NC0031836_Permit (Issuance)_20240510

DocuSign Envelope ID:C70DD7A2-5015-4499-9827-367952790D6F
ROY COOPER te. .c
Governor
ELIZABETH S.BISER �' "J
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
May 10, 2024
Mr. Andy Smith
Water Resources Operations Manager
City of Statesville
PO Box 1111
Statesville, North Carolina 28687
Subject: Final NPDES Permit Renewal
Permit NC0031836
Fourth Creek WWTP
Iredell County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Smith:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between
North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007(or as subsequently
amended).
No changes were made to the draft permit sent to you on March 23, 2024. The permit
maintains the following significant changes identified in the letter sent on March 23, 2024:
• To allow the City to develop and implement an action plan to come into compliance with the
revised Ammonia limits, a three (3) year compliance schedule has been added to the permit
[See Special Condition A.(5.)].
• In light of the added compliance schedule, current Ammonia permit limits have been re-
inserted to the permit as interim limits and the revised limits are labeled as final limits [See
A.(1.)].
• Since the annual average flow had exceeded 90% of 4.0 MGD (i.e., 3.6 MGD) in 2020 and all
authorized equipment for the 6.0 MGD flow tier has been verified as constructed/installed, the
Fourth Creek WWTP has entered the 6.0 MGD flow tier. As such, Effluent Limitations and
Monitoring Requirements for the 4.0 MGD flow tier have been removed from the permit.
• Per the results of instream waste concentration (IWC)-based calculations for ammonia-
nitrogen, ammonia nitrogen limits have been revised [See A.(l.)].
• To better understand nitrogen pollution characteristics, Total Kjeldahl Nitrogen (TKN) and
Nitrate-Nitrite (NO3+NO2) monthly monitoring have been added to the permit.
• Based on the reasonable potential analysis (RPA) showing reasonable potential to violate state
water quality standards based on one result above the allowable concentration, monthly
v
D— iron�'7� North Carolina Depanmcrul Qury I Division of Water es
512 North Salisbury Streetent I of l6lEn I Mail Senenta ice Centerati I Raleigh.North CaroResourclina 27699-1611
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DocuSign Envelope ID:C7ODD7A2-5015-4499-9827-36795279DD6F
monitoring requirements for Total Chromium, Chromium IV, and Total Nickel have been
added to the permit. [See A.(1.)].
• Based on the RPA predicting maximum effluent lead and zinc concentrations greater than half
of their respective allowable discharge concentrations based on state water quality standards,
quarterly monitoring for Total Lead and Total Zinc have been added to the permit [See A.(1.)].
• Based on the RPA finding a reasonable potential to exceed water quality standards involving
a small sample size (i.e., < 8 samples), quarterly monitoring for Bis(2-ethylhexyl) phthalate
has been added to the permit [See A.(1.)].
• Instream monitoring requirements have been moved to a separate condition [See A.(2.)].
• To better understand nutrient impacts on the receiving stream,which flows to High Rock Lake
that is impaired for Chlorophyll-a, Total Nitrogen, TKN, NO3+NO2 and Total Phosphorus
monitoring upstream and downstream of the outfall have been added to the permit at a monthly
frequency [See A.(2.)].
• Some of the wording has changed in Special Condition A.(3.), Chronic Toxicity Permit Limit,
please review each paragraph carefully.
• Some of the wording has changed in Special Condition A.(4.), including the specific three
years in which the Effluent Pollutant Scan shall be performed (2026, 2027, and 2028), please
review each paragraph carefully.
• Based on MercuryTMDL evaluation showingmercuryvalues reported at levels > 1 ng/L and
P g
since the permitted flow is greater than 2 MGD, Special Condition A.(7.) Mercury
Minimization Plan has been reworded toward its maintenance.
• Based on the potential of 1,4-Dioxane passing through the WWTP system from certain
industrial user types including metal finishers, quarterly monitoring for 1,4-Dioxane at Outfall
001 with an option to request reduction to annual monitoring after 24 months has been added
to the permit [See A.(1.)]. In addition, a 1,4-Dioxane reopener condition has been added to the
permit [See Special Condition A.(8.)].
• To assess industrial contributions of PFAS chemicals to Fourth Creek WWTP and assess levels
of PFAS in the facility effluent, Special Condition A.(9.) has been added to the permit.
• A notation was made concerning the Electronic Reporting Rule—NPDES Electronic Reporting
Rule—Phase 2 Extension. EPA extended the Phase 2 deadline to December 21, 2025.
