NC0021491_Permit (Issuance)_20230118

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
NORTH CAROLINA
Environmental Quality
January 18, 2023
Town of Mocksville
Attn: Mr. Kenneth Gamble, Town Manager
171 S. Clement Street
Mocksville, North Carolina 27028
Email: kgamble e,mocksvillenc.gov
Subject: Final NPDES Permit Renewal
PermitNC0021491, 0.98 MG
Dutchman WWTP
Davie County
Grade III Biological WPCS
SIC Code 4952
Dear Permittee:
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).
The following significant changes were made to the draft permit sent to you on 10/27/2022
• Increased frequency of nutrient (Total Nitrogen and Total Phosphorous) effluent
monitoring from quarterly to monthly. Better monitoring is needed to develop the nutrient
strategy to protect High Rock Lake.
• Added instream monitoring for turbidity due to turbidity impairment in the watershed.
• Added instream monitoring for Total suspended solids (TSS). This parameter is used when
developing total maximum daily loads (TMDLs).
• Corrected the instream Temperature requirement: from daily to 3/week subject to variable
frequency per State WQ reporting requirements 15A NCAC 213 .0500 and Monitoring
Frequency criteria (MFC) for class III facilities.
• Added monthly instream monitoring requirements for facilities that impact nutrient
sensitive waters (NSW)/Nutrient sensitive watershed such as: Nitrate and Nitrate (NO2 +
NO3), Total Kjeldahl Nitrogen (TKN), Ammonia (NH3 as N), Total Nitrogen, Total
Phosphorous, and pH. This monitoring is needed to develop the nutrient strategy to protect
High Rock Lake. However, as a participant in the Yadkin Pee -Dee River Basin
Association (YPDRBA), instream monitoring is provisionally waived, except for
hardness. Instream monitoring will be immediately reinstated, and the Division shall be
notified immediately should the permittee end its participation in the Association.
• Corrected the effluent table to add monitoring for Zinc. Zinc quarterly monitoring is
requirement is maintained per reasonable potential analysis (RPA). Since the predicted
Max > 50% of Allowable Cw.

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
The final permit maintains the following significant changes identified in the letter sent to
you on 10/27/2022:
• The facility's components list has been updated.
• Monitoring frequency for total residual chlorine (TRC) has been revised to reflect a
Grade III facility. Monitoring frequency changed from twice to three times a week [See
Section A. (L)].
• To monitor the influence of the discharge on the receiving stream and in accordance with
15A NCAC 02B .0508, instream monitoring requirements for conductivity have been
added to the permit [See Section A. (L)].
• The Division is implementing dissolved metals standards in all permits, per the 2016
revisions to State water quality standards. As such, the NPDES Permitting Unit will need
site -specific effluent hardness data and instream hardness data upstream of the discharge
for each facility monitoring these metals to calculate permit limitations. Therefore,
effluent hardness and instream hardness sampling upstream of the discharge, have been
added to the permit at a monitoring frequency of quarterly [See Section A. (L)].
• Per the 2016 revisions to State water quality standards, the requirement for effluent and
upstream hardness sampling has been revised [See Footnotes 5 and 6 in Section A. (L)]
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to
violate state water quality standard for zinc, the monitoring requirement for zinc has been
removed from the permit [See Section A. (1.)].
• Based on the RPA continuing to show reasonable potential to violate state water quality
standard for cadmium, cadmium limits have been updated in the permit. Limitations
became more stringent. [See Section A. (1.)].
• Based on the RPA showing reasonable potential to violate state water quality standard for
copper, copper limits have been added to the permit [See Section A. (1.)].
To provide an opportunity for the Town to develop a plan to assess sources of copper to
come in compliance with the limit in Section A. (I.), a 3-year schedule of compliance has
been added to the permit [See Special Condition A. (6.) Schedule of Compliance for
Copper Limitations (with option for WER Study)].
• Based on the presence of a downstream Water Supply, a requirement to monitor effluent
1,4-Dioxane quarterly has been added to the permit [See Section A. (1.)]
• A permit reopener special condition has been added to modify 1,4-Dioxane monitoring,
treatment and/or compliance [See Special Condition A. (7.)].
