NC0024970_Modification_20240628

DocuSign Envelope ID:9A66E1 DF-78DB-4A28-9C86-1 E0882FO8351
ESN`STATE
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ROY COOPER
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Governor
ELIZABETH S.BISER
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
June 27, 2024
Mr. Joseph Lockler, Operations Chief
Charlotte Water
5100 Brookshire Boulevard
Charlotte,North Carolina 28216
Subject: Minor NPDES Permit Modification
Permit NCO024970
McAlpine Creek WWMF
Mecklenburg County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Lockler:
The Division of Water Resources (Division) received a letter from Charlotte Water on June 21, 2024
requesting a minor modification to NPDES Permit NCO024970 McAlpine Creek WWMF to extend the
deadline for submittal of Significant Industrial User (SIU) permit modifications as required in NPDES
Permit NCO024970 Part I Special Condition A.(10.)(c)(ii)from July 1, 2024 to August 1,2024.
As stated in the request letter, Charlotte Water has already put a quarterly monitoring program in place for
PFAS at the facility and at the SIUs expected or suspected of PFAS discharges. As such, the Division
approves your request to extend the deadline for submittal of Significant Industrial User (SILT) permit
modifications and has updated the language in Part I Special Condition A.(10.)(c)(ii)[Page 13] accordingly.
Please insert the attached page into your permit and discard the original page.
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable
to you,you have the right to an adjudicatory hearing upon written request within thirty(30)days following
receipt of this letter. This request must be in the form of a written petition,conforming to Chapter 150B of
the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail
Service Center,Raleigh,North Carolina 27699-6714). Unless such demand is made,this decision shall be
final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by the Division of Water Resources or any other Federal,
State, or Local governmental regulations.
If you have any questions concerning this permit,please contact Nick Coco at(919)707-3609 or via email
at [e-mail].
l ed by: Al � 'e.''`
AUv&"WW
C464531431644FE...
Michael J. Montebello
NPDES Permitting Branch Chief
Division of Water Resources,NCDEQ
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality/Andrew Pitner
Charlotte Water/Environmental Compliance Manager/Bill Gintert
E Q�� North Carolina Department of Environmental Quality I Division of Water Resources
4512 North Salisbury Street 1 1611 Mail Service Center I Raleigh,North Carolina 27699-1611
NO CARO�INA _
DeperVneM of EnWronmenGl puall� 919'707'900(]

DocuSign Envelope ID:9A66E1 DF-78Dl3-4A28-9C86-1 E0882FO8351
Permit NCO024970
(ii.) The Permittee shall identify and locate each Significant Industrial User (SIU) in the approved
pretreatment program in industry categories expected or suspected of PFAS discharges to the McAlpine
Creek WWMF; and begin sampling of and modify Industrial User Permits (IUPs) for each SIU
identified as suspected of PFAS discharges to the McAlpine Creek WWMF to ensure sampling begins
within six months of the permit effective date,by August 1,2024.
(iii.) Update Industrial Waste Survey(IWS)Inventory:POTWs must identify and locate all possible indirect
dischargers that might be subject to the pretreatment program and identify the character and volume of
pollutants contributed to the POTW by the indirect dischargers (see 40 CFR 403.8(f)(2)). As EPA
regulations require, this information shall be provided to the Division (see 40 CFR 122.440) and 40
CFR 403.8(f)(6)) as part of the 2024 Pretreatment Annual Report(PAR).The IWS inventory shall
be revised,as necessary,to include all indirect dischargers in industry categories expected or suspected
of PFAS discharges.' (see 15A NCAC 02H .0906(b)(2)).
(iv.) The Permittee shall begin sampling of and/or issue IUPs for each indirect discharger identified as
suspected of PFAS discharges to the McAlpine Creek WWMF to ensure sampling begins within six
months of completion of the IWS.
(v.) The Division has determined that all SIUs and indirect dischargers identified above analyze their
discharge for PFAS at the same quarterly sampling frequency and with the same analytical
method to ensure protection of human health and the environment due to the potential health hazards
associated with PFAS. Collection and evaluation of this information will also assist the Department in
developing sound policies with respect to PFAS in the environment.
(vi.) The Permittee shall ensure that IUPs within the McAlpine Creek WWMF service area are modified or
reissued, new IUPs are issued, and other Pretreatment Program mechanisms are completed to address
PFAS discharges to POTWs.
(vii.) In the absence of local limits, and based upon data as they become available, POTWs shall encourage
Best Management Practices (BMPs), pollution prevention, product substitution, and good
housekeeping practices to make meaningful reductions in PFAS introduced to POTWs. Such BMPs
could be like those included in the EPA Office of Water, December 5, 2022, "Addressing PFAS
Discharges in NPDES Permits and Through the Pretreatment Program and Monitoring Programs."A3.
"Best Management Practices (BMPs) for discharges of PFAS, including product substitution,
reduction, or elimination of PFAS, as detected by draft method 1633".
(viii.)A summary of all actions taken by the Permittee and their industries and monitoring conducted by each
indirect discharger identified as part of this Special Condition shall be provided as part of the PAR(see
15A NCAC 02H .0908(b)).
A.(11.) 1,4-DIOXANE RE-OPENER
[NCGS 143-215.1 (b)]
Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in the North Carolina
Administrative Code at 15A NCAC 2H.0112 (b)(1)and 2H.0114(a)and Part II, Sections B-12 and B-13 of this
permit,the Director of DWR may reopen this permit to modify permit requirements to address 1,4-Dioxane
monitoring,treatment and/or compliance.
A.(12.) MERCURY MINIMIZATION PLAN(MMP)
[N.C.G.S. 143-215.1 (B)]
The Permittee shall maintain and continue to implement the Mercury Minimization Plan(MMP)developed in the
previous permit term. The MMP shall continue to be available for inspection on-site. The MMP should place
emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and
submitted with the next permit renewal. Performance of the MMP will meet the requirements of the TMDL(Total
Maximum Daily Load) for mercury approved by USEPA on October 12,2012,unless and until a Waste Load
Allocation specific to this facility is developed and this NPDES permit is amended to require further actions to
address the Waste Load Allocation.
LDocuSigned byy:Ul•� 'e.''`
AN&Ad
Page 13 of 18 Michael Montebello, NPDES Branch Chief
Effective Date:June 27,2024