NC0050342_Draft Permit_20230801

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Ms. Courtney Driver, P.E.
Director of Utilities
City of Winston-Salem
PO Box 2511
Winston-Salem, North Carolina 27102
Dear Ms. Driven:
NORTH CAROLINA
Environmental Quality
August 1, 2023
Subject: Draft NPDES Permit Renewal
Permit NCO050342
Muddy Creek WWTP
Forsyth 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:
• The facility components list was revised from communication with facility staff [See Supplement to
Cover Sheet].
• To better understand nitrogen pollution characteristics, Total Kjeldahl Nitrogen (TKN) and Nitrate -
Nitrite (NO3+NO2) monthly monitoring have been added to the permit at both outfalls [See A. (1.) and
A. (2)].
• Based on evaluation of effluent and instream data at the Permittee's request, effluent Conductivity
monitoring frequency at Outfall 001 has been reduced to monthly to match that monitored instream by
the Yadkin -Pee Dee River Basin Association (YPDRBA) [See A. (1)].
• Based on NPDES guidance regarding the reduction of monitoring frequencies in NPDES permits for
exceptionally performing facilities, an evaluation of effluent CBOD data at Outfall 001 resulted in not
meeting numeric criteria. Monitoring frequency for CBOD at Outfall 001 has been increased to daily
[See A. (1)].
• Based on NPDES guidance regarding the reduction of monitoring frequencies in NPDES permits for
exceptionally performing facilities, an evaluation of effluent NH3-N, Total Suspended Solids and Fecal
Coliform at Outfall 001 has resulted in meeting numeric criteria. Monitoring frequencies for NH3-N,
Total Suspended Solids and Fecal Coliform at Outfall 001 are maintained at 2/week [See A. (1)].
• Instream monitoring requirements have been moved to a separate condition [See A. (3.)].
• Some of the wording has changed in Special Condition A. (4.), Chronic Toxicity Permit Limit, please
review each paragraph carefully.
• Some of the wording has changed in Special Condition A. (5.), including the specific three years in
which the Effluent Pollutant Scan shall be performed (2025, 2026, and 2027), please review each
paragraph carefully.
D E Q North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
o PanmemA i Envi omen u� /� 919.707.9000

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
• Based on Mercury TMDL evaluation showing mercury values reported at levels > 1 ng/L and since the
permitted flow is greater than 2 MGD, the language in the Mercury Minimization Plan has been revised
toward its maintenance [See A. (7)].
• Based on the potential of 1,4-Dioxane passing through the WWTP system from certain industrial user
types including metal finishers, monthly monitoring for 1,4-Dioxane at Outfall 001 as well as a 1,4-
Dioxane reopener condition have been added to the permit [See A. (1.) and Special Condition A. (9)].
• A special condition to monitor effluent PFAS chemicals quarterly at Outfall 001 has been added to the
permit, to be effective six (6) months after EPA has a final wastewater method in 40 CFR136 method
published in the Federal Register to allow for laboratories become NC -certified in the new method
[See Special Condition A. (10.) PFAS Monitoring Requirements].
• Clarifying language was added to the effluent sheet for Outfall 002 [See A. (2)].
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.
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Forsyth 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,
E DocuSigned by:
MMWIN
9FBBBC952DF8455...
Gary Perlmutter, Environmental Specialist II
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR/Winston-Salem Regional Office/Water Quality/Lon Snider and Jenny Graznak
DWR/Operator Certification Program/Maureen Kinney
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Cindy Moore and Molly Nicholson
DWR/Municipal Permitting Unit/Keyes McGee
DWR/Public Water Supply/Eric Hudson
City of Winston-Salem / Ozie Keith Jones (ORC)
D E Q ,�J North Carolina Department of Environmental Quality I Division of Water Resources
v 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
NORTH C of Envl A 919.707.9000
oepnnmem m �mroo��vi a�si�

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
N( PDES)
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
City of Winston-Salem
is hereby authorized to discharge wastewater from a facility located at the
Muddy Creek Wastewater Treatment Plant
4561 Cooper Road
Winston-Salem, North Carolina 27127
Forsyth County
to receiving waters designated as the Yadkin River (Outfall 001) and Muddy Creek (Outfall 002) in the
Yadkin -Pee Dee River Basin in accordance with the effluent limitations, monitoring requirements, and
other applicable conditions set forth in Parts I,11,11I, and IV hereof.
This permit shall become effective on Month 01, 2023.
This permit and authorization to discharge shall expire at midnight on June 30, 2028.
Signed this day Month xx, 2023.
DRAFT
for Richard E. Rogers, Jr., Director
Division of Water Resources
By Authority of the Environmental Management
Commission

