified personnel properly gather and evaluate the information
submitted.Based on my inquiry of the person or persons who manage the system,or those persons directly
responsible for gathering the information,the information submitted is, to the best of my knowledge and belief,true,
accurate,and complete.I am aware that there are significant penalties for submitting false information,including the
possibility of fine and imprisonment for knowing violations.
Name(print or type first and last name) Official title
BRIAN D.LONG ,!/ ' `%)_ Lo/tic<JJ PLANT MANAGER
Signature l� Date signed
•
144 ( t W i
EPA Form 3510.2C(Revised 3-19) Page 7

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EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(iii))1
Effluent Intake
Waiver (Optional)
Pollutant Requested Units Maximum Maximum Long-Term
(if applicable
) (specify) Daily Monthly Average Daily Number of Long-Term Number of
Discharge Discharge Discharge Analyses Average Value Analyses
(required) (if available) (if available)
❑ Check here if you have applied to your NPDES permitting authority for a waiver for all of the pollutants listed on this table for the noted outfall.
Biochemical oxygen demand Concentration mg/L 40.3 15.1 4.2 229 See Outfall 002
1' ❑
(RODS) Mass lb/day 129.5 49.0 16.9 229
Chemical oxygen demand Concentration mg/L 26.8 1
2. El(COD) Mass b/day 115 1
Concentration mg/L 6.1 1
3. Total organic carbon(TOC) ❑
Mass b/day 26 1
Concentration mg/L 50.5 13.5 6.0 232
4. Total suspended solids(TSS) ❑
Mass lb/day 218.6 56.1 25.9 232
Concentration mg/L 0.54 1
5. Ammonia(as N) ❑
Mass b/day 2.3 1
6. Flow2 0 Rate MGD 1.425 0.688 0.534 537
Temperature(winter) 0 °C °C 23.0 21.2 19.3 78
7.
Temperature(summer) ❑ °C °C 31.0 30.0 29.4 40
pH(minimum) ❑ Standard units S.U. 6.68 n/a n/a 232
8.
pH(maximum) ❑ Standard units S.U. 8.42 n/a n/a 232
I 5ampiing snarl De conauctea according to sutnciently sensitive test proceaures(i.e., metnoas)approvea unaer 4U CA-`-<lib for the analysis of pollutants or poliutant parameters
or required under 40 CFR chapter I,subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
2 The flows in Row 6 are from Dec.2017 to May 2019. Anticipated future flows are based on Kuraray changes manufacturing operations and Chemours proposed new flows
which can be found in Attachment B-2 Outfall Average Flows and Treatment.
EPA Form 3510-2C(Revised 3-19) Page 9

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS, CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Discarge requirede) De ischarge Analyses AverageValue Analyses
( ) (if availab (if available)
❑
Check here if you qualify as a small business per the instructions to Form 2C and,therefore,do not need to submit quantitative data for any of the organic toxic pollutants in Sections
2 through 5 of this table. Note,however,that you must still indicate in the appropriate column of this table if you believe any of the pollutants listed are present in your discharge.
Section 1.Toxic Metals,Cyanide,and Total Phenols
Antimony,total Concentration mg/L <0.00041 1
1.1 (7440 36 0) ❑� ❑
Mass lb/day <0.0018 1
Arsenic,total0 Concentration mg/L <0.00068 1
1.2 El El
(7440-38-2) Mass lb/day <0.0029 1
1.3 Beryllium,total O ❑ ❑ Concentration mg/L <0.000091 1
(7440-41-7) Mass lb/day <0.00039 1
-
1.4 Cadmium,total 0 Concentration mg/L <0.00015 1
El ID
(7440-43-9) Mass lb/day <0.00064 1
1.5 Chromium,total ❑✓ 0 Concentration mg/L <0.01 <0.01 <0.006 2
(7440-47-3) Mass lb/day <0.04 <0.04 <0.026 2
1.6 Copper,total ❑ 0 Concentration mg/L <0.01 <0.01 <0.01 2
(7440-50-8) Mass lb/day <0.042 <0.042 <0.041 2
1.7 Lead,total 0 Concentration mg/L <0.0011 1
(7439-92-1) Mass lb/day <0.0047 1
1.8 Mercury,total El ❑ 0Concentration mg/L <0.000050 1
(7439-97-6) Mass lb/day <0.00021 1
Nickel,total0 Concentration mg/L <0.01 <0.01 <0.007 2
1'9 El 0
(7440-02-0) Mass Ib/day <0.04 <0.04 <0.029 2
Selenium,total0 Concentration mg/L <0.00065 1
1.10 El El
(7782 49 2) Mass lb/day <0.0028 1
1.11 Silver,total 0 Concentration mg/L <0.00017 1
El El
(7440-22-4) Mass Ib/day <0.00073 1
EPA Form 3510-2C(Revised 3-19) Page 11

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))'
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
D(req fireargd a Df available) Discharge Analyses ischarge AValuee Analyses
(if available)
Thallium,total Concentration mg/L <0.00011 1
1.12 (7440 28 0) ❑� 0 0
Mass lb/day <0.00047 1
1.13 Zinc total ❑✓ 0 Concentration mg/L 0.0541 0.0541 0.043 2
(7440-66-6) Mass lb/day 0.231 0.231 0.18 2 _
1.14 Cyanide,total © El
mg/L <0.0050 1
(57-12-5) Mass Ib/day <0.021 1
0 Concentration mg/L <0.010 1
1.15 Phenols,total 0Mass lb/day <0.043 1
Section 2.Organic Toxic Pollutants(GC/MS Fraction-Volatile Compounds)
2.1 Acrolein 0 Concentration ug/L <1.00 1
0 El
(107-02-8) Mass lb/day <0.00428 1
Acrylonitrile 0 Concentration ug/L <0.20 1
2.2 El
(107-13-1) © Mass lb/day <0.00086 1
2.3 Benzene © 0 Concentration ug/L <0.050 1
El
(71-43-2) Mass lb/day <0.00021 1
Bromoform 0 Concentration ug/L <0.10 1
2.4 El 0
(75-25-2) Mass lb/day <0.00043 1
Carbon tetrachloride 0 Concentration ug/L <0.10 1
2.5 El El
(56-23-5) Mass lb/day <0.00043 1
Chlorobenzene Concentration ug/L <0.10 1
2.6 ❑✓ 0
0
(108 90 7) Mass lb/day <0.00043 1
Chlorodibromomethane 0 Concentration ug/L <0.10 1
2.7 El
(124-48-1) © Mass lb/day <0.00043 1
Chloroethane 0 Concentration ug/L <0.10 1
2.8 El El
(75-00-3) Mass lb/day <0.00043 1
EPA Form 3510-2C(Revised 3-19) Page 12

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS, CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long Number
Present Absent Daily Monthly Daily of Term of
D(req fireischargd a Dtavailablle)ischarge
Discharge Analyses AValuee Analyses
(if available)
2.9 2-chloroethylvinyl ether ❑✓ 0 ❑ Concentration ug/L <0.050 1
(110-75-8) Mass lb/day <0.00021 1
Concentration ug/L <0.10 1
2.10 Chloroform(67-66-3) 0 0 0Mass lb/day <O.00043 1
2.11 Dichlorobromomethane Concentration ug/L <0.20 1 1
(75-27-4) Mass lb/day <0.00086 1
212 11-dichloroethane aConcentration ug/L <0.1 1 1
(75-34-3) Mass lb/day <0.0004 1
2.13 1,2-dichloroethane 0 Concentration ug/L <0.20 1 1
(107-06-2) Mass lb/day <0.00086 1
2.14 11-dichloroethylene El El0 Concentration ug/L <0.2 1 1
(75-35-4) Mass lb/day <0.0009 1
2.15 1,2-dichloropropane o 0 Concentration ug/L <0.20 1 1
(78-87-5) Mass lb/day <0.00086 1
2.16 13-dichloropropylene ❑✓ 0 Concentration ug/L <0.080 1 1
(542-75-6) Mass lb/day <0.00034 1
2.17 Ethylbenzene ❑✓ El El
ug/L <0.10 1 1
(100-41-4) Mass _ lb/day <0.00043 1
2.18 Methyl bromide ❑✓ El
ug/L <0.10 1 1
(74-83-9) Mass lb/day <0.00043 1
Methyl chloride Concentration ug/L <0.30 1 1
2.19 (74-87-3) Mass lb/day <0.0013 1
2.20 Methylene chloride Concentration ug/L <0.30 1 1
(75-09-2) Mass lb/day <0.0013 1
1,1,2,2-tetrachloroethane Concentration ug/L <0.050 1 1
2.21 (79-34-5) Mass lb/day <0.00021 1
EPA Form 3510-2C(Revised 3-19) Page 13

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS. CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Discharge Discharge Average
(required) (if available) Discharge Analyses Value Analyses
(if available)
2.22 Tetrachloroethylene El Concentration ug/L <0.20 1
(127-18-4) Mass lb/day <0.00086 1
2.23 Toluene 0 Concentration ug/L <0.050 1
El El
(108-88-3) Mass lb/day <0.00021 1
2 24 1,2-trans-dichloroethylene ElConcentration ug/L <0.10 1
(156-60-5) Mass lb/day <0.00043 1
2.25 1 1,1-trichloroethane ❑✓ 0 Concentration ug/L <0.1 1
(71-55-6) Mass lb/day <0.0004 1
2.26 1,1,2-trichloroethane 0 Concentration ug/L <0.2 1
El El
(79-00-5) Mass lb/day <0.0009 1
2.27 Trichloroethylene El 0 ❑ Concentration ug/L <0.20 1
(79-01-6) Mass lb/day <0.00086 1
2.28 Vinyl chloride 0 Concentration ug/L <0.30 1
(75-01-4) i Mass lb/day <0.0013 1
Section 3.Organic Toxic Pollutants(GC/MS Fraction-Acid Compounds)
3.1 2-chlorophenol ❑✓ 0 Concentration ug/L <0.2 1
(95-57-8) Mass lb/day <0.0009 1
3.2 2,4-dichlorophenol El El Concentration ug/L <0.09 1
(120-83-2) Mass lb/day <0.0004 1
2,4-dimethylphenol Concentration ug/L <0.2 1
3.3 El El
(105-67-9) _Mass lb/day <0.0009 1
4,6-dinitro-o-cresol Concentration ug/L <0.9 1
3.4 El El El
(534-52-1) Mass lb/day <0.004 1
3.5 2,4-dinitrophenol El 0 ❑ Concentration ug/L <0.9 1
(51-28-5) Mass lb/day <0.004 1
EPA Form 3510-2C(Revised 3-19) Page 14

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS.CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Term
of of
Discharge Discharge DisDcharge Analyses Average Analyses
(required) (if available) Value
(if available)
3.6 2-nitrophenol El
0
0 Concentration ug/L <0.3 1
(88-75-5) Mass lb/day <0.001 1
3.7 4-nitrophenol 0 0
0
Concentration ug/L <0.8 1
(100-02-7) Mass lb/day <0.003 1
3.8 p-chloro-m-cresol El 0
0 Concentration ug/L <0.3 1
(59-50-7) Mass lb/day <0.001 1
3.9 Pentachlorophenol 0 0 0 Concentration ug/L <0.7 1
(87-86-5) _ Mass lb/day <0,003 <0.003 1
Phenol Concentration ug/L <0,4 1
3.10 (108-95-2) 0 0 Mass lb/day <0.002 1
2,4,6-trichlorophenol ❑ ❑ ❑ Concentration ug/L <0,2 1
3.11 (88-05-2) Mass lb/day <0.0009 1
Section 4.Organic Toxic Pollutants(GC/MS Fraction—Base/Neutral Compounds)
4.1 Acenaphthene 0
0
0
Concentration ug/L <0.08 1
lb/day(83-32-9) Mass b day <0.0003 1
4.2
Acenaphthylene Concentration ug/L <0.07 1
208-96-8
( ) Mass lb/day <0.0003 1
4.3 Anthracene 0 ❑ ❑ Concentration ug/L <0.07 1
(120-12-7) Mass lb/day <0.0003 1
4.4 Benzidine a 0
0 Concentration ug/L <6 1
(92-87-5) Mass lb/day <0.03 1
4.5 Benzo(a)anthracene El 0
0 Concentration ug/L <0.2 1
(56-55-3) Mass lb/day <0.0009 1
Benzo(a)pyrene 0 ❑ ❑ Concentration ug/L <0.2 1
4.6 (50-32-8) Mass lb/day <0.0009 1
EPA Form 3510-2C(Revised 3-19) Page 15

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Discharge
fired (ifavailabe) Discharge Analyses ischareAValueverage Analyses
(if available)
4.7 3,4-benzofluoranthene Concentration ug/L <0.07 1
(205-99-2) Mass lb/day <0.0003 1
4.8 Benzo(ghi)perylene El Concentration ug/L <0.09 1
(191-24-2) Mass lb/day <0.0004 1
4.9 Benzo(k)fluoranthene El0 Concentration ug/L <0.09 1
(207-08-9) Mass lb/day <0.0004 1
Bis(2-chloroethoxy)methane Concentration ug/L <0.2 1
4.10 El 0 El
(111-91-1) Mass lb/day <0.0009 1
Bis(2-chloroethyl)ether 0 Concentration ug/L <0.09 1
4.11 (111-44-4) ❑✓ El_ Mass lb/day <0.0004 1
4.12 Bis(2-chloroisopropyl)ether 0✓ El Concentration ug/L <0.09 1
(102-80-1) Mass lb/day <0.0004 1
Bis(2-ethylhexyl)phthalate 0 Concentration ug/L 8 1
4.13 El El
(117-81-7) Mass lb/day 0.03 1
4.14 4-bromophenyl phenyl ether El Concentration ug/L <0.2 1
(101-55-3) Mass lb/day <0.0009 1
4.15 Butyl benzyl phthalate ❑✓ Concentration ug/L <0.09 1
(85-68-7) Mass lb/day <0.0004 1
4.16 2-chloronaphthalene El Concentration ug/L <0.6 1
(91-58-7) Mass lb/day <0.003 1
4.17 4-chlorophenyl phenyl ether El El Concentration ug/L <0.8 1
(7005-72-3) Mass lb/day <0.003 1
Chrysene 0 Concentration ug/L <0.2 1
4.18 (218-01-9) ❑� 0
Mass Ib/day <0.0009 1
4.19 Dibenzo(a,h)anthracene ❑ Concentration ug/L <0.09 1
(53-70-3) Mass lb/day <0.0004 1
EPA Form 3510-2C(Revised 3-19) Page 16