• Based on the presence of a downstream Water Supply, Special Condition A. (8.) to monitor
effluent PFAS chemicals quarterly has been added to the permit [See Section A. (1.)] to be
effective six (6) months after EPA has a final wastewater method in 40 CFR 136 method
published in the Federal Register.
• Some of the wording has changed in Special Condition A. (3.). The specific three years in
which the Effluent Pollutant Scan shall be performed (2024, 2025, and 2026) were added.
Please review each paragraph carefully.
• Some of the wording has changed in Special Condition A. (4.). 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. Also, Federal
regulations require the 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)
Page 2 of 4

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
internet application has been added to your NPDES permit. Please review each paragraph
carefully.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
[ See A. (1.)].
• Regulatory citations have been added to the permit.
Pretreatment updates in response to NPDES permit renewal:
a) On July 17, 2023, 180 days after the effective date of this NPDES permit renewal, the
Town of Mocksville is required to submit to the Division a written technical evaluation of
the need to revise local limits (i.e., an updated HWA-AT/STMP, or documentation of why
is not needed). This action may include revising, updating, or adding to the list of
Significant Industrial Users (SIUs).
i) Submit the updated Short -Term Monitoring Plan (STMP)
(1) Review pollutants of concern (POCs) and update the STMP to reflect pollutants in
industrial user permits (IUPs).
(2) Update target Practical Quantification Level (PQLs)
ii) Submit the updated headwork analysis and allocation table (HWA-AT)
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.
The NPDES standard conditions (Parts II, III, and IV) 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 re -issuance 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 Diana Yitbarek at [phone]
or email at diana.yitbarek(cr�,ncdenr.gov.
Sincerely,
EAADoc''u,,Siwwgne''d byy:A `', h'q,'' `
C464531431644FE...
for Richard E. Rogers. Jr, Director
Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Ecopy: US EPA Region 4
WWTP's ORC/ Dennis W. Murdock
Envirolink Inc./ C. White and Madelyn Mills
DWR/Municipal Permitting Unit — Pretreatment (PT) /Keyes McGee
Page 3 of 4

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
DWR/Winston Salem Regional Office/Pretreatment/Tricia Lowery
DWR/Winston Salem Regional Office/ Lon Snider and Jenny Graznak
DWR/Operator Certification Program/Maureen Kinney
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Basin Planning/ Nora Deamer
DWR/Aquatic Toxicology Branch/ Cindy Moore
Page 4 of 4

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
FINAL PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions 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
Town of Mocksville
is hereby authorized to discharge wastewater from a facility located at the
Dutchman Creek Wastewater Treatment Plant
295 Garwood Road, Mocksville, NC
Davie County
to receiving waters designated as Dutchman Creek in the Yadkin -Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof.
The permit shall become effective March 1, 2023
This permit and the authorization to discharge shall expire at midnight on June 30, 2027.
Signed this day January 18, 2023
Y�VppDCo� cfurlS Aigne'd by:khV itk'l`
C464531431644FE... for
Richard E. Rogers, Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 12

DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NC0021491
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, 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 Town of Mocksville is hereby authorized to:
1. Continue to operate the existing 0.98 MGD wastewater treatment system that includes the
following components:
• Influent pump station
• Flow splitter box
• Flume
• Three (3) aeration basins
• Two (2) clarifiers
• Chlorine contact chamber
• RAS/ WAS pump station
• Aerobic digester
• Chlorine building
• Chemical building
• Sludge thickener
• Blowers
• Emergency generator
2. Discharge from said treatment works at the location specified on the attached map into
Dutchman Creek, classified C waters in the Yadkin -Pee Dee River Basin.
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DocuSign Envelope ID: 11AED56D-4BB4-4E9A-8684-F60927CB1B72