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and program reports. The requirement to continue reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR) interne
application has been added to your NPDES permit [See Special Condition A.(10.)].
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.
1
D E ...- North
Carolina Department of Environmental Quality I Division of Water Resources
J/
512 North Salisbury Street I1611 Mail Service Center I Raleigh,North Carolina 27699-1611
Ow..0 enWon.o:w a r\ r 919.707.9000

DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Pretreatment updates in response to NPDES permit renewal:
• On November 28,2024, 180 days after the effective date of this NPDES permit renewal,the City
is required to submit to the Division a written technical evaluation of the need to revise local limits
(i.e.,an updated IWS/HWA-AT/L-STMP,or documentation of why is not needed).This action may
include revising,updating,or adding to the list of SIUs regardless of timeframe.
o Submit the updated Long-Term Monitoring Plan(LTMP)
• If there are new industries within the service area, submit an updated Industrial
Waste Survey(IWS)
• Review pollutants of concern(POCs)and update the LTMP to reflect pollutants in
industrial user permits(IUPs)and sludge management permit.
o As part of the local limits assessment, please submit the updated Headworks Analysis
(HWA).
The NPDES standard conditions(Parts II, III, and IV)that are a part of the permit are not included in this
draft document(cover, map, and Part I). The conditions are the same as in your current permit except that
agency and division names have been updated. The latest version is available at https://bit.ly/3k5NFaL and
can be viewed online or downloaded as a PDF file.
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 Gary Perlmutter at(919)707-3611 or via
email at [e-mail].
Sincerely, ,-t>ausgn.dby:
A'l.iCLU t,i, A4.1514t,bt U
`—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& Wes Bell
DWR/Operator Certification Program/Jeff Talbott
DWR/Ecosystems Branch/Tammy Hill
DWR/Aquatic Toxicology Branch/Cindy Moore & Molly Nicholson
DWR/Municipal Permitting Unit/Keyes McGee
City of Statesville/Kenneth Galloway (ORC)
D—� .'1� North Carolina Department of Ensirontnental Quality I Division of Water Resources
v 512 North Salisbury Street I1611 Mail Service Center I Raleigh.North Carolina 27699-1611
0.0.1...1.0 i.wu.,.ssr ausni 919.707.9000

DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this permit issuance effective date, any previously issued permit bearing this number is no
longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises
under the permit conditions, requirements, terms, and provisions included herein.
The City of Statesville
is hereby authorized to:
1. Operate and maintain the Fourth Creek Wastewater Treatment Plant,an existing 6.0 MGD facility
consisting of the following components:
• Influent Pump Station
• Perforated panel bar screens (2)
• Extended aeration basins(2)with mechanical aerators(6 per basin)
• RAS and WAS pumps(2 each)
• Secondary wet well
• Secondary Clarifiers (3)
• Hypochlorite disinfection
• Sodium Bisulfite de-chlorination
• Aerobic digester with mechanical aerators(3)
• Belt filter press
• Alkaline sludge stabilization
2. Discharge from said treatment works at the location specified on the attached map via Outfall 001
into the Fourth Creek classified C waters in the Yadkin-Pee Dee River Basin and 03040102 HUC.
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
PART 1
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [6.0 MGD[
[15A NCAC 02B .0400 et seq., 15A NCACO2B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G.0302]
(a.) During the period beginning on the effective date of the permit and lasting until expiration, the
permittee is authorized to discharge treated municipal and industrial wastewater from Outfall 001.