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE.TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence Intake
(check one) Effluent
(optional)
Pollutant]Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Discharge(required) Discharge
available) Discharge Analyses AverageValue Analyses
( q ) ( (if available)
1,2-dichlorobenzene Concentration ug/L <0.2 1
4.200
(95-50-1) Mass lb/day <0.0009 1
13-dichlorobenzene 0 Concentration ug/L <0.09 1
4.21 El El
(541-73-1) Mass Ib/day <0.0004 1
4.22 1,4-dichlorobenzene © 0 Concentration ug/L <0.2 1
El
(106-46-7) Mass lb/day <0.0009 1
4.23 3,3-dichlorobenzidine 0 Concentration ug/L <0.09 1
(91-94-1) Mass lb/day <0.0004 1
Diethyl phthalate 0 Concentration ug/L <0.3 1
4.24 El El
(84-66-2)
_ Mass lb/day <0.001 1
Dimethyl phthalate Concentration ug/L <0.5 1
4.25 El El El
(131-11-3) Mass lb/day <0.002 1
Di-n-butyl phthalate 0 Concentration ug/L <0.9 1
4.26 El El
(84-74-2)
Mass lb/day <0.004 1
2,4-dinitrotoluene Concentration ug/L <0.09 1
4.27 (121 14 2) El El
Mass Ib/day <0.0004 1
4.28 2,6-dinitrotoluene 0 Concentration ug/L <0.2 1
El El
(606-20-2) Mass lb/day <0.0009 1
Di-n-octyl phthalate 0 Concentration ug/L <0.5 1
4.29 El El
(117-84-0) _Mass lb/day <0.002 1
4.30 1,2-Diphenylhydrazine © Concentration ug/L <0.09 1
(as azobenzene)(122-66-7) Mass lb/day <0.0004 1
Fluoranthene 0 Concentration ug/L <0.2 1
4.31 El El
(206-44-0) Mass lb/day <0.0009 1
4.32 Fluorene ❑✓ 0 Concentration ug/L <0.08 1
(86-73-7) Mass lb/day <0.0003 1
EPA Form 3510-2C(Revised 3-19) Page 17

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE.TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence Intake
(check one) Effluent (optional)
Pollutant]Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
uD(eq i re
(if available) Discharge Analyses ischarge AValuee Analyses
r (if available)
4.33 Hexachlorobenzene 0 Concentration ug/L <1 <1 <0.8 2
El 0
(118-74-1) Mass lb/day <0.006 <0.006 <0.004 2
4.34 Hexachlorobutadiene 0 Concentration ug/L <0.2 1
El El
(87-68-3) Mass lb/day <0.0009 1
Hexachlorocyclopentadiene 0 Concentration ug/L <0.2 1
4.35 (77-47-4) © Mass lb/day <0.0009 1
4.36 Hexachloroethane a 0 Concentration ug/L <0.09 1
El
(67-72-1) Mass lb/day <0.0004 1
lndeno(1,2,3-cd)pyrene Concentration ug/L <0.07 1
4.37 1:3 El
(193-39-5) Mass lb/day <0.0003 1
Isophorone 0 Concentration ug/L <0.2 1
4.38 El El
(78-59-1) Mass lb/day <0.0009 1
4.39 Naphthalene El El0 Concentration ug/L <0.09 1
(91-20-3) Mass lb/day <0.0004 1
Nitrobenzene Concentration ug/L <0.2 1
4.40 (98 95 3) 0El
Mass lb/day <0.0009 1
4.41 N-nitrosodimethylamine El El Concentration ug/L <0.4 1
(62-75-9) Mass lb/day <0.002 1
N-nitrosodi-n-propylamine 0 Concentration ug/L <0.2 1
4.42 (621-64-7) 0 El
Mass lb/day <0.0009 1
4.43 N-nitrosodiphenylamine El Concentration ug/L <0.09 1
(86-30-6) Mass _ lb/day <0.0004 1
Phenanthrene Concentration ug/L <0.09 1
4.44 (85-01-8) Mass lb/day <0.0004 1
Pyrene Concentration ug/L <0.2 1
4.45 0 El 0
(129 00 0) Mass lb/day <0.0009 1
EPA Form 3510-2C(Revised 3-19) Page 18

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence Intake
(check one) Effluent (optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Present Absent Daily Monthly Daily of Term of
Drequired) ifavailablle) Diarge Discharge scharge Analyses AValuee Analyses
(if available) .
4.46 1,2,4-trichlorobenzene 0✓ 0 Concentration ug/L <0.2 1 1
(120-82-1) Mass lb/day <0.0009 _ 1
Section 5.Organic Toxic Pollutants(GC/MS Fraction-Pesticides)
5.1 Aldrin ❑✓ 0 Concentration ug/L <0.00468 1
(309-00-2) Mass lb/day <0.0000200 1
a-BHC 0 Concentration ug/L <0.0112 1
5.2 (319-84-6) 0 Mass lb/day <0.0000479 1
-BHC 0 Concentration ug/L <0.0431 1
5.3 El a
(319-85-7) Mass lb/day <0.000184 1
y-BHC Concentration ug/L <0.00487 1
5.4 El 0
(58 89 9) Mass lb/day <0.0000208 1
5-BHC 0 Concentration ug/L <0.0103 1
5.5 (319-86-8) Mass lb/day _<0.0000441 1
5.6 Chlordane 0 Concentration ug/L <0.217 1
0 El
(57-74-9) Mass lb/day <0.000928 1
5.7 4 4'-DDT El0 Concentration ug/L <0.00936 1
El
(50-29-3) Mass lb/day <0.0000400 1
5.8 4,4'-DDE O 0 Concentration ug/L <0.0187 1
(72-55-9) Mass lb/day <0,0000800 1
5.9 4,4'-DDD 0 Concentration ug/L <0.00843 1
El 0
(72-54-8) Mass lb/day <0.0000361 1
5.10 Dieldrin 0 0 Concentration ug/L <0.00749 1
(60-57-1) Mass lb/day <0.0000320 1
a-endosulfan 0 Concentration ug/L <0.00281 1
5.11 (115-29-7) Mass lb/day <0.0000120 1
EPA Form 3510-2C(Revised 3-19) Page 19

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS, CYANIDE.TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence Intake
(check one) Effluent (optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long-
Number
Present Absent Daily Monthly Dailischargey of Term of
D(required)
available) Discharge Analyses AValuee Analyses
( q ) (if (if available)
-endosulfan Concentration ug/L <0.00918 1
5.12 El El 0
(115-29-7) Mass lb/day <0.0000393 1
Endosulfan sulfate 0 Concentration ug/L <0.00936 1
5.13 El El
(1031-07-8) Mass lb/day <0.0000400 1
5.14 Endrin Concentration ug/L <0.00843 1
El El El
(72-20-8) Mass lb/day <0.0000361 1
5.15 Endrin aldehyde a Concentration ug/L <0.00852 1
El El
(7421-93-4) Mass Ib/day <0.0000365 1
5.16 Heptachlor Concentration ug/L <0.00749 1
(76-44-8) Mass lb/day <0.0000320 1
Heptachlor epoxide Concentration ug/L <0.00468 1
✓
5.17 (1024-57-3) 0
Mass lb/day <0.0000200 1
PCB-1242 Concentration ug/L <0.0936 1
5.18 (53469-21-9) 0 0 0Mass lb/day <0.000400 1
PCB-1254 Concentration ug/L <0.0936 1
5.19 (11097 69 1) El 0 0Mass lb/day <0.000400 1
PCB-1221 Concentration ug/L <0.0936 1
5.20 (11104 28 2) 0 0 ElMass lb/day <0.000400 1
PCB-1232 Concentration ug/L <0.0936 1
5.21 (11141-16-5) El 0 0Mass lb/day <0.000400 1
PCB-1248 Concentration ug/L <0.0936 1
5.22 (12672-29-6) El 0 0
Mass lb/day <0.000400 1
PCB-1260 Concentration ug/L <0.0936 1
5.23 (11096-82-5) El 0 0Mass lb/day <0.000400 1
PCB-1016 Concentration ug/L <0.0936 1
5.24 (12674-11-2) 0 0 0
Mass lb/day <0.000400 1
EPA Form 3510-2C(Revised 3-19) Page 20

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE B.TOXIC METALS,CYANIDE,TOTAL PHENOLS,AND ORGANIC TOXIC POLLUTANTS(40 CFR 122.21(g)(7)(v))1
Presence or Absence
(check one) Effluent Intake
(optional)
Pollutant/Parameter Testing Units Long-Term
(and CAS Number,if available) Required Believed Believed (specify) Maximum Maximum Average Number Long- Number
Daily Monthly Term
Present Absent Daily of of
Discharge Discharge Discharge Analyses Average Analyses
(required) (if available) Value
(if available)
Toxaphene 0 Concentration ug/L <0.332 1 1
5.25 (8001-35-2) ❑✓ ❑
Mass lb/day <0.00142 1
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C(Revised 3-19) Page 21

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
Units
Pollutant Maximum Long-Term Long-Term
Believed Believed (specify) Maximum Daily Monthly Average Daily Number of Number of
Present Absent Discharge Discharge Discharge Analyses Average Analyses
(required) Value
(if available) (if available]
❑ Check here if you believe all pollutants on Table C to be present in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
❑ Check here if you believe all pollutants on Table C to be absent in your discharge from the noted outfall.You need not complete the"Presence or Absence"column of Table C for
each pollutant.
1. Bromide 0 Concentration mg/L <1.3 1
(24959-67-9) ✓ Mass lb/day <5.6 1
Chlorine,total Concentration mg/L 0.24 1
2' residual 0El Mass lb/day 1.0 1
Concentration CP 5 1
3. Color 0 ❑ Mass n/a
Concentration col/di 14 1
4. Fecal coliform ❑✓ ❑
Mass n/a
5 Fluoride a ❑ Concentration mg/L 1.1 1
(16984-48-8) Mass lb/day 4.7 1
Concentration mg/L 7.0 1
6 Nitrate-nitrite ❑✓ 0
Mass lb/day 30 1
Nitrogen,total Concentration mg/L 0.78 1
7. El
organic(as N) ElMass lb/day 3.34 1
Concentration mg/L <0.5 <0.5 <0.5 19
8. Oil and grease El ❑ Mass lb/day <26.4 <26.4 <20.7 19
Phosphorus(as Concentration mg/L 12.4 1
9' El P),total(7723-14-0) [3Mass lb/day 53.1 1
10. Sulfate(as SO4) ❑ ❑ Concentration mg/L 825 1
(14808-79-8) Mass lb/day 3530 1
Concentration mg/L <0.70 1
11. Sulfide(as S) El ❑
Mass lb/day <3.0 1
EPA Form 3510-2C(Revised 3-19) Page 23

Permit Number i Outfall Number Form Approved 03/05/19
EPA Identification Number NPDESFacility Name pp
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE C. CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence
(check one) Effluent Intake
(Optional)
)
Units Pollutant a u Maximum Long-Term
Believed Believed (specify) Maximum Daily Monthly Average Daily Number of Long-Term Number of
Present Absent Discharge Discharge Discharge Analyses Average Analyses
(required) (if available) Uf available) Value
12. Sulfite(as SO3) ❑ ❑ Concentration mg/L <2 1
(14265-45-3) Mass lb/day <8 1
Concentration mg/L <0.040 1
13. Surfactants 0 0Mass lb/day <0.17 1
14. Aluminum,total ❑ El
Concentration mg/L <0.153 1
(7429-90-5) Mass lb/day <0.655 1
15. Barium,total
❑ ❑ Concentration mg/L 0.0107 1
(7440-39-3) Mass lb/day 0.0458 1
16. Boron,total a 0 Concentration mg/L 0.0239 1
(7440-42-8) Mass lb/day 0.102 1
17 Cobalt,total Concentration mg/L 0.00063 1
El El
(7440-48-4) Mass lb/day 0.0027 1
18. Iron,total ❑✓ 0 Concentration mg/L 0.128 1
(7439-89-6) Mass lb/day 0.548 1
19 Magnesium,total ❑� ❑ Concentration mg/L 3.32 1
(7439-95-4) Mass lb/day 14.2 1
Molybdenum, Concentration mg/L 0.00067 1
20. total ❑✓(7439-98-7) Mass lb/clay 0.0029 1
_
21 Manganese,total 0✓ ❑ Concentration mg/L 0.0415 1
(7439-96-5) Mass lb/day 0.178 1
22 Tin,totalEl ❑ Concentration mg/L <0.00060 1
(7440-31-5) Mass lb/day <0.0026 1
23 Titanium,total 0 ElConcentration mg/L 0.0078 1
(7440-32-6) Mass lb/day 0.034 1
EPA Form 3510-2C(Revised 3-19) Page 24

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE C.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(g)(7)(vi))1
Presence or Absence Intake
(check one) Effluent (Optional)
Units
Pollutant Maximum Long-Term Long-Term
Believed Believed (specify) Maximum Daily
Present Absent Discharge Monthly Average Daily Number of Average Number of
Discharge Discharge Analyses Analyses
(required) Value
(jf available) (if available)
24. Radioactivity Error
Concentration pCi/L <-0.21 1 1
Alpha,total 0 ElMass uCi/day <0.412 1
Concentration pCi/L 5.16 1
Beta,total ❑✓ 0
Mass uCi/day 10.1 1
Concentration pCi/L <0.936 1
Radium,total El ❑ Mass uCi/day <1.84 1
Concentration pCi/L <0.694 1
Radium 226,total El ❑
Mass uCi/day <1.36 1
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C(Revised 3-19) Page 25

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent _
1. Asbestos ❑
2. Acetaldehyde ❑ ✓❑
3. Allyl alcohol ❑ ❑✓
4. Allyl chloride ❑ ❑✓
5. Amyl acetate ❑ ❑✓
6. Aniline ❑ ❑✓
7. Benzonitrile ❑ ❑✓
8. Benzyl chloride ❑ ❑✓
9. Butyl acetate ❑ 0
10. Butylamine ❑ ❑✓
11. Captan 0 ❑✓
12. Carbaryl 0 ❑ May potentially be present in water intake.See attachment F9.3
13. Carbofuran ❑ ❑✓
14. Carbon disulfide ❑ ❑�
15. Chlorpyrifos 0 ❑✓
16. Coumaphos ❑ ❑✓
17. Cresol 0 ❑✓
18. Crotonaldehyde ❑ ❑✓
19. Cyclohexane ❑ ❑✓
EPA Form 3510-2C(Revised 3-19) Page 27

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ✓❑ ❑ May potentially be present in water intake.See attachment F9.3
21. Diazinon ✓❑ 0 May potentially be present in water intake.See attachment F9.3
22. Dicamba ❑ ❑ May potentially be present in water intake.See attachment F9.3
23. Dichlobenil 0 ❑,r
24. Dichlone 0 ❑✓
25. 2,2-dichloropropionic acid 0 ❑✓
26. Dichlorvos ❑ 0
27. Diethyl amine ❑ ❑�
28. Dimethyl amine ❑ ❑✓
29. Dintrobenzene 0 ❑✓
30. Diquat 0 ✓❑
31. Disulfoton ❑ ❑
32. Diuron 0 0 May potentially be present in water intake.See attachment F9.3
33. Epichlorohydrin ❑ ❑�
34. Ethion 0 ❑✓
35. Ethylene diamine ❑ ❑✓
36. Ethylene dibromide 0 ❑✓
37. Formaldehyde ❑./ 0 Used at Site,may potentially be present.See attachment F5&F8
38. Furfural 0 ❑✓
EPA Form 3510-2C(Revised 3-19) Page 28

