NC0020117_Draft Permit_20240624

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
ROY COOPER
Governor
ELIZABETH S. BISER
Secretar y
RICHARD E. ROGERS, JR.
Director
Mr. John Cornett, City Manager
City of Clinton
221 Lisbon Street
Clinton, North Carolina 28329
Dear Mr. Connett:
NORTH CAROL INA
Environmental Quality
June 24, 2024
Subject: Draft NPDES Permit Renewal
Permit NCO0201 l 7
Norman H. Larkins WPCF
Sampson County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this
draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are
several changes from the existing permit, including the following:
• To better identify nitrogen in the effluent, monthly monitoring for TKN and NO2+NO3 have been
added to the permit [See A.(1.)].
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to violate state water
quality standards, the limits for Fluoride were removed from the permit, and monitoring frequency was
revised from monthly to quarterly.
• Based on the RPA showing no reasonable potential to violate state water quality standards, monitoring
requirements for Aluminum and Silver have been removed from the permit [See A.(1.)].
• Based on the RPA showing reasonable potential to violate state water quality standards, Total Copper
limits have been added to the permit and the quarterly monitoring requirement has been changed to
monthly monitoring [See A.(1.)].
• To provide an opportunity for the City to develop a plan to assess sources of Total Copper in order to
come in compliance with the limits in Section A. (1.), a 3-year schedule of compliance has been added
to the permit [See Special Condition A. (5.) Schedule of Compliance for Total Copper Limitations].
• Since the dates for all compliance steps except the effective date have passed for Chloride, the
compliance schedule for Chloride limits has been removed from the permit. The effective date of March
1, 2025 is listed for Chloride limits on the effluent sheet; monthly monitoring is required on the permit
effective date [See A.(1.)].
• Based on NPDES guidance regarding the reduction of monitoring frequencies in NPDES permits for
exceptionally performing facilities, monitoring requirements for BOD5, NH3-N and Total Suspended
Solids have been reduced to twice per week [See A.(1.)].
• A special condition to monitor effluent PFAS chemicals 2/year with pretreatment requirements has
been added to the permit, to be effective six (6) months after the permit effective date [See Special
Condition A.(8.) PFAS Monitoring Requirements].
North Carolina Department of EnN ironmental Oualiq I Di%ision of' N'atet Resources
D E Q�� c 12 North Salisburytitreet 1 161I %1a1 Sen ice ('enter I Raleigh. North Carolina 27699 I I
r rH - a mna mn 919.707 9000
Uepnvwa d Emn,w.nenlx anxrr�

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
• Instream monitoring parameters have been moved to a separate section [see A.(2.) Instream Monitoring
Requirements].
• To better identify nutrient patterns and effluent impact on the receiving water nutrient concentrations,
instream monitoring for Ammonia, Total Nitrogen, TKN, NO2+NO3 and Total Phosphorus have been
added to the permit [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 years to sample for the
Effluent Pollutant Scan (2026, 2027, 2028). Please review each paragraph carefully.
• The bar screens were convected by removing the "0.5 &" to list only 1" screens (see Supplement to
Cover Sheet).
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 1). 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.
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Sampson County area, soliciting public comments on this draft permit. Please provide any
written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail
Service Center, Raleigh, NC 27699-1617 no later than 30 days after receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit. If you have questions concerning this draft permit,
please call me at [phone] or by email at [e-mail].
Sincerely,
Dowil"d by
pu�*WIN
9FBB C952DF8455...
Gary Perlmutter, Environmental Specialist II
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR / Fayetteville Regional Office / Water Quality / Trent Allen
DWR / Operator Certification Program / Jeff Talbot
DWR / Ecosystems Branch / Tammy Hill
DWR / Aquatic Toxicology Branch / Cindy Moore & Molly Nicholson
DWR / Municipal Permitting Unit / Keyes McGee
City of Clinton / Lisa Osthues & Blake Raynor
North Carolina Department of Environmental Quality I Division of Water Resources
RE Q�� 512 North SalisburyStreet 1161I Mail Sen ice Center I Raleigh. North Carolina 27699-1611
�, �.0 919.707.9000

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO020117
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended, the
City of Clinton
is hereby authorized to discharge wastewater from a facility located at the
Norman H. Larkins Water Pollution Control Facility
123 Mill Branch Road
Clinton, NC 28328
Sampson County
to receiving waters designated as Williams Old Mill Branch in the Cape Fear River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective Month 1, 2024.
This permit and authorization to discharge shall expire at midnight on January 31, 2029.
Signed this day Month xx, 2024.