Such discharges shall be limited and monitored' by the permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location
Flow 50050 6.0 MGD Continuous Recording Influent or
Effluent
BOD,5-day,20°C2 Influent&
(Apr 1 -Oct 31) C0310 17.0 mg/L 25.5 mg/L Daily Composite Effluent
BOD,5-day,20°C2 Influent&
(Nov 1 Mar 31) C0310 27.0 mg/L 40.5 mg/L Daily Composite Effluent
Total Suspended Solids(TSS)z C0530 30.0 mg/L 45.0 mg/L Daily Composite Influent&
Effluent
Ammonia(NH3 as N)
(Apr 1 Oct 31)interim 3 C0610 2.0 mg/L 6.0 mg/L Daily Composite Effluent
Ammonia(NH3 as N) C0610 4.0 mg/L 12.0 mg/L Daily Composite Effluent
(Nov 1 -Mar 31)interim 3
Ammonia(NI13 as N)
(Apr 1-Oct 31)final 3 C0610 1.6 mg/L 4.8 mg/L Daily Composite Effluent
Ammonia(NH3 as N)
(Nov 1 -Mar 31)final 3 C0610 3.7 mg/L 11.1 mg/L Daily Composite Effluent
Dissolved Oxygen(DO) 00300 Daily Average>_5.0 mg/L Daily Grab Effluent
Fecal Coliform 31616 200/100 mL 400/100 mL Daily Grab Effluent
(geometric mean)
Total Residual Chlorine(TRC)4 50060 28 µg/L Daily Grab Effluent
Temperature(°C) 00010 Monitor and Report Daily Grab Effluent
Conductivity(µmhos/cm) 00094 Monitor and Report Daily Grab Effluent
Total Kjeldahl Nitrogen(TKN) 00625 Monitor and Report Weekly Composite Effluent
(mg/L)
Nitrate Nitrite(NO3-N+NOz N) 00630 Monitor and Report Weekly Composite Effluent
(mg/L)
Total Nitrogen 5(mg/L) C0600 Monitor and Report Weekly Calculated Effluent
Total Phosphorus(mg/L) C0665 Monitor and Report Weekly Composite Effluent
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab Effluent
Total Hardness(as CaCO3)6 00900 Monitor and Report Quarterly Composite Effluent
(mg/L)
Total Chromium(µg/L) 70028 Monitor and Report Monthly Composite Effluent
Chromium VI 01032 Monitor and Report Monthly Composite Effluent
Total Copper 01042 23.9 µg/L 31.0 µg/L Monthly Composite Effluent
Total Lead(µg/L) 01051 Monitor and Report Quarterly Composite Effluent
Total Nickel 01067 Monitor and Report Monthly Composite Effluent
Total Zinc(µg/L) 01092 Monitor and Report Quarterly Composite Effluent
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location
Bis(2-ethylhexyl)phthalate 39100 Monitor and Report Quarterly Composite Effluent
(µOO
1,4-Dioxane 7(µg/L) 82388 Monitor and Report Quarterly Grab Effluent
PFAS(ng/L)8 various Monitor and Report Quarterly Grab Influent&
Effluent
Chronic Toxicity 9 TGP3B Monitor and Report Quarterly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 10 Footnote 10 Effluent
Footnotes:
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A.(10.).
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15%of the respective influent value
(85%removal).
3. The Permittee shall achieve compliance with the final limits within three years of the effective date of this permit
and shall follow Schedule of Compliance for Ammonia Limitations detailed in Special Condition A.(5.).Interim
limits are effective June 1,2024.
4. The facility shall monitor TRC when using chlorination for disinfection.The Division shall consider all effluent
total residual chlorine values reported below 50 µg/L to be in compliance with the permit. However,the Permittee
shall continue to record and submit all values reported by a North Carolina certified laboratory(including field
certified),even if these values fall below 50 µg/L.
5. For a given wastewater sample,TN=TKN+NO3-N+NO2-N,where TN is Total Nitrogen,TKN is Total Kjeldahl
Nitrogen,and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen,respectively.
6. Effluent Hardness sampling shall be performed in conjunction with testing for hardness-dependent metals
(cadmium,chromium,copper,lead,nickel,silver and zinc).
7. Samples shall be analyzed and reported using sufficiently sensitive test procedures(i.e.,methods)approved under
40 CFR Part 136 for the analysis of pollutants of pollutant parameters. After a 24-month sampling period, the
Permittee may request the Division conduct a review of submitted data for assessment and approval of a 1,4-
Dioxane monitoring frequency reduction from quarterly to annually.
8. Follow Special Condition A.(9.).
9. Chronic Toxicity(Ceriodaphnia dubia)P/F at 55%with testing in January,April,July,and October.See Special
Condition A.(3.).
10. The Permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A.(4.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
A.(2.) INSTREAM MONITORING REQUIREMENTS [15A NCAC 02B.0500 et seq.]