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE D.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
39. Guthion 0 ❑✓
40. Isoprene 0 0
41. Isopropanolamine ❑ ❑✓
42. Kelthane ❑ 0
43. Kepone 0 ❑�
44. Malathion Q 0 May potentially be present in water intake.See attachment F9.3
45. Mercaptodimethur 0 ❑✓
46. Methoxychlor ❑ El
47. Methyl mercaptan ❑ ✓❑
48. Methyl methacrylate ❑ 0 Used at Site,may potentially be present.See attachment F5
49. Methyl parathion ❑ ✓❑
50. Mevinphos ❑ ✓❑
51. Mexacarbate ❑ ❑✓
52. Monoethyl amine ❑ ❑�
53. Monomethyl amine 0 ❑✓
54. Naled ❑ ❑✓
55. Naphthenic acid ❑ ❑✓
56. Nitrotoluene 0 ❑✓
57. Parathion ❑ ❑✓
EPA Form 3510-2C(Revised 3-19) Page 29

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE D. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
58. Phenolsulfonate ❑ ID
59. Phosgene ❑ ❑✓
60. Propargite ❑ ❑✓
61. Propylene oxide ❑ ❑✓
62. Pyrethrins ❑✓ ❑ Used at Site,may potentially be present.See attachment F8
63. Quinoline ❑ ❑✓
64. Resorcinol ❑ ❑✓
65. Strontium ✓❑ ❑ May potentially be present in water intake.See attachment F9.3
66. Strychnine ❑ ❑✓
67. Styrene ✓❑ ❑ May potentially be present in water intake.See attachment F9.3
68. 2,4,5-T(2,4,5-trichlorophenoxyacetic ❑ ✓❑
acid)
69. TDE(tetrachlorodiphenyl ethane) ❑ ❑✓
70 2,4,5-TP[2-(2,4,5-trichlorophenoxy) ❑ ❑
propanoic acid]
71. Trichlorofon 0 ❑✓
72. Triethanolamine 0 0
73. Triethylamine ✓❑ ❑ Used at Site,may potentially be present.See attachment F5
74. Trimethylamine ❑ ❑✓
75. Uranium ❑ ❑✓
76. Vanadium ❑ 1
EPA Form 3510-2C(Revised 3-19) Page 30

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE D. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 12221(g)(7)(vii))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
77. Vinyl acetate El El
78. Xylene ❑ ❑✓
79. Xylenol ❑ ❑✓
80. Zirconium ✓❑ 0 Used at Site,may potentially be present.See attachment F5
I Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2C(Revised 3-19) Page 31

This page intentionally left blank.

EPA Identification Number NPDES Permit Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works 001 OMB No.2040-0004
TABLE E.2.3.7,8 TETRACHLORODIBENZO P DIOXIN(2,3,7,8 TCDD)(40 CFR 122.21(g)(7)(viii))
TCDD Presence or
Congeners Absence
Pollutant (check one) Results of Screening Procedure
Used or
Manufactured Believed Believed
Present Absent
Outfall sample was analyzed via Method 1613E"Dioxins and Furans(HRGC/HRMS)"with a result of no
2,3,7,8-TCDD �✓ detectable 2,3,7,8-TCDD at an analytical reporting level of 9.5 pg/L.
EPA Form 3510-2C(Revised 3-19) Page 33

Attachment B.1 — Line Drawing Water Balance

Chemours Company-Fayetteville Works NPDES Permit No. NC0003573
FORM 2C SECTION 2: LINE DRAWING ATTACHMENT B.1
WATER BALANCE(Revised 10-15-2020) NPDES PERMIT RENEWAL APPLICATION
Chemours Company-Fayetteville Works
Flow Units: Gallons per Day NPDES Permit No.NC0003573
The overall flow basis was based on site flows from Dec 2017-May 2020. Chemours is proposing additional wastewater to the discharged to the wastewater treatment plant
and KurarayTrosifil®has changed its manufacturing operations from a wet process to a dry process which reduced cooling water river flows and wastewater flow
to the wastewater treatment plant.In addition DuPont plans to increase production with an increase in wastewater flow to the wastewater treatment plant.
In addition some small changes to other flow rates were made
—i Cape Fear River
Frurusgii
{ I
NaOCI
Excess Iiir.
Sediment
ww vn ' Removal Filtered Water
1 FILTERED FWD-Min
WATER SYSTEM a
RIVERW TER 1 1
RoL.IO WATER
gtmoeptere
coororTEa from 15,000I
e Process1 120000 I I 63,259 1
I 241,150 I Demeleralized
I
Water
.r_ SEDIMENT —►I 218,150
4 BASINS
DEMNERALIZED
WATER SYSTEM
•
I 16,306,516 1 6661e amo.F we I I 36,400 1 I 30,000 I
11,000 I 1 Neutralized
•Regenerate 1120 750 I Mnuylere
® • ♦ I
PURCHASED1 CHEMOURS KURARAY AMERICA KURARAY AMERICA
POTABLE HI 30 0001 FLUOROPRODUCT TROSIFOLIRI POLYVINYL SENTRYOLASIRI DUPONT POLYVINYL
POWER BUT'RAL LAMINATE FLUORIDE RESINWATER 130 0001 MANUFACTURING
AREA MANUFACTURING MANUFACTURING PROCESSES
PROCESSES
BOILERS PROCESS PROCESS
MSSII Crl �r�I SANITARY • ; t
FACILITIES AIR T0'e I 0000 I 1(FUNREI +I
�I 17 1 1 11 I
COMPRESSORS (RRUIE)I + t>a,DDg
STORM- cooLw iS
W TER I WATER ____t__
s«...lr� I zo 000 I o o n o I uz oao I °� rs7-oao—I r38 s3§I ITEM I
Prom...* I�T}35}'►� i (FUTURE) 7 ''II
F x2eo I 1 , 1 1 28,0001 i ♦ ..._.yi I
I1 (FUTURE) i
I I I
x •
I I i + I 18,0:4,859
1 373,8u ,s oornm.wr ♦ I i +n«ll.rg.
AI 309 160 I Nonraraa Cooling Water
(FUTURE)
Mr° I revo(M I r• ♦I - OUTFALL
Sum y 0 002 1
;ulemw•p«lrrge Condensate Ev.p«rmn ASLUDOED , CLARFI- —� OUTFALL 3 1
,w crate ITURE) Blo•tlovm �— WWTP CATION 001 ,§ g 1
I
I Oss,r«11 28•00 I I era I r ( 1 Ev.porellon I 2,000 I.—BIOSOLIDS c ¢
• iaord.eeoierae 4—I 800 I.--- DRYINGe
(Mee DYpte)
•
December 2020

Attachment B.3 Outfall 002 Average Flows and Treatment

Chemours Company-Fayetteville Works NPDES Permit No. NC0003573
ATTACHMENT B.3
SECTION 3. AVERAGE FLOWS AND TREATMENT (40 CFR 122.21(g)(3))
OUTFALL NUMBER 002
Operations Contributing to Flovv
Operation Average Flow
River Sediment Basin water overflow 0.045 MGD
Stormwater from Non-Process Areas 0.337 MGD
Monomers/IXM Treated Stormwater 0.028 MGD
Monomers/IXM Stormwater bypassing Treatment System 0.009 MGD
Boiler blowdown and condensate 0.119 MGD
Chemours Fluoroproducts Mfg.Processes non-contact cooling water 0.542 MGD
Chemours Cooling Tower Blowdown 0.007 MGD
Kuraray Trosifol(R)Manufacturing Process non-contact cooling water 0.067 MGD
Kuraray SentryGlas(R)Manufacturing Process non-contact cooling water 0.039 MGD
DuPont Polyvinyl Fluoride Resin Processes non-contact cooling water 0.048 MGD
DuPont Polyvinyl Fluoride Resin Processes RO/CDI reject water 0.044 MGD
Outfall 001 Estimated Effluent Long-term Average Flow * 0.343 MGD
Non-contact River Water Once-through Cooling Water 16.397 MGD
ANTICIPATED OUTFALL 002 LONG-TERM AVERAGE FLOW* 18.025 MGD
*Estimated Flow See Outfall 001 Future and Proposed Operations Contributing to Flow
Treatment Units
Code from Final Disposal
Description(include size,flow rate through each treatment unit, retention of Solid or
time,etc.) Liquid Wastes
Table 2C-2 Other Than by
Discharge
Outfall 002: Final effluent discharge to Cape Fear River. Approx.21 MGD 4 A
average flow
Chemours process wastewater disposed off-site as a non-hazardous solid waste. Off-site disposal
4-1) at non-North
Approx.0.050 MGD. Carolina facility
December 2020

Attachment B.13 — Average Flows and Treatment for
Stormwater Treatment System "New"

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
ATTACHMENT B.13
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(k)(3)(i))
STORMWATER TREATMENT SYSTEM
Operation Maximum Daily
Average Daily Flow
_ Flow
Stormwater treatment system 0.0281 MGD 0.22 MGD
Based on a hydrologic model of the drainage area to the proposed stormwater treatment
system,conceptual design parameters of the Treatment System,and historical hourly
precipitation data from January 1,2006 to December 31,2018,from the Fayetteville Regional
Airport Grannis Field,NC US gauge(93740)(Climate Data Online database from the National
Oceanic and Atmospheric Administration[NOAAJ).
2 Based on the proposed treatment system design flowrate(over 24 hours).
December 2020

Attachment K.1 Stormwater Treatment System — 2 D Form

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
U.S.Environmental Protection Agency
Form Application for NPDES Permit to Discharge Wastewater
2D NPDES *`~,EPA NEW MANUFACTURING,COMMERCIAL,MINING,AND SILVICULTURAL OPERATIONS
THAT HAVE NOT YET COMMENCED DISCHARGE OF PROCESS WASTEWATER
SECTION 1. EXPECTED OUTFALL LOCATION(40 CFR 122.21(k)(1))
1.1 Provide information on each of the facility's outfalls in the table below.
o Outfall Receiving Water Latitude Longitude
Number Name
r
J 104 Cape Fear River* 34° 50' 24.02" N 78° 50' 8.92" W
0
SECTION 2. EXPECTED DISCHARGE DATE(40 CFR 122.21(k)(2))
12)
2.1 Month Day Year
U m
N _c lC
Q m June 30 2021
w
SECTION 3.AVERAGE FLOWS AND TREATMENT(40 CFR 122.21(k)(3)(i))
3.1 For each outfall identified under Item 1.1,provide average flow and treatment information.Add additional sheets as
necessary.
**Outfall Number** 104
Operations Contributing to Flow
Operation Average Flow
See Attachment B.13 mgd
mgd
mgd
mgd
I-
R mgd
U)
(1) Treatment Units
o Description Code from Final Disposal of Solid or Liquid
co (include size,flow rate through each treatment unit, Exhibit 2D-1 Wastes Other Than by Discharge
retention time,etc.)
Prefiltration To be determined To be determined
Granular activated carbon or other similar treatment 2-A To be determined
Postfiltration To be determined To be determined
*See Attachment K.2 for additional detail
*Location in Section 1.1 is approximate.
EPA Form 3510-2D(Revised 3-19) Page 1

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
3.1 **Outfall Number**
Cont. Operations Contributing to Flow
Operation Average Flow
mgd
mgd
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or Liquid
(include size.flow rate through each treatment unit, Exhibit 2D-1 Wastes Other Than by Discharge
retention time,etc.)
a
C
C
0
U
C
a)
E
H
**Outfall Number**
0 Operations Contributing to Flow
Operation Average Flow
mgd
mgd
mgd
mgd
mgd
Treatment Units
Description Code from Final Disposal of Solid or Liquid
(include size,flow rate through each treatment unit, Exhibit 2D-1 Wastes Other Than by Discharge
retention time,etc.)
EPA Form 3510-2D(Revised 3-19) Page 2

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
SECTION 4.LINE DRAWING(40 CFR 122.21(k)(3)(ii))
c 4.1 Have you attached a line drawing to this application that shows the water flow through your facility with a water
c •3 balance?(See instructions for drawing requirements.See Exhibit 2D-2 at end of instructions for example.)
J CO
o ❑ Yes ❑ No See Attachment B.1
SECTION 5.INTERMITTENT OR SEASONAL FLOWS(40 CFR 122.21(k)(3)(iii))
5.1 Except for stormwater runoff,leaks,or spills,are any expected discharges described in Sections 1 and 3 intermittent
or seasonal?
❑ Yes ❑✓ No 4 SKIP to Section 6.
5.2 Provide information on intermittent or seasonal flows for each applicable outfall.Attach additional pages,if
necessary.
Outfall Operations Fre.uency Rate and Volume
Number (list) Average Average Maximum Daily Maximum Total Duration
Days/Week Months/Year Discharge Volume
days/week months/year mgd gallons days
o days/week months/year mgd gallons days
c days/week months/year mgd gallons days
0
co� Outfall Operations Fre uency Rate and Volume
o Number (list) Average Average Maximum Daily Maximum Total Duration
Days/Week Months/Year Discharge Volume
N
p days/week months/year mgd gallons days
E
m
days/week months/year mgd gallons days
days/week months/year mgd gallons days
Outfall Operations Frequency Rate and Volume
Number (list) Average Average Maximum Daily Maximum Total Duration
Days/Week Months/Year Discharge Volume
days/week months/year mgd gallons days
days/week months/year mgd gallons days
days/week months/year mgd gallons days
SECTION 6.PRODUCTION (40 CFR 122.21(k)(4))
6.1 Do any effluent limitation guidelines(ELGs)promulgated by EPA under CWA Section 304 apply to your facility?
0 Yes ❑ No 9 SKIP to Section 7.
c 6.2 Provide the following information on applicable ELGs.
u ELG Category ELG Subcategory Regulatory Citation
c OCPSF Subpart D 40 CFR 414 Subpart D
a
EPA Form 3510-2D(Revised 3-19) Page 3