Permit NCO021491
PART
A. (1.) EFFLUENT AND INSTREAM LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq.,15A NCAC 02B .0500 et seq.]
Grade III Biological Water Pollution Control System [15A NCAC 08G .03021
a. During the period beginning on the effective date of the permit and lasting until permit expiration, the
Permittee is authorized to discharge from out -fall 001. Such discharges shall be limited and monitored'
by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
Parameter Codes
LIMITS
MONITORING
REQUIREMENTS
Monthly Average
Weekly
Average
Daily Maximum
Measurement
Frequency
Sample Type
Sample
Location
Flow
50050
0.98 MGD
Continuous
Recorded
I or E
BOD5 20 °C 3
(April 1 - October 30
Co" 0
5.0 mg/L
7.5 mg/L
3Meek
Composite
1, E
BOD5 20 °C 3
November 1 - March 31
10.0 mg/L
15.0 mg/L
3Meek
Composite
I, E
Total Suspended Solids 3
C0530
30.0 m /L
45.0 m /L
3Meek
Composite
1, E
Total Suspended Solids
C0530
Monitor & Report, m /L
Monthly
Composite
U, D
Temperature
00010
Monitor and Report, °C
Daily
Grab
E
Temperature 1
00010
Monitor and Report, °C
3Meek
Grab
U, D
Dissolved Oxygen DO 4 ,
00300
Footnote 4
3Meek
Grab
E, U, D
Conductivity '
00094
Monitor and Report, mhos/cm
3Meek
Grab
E, U, D
Total Nitrogen
NO2 + NO3 + TKN
C0600
Monitor and Report, mg/L
Monthly
Composite
E, U, D
Total Phosphorus
C0665
Monitor and Report, m /L
Monthly
Composite
E, U, D
NO2 + NO3
00630
Monitor & Report, m /L
Monthly
Composite
E, U, D
TKN
00625
Monitor & Report, m /L
Monthly
Composite
E, U, D
NH3 as N
(April 1- October 30
00630
2.0 mg/L
6.0 mg/L
3Meek
Composite
E
NH3 as N
November 1 -March 31
4.0 mg/L
12.0 mg/L
3Meek
Composite
E
NH3 as N
00630
Monitor & Re ort, m /L
MonthlyComposite
U, D
Fecal Coliform
31616
200 / 100 ml 400 / 100 ml I
3Meek
Grab
E
H
00400
6.0 - 9.0 standard units
3Meek
Grab
E
H
00400
Monitor & Report, standard units
3Meek
Grab
U, D
Turbidity
00070
Monitor and Report, NTU
Monthly
Grab
E, U, D
Hardness -Total as
CaCO3 or Ca + M s
00900
Monitor &Reortm
p, g/L
Quarterly
Composite
E
Hardness -Total as
CaCO3 or Ca + M 6
Grab
U
Total Residual Chlorine 7
50060
28 /l
3Meek
Grab
E
Cadmium
01027
1.8 /l
9.4 /l
Monthly
Composite
E
Copper8
01042
25.04 /l
31.04 /l
Monthly
Composite
E
Nickel
01067
Monitor and Report, /L
Quarterly
Composite
E
Zinc
01092
Monitor and Report, /L
Quarterly
Composite
E
1,4-Dioxane s
82388
Monitor and Report, /L
Quarterly
Grab
E
PFAS 10
Various
Footnote 10
Quarterly
Grab
E
Silver
01077
Monitor and Report
Monthly
Composite
E
Chronic Toxicity 11
TGP3B
Footnote 11
Quarterly
Composite
E
Effluent Pollutant Scan 12
NC01
Monitor and Report
Footnote 12
E
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Special Condition A. (4).
2. I= Influent. E= Effluent. U= Upstream approximately 100 feet upstream from the outfall. D= Downstream approximately
0.5 miles downstream from the outfall.
(+) Variable frequency: Upstream and downstream samples shall be grab samples collected 3/week during June, July,
August, and September and once per week during the rest of the year. As a participant in the Yadkin Pee -Dee River
Basin Association (YPDRBA), instream monitoring is provisionally waived, except for hardness. Instream monitoring will
be immediately reinstated, and the Division shall be notified immediately should the permittee end its participation in the
Association.
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 percent of the
respective influent value (85% removal).
4. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/L from April 1 to October 31, and
no less than 5.0 mg/L from November 1 to March 31.
5. Effluent hardness sampling should be performed in conjunction with testing for hardness -dependent metals (cadmium,
copper, lead, nickel, silver, and zinc).
6. The Permittee shall sample instream hardness, upstream of the facility's discharge. The sample shall be representative of
the hardness in the receiving stream.
7. The Division shall consider all effluent total residual chlorine values reported below 50 µg/1 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/1.