Beginning on the effective date of this permit and lasting until lasting until permit expiration,the Permittee
shall perform instream sampling upstream and downstream of Outfall 001 as specified below:
MONITORING REQUIREMENTS
PARAMETER
Parameter Code Measurement Sample Type Sample Location'
Frequency
Dissolved Oxygen(mg/L) 00300 Variable' Grab Upstream,Downstream
Temperature(°C) 00010 Variable' Grab Upstream,Downstream
Conductivity(µmhos/cm) 00094 Variable' Grab Upstream,Downstream
TKN(mg/L) 00625 Monthly' Grab Upstream,Downstream
NO3-N+NO2-N(mg/L) 00630 Monthly' Grab Upstream,Downstream
Total Nitrogen(mg/L) C0600 Monthly Calculated Upstream,Downstream
Total Phosphorus(mg/L) C0665 Monthly' Grab Upstream,Downstream
Total Hardness(as CaCO3)2(mg/L) 00900 Quarterly Grab Upstream
Footnotes:
1. Sample locations:Upstream=NCSR 2316(Bell Farm Rd);Downstream=0.5 miles below the discharge point.
Upstream and downstream samples shall be grab samples collected 3/week during June, July, August, and
September and 1/week during the remainder of the year.Instream sampling requirements are provisionally waived
in light of the Permittee's participation in the Yadkin-Pee Dee River Basin Association (YPDRBA). Should
participation in the association cease, all instream sampling requirements are immediately reinstated. Should
representative instream monitoring not be conducted by the YPDRBA, instream monitoring requirements are
immediately reinstated until confirmation of the coalition's activation of such sampling stations are received by
the Division.
2. The Permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the stream.
A.(3.) CHRONIC TOXICITY PERMIT LIMIT(Quarterly)
[15A NCAC 02B .0200 et seq., .0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 55%.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," (Revised December 2010, or
subsequent versions) or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised December 2010, or subsequent versions). The tests will be performed during the months of
January, April, July, and October. These months signify the first month of each three-month toxicity
testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
If the test procedure performed as the first test of any single quarter results in a failure or ChV below
the permit limit,then multiple-concentration testing shall be performed at a minimum,in each of the
two following months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure"(Revised-December 2010, or subsequent versions).
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed,using the parameter code TGP3B
for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original)is to
be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Or,results can be sent to the email, [e-mail].
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of"No Flow"in the comment area of the form.The report shall be submitted to the Water
Sciences Section at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three-month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
A.(4.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[NCGS 143-215.1(b)]
(a.) Effluent Pollutant Scans. The Permittee shall perform a total of three (3)Effluent Pollutant Scans
for all parameters listed below. One scan must be performed in each of the following years: 2026,
2027, and 2028.Analytical methods shall be in accordance with 40 CFR Part 136 and shall be
sufficiently sensitive to determine whether parameters are present in concentrations greater than
applicable standards and criteria. Each annual sample shall coincide with one quarterly toxicity test
each year[see Condition A.(3.)CHRONIC TOXICITY PERMIT LIMIT],and each must be collected
in a different calendar quarter to represent seasonal variation [i.e.,do not sample in the same quarter
every year]. Unless otherwise indicated,metals shall be analyzed as"total recoverable."
Ammonia(as N) C0610 Trans-1,2-dichloroethylene 34546 Bis(2-chloroethyl)ether 34273
Chlorine(total residual,TRC) 50060 1,1-dichloroethylene 34501 Bis(2-chloroisopropyl)ether 34283
Dissolved oxygen 00300 1,2-dichloropropane C0541 Bis(2-ethylhexyl)phthalate C0100
Nitrate/Nitrite 00630 1,3-dichloropropylene 77163 4-bromophenyl phenyl ether 34636
Kjeldahl nitrogen 00625 Ethylbenzene 34371 Butyl benzyl phthalate 34292
Oil and grease 00556 Methyl bromide 34413 2-chloronaphthalene 34581
Phosphorus C0665 Methyl chloride 34418 4-chlorophenyl phenyl ether 34641
Total dissolved solids 70295 Methylene chloride 34423 Chrysene 34320
Hardness 00900 1,1,2,2-tetrachloroethane 81549 Di-n-butyl phthalate 39110
Antimony 01097 Tetrachloroethylene 34475 Di-n-octyl phthalate 34596
Arsenic 01002 Toluene 34010 Dibenzo(a,h)anthracene 34556
Beryllium 01012 1,1,1-trichloroethane 34506 l,2-dichlorobenzene 34536
Cadmium 01027 1,1,2-trichloroethane 34511 1,3-dichlorobenzene 34566