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
6.3 Are the limitations in the applicable ELGs expressed in terms of production(or other measure of operation)?
❑ Yes 0 No 4 SKIP to Section 7.
6.4 Provide an expected measure of average daily production expressed in terms and units of applicable ELGs.
Expected Actual Average Daily Production for First Three Years
Outfall Year Operation,Product,or Material Quantity per Day Unit of Measure
Number (note basis if applicable)
Year 1
a Year 2
Year 3
0
U
0
Year 1
0
Year 2
Year 3
Year 1
Year 2
Year 3
SECTION 7.EFFLUENT CHARACTERISTICS(40 CFR 122.21(k)(5))
See the instructions to determine the parameters and pollutants you are required to monitor and,in turn,the tables you must
complete. Note that not all applicants need to complete each table.
Table A.Conventional and Non-Conventional Parameters
7.1 Are you requesting a waiver from your NPDES permitting authority for one or more of the Table A parameters for any
of your outfalls?
❑ Yes ✓❑ No 4 SKIP to Item 7.3.
7.2 If yes,indicate the applicable outfalls below.Attach waiver request and other required information to the application.
Outfall number Outfall number Outfall number
7.3 Have you have provided estimates or actual data for all Table A parameters for each of your outfalls for which a
waiver has not been requested and attached the results to this application package?
Effluent data are not yet available but will be No;a waiver has been requested from my
❑yes collected once the treatment system is ❑ NPDES permitting authority for all parameters at
operational.See the Sampling Plan in Att.K.4. all outfalls.
3 Table B.Certain Conventional and Non-Conventional Pollutants
w 7.4 Have you checked"Believed Present"for all pollutants listed in Table B that are limited directly or indirectly by an
applicable ELG?
❑ Yes ❑✓ No
7.5 Have you checked"Believed Present"or`Believed Absent"for all remaining pollutants listed in Table B?
❑ Yes ❑✓ No
7.6 Have you provided estimated data for those Table B pollutants for which you have indicated are"Believed Present"
in your discharge?
❑ Yes ❑✓ No
EPA Form 3510-2D(Revised 3-19) Page 4

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
Table C.Toxic Metals,Total Cyanide,and Total Phenols
7.7 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed on Table C
for all outfalls?
❑ Yes ✓❑ No
7.8 Have you completed Table C by providing estimated data for pollutants you indicated are"Believed Present,"
including the source of the information,for each applicable outfall?
❑ Yes 12 No
Table D.Organic Toxic Pollutants(GCIMS Fractions)
7.9 Do you qualify for a small business exemption under the criteria specified in the Instructions?
❑ Yes 4 Note that you qualify at the top of ❑✓ No
Table D,then SKIP to Item 7.12.
7.10 Have you indicated whether pollutants are`Believed Present"or"Believed Absent"for all pollutants listed on Table D
for all outfalls?
❑ Yes ❑✓ No
0
(-) 7.11 Have you completed Table D by providing estimated data for pollutants you indicated are"Believed Present,"
including the source of the information,for each applicable outfall?
IT; ❑
Yes ❑✓ No
2,3,7,8-Tetrachlorodibenzo-p-Dioxin(TCDD)
7.12 Does the facility use or manufacture one or more of the 2,3,7,8-TCDD congeners listed in the Instructions,or do you
know or have reason to believe that TCDD is or may be present in effluent from any of your outfalls?
' ❑ Yes ❑✓ No
Table E.Certain Hazardous Substances and Asbestos
7.13 Have you indicated whether pollutants are"Believed Present"or"Believed Absent"for all pollutants listed in Table E
for all outfalls?
❑ Yes ❑,/ No
7.14 Have you completed Table E by reporting the reason the pollutants are expected to be present and available
quantitative data for pollutants you indicated are"Believed Present"for each applicable outfall?
❑ Yes ❑✓ No
Intake Credits,Tables A through E
7.15 Are you applying for net credits for the presence of any of the pollutants on Tables A through E for any of your
outfalls?
❑ Yes 4 Consult with your NPDES permitting ❑✓ No
authorit .
SECTION 8.ENGINEERING REPORT(40 CFR 122.21(k)(6))
8.1 Do you have any technical evaluations of your wastewater treatment,including engineering reports or pilot plant
studies?
O-
❑� Yes See Attachment K.2 0 No 4 SKIP to Item 8.3.
8.2 Have you provided the technical evaluation and all related documents to this application package?
0 Yes ❑ No
8.3 Are you aware of any existing plant(s)that resemble production processes,wastewater constituents,or wastewater
treatment at your facility?
❑ Yes © No 4 SKIP to Section 9.
EPA Form 3510-2D(Revised 3-19) Page 5

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03/05/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
8.4 Provide the name and location of the similar plants.
O Name of Similar Plants Location of Similar Plants
cp
re a,
c .c
a, 0
c U
c
W
SECTION 9.OTHER INFORMATION(40 CFR 122.21(k)(7))
9.1 Have you attached any optional information that you would like considered as part of the application review process
(i.e.,material beyond that which you have already noted in the application as being attached)?
© Yes ❑ No 4 SKIP to Section 10.
0 9.2 List the additional items and briefly note why you have included them.
1.
2.
0
3.
4.
5.
SECTION 10.CHECKLIST AND CERTIFICATION STATEMENT(40 CFR 122.22(a)and(d))
10.1 In Column 1 below,mark the sections of Form 2D that you have completed and are submitting with your application.
For each section,specify in Column 2 any attachments that you are enclosing to alert the permitting authority.Note
that not all applicants are required to complete all sections or tables,or provide attachments.
Column 1 Column 2
Section 1:Expected Outfall
✓❑ Location w/attachments(e.g.,responses for additional outfalls)
Section 2: Expected
Discharge Date ❑ w/attachments
Section 3:Average Flows
C)
© and Treatment ❑� w/attachments
❑✓ Section 4:Line Drawing ❑✓ w/line drawing 0 wl additional attachments
❑ Section 5: Intermittent or Elo Seasonal Flows w/attachments
w ❑✓ Section 6:Production ❑ w/attachments
C)
w/Table A waiver
0 request or 0 Table A
approval
N
❑✓ Section 7: Effluent 0 Table B ❑✓ Table C
- Characteristics
ri Table D Table E
"1 attachments
other
attachments
❑✓ Section
Poi 8: Engineering © w/technical evaluations and related attachments
✓❑ Section 9:Other Information © w/optional information
0 Section 10:Checklist and ❑ w/attachments
Certification Statement
EPA Form 3510-2D(Revised 3-19) Page 6

EPA Identification Number NPDES Permit Number Facility Name Form Approved 03A5/19
NCD 047 368 642 NC0003573 Chemours Fayetteville Works OMB No.2040-0004
10.2 cu Certification Statement
cu
E /certify under penalty of law that this document and all attachments were prepared under my direction or supervision
N
in accordance with a system designed to assure that qualified personnel properly gather and evaluate the
0 information submitted.Based on my inquiry of the person or persons who manage the system,or those persons
.� 0 directly responsible for gathering the information, the information submitted is, to the best of my knowledge and
U CD
= belief, true,accurate,and complete.I am aware that there are significant penalties for submitting false information,
'E '� including the possibility of fine and imprisonment for knowing violations.
0 Name(print or type first and last name) Official title
m BRIAN D.LONG /3`)/,_1\J A. /6/j(c Plant Manager
-A
Signature Date signed
cu. g- 40-L�- . �� / fl s� p
o,
EPA Form 3510-2D(Revised 3-19) Page 7

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EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE A.CONVENTIONAL AND NON CONVENTIONAL PARAMETER ESTIMATES(40 CFR 122.21(k)(5)(i))'
Effluent Data Intake Water .
Waiver Units Maximum Daily Average Daily Believed Present?
Pollutant Requested Source of Information
(if applicable) Discharge Discharge (use codes in instructions) (check only one response per
(required) (if available) parameter)
❑ Check here if you have applied to your NPDES authority for a waiver for all of the pollutants listed on this table for the noted outfall.
1 Biochemical oxygen 0
Concentration 0 Yes ❑ No
demand(BOD5) Mass
2 Chemical oxygen demand 0
Concentration El Yes ❑ No
(COD) Mass
3 Total organic carbon 0
Concentration 0 Yes ❑ No
(TOC) Mass
4 Total suspended solids 0
Concentration 0 Yes 0 No
(TSS) Mass
Concentration
5. Ammonia(as N) 0 ❑ Yes 0 No
Mass
6. Flow 0 Rate ❑ Yes 0 No
Temperature(winter) ❑ °C °C
7. ❑ Yes ❑ No
Temperature(summer) 0 °C °C
pH(minimum) ❑ Standard units s.u.
8. El Yes El No
pH(maximum) ❑ Standard units s.u.
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
Outfall 002 will be monitored for these parameters.
EPA Form 3510-2D(Revised 3-19) Page 1

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EPA Identificabon Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE B. CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(k)(5)(ii))1
Presence or Absence Estimated Data for Pollutants Expected to be Present or Limited by an ELG
(check one) (Provide both concentration and mass estimates for each pollutant.)
Effluent Intake Water
Pollutant Believed Believed Maximum Daily Average DailyBelieved Present?
Present Absent Units Discharge Dis har e Source of Information (check onlyone
(required) (if available) (use codes in instructions) response per item)
0 Check(1)here if you believe all pollutants listed to be absent from the discharge.You need not complete Table B for the noted outfall unless you have quantitative data available.
1 Bromide El El El
❑ Yes ❑ No
(24959-67-9) Mass
2 0 0 Chlorine,total Concentration ❑ Yes ❑ No
residual Mass
Concentration
3. Color ❑ ❑ ❑ Yes 0 No
Mass
Concentration
4. Fecal coliform ❑ ❑ 0 Yes ❑ No
Mass
Fluoride Concentration
5. (16984 48 8) El El ElElYes El No
Concentration
6. Nitrate-nitrite ❑ 0 0 Yes ❑ No
Mass
7 Nitrogen,total El ❑ Concentration 0 Yes ❑ No
organic(as N) Mass
Concentration
8. Oil and grease ❑ ❑ ❑ Yes ❑ No
Mass
9 Phosphorus(as P), El 0 Concentration 0 Yes ❑ No
total(7723-14-0) Mass
10. Sulfate(as SO4) Concentration
(14808 79 8) 0 0 Mass 0 Yes El No
Concentration
11. Sulfide(as S) ❑ 0 ❑ Yes ❑ No
Mass
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 3

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE B.CERTAIN CONVENTIONAL AND NON CO VENTIONAL POLLUTANTS(40 CFR 122.21(k)(5)(ii))'
Presence or Absence Estimated Data for Pollutants Expected to be Present or Limited by an ELG
(check one) (Provide both concentration and mass estimates for each pollutant.)
Effluent Intake Water
Pollutant Believed Believed Maximum DailyAverage DailyBelieved Present?
g Source of Information
Present Absent Units Discharge Discharge (use codes in instructions) (check only one
(required) (if available) response per item)
12 Sulfite(as SO3) ❑ Concentration 0 Yes ❑ No
(14265-45-3) Mass
Concentration
13. Surfactants 0 0 0 Yes 0 No
Mass
Aluminum,total Concentration
14. (7429 90 5) 0 0 Mass El 0 No
15. Barium,total 0 0 Concentration ❑ Yes 0 No
(7440-39-3) Mass
Boron,total Concentration
16. (7440 42-8) 0 0 El Yes El No
Mass
17 Cobalt,total ❑ 0 Concentration ❑ Yes 0 No
(7440-48-4) Mass
Iron,total Concentration
18. (7439 89 6) 0 0 Mass 0 Yes ElNo
Magnesium,total 0 Concentration
0 Yes 0 No
19' (7439-95-4) ❑ Mass
20 Molybdenum,total ❑ 0 Concentration 0 Yes ❑ No
(7439-98-7) Mass
21 Manganese,total 0 0 Concentration 0 Yes ❑ No
(7439-96-5) Mass
Tin,total Concentration
0 Yes 0 No
22. (7440-31-5) 0 0 Mass
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 4

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE B.CERTAIN CONVENTIONAL AND NON CONVENTIONAL POLLUTANTS(40 CFR 122.21(k)(5)(ii))'
Presence or Absence Estimated Data for Pollutants Expected to be Present or Limited by an ELG
(check one) (Provide both concentration and mass estimates for each pollutant.)
Effluent Intake Water
Pollutant Believed I Believed Maximum Daily Average Daily Believed Present?
Present Absent Units Discharge Discharge Source of Information (check only one
(use codes in instructions)
(required) (if available) response per item)
23. Titanium,total 0
0
Concentration El Yes ❑ No
(7440-32-6) Mass
24. Radioactivity
Concentration
24.1 Alpha,total 0 0 0 Yes 0 No
Mass
24.2 Beta,total 0 0 Concentration ❑ Yes 0 No
Mass
24.3. Radium,total ❑ ❑ Concentration 0 Yes 0 No
Mass
24.4 Radium 226,total 0 ❑ Concentration 0 Yes ❑ No
Mass
I Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0. See instructions and 40 CFR 122.21(e)(3).
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 5

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EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE C.TOXIC METALS,TOTAL CYANIDE,AND TOTAL PHENOLS(40 CFR 122.21(k)(5)(iii)(A))'
Presence or Absence Estimated Data for Pollutants Expected to be Present in Discharge
(check one) (Provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Maximum Average
Present AbsentDaily Daily Source of Information Believed Present?
Units (Check only one
Discharge Discharge (Use codes in Instructions.) response per pollutant.)
(required) (if available)
❑ Check(✓)here if you believe all pollutants listed to be absent from the discharge.You need not complete Table C for the noted outfall unless you have quantitative data
available.
1. Antimony,Total Concentration
(7440 36 0) El ❑ Mass El Yes 0 No
2. Arsenic,Total Concentration
(7440 38 2) El ❑ Mass 0 Yes El No
3. Beryllium,Total Concentration
(7440 41 7) ❑ ❑ Mass 0 Yes El No
4. Cadmium,Total Concentration
(7440 43 9) El ❑ Mass 0 Yes El No
5. Chromium,Total Concentration
(7440 47 3) El ❑ Mass 0 Yes El No
6. Copper,Total Concentration
(7440 50 8) El ❑ Mass ❑ Yes 0 No
7. Lead,Total Concentration
(7439 92 1) El ❑ Mass 0 Yes 0 No
8. Mercury,Total Concentration
(7439 97 6) ❑ ❑ Mass 0 Yes 0 No
9. Nickel,TotalEl Concentration
(7440 02 0) El Concentration
0 Yes 0 No
10. Selenium,Total Concentration
(7782 49 2) ❑ ❑ Mass 0 Yes 0 No
11. Silver,Total Concentration
(7440 22 4) El ❑ Mass 0 Yes 0 No
12. Thallium,Total ❑ ❑ Concentration
0 Yes 0 No
(7440-28-0) Mass
13. Zinc,Total Concentration
(7440 66 6) El ❑ Mass 0 Yes El No
14. Cyanide,Total Concentration
(57 12 5) El ❑ Mass El Yes 0 No
15. Phenols,Total ❑ 0 Concentration ❑ Yes 0 No
Mass
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See Instructions and 40 CFR 122.21(e)(3).
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 7

This page intentionally left blank.