8. 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. (6). Starting on the effective date of this
permit, the Permittee shall perform monthly effluent Monitoring and Reporting for Total Copper
9. 1,4 Dioxane samples shall be analyzed and reported using sufficiently sensitive test Methods approved under 40 CFR part
136 for the analysis of pollutants or pollutant parameters (i.e., Method 40 CFR 624.1. with a PQL < 1 µg/L). See Reopener
Special Condition A. (7.).
10. The Permittee shall follow the quarterly PFAS effluent monitoring requirement with delayed implementation detailed in
Special Condition A. (8.).
11. Chronic Toxicity (Ceriodaphnia) at 370/o: January, April, July, and October (see condition A. (2.)).
12. The permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A. (3)].
There shall be no discharge of floating solids or visible foam other than trace amounts.
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
A. (2.) QUARTERLY CHRONIC TOXICITY PERMIT LIMIT
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 37%.
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.
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 on the Effluent Discharge
Monitoring Form (MR-1) for the months in which tests were performed, using the parameter code TGP313 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:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
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.
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
A. (3.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[G.S.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: 2024, 2025, and 2026. 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.
(5.) and
A. (6.), depending on the
outfall used),
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)
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 (PQL
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 organic 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
(b.) Effluent Scan Reporting.
Test results shall be reported electronically via eDMR by December 31st 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
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NC0021491
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 maybe uploaded at: https://edocs.deg.nc.gov/Forms/NPDES WW-EDMR-Supplemental-Form
(c.) 2nd-Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in A. (5.) and A. (6.), depending on the outfall used, 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 (tox condition title); 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 sample 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, ATForms.ATB@ncdenr.
(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.
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
A. (4) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
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 [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 monthly 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 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.
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;
-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).
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NC0021491
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:
has://www.federalre aister.gov/documents/20l5/l O/22/2015-24954/national-pollutant-discharae-
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 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:
hLtp:Hdeg.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:
hLtp:Hdeg.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 122.221. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
"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.)]
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 122.411.
A. (5.) NUTRIENT REOPENER FOR HIGH ROCK LAKE
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. (6.) SCHEDULE OF COMPLIANCE FOR TOTAL COPPER LIMITATIONS (with
option for WER STUDY) [NCGS 143-215.1 (b)]
(a.) 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. (1). This plan will include
specific dates for completion or implementation of each action.
(b.) 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.
(c.) The Permittee shall achieve compliance with Total Copper limitations specified in Section A. (1.) within
three (3) years of the effective date of the permit.
(d) 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.
(e) 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 limit.
(f) If the Permittee wishes to conduct a WER study to develop site -specific Total Copper limitations, 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.
(g) 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.
(h.) If the WER study results in site -specific Total Copper limits 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.
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
(i.) The final total copper 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.
(j) 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 above.
(k) Alternatively, the Permittee may request this Schedule of Compliance be removed, and the copper
limitations specified in Section A. (1.) be placed into effect.
(1.) 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:
(1) NCDEQ / Division of Water Resources NPDES Municipal
Permitting Unit 1617 Mail Service Center Raleigh, NC 27699-1617
(2) NCDEQ / Division of Water Resources Winston-Salem Regional
Office 450 West Hanes Mill Road Winston-Salem, NC 27105
A. (7.) 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. (8.) PFAS MONITORING REQUIREMENT [NCGS 143-215.1(b)]
This reporting requirement for the per- and polyfluoroalkyl substances (PFAS) parameters listed under Table
1 of the Final Method 1633 takes effect the first full calendar quarter following six (6) months after EPA
publishes a 40 CFR part 136 Final PFAS Method for wastewater in the Federal Register. Monitoring will be at
a quarterly frequency.
Find the current parameters listed under Table 1 of the August 2021 Draft Method 1633 Analysis of Per- and
Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS
at: https://www.epa.gov/system/files/documents/2021-09/method_1633_draft_aug-2021.pdf
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DocuSign Envelope ID: 11 AED56D-4BB4-4E9A-8684-F60927CB1 B72
Permit NCO021491
Facility Location
Town of Mocksville - NCO021491
USGS Quad Number: D 16 NE
Receiving Stream: Dutchman Creek
Stream Class: C
Subbasin: Yadkin 03-07-05
Outfall location: Lat.: 35' 53' 33" N Long.: 80' 30' 07" W