Chromium C0034 Trichloroethylene 39180 1,4-dichlorobenzene 34571
Copper 01042 Vinyl chloride 39175 3,3-dichlorobenzidine 34631
Lead 01051 Acid-extractable compounds: Diethyl phthalate 34336
Mercury(Method 1631E) COMER P-chloro-m-cresol 34452 Dimethyl phthalate 34341
Nickel 01067 2-chlorophenol 34586 2,4-dinitrotoluene 34611
Selenium 01147 2,4-dichlorophenol 34601 2,6-dinitrotoluene C0626
Silver 01077 2,4-dimethylphenol 34606 1,2-diphenylhydrazine 34346
Thallium 01059 4,6-dinitro-o-cresol 34657 Fluoranthene C0376
Zinc 01092 2,4-dinitrophenol 34616 Fluorene 34381
Cyanide 00720 2-nitrophenol 34591 Hexachlorobenzene C0700
Total phenolic compounds 32730 4-nitrophenol 34646 Hexachlorobutadiene C0702
Volatile oreanic compounds: Pentachlorophenol 39032 Hexachlorocyclo-pentadiene 34386
Acrolein 34210 Phenol 34694 Hexachloroethane 34396
Acrylonitrile 34215 2,4,6-trichlorophenol 34621 Indeno(1,2,3-cd)pyrene 34403
Benzene 34030 Base-neutral compounds: Isophorone 34408
Bromoform 32104 Acenaphthene 34205 Naphthalene 34696
Carbon tetrachloride 32102 Acenaphthylene 34200 Nitrobenzene 34447
Chlorobenzene 34301 Anthracene CO220 N-nitrosodi-n-propylamine 34428
Chlorodibromomethane 34306 Benzidine 39120 N-nitrosodimethylamine 34438
Chloroethane 85811 Benzo(a)anthracene C0526 N-nitrosodiphenylamine 34433
2-chloroethyl vinyl ether 34576 Benzo(a)pyrene 34247 Phenanthrene 34461
Chloroform 32106 3,4 benzofluoranthene 34230 Pyrene 34469
Dichlorobromomethane 32101 Benzo(ghi)perylene 34521 1,2,4-trichlorobenzene C0551
1,1-dichloroethane 34496 Benzo(k)fluoranthene 34242
1,2-dichloroethane 32103 Bis(2-chloroethoxy)methane 34278
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
(b.) Effluent Scan Reporting. Test results shall be reported electronically via eDMR by December 31 st
of each designated sampling year,except that,subject to prior written approval by the Director,results
can be reported on DWR Form DMR-PPA-1 or other form approved by the Director. The Permittee
must at least report completion of the test in the eDMR system by entering"1"or"Y"for parameter
code NC01 —Annual Pollutant Scan. If written reports are approved,the report shall be submitted to
the following address:
North Carolina Division of Water Resources
Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Or the form may be uploaded at: https://edocs.deq.nc.gov/Forms/NPDES_WW-EDMR-
Supplemental-Form
(c.) 2"d-Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in Condition A.(3.)CHRONIC TOXICITY
PERMIT LIMIT], the Permittee shall perform and report the results of four(4) toxicity tests
using the same test methods using a second species of test organism suitable to the tests being
conducted.
(ii.) The 2nd species toxicity tests shall be conducted either:
(A) Once per quarter in a single 12-month period(four samples); if this option is chosen,the
sample for each 2nd species test shall coincide with the quarterly samples collected for
Condition A.(3.)CHRONIC TOXICITY PERMIT LIMIT; or
(B) Once per 12-month period in the four-and one-half year period prior to the scheduled
application for permit renewal (four samples); if this option is chosen,three of the
samples for the 2nd species test shall coincide with those for the annual effluent scans and
the coincident quarterly toxicity test, and each of the four annual samples shall be
collected in a different calendar quarter in order to represent seasonal variation.
(iii.) The results of the toxicity tests shall be submitted to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Or, results can be sent to the email, [e-mail].
(iv.) Results of the 2nd species tests shall also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A when submitting the permit renewal application to the
NPDES Wastewater Program.
The Permittee may contact the Division's Aquatic Toxicology Branch at 919-743-8401 for
guidance on conducting the additional toxicity tests and reporting of the results.
Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival,minimum control organism reproduction,and appropriate environmental controls, shall constitute
an invalid test and will require immediate follow-up testing to be completed no later than the last day of
the month following the month of the initial monitoring.
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DocuSign Envelope ID:C70DD7A2-5015-4499-9827-36795279DD6F
Permit NC0031836
A.(5.) SCHEDULE OF COMPLIANCE FOR AMMONIA LIMITS
[NCGS 143-215.1 (b.);40 CFR Part 122]
(a.) Upon the permit effective date,interim Ammonia limits are in effect.
(b.) By May 31, 2025, the Permittee shall submit to the Division a Corrective Action Plan (CAP) for
Division approval, summarizing the strategy or actions to be taken to achieve compliance with the
final Ammonia limitations listed in Section A.(1.). This plan will include specific dates for
completion or implementation of each action.