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
' TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))t
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
❑ Check here if all pollutants listed in Table D are expected to be absent from your facility's discharge.
❑ Check here if the facility believes it is exempt from Table D reporting requirements because it is a qualified small business.See the instructions for exemption criteria and for a list
of materials you must attach to the application.
Note: If you check either of the above boxes,you do not need to complete Table D for the noted outfall unless you have quantitative data available.
1.Organic Toxic Pollutants(GC/MS Fraction—Volatile Compounds)
1.1 Acrolein Concentration
(107-02-8) ❑ 0 Mass 0 Yes 0 No
1.2 Acrylonitrile 0 ❑ ❑ Yes Concentration
(107-13-1) Mass El No
1.3 Benzene Concentration
(71-43-2) 0 0 Mass 0 Yes ElNo
1.4 Bromoform Concentration
(75-25-2) 0 0 Mass 0 Yes ElNo
1.5 Carbon tetrachloride Concentration
(56-23-5) 0 0 Mass 0 Yes ElNo
1.6 Chlorobenzene Concentration
(108-90-7) 0 ❑ Mass ElYes 0 No
1.7 Chlorodibromomethane Concentration
(124-48-1) 0 0 Mass 0 Yes 0 No
1.8 Chloroethane 0 El
Concentration ❑ Yes 0 No
(75-00-3) Mass
1.9 2-chloroethylvinyl ether 0 ❑ Concentration ❑ Yes 0 No
(110 75 8) Mass
1.10 Chloroform(67-66-3) Concentration ❑ No
El ❑ Mass ElYes
1.11 Dichlorobromomethane Concentration
(75-27-4) ❑ 0 Mass 0 Yes 0 No
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 9

EPA Idenbfication Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))'
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
1.12 1,1-dichloroethane Concentration
(75-34-3) 0 0 0 Yes ❑ No
Mass
1.13 1,2-dichloroethane Concentration
(107-06-2) 0 0 0 Yes ❑ No
Mass
1.14 1,1-dichloroethylene Concentration
(75-35-4) ❑ 0 0 Yes 0 No
Mass
1.15 1,2-dichloropropane Concentration
(78-87-5) 0 0 Mass 0 Yes ElNo
1.16 1,3-dichloropropylene Concentration
(542-75-6) 0 ❑ Mass 0 Yes 0 No
1.17 Ethylbenzene Concentration
(100-41-4) 0 ❑ Mass 0 Yes 0 No
1.18 Methyl bromide Concentration
(74-83-9) 0 ❑ Mass 0 Yes 0 No
1.19 Methyl chloride Concentration
(74-87-3) ❑ 0 Mass 0 Yes ElNo
1.20 Methylene chloride ❑ ❑ Concentration ❑ Yes 0 No
(75-09-2) Mass
1.21 1,1,2,2-tetrach loroethane Concentration
(79-34-5) 0 ❑ Mass ElYes 0 No
1.22 Tetrachloroethylene ❑ ❑ Concentration El Yes 0 No
(127-18-4) Mass
1.23 Toluene Concentration
(108-88-3) 0 0 Mass 0 Yes 0 No
1.24 1,2-trans-dichloroethylene Concentration(156-60-5) 0 0 Mass ElYes 0 No
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 10

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GCIMS Fractions)(40 CFR 122.21(k)(5)(iii)(B))1
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
1.25 1,1,1-trichloroethane Concentration
(71-55-6) ❑ ❑ Mass El Yes El No
1.26 1,1,2-trichloroethane ❑ 13
Concentration El Yes El No
(79-00-5) Mass
1.27 Trichloroethylene Concentration El No
(79-01-6) El El ElElYes
1.28 Vinyl chloride Concentration
(75-01-4) ❑ ❑ Mass ElYes 0 No
2.Organic Toxic Pollutants(GCIMS Fraction—Acid Compounds)
2.1 2-chlorophenol Concentration
(95-57-8) ❑ ❑ Mass El Yes El No
2.2 2,4-dichlorophenol Concentration
(120-83-2) ❑ ❑ Mass El Yes El No
2.3 2,4-dimethylphenol Concentration
(105-67-9) ❑ ❑ Mass El Yes El No
2.4 4,6-dinitro-o-cresol Concentration
(534 52 1) El Mass El Yes El No
2.5 2,4-dinitrophenol Concentration
(51-28-5) ❑ ❑ Mass El Yes El No
2.6 2-nitrophenol Concentration
(88-75-5) ❑ ❑ Mass ElYes 0 No
2.7 4-nitrophenol Concentration
(100-02-7) ❑ ❑ Mass ❑ Yes El No
2.8 p-chloro-m-cresol Concentration 0 No
(59-50-7) El El ElElYes
2.9 Pentachlorophenol Concentration
(87-86-5) ❑ ❑ Mass El Yes El No
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 11

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))1
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge _ Discharge (use codes in instructions) pollutant)
2.10 Phenol 0 0 Concentration ❑ Yes 0 No
(108 95 2) Mass
2.11 2,4,6-trichlorophenol ❑ ❑ Concentration ❑ Yes 0 No
(88 05 2) Mass
3.Organic Toxic Pollutants(GCIMS Fraction—Base/Neutral Compounds)
3.1 Acenaphthene Concentration
(83-32-9) ❑ 0 Mass 0 Yes ElNo
3.2 Acenaphthylene ❑ 0 Concentration ❑ Yes 0 No
(208-96-8) Mass
3.3 Anthracene Concentration(120-12-7) 0 0 Mass 0 Yes 0 No
3.4 Benzidine Concentration
(92-87-5) 0 0 Mass 0 Yes ElNo
3.5 Benzo(a)anthracene Concentration
(56-55-3) ❑ 0 Mass 0 Yes ElNo
3.6 Benzo(a)pyrene Concentration
(50-32-8) ❑ 0 Mass 0 Yes 0 No
3.7 3,4-benzofluoranthene 0 ❑ ❑ Yes Concentration
(205-99-2) Mass El No
3.8 Benzo(ghi)perylene Concentration
(191-24-2) ❑ ❑ Mass 0 Yes 0 No
3.9 Benzo(k)fluoranthene Concentration
(207-08-9) ❑ 0 Mass 0 Yes 0 No
3.10 Bis(2-chloroethoxy)methane Concentration
(111-91-1) ❑ ❑ Mass 0 Yes 0 No
3.11 Bis(2-chloroethyl)ether Concentration
(111-44-4) ❑ 0 Mass 0 Yes 0 No
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these parameters. Page 12

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))'
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
3.12 Bis(2-chloroisopropyl)ether Concentration
(102-80-1) ❑ ❑ ❑ Yes ❑ No
Mass
3.13 Bis(2-ethylhexyl)phthalate Concentration
(117-81-7) ❑ ❑ Mass El Yes El No
3.14 4-bromophenyl phenyl ether Concentration
(101-55-3) ❑ ❑ Mass ElYes 0 No
3.15 Butyl benzyl phthalate Concentration
(85-68-7) 0 0 0 Yes ❑ No
Mass
3.16 2-chloronaphthalene Concentration
(91-58-7) 0 0 Mass 0 Yes ElNo
3.17 4-chlorophenyl phenyl ether Concentration
(7005-72-3) 0 ❑ Mass El Yes El No
3.18 Chrysene Concentration
(218-01-9) ❑ 0 Mass El Yes El No
3.19 Dibenzo(a,h)anthracene Concentration
(53-70-3) ❑ ❑ Mass El Yes El No
3.20 1,2-dichlorobenzene Concentration
(95-50-1) ❑ ❑ Mass El Yes El No
3.21 1,3-dichlorobenzene Concentration
(541-73-1) 0 0 Mass El Yes El No
3.22 1,4-dichlorobenzene Concentration
(106-46-7) ❑ 0 Mass El Yes El No
3.23 3,3-dichlorobenzidine Concentration
(91-94-1) 0 ❑ Mass ❑ Yes El No
3.24 Diethyl phthalate Concentration
(84-66-2) ❑ ❑ Mass El Yes El No
3.25 Dimethyl phthalate Concentration
(131-11-3) 0 0 Mass ElYes 0 No
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these parameters. Page 13

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))1
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
3.26 Di-n-butyl phthalate Concentration
(84-74-2) 0 0 Mass 0 Yes ElNo
3.27 2,4-dinitrotoluene 0 El
Concentration El Yes 0 No
(121 14 2) Mass
3.28 2,6-dinitrotoluene ❑ Concentration ❑ Yes 0 No
(606-20-2) Mass
3.29 Di-n-octyl phthalate 0 Concentration ❑ Yes 0 No
(117 84 0) Mass
3.30 1,2-diphenylhydrazine Concentration
(as azobenzene)(122-66-7) ❑ ❑ Mass 0 Yes 0 No
3.31 Fluoranthene 0 ❑ Concentration ❑ Yes 0 No
(206-44-0) Mass
3.32 Fluorene Concentration
(86-73-7) ❑ ❑ Mass ElYes 0 No
3.33 Hexachlorobenzene Concentration
(118-74-1) ❑ 0 Mass ElYes 0 No
3.34 Hexachlorobutadiene 0 ❑ Concentration ❑ Yes 0 No
(87-68-3) Mass
3.35 Hexachlorocyclopentadiene Concentration
(77-47-4) 0 0 Mass 0 Yes ElNo
3.36 Hexachloroethane Concentration El No
(67-72-1) El El ElElYes
3.37. Indeno(1,2,3-cd)pyrene Concentration
(193-39-5) 0 0 Mass 0 Yes ElNo
3.38 Isophorone ❑ Concentration ❑ Yes 0 No
(78 59 1) Mass
3.39 Naphthalene Concentration
(91-20-3) 0 0 Mass 0 Yes ElNo
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 14

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GCIMS Fractions)(40 CFR 122.21(k)(5)(iii)(B))'
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge j Discharge (use codes in instructions) pollutant)
3.40 Nitrobenzene Concentration
(98-95-3) 0 Mass 0 Yes 0 No
3.41 N-nitrosodimethylamine Concentration
(62-75-9) 0 Mass 0 Yes ElNo
3.42 N-nitrosodi-n-propylamine Concentration
(621-64-7) 0 0 Mass El Yes El No
3.43 N-nitrosodiphenylamine Concentration
(86-30-6) 0 0Mass 0 Yes 0 No
3.44 Phenanthrene Concentration
(85-01-8) 0 Yes ❑ No
Mass
3.45 Pyrene Concentration
(129-00-0) 0 ElMass El Yes El No
3.46 1,2,4-trich lorobenzene Concentration
(120-82-1) 0 Mass El Yes El No
4.Organic Toxic Pollutants(GCIMS Fraction—Pesticides)
4.1. Aldrin Concentration
(309-00-2) ❑ Mass ElYes 0 No
4.2 a-BHC Concentration
(319-84-6) 0 ❑ Mass 0 Yes ElNo
4.3 BHC Concentration
(319-85-7) El 0 Mass 0 Yes 0 No
4.4 y-BHC Concentration
(58-89-9) 0 El Mass 0 Yes ElNo
-
4.5 BHC Concentration
(319-86-8) 0 ❑ Mass ElYes 0 No
4.6 Chlordane Concentration
(57-74-9) 0 0 Mass 0 Yes ElNo
EPA Form 3510-2D(Revised 3-19) Outfall 002 will be monitored for these pollutants. Page 15

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GC/MS Fractions)(40 CFR 122.21(k)(5)(iii)(B))'
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
4.7 4,4'-DDT ❑ ❑ Concentration El Yes 0 No
(50 29 3) Mass
4.8 4,4'-DDE ❑ ❑ Concentration El Yes El No
(72 55 9) Mass
4.9 4,4'-DDD ❑ ❑ Concentration El Yes El No
(72 54 8) Mass
4.10 Dieldrin Concentration(60-57-1) El El Mass 0 Yes 0 No
4.11 a-endosulfan Concentration
(115-29-7) ❑ ❑ ❑ Yes ❑ No
Mass
4.12 -endosulfan Concentration
(115-29-7) ❑ ❑ Mass El Yes El No
4.13 Endosulfan sulfate Concentration
(1031-07-8) ❑ ❑ ❑ Yes ❑ No
Mass
4.14 Endrin Concentration
(72 20 8) ❑ 0 Mass El Yes El No
4.15 Endrin aldehyde Concentration
(7421-93-4) ❑ ❑ ❑ Yes ❑ No
Mass
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 16

EPA Identification Number I Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
i
TABLE D.ORGANIC TOXIC POLLUTANTS(Gas Chromatography/Mass Spectrometry or GCIMS Fractions)(40 CFR 122.21(k)(5)(iii)(B))r
Presence or Absence Estimated Data for Pollutants Expected to Be Present in Discharge
(check one) (provide both concentration and mass estimates for each pollutant)
Pollutant Effluent Intake Water
(CAS Number,if available) Believed Believed Units Maximum Average Source of Believed Present?
Present Absent Daily Daily Information (check only one response per
Discharge Discharge (use codes in instructions) pollutant)
4.16 Heptachlor Concentration
(76-44-8) ❑ 0 Mass 0 Yes ElNo
4.17 Heptachlor epoxide Concentration El No
(1024-57-3) 0 0 Mass 0 Yes
4.18 PCB-1242 0 ❑ Concentration El Yes 0 No
(53469-21-9) Mass
4.19 PCB-1254 Concentration
(11097-69-1) ❑ 0 Mass 0 Yes ElNo
4.20 PCB-1221 Concentration
(11104-28-2) 0 0 ❑ Yes 0 No
Mass
4.21 PCB-1232 Concentration
(11141-16-5) 0 ❑ Mass ElYes 0 No
4.22 PCB-1248 0 Concentration El Yes 0 No
(12672-29-6) Mass
4.23 PCB-1260 Concentration ❑ Yes 0 No
(11096-82-5) Mass
4.24 PCB-1016 Concentration
(12674-11-2) ❑ 0 Mass 0 Yes 0 No
4.25 Toxaphene Concentration
(8001-35-2) 0 0 Mass 0 Yes 0 No
i Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 138 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 17

This page intentionally left blank.