DRAFT
Michael J. Montebello, NPDES Permitting Branch Chief
Division of Water Resources
Page 1 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NC0020117
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of the effective date of this permit issuance, 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 Clinton
is hereby authorized to:
Continue to operate a 5.0 MGD wastewater treatment system with a discharge through Outfall
001, consisting of the following treatment units:
• Two (2) mechanically cleaned 1" bar screens
• 44,000-gallon aerated grit removal tank
• Influent Parshall flume with flow recorder and automatic sampler
• Dual 287,718-gallon primary clarifiers
• 85,900 ft high -rate trickling filter
• 259,047-gallon secondary clarifier
• Six (6) 1.2-million-gallon extended aeration activated sludge basins
• Two (2) 713,424-gallon final clarifiers
• 3,000 ft bulk lime feed system
• Five (5) 264 ft anthracite/sand/gravel tertiary filters
• Two (2) 52,000-gallon chlorine contact chambers
• Sulfur dioxide dechlorination
• 62,500-gallon post aeration tank
• 308,426-gallon aerobic digester
• 308,426-gallon aerobic biosolids holding and thickening tank
• Four (4) 142,000-gallon aerobic biosolids digesters
• Thirty (30) 3,000 W sand drying beds.
This facility is located at the Norman H. Larkins Water Pollution Control Facility, 123 Mill
Branch Road, Clinton, in Sampson County.
2. Discharge from said treatment works via Outfall 001, at the location specified on the attached
map into Williams Old Mill Branch, a class C; Sw stream in the Cape Fear River Basin.
Page 2 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO0201 17
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (5.0 MGD)
[15A NCAC 02B. 0400 et seq., 15A NCAC 02B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge treated domestic and industrial wastewater from Outfall 001.
Such discharges shall be limited and monitored' by the Permittee as specified below:
PARAMETER CHARACTERISTICS
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Daily
Measurement
Sample
Sample
Parameter Code
Average
.Average
Maximum
Frequency
Type
Location
Flow 50050
5.0 MGD
Continuous
Recording
Influent or
Effluent
BOD, 5-Day, 20°C 2 C0310
5.0 mg/L
7.5 mg/L
2/week 3
Composite
Influent and
Effluent
(April 1 —October 31)
BOD, 5-Day, 20'C 2 C0310
10.0 mg/L
15.0 mg/L
2/week'
Composite
Influent and
Effluent
(November 1 — March 31)
Total Suspended Solids C0530
2
30.0 mg/L
45.0 mg/l.
2/week'
Composite
Influent and
Effluent
(TSS)
NH3 as N C0610
1.0 mg/L
3.0 mg/ I
2/week 3
Composite
Effluent
(April 1— October 31)
NH3 as N
C0610
2.0 mg/L
6.0 mg/L
2/week 3
Composite
Effluent
(November 1—March 31)
Dissolved Oxygen (DO) 00300
Daily Average >— 6.0 mg/L
Daily
Grab
Effluent
Fecal Coliform 31616
200/]00 mL
400/100 mL
Daily
Grab
Effluent
(geometric mean)
Temperature (°C) 00010
Monitor and Report
Daily
Grab
Effluent
pH 00400
Between 6.0 and 9.0 standard units
Daily
Grab
Effluent
Conductivity (µmhos/cm) 00094
Monitor and Report
Daily
Grab
Effluent
Total Phosphorus (mg/L) C0665
Monitor and Report
Monthly
Composite
Effluent
Total Nitrogen ° (mg/L) C0600
Monitor and Report
Monthly
Calculated
Effluent
NO2+NO3 (mg/L) 00630
Monitor and Report
Monthly
Composite
Effluent
TKN (mg/L) 00625
Monitor and Report
Monthly
Composite
Effluent
Total Residual Chlorine 50060
17 µg/L
Daily
Grab
Effluent
(TRC) s
Total Hardness (as CaCO3) 00900
Monitor and Report
Quarterly
Y
Composite
P
Effluent
(mg,L) 6
Chloride 00940
Monitor and Report
Monthly
Composite
Effluent
Chloride 00940
230 mg/L
230 mg/L
Monthly
Composite
Effluent
(limits effective March 1, 2025)
Total Coppery 01042
23.1 µg/L
34.2 µg/L
Quarterl.
Composite
Effluent
Fluoride 00951
Monitor and Report
Quarterly
Composite
Effluent
PFAS 8 various
Monitor and Report
2/year
Grab
Effluent
Chronic Toxicity 9 TGP3B
Monitor and Report
Quarterly
I Composite
Effluent
Effluent Pollutant Scan NC01
Monitor and Report
Footnote 10
1 Footnote 10
Effluent
Footnotes on next page.
Page 3 of 15

DocuSign Envelope ID. 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NC00201 17
Footnotes from A. 0.) Effluent Limitations and Monitoring Requirements:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application
system; see Section A.(9.).