(c.) By May 31, 2026, the Permittee shall submit to the Division a summary of actions taken towards
achieving compliance with the final Ammonia limitations specified in Section A.(1.).
(d.) By May 31,2027,the Permittee shall achieve compliance with final Ammonia limitations specified
in Section A.(1.).
(e.) Upon approval of the Corrective Action Plan(CAP)by the Division, the report,actions, and
implementation dates become an enforceable part of this permit. Any modifications to the schedule
shall be requested to the Division at least ninety(90)days before the deadline. Modifications to the
schedule more than four months will be subject to public notice.
(f.) Annual summaries and the CAP shall include the owner's name, NPDES permit number, and
a Permittee contact person and shall be submitted to:
NCDEQ/Division of Water Resources NCDEQ/Division of Water Resources
NPDES Permitting Mooresville Regional Office
1617 Mail Service Center 610 East Center Avenue, Suite 301
Raleigh,NC 27699-1617 Mooresville,NC 28115
(g.) No later than 14 days following each interim date and the final date of compliance, the Permittee
shall notify the Division in writing of its compliance or noncompliance with the interim or final
requirements, or submit progress reports.
A.(6.)NUTRIENT REOPENER FOR HIGH ROCK LAKE [NCGS 143-215.1 (b)]
This permit may be reopened and modified to implement nutrient requirements in accordance with any
future TMDL and/or nutrient management strategy for High Rock Lake.
A.(7.)MERCURY MINIMIZATION PLAN(MMP) [NCGS 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.
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A.(8.)REOPENER FOR 1,4-DIOXANE [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.(9.) PFAS MONITORING REQUIREMENT [NCGS 143-215.1(b)]
(a.) In the absence of an approved 40 CFR Part 136 method published in Federal Register, influent and
effluent PFAS monitoring shall be conducted. The 3"1 draft or more recent wastewater analytical
method 1633 (see 40 CFR 122.21(e)(3)(ii) and 40 CFR 122.44(i)(1)(iv)(B)) shall be used and shall
include all target analytes listed under Table 1 of the method until such time as the Permittee uses the
approved PFAS Method for wastewater.Effective the first full calendar quarter following six(6)months
after EPA publishes a 40 CFR Part 136 PFAS Method for wastewater in the Federal Register,influent
and effluent PFAS monitoring shall be conducted using the approved EPA PFAS Method 1633. See
Appendix A for list of analytes.
(b.)Influent and effluent monitoring using the draft analytical method takes effect the first full
calendar quarter following six (6) months after the effective date of the permit (November 30,
2024)and will be at a quarterly frequency thereafter.
Appendix A has been added to the permit to identify the current analytes listed under Table 1 of Method
1633 Analysis of Per-and Polyfluoroalkyl Substances(PFAS)in Aqueous,Solid,Biosolids,and Tissue
Samples by LC-MS/MS(EPA,January 2024)and the appropriate ICIS codes for use when reporting in
the electronic Discharge Monitoring Reports (eDMRs). The method and list of analytes may also be
found at:
https://www.epa.gov/system/files/documents/2024-01/method-1633-final-for-web-posting.pdf
PFAS Monitoring using the January 2024 Method 1633 shall be reported quarterly using the Division-
provided submittal form. Once PFAS monitoring is conducted using the PFAS Method 1633 in 40 CFR
Part 136, data shall be reported in the monthly eDMRs.
Please note that specific considerations and protocols are required to avoid cross-contamination and
minimize sample bias for PFAS. A current listing of laboratories accredited by the Perry Johnson
Laboratory Accreditation, Inc. (PJLA),ANSI National Accreditation Board(ANAB), or the American
Association for Laboratory Accreditation (A2LA) to perform EPA Method 1633 can be found by
contacting the individual associations. Please note that different labs are accredited for different
matrices.
Sampling and Analytical Notes:
• Sampling shall be planned so that required holding times for analytical methods are met.
• Using one of the analytical laboratories included above will allow consistency in analytical
method and in anticipation of a final method.
• "J" flag values shall be reported when the "J" flag value is associated with the method's upper
bound. "J" flag values need not be reported when less than the method's Minimum Reporting
Level(listed in Method 1633).
• Laboratories approved for Aqueous matrix may be utilized. Please note that the lab used does
not have to be in North Carolina.