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE E. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(k)(5)(v))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present _ Absent
❑ Check(✓)here if you believe all pollutants listed to be absent from the discharge.You need not complete Table E for the noted outfall unless you have quantitative data available.
1. Asbestos ❑ ❑
2. Acetaldehyde ❑ ❑
3. Allyl alcohol ❑ ❑
4. Allyl chloride ❑ ❑
5. Amyl acetate ❑ ❑
6. Aniline 0 ❑
7. Benzonitrile ❑ ❑
8. Benzyl chloride ❑ ❑
9. Butyl acetate ❑ ❑
10. Butylamine ❑ ❑
11. Captan ❑ ❑
12. Carbaryl ❑ ❑
13. Carbofuran ❑ ❑
14. Carbon disulfide ❑ ❑
15. Chlorpyrifos ❑ ❑
16. Coumaphos ❑ ❑
17. Cresol ❑ ❑
18. Crotonaldehyde ❑ ❑
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 19

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCO 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE E. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(k)(5)(v))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent ,
19. Cyclohexane ❑ ❑
20. 2,4-D(2,4-dichlorophenoxyacetic acid) ❑ ❑
21. Diazinon ❑ ❑
22. Dicamba ❑ ❑
23. Dichlobenil ❑ ❑
24. Dichlone ❑ ❑
25. 2,2-dichloropropionic acid ❑ ❑
26. Dichlorvos 0 ❑
27. Diethyl amine ❑ ❑
28. Dimethyl amine ❑ ❑
29. Dintrobenzene ❑ ❑
30. Diquat 0 ❑
31. Disulfoton 0 ❑
32. Diuron 0 ❑
33. Epichlorohydrin ❑ ❑
34. Ethion ❑ ❑
35. Ethylene diamine 0 ❑
36. Ethylene dibromide ❑ ❑
37. Formaldehyde ❑ ❑
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 20

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE E.CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(k)(5)(v))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
38. Furfural ❑ 0
39. Guthion ❑ ❑
40. Isoprene ❑ ❑
41. Isopropanolamine ❑ ❑
42. Kelthane ❑ ❑
43. Kepone ❑ ❑
44. Malathion ❑ ❑
45. Mercaptodimethur ❑ ❑
46. Methoxychlor ❑ ❑
47. Methyl mercaptan ❑ ❑
48. Methyl methacrylate 0 ❑
49. Methyl parathion ❑ ❑
50. Mevinphos ❑ ❑
51. Mexacarbate ❑ ❑
52. Monoethyl amine ❑ ❑
53. Monomethyl amine ❑ ❑
54. Naled ❑ ❑
55. Naphthenic acid 0 ❑
56. Nitrotoluene ❑ ❑
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 21

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE E. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(k)(5)(v))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
57. Parathion ❑ ❑
58. Phenolsulfonate ❑ ❑
59. Phosgene ❑ ❑
60. Propargite 0 ❑
61. Propylene oxide ❑ ❑
62. Pyrethrins ❑ ❑
63. Quinoline ❑ ❑
64. Resorcinol ❑ ❑
65. Strontium ❑ ❑
66. Strychnine ❑ ❑
67. Styrene 0 ❑
68 2,4,5-T(2,4,5-trichlorophenoxyacetic ❑ ❑
acids
69. TDE(tetrachlorodiphenyl ethane) 0 0
70 2,4,5-TP[2-(2,4,5-trichlorophenoxy) ❑ ❑
propanoic acid]
71. Trichlorofon ❑ ❑
72. Triethanolamine 0 ❑
73. Triethylamine ❑ ❑
74. Trimethylamine 0 ❑
75. Uranium ❑ ❑
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 22

EPA Identification Number Facility Name Outfall Number Form Approved 03/05/19
NCD 047 368 642 Chemours Fayetteville Works OMB No.2040-0004
TABLE E. CERTAIN HAZARDOUS SUBSTANCES AND ASBESTOS(40 CFR 122.21(k)(5)(v))1
Presence or Absence
Pollutant (check one) Reason Pollutant Believed Present in Discharge Available Quantitative Data
Believed Believed (specify units)
Present Absent
76. Vanadium ❑ ❑
77. Vinyl acetate ❑ ❑
78. Xylene ❑ ❑
79. Xylenol ❑ ❑
80. Zirconium ❑ ❑
1 Sampling shall be conducted according to sufficiently sensitive test procedures(i.e.,methods)approved under 40 CFR 136 for the analysis of pollutants or pollutant parameters or
required under 40 CFR chapter I,subchapter N or 0.See instructions and 40 CFR 122.21(e)(3).
Outfall 002 will be monitored for these pollutants.
EPA Form 3510-2D(Revised 3-19) Page 23

Attachment K.2 Stormwater Treatment System Engineering
Report and Data Analysis

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
ATTACHMENT K.2
STORMWATER CAPTURE AND TREATMENT SYSTEM
ENGINEERING REPORT AND DATA ANALYSIS
Chemours will treat stormwater runoff from the Chemours Monomers/IXM area(Monomers area)with a
stormwater capture and treatment system(Treatment System)designed to treat for per-and polyfluoroalkyl
(PFAS) compounds. The goal of the Treatment System is to capture and treatment stormwater, up to the
designated design storm, and reliably achieve a removal efficiency of 99%for concentrations of indicator
parameters GenX (HFPO-DA), Perfluoro-2-methoxypropanoic acid (PMPA), and Perfluoro-1-
methoxyacetic acid(PFMOAA). The Treatment System is to commence operation by June 30,2021.
The Addendum to Consent Order Paragraph 12(CO Addendum)specifies(in Paragraph 4)that"By June
30, 2021, Chemours shall complete installation of and commence operation of a system that captures and
treats stormwater from the Monomers/IXM area at the Facility." The CO Addendum also specifies that
"the Monomers/IXM stormwater capture and treatment system consistently captures stormwater from the
Monomers/IXM area in rain events up to one (1) inch within a 24-hour period and removes PFAS
compounds (as measured by concentrations of indicator parameters Genii', PMPA, and PFMOAA) at a
minimum removal efficiency of 99%."
This document provides the conceptual design and engineering assumptions for the Treatment System.
INFLUENT STORMWATER
The Treatment System will treat stormwater runoff from a 13.9 acre drainage area' in the Monomers area.
The Treatment System will receive stormwater runoff from the Monomers area via the Cooling Water
Channel (CWC), and separate stormwater-only ditch, through an offline configuration. Stormwater and
Non-Contact Cooling Water(NCCW)will be separated to create a stormwater-only channel(NCCW will
be in a separate pipe),with a sump and diversion structure located in the southwest corner of the Monomers
area.This is illustrated in Figure 1.
The CO Addendum specifies (in Paragraph 4) that the Treatment System should capture and treat
stormwater from the Monomers area in rain events up to one inch within a 24-hour period. The data
collected to characterize the influent stormwater (see Data Analysis below) were intended to be
representative of the stormwater that will be treated.These samples,however,were not collected as influent
samples to the Treatment System. Further, actual influent concentrations will be highly variable based on
a number of factors including rainfall intensity,duration,and antecedent conditions.
Some rainwater is collected within process water secondary containment in the Monomers area,which is presently
disposed of offsite and therefore does not currently flow through the site conveyance network to Outfall 002.However,
13.9 acres was conservatively assumed as the drainage area to the Treatment System.
1 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
— 1 ? � , " , „* . N.
4.
i � 3 proposed osita
o
, i 1�:5k7tt'
:4 "ill ,�,r J C
n
} 'i :� f t to ater
i
Drainage area to Treatment System
t �s tt,�1 • V�" l�' 1 'mil
.. xt,en �. r i � . roc
- -�F� y~ ^13.9 ac
0 onto t rt' r1Si e , ,}.s 4
-11i '5 1 -yt .
9 k - s t _ -I, '�' �� .. Al 1 1-t_ 77
y Y 1 r l '.��' t x -1 1.3"R. ;� .s t►� ,,,.....
Figure 1.Proposed Treatment System Drainage Area
CONCEPTUAL TREATMENT SYSTEM
The map in Attachment K.3 shows the potential location of the Treatment System and discharge location
where treated effluent is discharged back into the site conveyance network(and ultimately to Outfall 002).
These locations are preliminary and may be re-evaluated during the design process.
Diverted stormwater will be pumped via an offline pump station2 into a storage tank that will function as
flow equalization and initial pretreatment (via sedimentation) for the Treatment System. Following
treatment, treated stormwater will be piped back into the Site Conveyance Network, comingling with
NCCW and flowing to Outfall 002.This concept is illustrated in Figure 2.When the capacity of the sump
and diversion structure is exceeded during storm events with large total rainfall depths and/or intensities,
stormwater flows will flow over the diversion,comingling with NCCW,and flow to Outfall 002.
2 An offline pump station pumps stormwater flows that do not exceed the capacity of the Treatment System.
2 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
Diversion-Storage-Treatment Flow Diagram
storage/
treatment pretreatment pump
train tanks station
s �.?
diversion
4— NCCW l:'
manhole
Untreated Existing I stormwater owsae
diverted to the treatment
stormwater channel(to junction system;high flowsphove
(potentially when design storm)continue
rainfall is in OF 002) I ♦♦♦ stormwater runoffgreater through the channel manhole roan the design storm losing a weir or different
excess ofn elevation outlet pipes)
design storm)
�-- 4n
4—•Treated --
stormwater _ f—
Proposed pipe for NCCW Existing concrete-lined channel
Not to scale (w' `n existing channel) (proposed for stormwater only)
Figure 2.Treatment System Design Schematic
Stormwater Runoff Volume
To determine the necessary storage capacity of the storage tank,the volume of stormwater runoff draining
to the Treatment System was determined, based on guidance from the North Carolina Department of
Environmental Quality(NCDEQ) Stormwater Design Manual (Manual).3 The Simple Method for Runoff
Volume,as outlined in Part B of the Manual,was used to determine the runoff volume from the 1-inch rain
event(as specified in the CO Addendum)from the drainage area.
This method first determines the runoff coefficient using the impervious fraction of the drainage area, as
shown in Equation 1. The impervious fraction was determined using aerial imagery. The drainage area to
the Treatment System was divided into the following classifications: building/rooftop, impervious (i.e.,
pavement), gravel/river rock, and open/undeveloped. Building/rooftop and impervious (i.e., pavement)
areas were assumed to have an imperviousness of 100%,gravel/river rock areas were assumed to be 80%
impervious, and open/undeveloped areas were assumed to be 11% impervious. These assumed values of
imperviousness, based on land cover, were based on guidance from the NCDEQ Stormwater Design
Manual (Part B, Stormwater Calculations, Table 1)4 and best professional judgement. The resulting
impervious fraction of the drainage area to the Treatment System was 0.83,or 83%impervious.
Table 1.Land Cover of Drainage Area to Treatment System
Land Cover Area(acre)
Building/rooftop 2.1
Pavement 2.8
Gravel/river rock 8.2
Open/undeveloped 0.8
Total Area 13.9
3 North Carolina Department of Environmental Quality. North Carolina Department of Environmental Quality
Stormwater Design Manual—Stormwater Calculations.2017.https://deq.nc.gov/sw-bmp-manual
Open/undeveloped areas were assumed to be similar to"Lawns,heavy soils,flat(<2%)",in Table 1 in Part B of the
Manual,which references a rational runoff coefficient of 0.15(and imperviousness of 0.11).
3 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
Equation 1: Runoff Coefficient
Rv = 0.05 + 0.9x /A
where,
Rv is the runoff coefficient(unitless);and
IA is the impervious fraction(unitless).
Rv = 0.05+0.9 x 0.83 = 0.80
Storage Tank Volume
The design volume was then determined using Equation 2 with a design storm depth of one inch. The
drainage area to the Treatment System was determined to be approximately 13.9 acres, as illustrated in
Figure 1.Rainwater in process sumps will continue to be disposed of off-site.The process sumps drainage
area has secondary containment that captures rainwater for disposal off-site(i.e.,it does not drain to the site
conveyance network and then to Outfall 002).Rainwater captured in non-process sumps will be sent to the
Treatment System in accordance with standard operating procedures.To be conservative,the full 13.9 acre
drainage area is assumed for use in subsequent calculations.
Equation 2: Design Volume
DV= 3630 x RD X Rv x A
where,
DV is the design volume(cubic feet);
RD is the design storm depth(inches);
Rv is the runoff coefficient(unitless);and
A is the drainage area(acres).
cu ft
DV = 3630 to x acx1inx0.80x13.9ac
DV = 40,214 cu f t = 300,800 gal
The calculated design volume was used to determine the volume capacity of the storage tank, resulting in
a storage tank that will be designed to have a volume capacity of approximately 300,800 gallons.
Storage Tank Drawdown Time and Design Treatment Flowrate
The maximum treatment flowrate of stormwater that the Treatment System will be capable of treating,was
determined based on the flowrate to drain the storage tank(assuming the tank is full) in the desired tank
4 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
drawdown time. With a desired drawdown time of 36 hours, the discharge rate from the storage tank
(assuming it is full)was calculated to be 139 gallons per minute(gpm)using Equation 3.
Equation 3:Design Flowrate
DV 1 hr
Design Flow = x
T 60 min
where,
Design Flow is the maximum design flowrate for the
Treatment System(gallons per minute[gpm])
DV is the design volume of the storage tank(gallons);and
T is the drawdown time of the storage tank(hours).
300,800 gal 1 hr
Design Flow = x = 139 gpm
36 hr 60 min
The Treatment System is planned to be designed for a(conservative) treatment flowrate of 150 gpm, or
0.22 million gallons per day, on a continuous basis. It should be noted that the storage tank and treatment
system itself function together with the diversion structure(s) and pump station(s) to provide adequate
capture and treatment of stormwater runoff from the drainage area.
HYDROLOGIC MODELING
After completion of the design sizing above, a long-term continuous simulation hydrologic model was
developed with the conceptual Treatment System design inputs to evaluate the overall long-term runoff
volume capture performance of the proposed treatment system with the reality of back-to-back storms.The
amount of runoff volume that can be captured by a diversion weir and pump,storage tank,and flow-through
Treatment System from a series of storms varies considerably based on the high variability in the total
rainfall depths and intensities that are associated with rain events, including the antecedent dry period
between rain events. In order to characterize the volume capture performance with a variety of rain event
durations, depths, intensities, and antecedent dry periods, a long-term simulation of the drainage area
hydrology and Treatment System hydraulics was conducted.
Model Setup and Inputs
The United States Environmental Protection Agency(USEPA)Storm Water Management Model(SWMM)
was used to develop a long-term continuous simulation hydrologic model of the drainage area and proposed
storage tank to evaluate long-term runoff capture.The subsections below outline input data for the model.
Meteorological Data
Historical hourly precipitation data from the Fayetteville Regional Airport Grannis Field, NC US gauge
(93740) were downloaded from the Climate Data Online database from the National Oceanic and
Atmospheric Administration (NOAA). Thirteen years of rainfall data from January 1, 2006 to December
5 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
31,2018 were modeled.' The model used a one-hour time step during dry weather and a one-minute time
step during wet weather. Monthly averages of daily evaporation loss rates were incorporated based on
evapotranspiration values for the Fayetteville area.'
Drainage Area Characteristics
A portion of the drainage area to the Treatment System drains to a stormwater-only ditch,which is located
approximately on the northern and western boundaries of the Monomers/IXM area and flows from east to
west, then north to south. The remaining portion of the drainage area drains to the CWC, which is
approximately located on the eastern and southern boundaries of the Monomers/IXM area and flows from
north to south,then east to west. The hydrologic model includes details of the CWC (portion flowing east
to west),the drainage areas to each channel, and the proposed storage tank. The two drainage areas were
provided by Chemours,and imperviousness was determined using aerial imagery,as described above.
Geospatial files downloaded from the U.S. Department of Agriculture Natural Resources Conservation
Service(NRCS)Web Soil Survey indicate that the soil type in the drainage area to the Treatment System
is Hydrologic Soil Group(HSG)A.Based on this information,the soil suction head was assumed to be 2.9
inches and the initial deficit was assumed to be 0.32.'However,the hydraulic conductivity was assumed to
be 0.05 inches per hour.' This assumption was determined during calibration of the full site hydrologic
model to be more representative of compacted soils, and as a conservative approach. For each drainage
area,the width of the drainage area was calculated using the estimated longest flow path.The slope of each
drainage area was assumed to be 0.4%. Modeling parameters for the two drainage areas to the proposed
Treatment System are shown in Table 2.
Table 2.SWMM Modeling Drainage Area Parameters
Parameter for SWMM Drainage Area to Drainage Area to
Model CWC Stormwater-only Ditch
Area(ac) 7.7 6.2
Width(ft) 502 490
Slope(%) 0.4 0.4
Imperviousness(%) 86 79
Suction Head(in) 2.9 2.9
Conductivity(in/hr) 0.05 0.05
Initial Deficit(fraction) 0.32 0.32
'The average annual rainfall in Fayetteville,NC is approximately 45.3 inches(based on historical rainfall data from
1930 to 2018). The average annual rainfall from 2006 through 2018 was 44.3 inches. Therefore,the modeled time
period was representative of typical rainfall.The modeled period did include several hurricanes.The most significant
(recorded)rainfall was due to Hurricane Matthew(which resulted in 16.2 inches of recorded rainfall in Fayetteville
on October 8,2016).
6 Miller, Grady,et al. "Water Requirements of North Carolina Turfgrasses."NC State Extension Publications,NC
State Extension,2018.
Geosyntec Consultants and Larry Walker Associates.Ventura County Technical Guidance Manual for Stormwater
Quality Control Measures. Prepared for the Ventura Countywide Stormwater Quality Management Program. June
2018.
8 Corresponds to HSG D (Hydrology National Engineering Handbook, Chapter 7,Natural Resources Conservation
Service,U.S.Department of Agriculture,January 2009).
6 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
Long-term Runoff Volume Capture
The long-term hydrologic simulation was executed, based on the aforementioned parameters and
assumptions,and the long-term runoff capture from the drainage area to the Treatment System was
calculated to be 76%. This includes full treatment of runoff from storms less than the design storm and
partial treatment of runoff from storms greater than the design storm.
Capture of 1-inch Storms
As previously described,and as noted in the CO Addendum,the Treatment System was collectively sized
to capture stormwater runoff from the 1-inch, 24-hour design storm. A design storm is a hypothetical
discrete rainstorm (in this case, characterized by a specific rainfall depth of one inch and 24 hours of
duration)that is used in the design of a stormwater control measure. Sizing a stormwater control measure
involves calculating the volume and/or flowrate of runoff resulting from the specified design storm that
will drain to the control measure.Therefore,the Treatment System will be sized to capture and treat runoff
equivalent to the NCDEQ design storm. However,the Treatment System will not necessarily capture and
treat all runoff from storms with depths of one inch in 24 hours due to some storms occurring in close time
proximity to each other or with high intensity. Therefore, an analysis has been performed, using the
aforementioned continuous simulation hydrology model,to evaluate the fraction of 1-inch,24-hour storms
that will be completely versus partially captured.
The capture of individual storm events less than or equal to the design storm(i.e.,storms with precipitation
up to 1-inch in 24 hours) was analyzed over the 13-year simulation period. The analysis defined storm
events (over the 13-year simulation) as calendar days with at least 0.1 inches of rainfall. The analysis
demonstrated that the proposed design resulted in 100% capture of runoff volume from 97% of all
calendar-day storms with up to one inch of precipitation.An analysis was also performed on an hourly
basis where storm events with up to one inch of rainfall and durations of 24 hours or greater were
considered. The analysis defined storm events (over the 13 year simulation) as having 48 hours of dry
weather between storm events (i.e., if there was less than 48 hours of dry weather between wet weather
periods,the wet weather periods were defined as the same storm event).Dry weather was defined as having
less than 0.1 inches of rainfall in a 24 hour period. This analysis demonstrated that the proposed design
captured 100%of runoff volume from 100%of storms(defined on an hourly basis,not calendar days)
with up to one inch of precipitation in at least 24 hours.
Even though the Treatment System is sized based on a discrete design storm, the long-term simulation
shows that a very high percentage, between 97% and 100%, of storms equivalent to or smaller than the
design storm will result in capture and treatment of all of the stormwater runoff from the event. This
demonstrates that the proposed design performs well in capturing storms equivalent to the design storm
over the long-term,even when there is the potential to have short dry weather periods between successive
storm events.
Hydrologic Modeling Summary
The proposed design for the storage tank and Treatment System includes a storage tank with 300,800
gallons of storage capacity and a design flowrate(i.e.,maximum flowrate)for the Treatment System of at
least 139 gpm. It is recommended to specify a treatment system design flowrate of 150 gpm for design of
the Treatment System.
This design is anticipated to provide approximately 76%long-term average annual capture of stormwater
runoff from the drainage area, which includes variable storm events, ranging in precipitation depths,
7 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
durations, and intensities, from the historical 13-year simulation. This proposed design resulted in the
capture of 100%of the runoff volume from approximately 97 to 100%of historical storm events equivalent
to,or smaller,than the design storm of one inch in 24 hours.
As previously mentioned, sizing of the pumps and design of the diversion weir may be further refined
during design of the diversion sump/pump station in the future. As a result, modeling results presented
herein may vary slightly.
TREATMENT SYSTEM
The Treatment System,shown in Figure 3,will contain the following components:
• Prefiltration system to remove total suspended solids(TSS), turbidity, and other constituents that
could potentially have an adverse impact on the PFAS removal by downstream unit operations;
• Granular activated carbon(GAC) system or other similar treatment to remove PFAS compounds.
The GAC system will have vessels in lead/middle/lag configuration and a minimum empty bed
contact time(EBCT)of 10 minutes per vessel;
• Post-filtration to remove GAC fines if needed;
• Settling tanks and solids handling system for the backwash waste from the prefiltration system,
including necessary chemical dosing systems;
• Ancillary equipment(such as pumps and break tanks) as needed for a fully functional Treatment
System.All pumps will be electrically operated;
• Equipment in pre-engineered containerized or trailer-mounted systems.All equipment material of
construction(MOC)shall be compatible with anticipated influent water quality;and
• Instrumentation(level,flow and pressure transmitters),controls(PLC system with HMI),and other
appurtenances necessary for a fully functional system. The Treatment System will be operated
based on a level control with continuous observation during treatment by a qualified operator.
To Landfill
t
Solids Handling System
GAC
Pre•Filtration Adsorption/Similiar
Backwash Technology
Backwash Flow
150 GPM Treated
tso GPM of 150 GPM Filtrated Stormwater to
Stormwater Stoop it,, Pre-Filtration Step for Stormwater Outran 104
r
Collection Tank --- Suspended Solids AdsorptionTechnology
y
/ (i.e.,Clarifier,UF,M =
SimlUarTschnolo{y
Sand Filter)
Figure 3. Conceptual Monomers/IXM Stormwater Treatment System
8 December 2020