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of their respective influent
values (85% removal).
3. Sampling 2/week must occur on any two non-consecutive days during the calendar week.
4. For a given wastewater sample, TN = TKN + NO,-N + NO,-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO,-N and NO,-N are Nitrate and Nitrite Nitrogen, respectively.
5. The facility shall monitor TRC when using chlorination for disinfection. The Division shall consider all effluent
TRC 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.
6. Effluent Hardness sampling should be performed in conjunction with testing for hardness -dependent metals
(cadmium, copper, lead, nickel, silver and zinc).
7. The Permittee shall achieve compliance with these limitations within three years of the effective date of this
permit and shall follow the Total Copper compliance schedule detailed in Special Condition A.(5.). Starting on
the effective date of this permit, the Permittee shall perform monthly effluent Monitoring and Reporting for Total
Copper.
8. See Special Condition A (8.).
9. Whole Effluent Toxicity will be monitored using the Pass/Fail Ceriodaphnia dubia at 90% effluent. Samples
shall be taken in March, June, September, December; see Section A.(3.).
10. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Section A.(4.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO0201 17
A.(2.) INSTREAM MONITORING REQUIREMENTS
[15A NCAC 02B .0200 et seq.]
Beginning on the effective date of this permit and lasting until the expiration date, the Permittee shall
perform instream sampling upstream and downstream of Outfall 001 as specified below:
PARAMETER
SAMPLE
MONITORING FREQUENCY
SAMPLE
Parameter Code
TYPE
1
LOCATION
Jun 1—Sep 30
Oct 1—May 31
Temperature (°C)
00010
Surface
3/week
Weekly
Upstream,
Downstream
Dissolved Oxygen (DO) (mg/L)
00300
Surface
3/week
Weekly
Upstream,
Downstream
Conductivity (µmhos/cm)
00094
Surface
3/week
Weekly
Upstream,
Downstream
NH3 as N (mg/L)
C0610
Surface
Monthly
Upstream,
Downstream
Total Phosphorus (mg/L)
C0665
Surface
Monthly
Upstream,
Downstream
Total Kjeldahl Nitrogen (mg/L)
00625
Surface
Monthly
Upstream,
Downstream
NO2+NO3 (mg/L)
00630
Surface
Monthly
Upstream,
Downstream
Footnotes:
1. Upstream = Great Coharie Creek at Five Bridge Road; Downstream = Great Coharie Creek at NC Highway 24.
Samples shall be collected 3/week from June I through September 30, and collected weekly from October 1
through May 31. Instream monitoring for DO, Temperature and Conductivity is provisionally waived in light of
the Permittee's participation in the Lower Cape Fear River Program (LCFRP). Instream monitoring shall be
immediately reinstated and the Division shall be notified immediately should the Permittee end its participation
in the LCFRP.
2. The Permittee shall sample instream Total Hardness, upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream.
A.(3.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200, .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 90%.
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
March, June, September, and December. 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.
Page 5 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NC0020117
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 THP313 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.
NOTE: 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.
Page 6 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO0201 17
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
1,2-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)
COAMR
P-chloro-m-cresol
34452
Dimethyl phthalate
34341
Nickel
01067
2-chlorophenol
34586
2,4-dinitrotoluene
34611
Selenium (PQL < 1 µg/L)
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 conwounds:
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
Page 7 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NC0020117
(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 NCO1 - 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"-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
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.
Page 8 of 15

DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO020117
A.(5.) SCHEDULE OF COMPLIANCE FOR TOTAL COPPER LIMITATIONS (WER STUDY)
[NCGS 143-215.1 (b)]
(a.) This compliance schedule includes the option for pursuing a Water Effect Ratio (WER) study for
developing site -specific limitations and compliance with the Total Copper limits in Section A.(1.).
(i.) If the Permittee wishes to conduct a WER study to develop site -specific limitations for one or
more of the above parameters, then within six (6) months of the effective date of the permit,
the Permittee shall submit to the Division of Water Resources a Water -Effect Ratio (WER)
study plan for approval.
(ii.) Within eighteen (18) months of the WER study plan approval by the Division, the Permittee
shall submit to the Division a report summarizing the results of the WER study.
(iii.) If the WER study results in site -specific limits for one or more of the above parameters that the
Permittee wishes to have in the permit, the Permittee shall submit to the Division a permit
modification request to include the WER-derived limits.
(iv.) The final limits based on the WER-derived limits, if approved will be placed into effect
immediately with the permit modification and all remaining schedule items will be removed.
