NC0089915_Modification_20230106 (2)

DocuSign Envelope ID:F7A81316-77F6-4EC2-B44B-07B3BAE9022E
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ROY COOPER `,. .
Governor - it
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`ELIZABETH S.BISER v s',�a
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Secretary 4rauwv°A '
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
January 6,2022
Ms Davn Hughes, Plant Manager
The Chemours Company
Fayetteville Works
22828 NC Highway 87 W
Fayetteville, North Caolina28306
SJbjea: NPDESMinor Modificaion
Permit N C0089915
Fayetteville Works
Blades County
Facility Physic-Chemic Grade I I
Dear Ms Hughes
The Division staff has reviewed your request for modificion of the subject permit. Your request
has been granted. Therefore, the Division made amendments to the list of the equipment employed
by the wastewater treatment system. I n addition, the Division added a requirement to develop an
Operation aid Maintenance Plat for the intake settlement pond.
Please insert the enclosed corrected and amended sheets and discard the old sheets. This permit
modification becomes effective on the effective date of the permit. No other changes have been
made. This permit modification is issued pursuant to the requirements of North Carolina GenaJ
Statute 143 215.1 and the Memorandum of Agreement between North Caolina and the U.S
Environmental Protection Agency.
Please take notice that this permit is not transferable. Part I I, E.4. addresses the requirements to be
followed in case of change in ownership or control of this dischage.
If you have any questions or need additional information, please contact Saga Chernikov at the
following e-mail addr • 9Srgei.chernikov( ncdenr.gov, or telephone number: 919-707-3606.
S ncerely,
DocuSigned by:
VbiAl(.A.S (i V ow4,t t.
deE'.ARbgers, Jr., Director
Division of Water Resouro
cc: Central File:
NPDESFila
Fayetteville Regional Office'Water Quality
WSS'Aquetit;Tuxiwluyy UI lit (e-wpy)
EPA Region IV (e-copy)
D E _- North Cao net Dery ar ent of EnvironnrntA o uality I Division d Wata Resources
512NorthSalistwrySlreet 1611MaIServiceCerder I R�eigh,NorthCarolina27699-1611
919.707.9000

Chemours 002 NC0089915
SUPPLEMENT TO PERMIT COVER SHEET
The exclusive authority to operate and discharge from this facility arises under the permit conditions,
requirements,terms, and provisions included herein.
The Chemours Company FC,LLC
is hereby authorized to:
1. Operate a 1.58 MGD wastewater treatment facilities consisting of:
• dual lift station pumps to WWTP(Oxidation Tanks)or to the settling pond
• intake settling pond(used as required for solids settlement)
• two influent oxidation tanks,coagulation, and pH adjustment tank;
• three booster pumps;
• three ultrafiltration units;
• OF filtrate tank and conical settling tank
• two trains of three granular activated carbon(GAC)adsorption units;
• polymer make down/injection system;
• in-line mixer and thickener unit;
• centrifuge skid;
• return filtrate pump;
2. Discharge treated surface water, treated filter backwash, stormwater, and groundwater, including
groundwater from the existing Black Creek Aquifer monitoring wells, through Outfall 003 at the
location specified on the attached map into the Cape Fear River,a class WS-IV water in the Cape Fear
River Basin;

Permit NC0089915
is no longer technically feasible. However, notwithstanding any such revision, Chemours shall continue to
operate the Treatment System at optimal efficiency.
5. Chronic Toxicity (Ceriodaphnia) P/F @ 12.5%; quarterly during February, May, August, November; see
condition A.(2.)of this permit.
6. Sufficiently sensitive test methods shall be used to analyze for Silver.The Division shall consider all effluent
Silver values reported below the PQL to be in compliance with the Monthly Average Silver limit.As of the
effective date of this permit,DWR recommends a target PQL of 1.0 µg/L for Silver.
7. After 12 months of sampling the facility can apply for a reduction in sampling if all the sampling results
demonstrate concentrations below detection levels. The facility shall be employing the sufficiently sensitive
test methods.
8. The permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the stream.If the permittee is a member of the Monitoring Coalition Program,
sampling for instream hardness may be waived as long as the Monitoring Coalition agrees to sample hardness
at the nearest upstream location,at a minimum frequency of quarterly,and the permittee has obtained approval
from DWR-NPDES Permitting Unit that the upstream station being monitored by the coalition is representative
of the receiving stream for this discharge. The permittee is responsible for submitting instream hardness test
results with its DMRs as results are received from the coalition. If coalition membership is cancelled or the
Monitoring Coalition terminates instream hardness sampling at the approved station, the permittee will
immediately notify the Division and resume sampling for instream hardness, upstream of its discharge, as
required in Section A. (1.).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
The facility shall develop a Dam (collection system) Operation and Maintenance Plan (Plan) to ensure
maximum dry weather flow(—610 gpm)in the channel is consistently captured and treated. Similar efforts
shall be applied at the sumps/dams or other devices that will be used to capture water from the seeps.
The Plan shall be provided to the DEQ no later than October 18, 2020 for review and approval. Upon
approval,the Plan becomes an integral part of the permit.
The facility shall also develop an intake settling pond Operation and Maintenance Plan (Plan) to ensure
efficient operation of the treatment system and disposal of solids.
The Plan shall be provided to the DEQ no later than July 1,2023 for review and approval. Upon approval,
the Plan becomes an integral part of the permit.
The facility shall complete and submit EPA Form 2C for this Outfall no later than March 30,2021.
From time-to-time the Middle Cape Fear River has experienced flooding conditions which are documented to cause
a significant increase in water levels below Lock and Dam #3, consistent with the location of proposed Outfall
003. During these events a backwater condition propagates upstream in the"Old Outfall 002 Stream". Historical
observation indicates that the Old Outfall 002 Stream levels can rise significantly(consistent with the flooded Cape
Fear River levels)and would be expected, at times,to be equal to or significantly greater than the invert elevation
of the treatment system intake dam and associated pumping system. During these flooded backwater conditions
elevated sediment load and reduced flow velocity gradients are expected to cause significant sediment deposition
within the collection dam and pumping structure. The sediment load may cause failure of the pumping and
treatment system during the flooded backwater condition. Requirement for treatment shall be suspended during
these force majeure flooding events and be allowed 48 hours after the backwater stream level falls below the invert
of the intake collection dam to safely maintain the influent collection structure and re-initiate collection and
treatment. The triggering Cape Fear River flood elevations; event documentation and notification requirements;
and procedure for treatment cessation and safe restart shall be included in the approved Dam Operation and
Maintenance Plan.Whenever treatment is suspended under this condition,the permittee shall document the flooding
in the DMR for that month including the time of flooding above the intake,when the water recedes below the intake
invert,and time that treatment resumes.
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