Chemours Company—Fayetteville Works NPDES Permit No.NC0003573
Following treatment,treated stormwater will be piped back into the site conveyance network, comingling
with NCCW and flowing to Outfall 002.When the capacity of the sump and diversion structure is exceeded
during storm events with large total rainfall depths and/or intensities, stormwater flows will flow over the
diversion,comingling with NCCW,and flow to Outfall 002.
DATA ANALYSIS
The data analysis presents information on influent stormwater data and treatment performance goals for the
stormwater Treatment System.
The influent data set consists of stormwater-only samples collected from within the Monomers area during
six storm events. Samples were collected between June 2019 and September 2020.All samples were grab
samples. The June 2019 stormwater sampling data were reported in the Assessment of HFPO-DA and
PFMOAA in Outfall 002 Discharge and Evaluations ofPotential Control Options,submitted as Attachment
3 of the Cape Fear River PFAS Loading Reduction Plan(August 2019).The October 2019 and March 2020
stormwater sampling data will be included in the Paragraph 11 quarterly report,to be submitted December
2020.
These samples were collected from numerous stormwater locations within the drainage area to the
Treatment System. The approximate drainage area to each stormwater sampling location was determined,
and calculations were performed(accounting for varying imperviousness of the sampling location drainage
areas) to estimate the approximate flow fraction from each drainage area. The average and maximum
concentrations of analyzed parameters (over all sampled storm events) were used from each individual
stormwater sampling location, with the estimated flow contribution from each drainage area,to calculate
average and maximum flow-weighted concentrations. It is important to note that that these average and
maximum flow-weighted concentrations are intended to be representative of influent stormwater to the
Treatment System. However, the reported data were not collected as influent samples to the Treatment
System.Results of the stormwater sampling and influent water quality analysis are included in Table 3.
Table 3. Summary of PFAS Indicator Compounds in Stormwater Influent
Compound Units Average Maximum Count of
Results
HFPO Dimer Acid ng/L 7,767 15,023 38
PFMOAA ng/L 8,298 13,836 39
PMPA ng/L 1,143 1,857 39
As noted in the CO Addendum,the treatment goal for the Treatment System is to achieve 99%concentration
reduction of PFAS (as measured by concentrations of indicator parameters HFPO-DA, PMPA, and
PFMOAA). The Sampling Plan (Attachment K.4) included the proposed procedures for quantifying the
effectiveness of the Treatment System. The Sampling Plan outlines how the stormwater influent to the
Treatment System (flow and concentration) will be characterized, how the stormwater effluent from the
Treatment System (concentration) will be characterized, and how the Treatment System PFAS removal
efficiency will be assessed(for comparison to the CO Addendum requirement of 99%removal).
References
Geosyntec,2019.Cape Fear River PFAS Loading Reduction Plan. September 27, 2019.
9 December 2020

Attachment K.3 Stormwater Treatment System Potential
Location

Attachment K.3: Stormwater Treatment System Potential Location N
a
sri.� d
4
Open Channel
to Outtalk 002
i"eve ,..,),~0,-,-,-- , A,
.
, .0. . "'' . ._- , 4 --* ,
4
s
tF
talk_ .
Legend t . '4A ,�
f ■ ■ ■ ■ � � ' `_ , m
Potential Location of Stormwater Treatment System 04- m +k
ti ■ ■ ■ ■ n.
Potential Effluent from Stormwater Treatment System ` "'' h _ ;,,;. ,
Site Boundary ,
Site Conveyance Network
Ditch Types 0g -
11111111111111111'Wood Lined Trench =., higy '
Wastewater Treatment Plant Discharge 1
Cooling Water Channel
Open Channel to Outfall 002
��DuPont Area 180 90 0 180 Feet
*Location of stormwater treatment system is approximate and subject to change. r I

Attachment K.4 Stormwater Treatment System Sampling Plan

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Geosyntec °
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Geosyntec Consultants of NC,P.C.
NC License No.:C-3500 and C-295
STORMWATER TREATMENT
SYSTEM SAMPLING PLAN
Chemours Fayetteville Works
Prepared for
The Chemours Company FC, LLC
22828 NC Highway 87
Fayetteville,NC 28306
Prepared by ,os.N1C ArR pj%,,,��
Geosyntec Consultants of NC, P.C. Q� \9
2501 Blue Ridge Road, Suite 430 = SEAL
Raleigh,NC 27607 = 038141
''�FNNE D. 16;C‘``
Project Number TR0795
��rnn
�—DocuSlgned by:
September 2020
`—15D8CDF15426487
9/30/2020

DocuSign Envelope ID:CEO9CE50-91DD-4BFB-82E0-B876714C45BC
Geosyntec l>
(ni�ultant�
TABLE OF CONTENTS
1 INTRODUCTION 1
2 TREATMENT SYSTEM DESCRIPTION 1
3 SCOPE OF WORK 2
3.1 Sampling Schedule 2
3.2 Sample Types and Locations 3
3.3 Flow Measurement Scope 3
3.4 Associated Data Recording Scope 3
4 METHODS 3
4.1 Sample Collection 3
4.2 Equipment Decontamination 4
4.3 Flow Measurement Methods 4
4.4 Field QA/QC Samples 4
4.5 Sample Packing and Shipping 5
5 CALCULATIONS 6
6 REPORTING 7
7 POTENTIAL ADJUSTMENTS 8
8 REFERENCES 9
SW Sampling Plan_20200930 ii September 2020

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NC license No.:C 3500 and C-295
LIST OF TABLES
Table 1: Sampling and Analysis
LIST OF FIGURES
Figure 1: Proposed Stormwater Treatment System Location
SW Sampling Plan 20200930 iii September 2020

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LIST OF ABBREVIATIONS
CO Consent Order
EQ equalization
GAC granular activated carbon
gpm gallons per minute
HFPO-DA hexafluoropropylene oxide dimer acid
IX ion exchange
ng/L nanograms per liter
NCCW non-contact cooling water
NCDEQ North Carolina Department of Environmental Quality
NPDES National Pollutant Discharge Elimination System
O&M operation and maintenance
PFAS per- and polyfluoroalkyl substances
PFMOAA 2,2-difluoro-2-(trifluoromethoxy)acetic acid
PMPA perfluoromethoxypropyl carboxylic acid
QAPP Quality Assurance Project Plan
QA/QC quality assurance/quality control
SOP standard operating procedure
TSS total suspended solids
USGS United States Geological Survey
SW Sampling Plan_20200930 v September 2020

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NC License No.:C 3500 and C 295
1 INTRODUCTION
Geosyntec Consultants of NC, PC (Geosyntec)has prepared this Stormwater Treatment
System Sampling Plan("Sampling Plan")on behalf of The Chemours Company FC,LLC
(Chemours)pursuant to the requirements of Paragraph 4(b)of the Addendum to Consent
Order Paragraph 12 (CO Addendum). This paragraph requires that Chemours submit a
stormwater sampling plan to quantify the effectiveness of the stormwater capture and
treatment system (Treatment System), as measured by concentrations of indicator
parameters hexafluoropropylene oxide dimer acid(HFPO-DA),perfluoromethoxypropyl
carboxylic acid (PMPA), and 2,2-difluoro-2-(trifluoromethoxy) acetic acid (PFMOAA).
The CO Addendum specifies that Chemours shall install and operate a system that
captures and treats stormwater from the area (by June 30, 2021, as noted in Paragraph
4[a]). Implementation of this Sampling Plan is intended to achieve the following
objectives:
• Characterize the stormwater influent to the Treatment System (flow and
concentration);
• Characterize the stormwater effluent from the Treatment System(concentration);
and
• Assess the Treatment System PFAS removal efficiency for comparison to the CO
Addendum requirement of 99%removal.
2 TREATMENT SYSTEM DESCRIPTION
The Treatment System will treat stormwater runoff from 11.8 acres within the area shown
on Attachment 6 of the CO Addendum for per- and polyfluoroalkyl substances (PFAS)
and is planned to be installed adjacent to the cooling water channel. As of September
2020,the Treatment System design and vendor selection are ongoing.
Stormwater will be captured,collected,and transferred to an equalization(EQ)Tank.The
diversion system, pump, EQ Tank, and Treatment System will be collectively sized to
capture stormwater runoff from the North Carolina Department of Environmental Quality
(NCDEQ) 1-inch,24-hour design storm(as reflected in NCDEQ stormwater permits and
as implemented in NCDEQ's statewide Stormwater Design Manual) from the drainage
area shown in Figure 1.
A design storm is a hypothetical discrete rainstorm (in this case, characterized by a
specific rainfall depth of 1 inch and 24 hours of duration)that is used in the design of a
stormwater control measure. Sizing a stormwater control measure involves calculating
the volume of runoff resulting from the specified design storm, that will drain to the
control measure.Therefore,the Treatment System will be sized to capture and treat runoff
SW Sampling Plan_20200930 1 September 2020