(b.) If the Permittee does not submit a WER study plan within six (6) months of the permit effective date,
then the Permittee shall follow the Compliance Schedule outlined below (replacing the schedule in
section A.6.a. above) and substitute the dates for one, two and three years from the permit effective
date:
(i.) Within one (1) year of the permit effective date, the Permittee shall submit to the Division of
Water Resources a Corrective Action Plan (CAP) for Division approval, summarizing the
strategy or actions to be taken to achieve compliance with the Total Copper limitations listed
in Section A. (L). This plan will include specific dates for completion or implementation of
each action.
(ii.) Within two (2) years of the effective date of the permit, the Permittee shall submit a report to
the Division summarizing actions taken in accordance with the Action Plan.
(iii.) The Permittee shall achieve compliance with Total Copper limitations specified in Section A.
(L) within three (3) years of the effective date of the permit.
Upon approval of the CAP by the Division, the report and actions become an enforceable part of this permit.
The Division can reopen this permit to implement interim or alternative limits based on studies that
demonstrate an interim or alternate limit is appropriate. 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.
WER Study Plan, CAP and all reports shall include the owner's name, NPDES permit number and
Permittee contact person, and shall be submitted to:
NCDEQ / Division of Water Resources NCDEQ / Division of Water Resources
NPDES Municipal Permitting Unit Fayetteville Regional Office
1617 Mail Service Center 225 Green Street, Suite 714
Raleigh, NC 27699-1617 Fayetteville, NC 28301-5095
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A.(6.) MERCURY MINIMIZATION PLAN (MMP)
[NCGS 143-215.1 (b)]
The Permittee shall maintain and continue to implement the Mercury Minimization Plan (MMP) developed and
implemented on January 9, 2017. 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.
A.(7.) NUTRIENT MONITORING REOPENER
[NCGS 143-215.1 (b)]
Pursuant to N.C. General Statute Section 143-215.1 and the implementing rules found in Title 15A of the North
Carolina Administrative Code, Subchapter 2H, specifically, 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 require supplemental
nutrient monitoring of the discharge. The additional monitoring will be to support water quality modeling efforts
within the Cape Fear River Basin, and shall be consistent with a monitoring plan developed jointly by the Division
and affected stakeholders.
A.(8.) PFAS MONITORING REQUIREMENT
[NCGS 143-215.1(b.)]
(a.) In the absence of an approved 40 CFR Part 136 method published in Federal Register, effluent HAS
monitoring shall be conducted using the 31 draft or more recent wastewater analytical method 1633
(see 40 CFR 122.2 1 (e)(3)(ii) and 40 CFR 122.44(i)(1)(iv)(B)). Analysis 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, effluent PFAS monitoring shall be
conducted using the approved EPA PFAS Method 1633. See Appendix A for list of analytes.
(b.) Effluent monitoring using the unapproved analytical method takes effect six (6) months after the
effective date of the permit (Month xx, 2024) and will be at a 2/year 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-postingpdf
HAS Monitoring using the January 2024 Method 1633 shall be reported 2/year 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.
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Permit NCO020117
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.
(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 finishing; 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 HAS discharges to the
Norman H. Larkins WPCF; and begin sampling of and modify Industrial User Permits (IUPs)
for each SIU identified as suspected of HAS discharges to the Norman H. Larkins WPCF to
ensure sampling begins within six months of the permit effective date, by Month xx, 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
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Permit NCO0201 17
industry categories expected or suspected of HAS 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 Norman H. Larkins WPCF 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 Norman H. Larkins WPCF 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. 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.(9.) ELECTRONIC REPORTING OF 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 Section supplements or supersedes the following sections within Part II of this permit (Standard
Conditions for NPDES Permits):
• Section B. (11.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
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
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit
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Permit NC0020117
DMRs electronically using the internet. Until such time that the state's eDMR application is compliant with
EPA's Cross -Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DEQ/DWR/Water Quality Permitting Section
Attn: Central Files
1617 Mail Service Center
Raleigh, NC 27699-1617
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 mailing address above. See "How to Request a Waiver from
Electronic Reporting" section below.
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, 2020, the permittee must electronically report the following compliance monitoring
data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• 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(l)(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
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Permit NC0020117
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 five (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:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Sienatory Requirements [Supplements Section B. (I1.) (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.
(I 1.)(a) or by a duly authorized representative of that person as described in Part 11, Section B. (I 1.)(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 offines and imprisonment for knowing violations. "
5. Records Retention [Supplements Section D. (6.)]
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 three (3) years from the date of the report. This
period may be extended by request of the Director at any time [40 CFR 122.4 1].
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DocuSign Envelope ID: 4215D173-0915-4AE8-A69B-3126F9DE9396
Permit NCO020117
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City of Clinton - NCO020117 Facility
Location
Receiving Stream: Williams Old Mill Branch Let: 35' 00' 15"
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River Basin: Cape Fear
8-digitHUC: 03030006 USGSQuad: North Clinton North Not to scale
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