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(c.)Pretreatment program activities:
(i.) PFAS Monitoring Applicability: Industry categories known or suspected to discharge PFAS
from the EPA PFAS Strategic Roadmap include: organic chemicals,plastics&synthetic fibers
(OCPSF); metal fmishing; electroplating; electric and electronic components; landfills; pulp,
paper & paperboard; leather tanning & finishing; plastics molding & forming; textile mills;
paint formulating,and airports.This is not an exhaustive list and additional industries may also
discharge PFAS. For example, Centralized Waste Treatment (CWT) facilities may receive
wastes from the aforementioned industries and should be considered for monitoring.There may
also be categories of dischargers that do not meet the applicability criteria of any existing
Effluent Limitation Guidelines(ELG);for instance,remediation sites,chemical manufacturing
not covered by OCPSF,and military bases.'.
'ELG categories of airport deicing,landfills,textile mills,and plastics molding and forming do not
have categorical pretreatment standards, and therefore small-volume indirect dischargers in those
categories would not ordinarily be considered Significant Industrial Users(SIUs)and may not be
captured on an existing IU inventory. IUs under the Paint Formulating category are only subject to
Pretreatment Standards for New Sources(PSNS),and existing sources may need to be inventoried.
(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
Fourth Creek WWTP; and begin sampling of and modify Industrial User Permits (IUPs) for
each SIU identified as suspected of PFAS discharges to the Fourth Creek WWTP to ensure
sampling begins within six months of the permit effective date,by November 30,2024.
(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(0(2)).As EPA regulations require,this information shall be provided to the Division(see
40 CFR 122.44(j)and 40 CFR 403.8(0(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)).
(i.) The Permittee shall begin sampling of and/or issue IUPs for each indirect discharger identified
as suspected of PFAS discharges to the Fourth Creek WWTP to ensure sampling begins within
six months of completion of the IWS.
(ii.) 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.
(iii.) The Permittee shall ensure that IUPs within the Fourth Creek WWTP service area are modified
or reissued, new IUPs are issued, and other Pretreatment Program mechanisms are completed
to address PFAS discharges to POTWs.
(iv.) 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.
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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.(10.) ELECTRONIC REPORTING-DISCHARGE MONITORING REPORTS
[NCGS 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,
2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D.(2.)and Section E.(5.)(a)!
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted monthly electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet.The eDMR system may be accessed
at: https://deq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband access,
then a temporary waiver from the NPDES electronic reporting requirements may be granted and
discharge monitoring data may be submitted on paper DMR forms(MR 1, 1.1,2,3)or alternative forms
approved by the Director. Duplicate signed copies shall be submitted to the following address:
NC DEQ/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting"section below.
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Monitoring results obtained during the previous month(s) shall be summarized for each month and
reported via the eDMR system no later than the last calendar day of the month following the completed
reporting period. Regardless of the submission method, the first DMR is due on the last day of the
month following the issuance of the permit or in the case of a new facility,on the last day of the month
following the commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports,when applicable:
• Sewer Overflow/Bypass Event Reports; and
• Pretreatment Program Annual Reports; and
• Clean Water Act(CWA) Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the time of
each electronic submission. The permittee should use the EPA's website resources to identify the initial
recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each
type of electronic submission and for each state. Instructions on how to access and use the appropriate
electronic reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting
Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-
elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty (60) days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports.The duration of a temporary waiver
shall not exceed 5 years and shall thereupon expire.At such time,monitoring data and reports shall be
submitted electronically to the Division unless the permittee re-applies for and is granted a new
temporary electronic reporting waiver by the Division.Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit monitoring data
and reports on paper to the Division for the period that the approved reporting waiver request is
effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
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http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B.(11.) (b)and Supersedes Section B. (11.)(d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a)or by a duly authorized representative of that person as described in Part II, Section
B. (11.)(b).A person, and not a position, must be delegated signatory authority for eDMR reporting
purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account,please visit the following
web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification[40 CFR 122.22].NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
"I 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
fines and imprisonment for knowing violations."
5. Records Retention 'Supplements Section D. (6.)1
The Permittee shall retain records of all Discharge Monitoring Reports,including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period maybe extended byrequest of the Director at anytime [40 CFR 122.411
q
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Upstream
(Station Q3720000)
IOutfall 001
FoU 1tI 1 r 4)/
\ . ,,,, .),.
Fourth Creek WWTP ` AaurFn-t'. - `*-.