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equivalent to the design storm volume.The Treatment System will not necessarily capture
and treat all runoff from larger storms or a series of storm events that occur in close
proximity to each other, including successive 1 inch in 24-hour storm events.
The Treatment System will treat the collected stormwater in the EQ Tank,up to the design
flowrate, to achieve the effluent targets for the indicator parameters HFPO-DA, PMPA,
and PFMOAA. The Treatment System will use granular activated carbon (GAC) to
remove PFAS but may include features for other treatment also. For storm events larger
than the design storm, stormwater flows that bypass the in-line diversion structure to the
Treatment System will combine (untreated) stormwater with non-contact cooling water
(NCCW) in the cooling water channel that flows to Outfall 002.
The Treatment System will also potentially include the following: (i) prefiltration to
remove total suspended solids (TSS), turbidity, and other constituents that clog and
potentially reduce PFAS removal by downstream unit operations; (ii) settling tanks and
solids handling system for the backwash waste from the prefiltration system (including
chemical dosing skids); and(iii)a post-filtration system to remove GAC fines.
3 SCOPE OF WORK
This Sampling Plan addresses the need to characterize stormwater influent to and effluent
from the Treatment System and assess its effectiveness in removing indicator PFAS.This
scope of work involves collecting influent and effluent samples from the Treatment
System during rain events when the Treatment System is treating stormwater. The
sampling scope and schedule presented herein may be modified based on changes in Site
conditions, adjustments in understanding of Site conditions, or potential sampling
requirements in future permits such as a National Pollutant Discharge Elimination System
(NPDES)permit.
3.1 Sampling Schedule
Sampling will be performed during wet weather, when the Treatment System is
discharging treated stormwater from the drainage area. For the first two months after the
Treatment System begins operating, sampling will be conducted up to four times per
month. Following the first two months of operation, sampling will be conducted up to
twice per month. The ability to collect samples will depend on the occurrence of rainfall
events of sufficient volume to enable sampling. Sampling events in a given month are
intended to occur at least three days apart.
SW Sampling Plan_20200930 2 September 2020

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3.2 Sample Types and Locations
Time-weighted composite samples will be collected from the influent and the effluent to
the Treatment System and each will be analyzed for HFPO-DA, PMPA, and PFMOAA.
This is summarized in Table 1.
3.3 Flow Measurement Scope
Continuous flow measurements at appropriate time intervals (e.g., 5 or 15 minute) will
be taken from the influent (discharge from the EQ Tank) and water levels will be
measured in the EQ Tank during every sampling event. This is summarized in Table 1.
Flow measurements will also be taken to measure any stormwater flow that bypasses the
Treatment System.
3.4 Associated Data Recording Scope
The following types of data will be recorded during Treatment System operation:
• Precipitation during a given evaluation period will be monitored by using either
the existing United States Geological Survey(USGS)weather monitoring station
at the W.O. Huske Dam(gage 02105500)or the onsite meteorological station;
• Total stormwater volume treated by the stormwater Treatment System;
• Total stormwater volume bypassing the system;
• Capacity of EQ Tank throughout the evaluation period; and
• Other recorded field data or observations.
4 METHODS
This section describes the field methods and specific procedures for collecting samples
and field measurements.
4.1 Sample Collection
Influent and effluent samples will be collected as time-weighted composite samples using
autosamplers. Samples will be collected from subsamples collected every two hours.
Collection will continue for a total of three subsamples or the duration of a storm,
whichever occurs first. For all samples,care will be taken to avoid collecting settled/bed
sediment or other materials which may be potentially present in the sample. Other
relevant sampling procedure information can be found in the Poly and Perfluoroalkyl
Substance Quality Assurance Project Plan(AECOM, 2018).
SW Sampling Plan_20200930 3 September 2020

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NC license No,:C 3500 and C.295
4.2 Equipment Decontamination
All non-dedicated or non-disposable sampling equipment will be decontaminated
immediately before sample collection in the following manner:
• De-ionized water rinse;
• Scrub with de-ionized water containing non-phosphate detergent (i.e.,
Alconox®);
• De-ionized water rinse; and
• Disposable equipment(e.g. gloves,tubing,etc.)will not be reused.
4.3 Flow Measurement Methods
The Treatment System will include instrumentation to collect flow and water level
measurements. The flow meter will be installed at the Treatment System influent
(discharge from the EQ Tank) and will represent both influent and effluent flows for the
Treatment System.Additionally,flow measurements will be collected of any stormwater
flow that bypasses the Treatment System. This flow will potentially be measured at the
overflow weir from the diversion sump/lift station.Alternatively, flow may be measured
both in the channel just downstream of the diversion sump/lift station and in the pipe
conveying NCCW,just upstream of discharge into the channel, where the difference in
these two flows represents stormwater flow bypassing the Treatment System, or some
other method that can measure this flow.
Water level will also be measured within the EQ Tank. Both readings will be recorded
during every sampling event.
4.4 Field QA/QC Samples
Quality assurance/quality control (QA/QC) samples will be collected at an overall
frequency of at minimum twenty percent (20%) for the program. QA/QC samples may
not be collected during each sampling event.The following types of QA/QC samples will
be collected:
• Equipment Blanks: At the sample location, laboratory-supplied, analyte-free
water will be poured over or through the clean, non-dedicated sampling
equipment, and collected in a sample container. The equipment blank samples
will then be shipped, stored, and handled with the other samples and will be
analyzed for the same parameters as other samples collected using the same
device.
SW Sampling Plan 20200930 4 September 2020

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NC License\o.:C 3500 and C.295
• Field Blanks: The field blank will be collected by transferring laboratory-
supplied, analyte-free water into a sample container in the vicinity of a sample
location without contacting any other sampling equipment.
• Field Duplicates: The duplicate will be collected in the same manner as the other
samples and the duplicate sample will be analyzed for the same parameters as the
co-located samples. Duplicates will be numbered sequentially with the other
samples, so they are not identifiable by the analytical laboratory (i.e., "blind"
duplicates).
• Matrix Spike/Matrix Spike Duplicate: The matrix spike and matrix spike
duplicate sample will be collected in the same manner as the other samples. At
the laboratory an appropriate spike of PFAS will be added to the sample and the
sample analyzed for the same parameters as the other co-located samples.
4.5 Sample Packing and Shipping
Upon sample collection, each containerized sample will be labeled and placed as soon as
possible into an insulated sample cooler. The cooler will serve as a shipping container
and will be provided by the laboratory along with the appropriate sample containers.Wet
ice will be placed around the sample containers within heavy-duty plastic bags within the
sample cooler. Samples will be maintained at a cool temperature (optimum 4°Celsius±
2°Celsius) from the time of collection until the coolers arrive at the laboratory (if
required).Plastic"bubble wrap"and/or polystyrene foam may also be used to protect the
samples during shipping.
Prior to shipment of the samples to the laboratory, a chain-of-custody form will be
completed by the field sample custodian. Sample locations, sample identification
numbers, description of samples, number of samples collected, and specific laboratory
analyses to be run on each sample will be recorded on the chain-of-custody form.
Samples for the first two months of sampling will be shipped to either TestAmerica
Sacramento, TestAmerica Denver, or Lancaster Laboratories depending on laboratory
availability at the time of sampling. After the first two months, samples will be sent to
the onsite laboratory for analysis provided the detection limits at the onsite laboratory
have been demonstrated to be sufficiently sensitive to demonstrate a 99%reduction in the
concentration of the three indicator parameters by the Treatment System.' Samples will
be analyzed using the methods shown in Table 1.
'As of September 2020,the Fayetteville Works Onsite laboratory had a detection limit of 100 nanograms
per liter (ng/L) i.e. parts per trillion for most Table 3+ compounds. The ability to demonstrate a 99%
reduction will therefore be contingent upon the concentration of influent samples being above 10,000 ng/L.
SW Sampling Plan 20200930 5 September 2020

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NC License No.:C:-3500 and C295
5 CALCULATIONS
The Treatment System PFAS removal efficiency will be calculated using information
collected as part of this sampling program. Treatment System PFAS removal
effectiveness will be defined by the percentage removal of the combined concentrations
of the three indicator parameters (HFPO-DA, PFMOAA and PMPA). Removal
effectiveness will be determined on a quarterly average basis using composite influent
and effluent samples. The system PFAS removal efficiency calculation uses volume
weighted concentrations of the influent and effluent samples to calculate the percentage
of mass removal.Volume weighted concentrations were developed in the event that either
the influent and effluent autosamplers have different compositing durations or that the
composite sampling periods in the quarter have different durations(e.g. 12 hours and 32
hours).Both circumstances could arise due to a potential equipment malfunction or severe
weather event. Weighting by volume provides a representative assessment of mass
present in both the influent and effluent over time; samples corresponding to greater flow
volumes will have a proportionately higher weight.The Treatment System PFAS removal
efficiency will be calculated using Equation 1 below.
Equation 1:System Removal Effectiveness for Indicator Parameters
ceff 0
ETS—IXM—Ind = 1\1 —• •/I X 100�0
Cinf
M i=3
—Lam=11i=1 Ceff,m,i X Wml X 100%
C1 Zn=1 Gi=1 dinf,n,i. X wn
M 1 Vm
Zm=i Zi==31 Ceff,m,i X ZM
= 1 — Viu'" x100%
�N i=3 n
n=1 L.11=1 Cinf,n,i x
n=1 n
where,
ETS-IXM-Ind = is the Treatment System PFAS removal efficiency for the three
indicator parameters HFPO-DA,PMPA,and PFMOAA;
ceff= is the volume weighted effluent concentration for a given evaluation period;
cin f = is the volume weighted influent concentration for a given evaluation period;
SW Sampling Plan_20200930 6 September 2020

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NC License No.:C 3500 and C 295
m =represents an individual effluent composite sample time interval during a given
evaluation period;
M = is the total number of effluent composite sample time intervals during a given
evaluation period;
n = represents an individual influent composite sample time interval during a given
evaluation period;
N = is the total number of influent composite sample time intervals during a given
evaluation period;
i=represents the three indicator parameters HFPO-DA,PMPA, and PFMOAA;
ceff,m i = is the measured concentration of the three indicator parameters for each
effluent composite samples2;
cinf,n,i = is the measured concentration of the three indicator parameters for each
influent composite samples2;
wm = is the effluent concentration volumetric weighting factor calculated for and
applied individually to each effluent composite sample concentration;
I'm = is the volume of water entering (and exiting) the Treatment System during the
effluent composite sample collection period;
min = is the influent concentration volumetric weighting factor calculated for and
applied individually to each influent composite sample concentration; and
Vn = is the volume of water entering (and exiting) the Treatment System during the
influent composite sample collection period.
6 REPORTING
By September 30,2021 Chemours will submit to DEQ a report evaluating the Treatment
System's capture of stormwater from the drainage area for rain events up to the 1-inch,
24-hour design storm and removal of PFAS compounds as measured by concentrations
of indicator parameters HFPO-DA,PMPA,and PFMOAA.
2 Non-detect influent and effluent sample results will be assigned a value of zero for the calculation and the
values from duplicate samples will be averaged together.
SW Sampling Plan_20200930 7 September 2020

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NC License No.:C 3500 and C-295
7 POTENTIAL ADJUSTMENTS
The sampling and calculation methodologies described in this report have been outlined
based on the present understanding of Site conditions. If conditions or methods change,
modifications may need to be made to this plan. Any modifications made will be
described in future submitted reports.
SW Sampling Plan_20200930 8 September 2020

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Geosyntec Consultants of NC,P.C.
NC License No.:C-3500 and C-295
8 REFERENCES
AECOM, 2018. Poly and Perfluoroalkyl Substance Quality Assurance Project Plan for
the Chemours Corporate Remediation Group.
Geosyntec, 2020. Site Conveyance Network and Outfall 002 PFAS Mass Loading
Calculation Protocol. 31 August 2020.
SW Sampling Plan_20200930 9 September 2020

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ueos}1uee Consultants of NC,PC..
NC License No.:C.3500 and C,295
TABLES

DocuSign EnvE ID:CE09CE50-91 DD-4BFB-82E0-B876714C45BC
TABLE 1 Geosyntec Consultants of NC P.C.
SAMPLING AND ANALYSIS
Chemours Fayetteville Works,North Carolina
Sample Collection'
Parameter/Measurement Sample Type Measurement Type Analytical Method
Bypass` EQ Tank Influent Effluent
HFPO-DA,PMPA,PFMOAA Time-weighted Lab Analysis Table 3+Lab SOP X X
composite
— -Flow Continuousb Field Parameter X X
Water Level X
Notes:
'Sampling will be performed during wet weather,when the Treatment System is discharging treated stormwater.Samples will be collected up to four times per month during the first two
months.Following the first two months of operation,sampling will be conducted up to twice per month.
b Continuous measurements will be collected at appropriate intervals(e.g.,5 or 15 minutes).
Bypass flow will be measured at the overflow weir from the diversion sump/lift station,or both in the channel just downstream of the diversion sump/lift station and in the pipe conveying
NCCW,just upstream of discharge into the channel,where the difference represents stormwater flow bypassing the Treatment System,or some other method.
TR0795 September 2020

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NC License No.:C 3500 and C,295
FIGURES

g N
DocuSi n lope ID: CEO9CE50-91DD-4BFB-82E0 B876714C456C
;Ai t il . Ilk,., Pir'" 4 ,. .
ikalt. - .. -4\4* , ja.-1...1.1.'
t f
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" ► °"`
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t_ ,: �. ///� Proposed Stormwater
' V///l! Treatment Sy
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Y R
,
, , iiik
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+ e F^ :. ' Stormwater Treatment
10,
,: i +
.,it ., System
. : .
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it
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t
t' C
'�� Ili.t 125 62.5 0 125 Feet
E ,��g
a
"va' a Proposed Stormwater
. r Treatment System Location
E .' N "11 tl. { Chemours Fayetteville Works, North Carolina
E ,\ _._—' r d' eory L A w — Geosynteco fn^ef 1 ,.rrt M1C.Hf.
N consultants
NCILn.eN L3,NInn,Ic2M1 Figure
t P it _1 ! _. Raleigh September 2020
'Projection NAD 1983 StetePlene North Cero+ne FIRS 3200 Feel,Units in Foot US