Downstream
(Station Q3735000)
City of Statesville Facility x
Fourth Creek WWTP Location
Latitude' 35'46 36" N 8-digit HUC- 03040102 not to scale
Longitude 80'47 15" W permitted Flow' 4 0,6 0 t.Cf NPDFS Permit No.N00031830
Receivina Strew, Fourth Creek Sub-Basin 03-07-06 North
prainaae Basin' Yadkin Pee-Dee River Basin Stream Class' C Iredell County
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Appendix A. PFAS Target Analytes EPA Method 1633
(EPA, January 2024)
Target Analyte Name Abbreviation CAS Number Parameter
Code
Perfluoroalkyl carboxylic acids
Perfluorobutanoic acid PFBA 375-22-4 51522
Perfluoropentanoic acid PFPeA 2706-90-3 51623
Perfluorohexanoic acid PFHxA 307-24-4 51624
Perfluoroheptanoic acid PFHpA 375-85-9 51625
Perfluorooctanoic acid PFOA 335-67-1 51521
Perfluorononanoic acid PFNA 375-95-1 51626
Perfluorodecanoic acid PFDA 335-76-2 51627
Perfluoroundecanoic acid PFUnA 2058-94-8 51628
Perfluorododecanoic acid PFDoA 307-55-1 51629
Perfluorotridecanoic acid PFTrDA 72629-94-8 51630
Perfluorotetradecanoic acid PFTeDA 376-06-7 51531
Perfluoroalkyl sulfonic acids 1
Perfluorobutanesulfonic acid PFBS 375-73-5 52602
Perfluoropentanesulfonic acid PFPeS 2706-91-4 52610
Perfluorohexanesulfonic acid PFHxS 355-46-4 52605
Perfluoroheptanesulfonic acid PFHpS 375-92-8 52604
Perfluorooctanesulfonic acid PFOS 1763-23-1 52606
Perfluorononanesulfonic acid PFNS 68259-12-1 52611
Perfluorodecanesulfonic acid PFDS 335-77-3 52603
Perfluorododecanesulfonic acid PFDoS 79780-39-5 52632
Fluorotelomer sulfonic acids
1H,1H,2H,2H-Perfluorohexane sulfonic acid 4:2FTS 757124-72-4 52607
1H,1H,2H,2H-Perfluorooctane sulfonic acid 6:2FTS 27619-97-2 52608
1H,1H,2H,2H-Perfluorodecane sulfonic acid 8:2FTS 39108-34-4 52609
Perfluorooctane sulfonamides
Perfluorooctanesulfonamide PFOSA 754-91-6 51525
N-methyl perfluorooctanesulfonamide NMeFOSA 31506-32-8 52641
N-ethyl perfluorooctanesulfonamide NEtFOSA 4151-50-2 52642
Table continues on next page.
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Table continued from Appendix A. PFAS Target Analytes EPA Method 1633 (EPA, January 2024).
Target Analyte Name Abbreviation CAS Number Parameter
Code
Perfluorooctane sulfonamidoacetic acids
N-methyl perfluorooctanesulfonamidoacetic acid NMeFOSAA 2355-31-9 51644
N-ethyl perfluorooctanesulfonamidoacetic acid NEtFOSAA 2991-50-6 51643
Perfluorooctane sulfonamide ethanols
N-methyl perfluorooctanesulfonamidoethanol NMeFOSE 24448-09-7 51642
N-ethyl perfluorooctanesulfonamidoethanol NetFOSE 1691-99-2 51641
Per-and Polyfluorother carboxylic acids
Hexafluoropropylene oxide dimer acid HFPO-DA 13252-13-6 52612
4,8-Dioxa-3H-perfluorononanoic acid ADONA 919005-14-4 52636
Perfluoro-3-methoxypropanoic acid PFMPA 377-73-1 PF002
Perlfuoro-4-methoxybutanoic acid PFMBA 863090-89-5 PF006
•
Nonafluoro-3,6-dioxaheptanoic acid NFDHA 151772-58-6 52626
Ether sulfonic acids
9-Chlorohexadecafluoro-3-oxanonane-l-sulfonic acid 9C1-PF3ONS 756426-58-1 PF003
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid 11C1-PF3OUdS 763051-92-9 PF004
Perfluoro(2-ethoxyethane)sulfonic acid PFEESA 113507-82-7 52629
Fluorotelomer carboxylic acids
3-Perfluoropropyl propanoic acid 3:3FTCA 356-02-5 PF001
2H,2H,3H,3H-Perfluorooctanoic acid 5:3FTCA 914637-49-3 PF007
3-Perfluoroheptyl propanoic acid 7:3FTCA 812-70-4 PF005
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