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
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.
City of Winston-Salem
is hereby authorized to:
1. Continue to operate and maintain the wastewater treatment works identified on the Cover, an existing
21.0 MGD facility consisting of the following components:
• Bar Screens
• Grit Chambers
• Primary clarification
• Three (3) aeration basins with fine bubble diffusers
• Hydrated lime silo
• Five (5) secondary clarifiers
• Chlorination & dechlorination
• Instrumented flow measurement
• Four (4) anaerobic sludge digesters
• Gravity thickener
• One (1) centrate storage lagoon
• Two (2) stormwater overflow basins
• Carbon pellet odor scrubber
• Three (3) emergency generators
• Effluent / flood control pump station
• Equalization tanks / day tanks
2. Discharge from said treatment works at the location specified on the attached map via Outfall 001 into
the Yadkin River classified WS-IV waters and via Outfall 002 (effluent overflow) into the Muddy
Creek classified C waters; both outfalls are in the Yadkin -Pee Dee River Basin and 03040101 HUC.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
PART
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (OUTFALL 001)
[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:
PARAMETER
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
50050
21.0 MGD
Continuous
Recording
I or E
CBOD, 5-day, 20°C3
80082
25.0 mg/L
40.0 mg/L
Daily
Composite
I and E
Total Suspended Solids 3
C0530
30.0 mg/L
45.0 mg/L
2/week 4
Composite
I and E
NH3-N (Apr 1 - Oct 31)
C0610
14.0 mg/L
35.0 mg/L
2/week4
Composite
E
NH3-N (Nov 1 - Mar 31), mg/L
C0610
Monitor and Report
2/week4
Composite
E
Dissolved Oxygen
00300
Daily Average > 5.0 mg/L
Daily
Grab
E
Fecal Coliform (geometric mean)
31616
200/100 mL
400/100 mL
I
2/week4
Grab
E
Total Residual Chlorine'
50060
1 28 µg/L
Daily
Grab
E
TKN 6, mg/L
00625
Monitor and Report
Monthly
Composite
E
NO3-N + NO2-N 6, mg/L
00630
Monitor and Report
Monthly
Composite
E
Total Nitrogen6, mg/L
C0600
Monitor and Report
Monthly
Calculated
E
Total Phosphorus, mg/L
C0665
Monitor and Report
Monthly
Composite
E
Temperature, °C
00010
Monitor and Report
Daily
Grab
E
Conductivity, µmhos/cm
00094
Monitor and Report
Daily
Grab
E
PH
00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
E
Total Hardness ' (as CaCO3)1
mg/L
00900
Monitor and Report
Quarterly
Composite
E
1,4-Dioxane 8, µg/L
82388
Monitor and Report
Monthly
Composite
E
PFAS, ng/L
various
Footnote 9
Quarterly
Grab
E
Chronic Toxicity 10
TGP3B
Monitor and Report
Quarterly
Composite
E
Pollutant Scan
NCO]
Monitor and Report
Footnote 11
Footnote 11
E
Footnotes:
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (11.).
2. I = influent; E = effluent at the parshall flume immediately below the chlorine injection point.
3. The monthly average effluent C130135 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
4. Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. 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.
6. 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.
7. Effluent hardness shall be performed in conjunction with testing for hardness dependent metals (cadmium,
copper, lead, nickel, silver, and zinc).
Footnotes continue on the next page.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
Footnotes (continued)
8. 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 or 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 monthly to quarterly.
9. Follow Special Condition A. (10.).
10. Chronic Toxicity (Ceriodaphnia dubia) Pass/Fail at 5.5% effluent with testing in January, April, July and October.
See Special Condition A. (4.).
11. The Permittee shall perform three effluent pollution scans during the term of this permit. See Special Condition
A. (5.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (OUTFALL 002)
[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 002
(WWTP Effluent Overflow) during emergency rain events when Outfall 001 is inoperable due to
flooding. Such discharges shall be limited and monitored' by the Permittee as specified below:
PARAMETER
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS 2
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location 3
Flow
50050
Monitor and Report
Continuous
Recording
I or E
CBOD, 5-day, 20°C 5
80082
25.0 mg/L
40.0 mg/L
Daily
Composite
I and E
Total Suspended Solids 5
C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
N113-N (Apr 1 - Oct 31)
C0610
14.0 mg/L
35.0 mg/L
Daily
Composite
E
NH3-N (Nov 1 - Mar 31), mg/L
C0610
Monitor and Report
Daily
Composite
Daily
Dissolved Oxygen
00300
Daily Average > 5.0 mg/L
Daily
Grab
Daily
Fecal Colifonn (geometric mean)
31616
200/100 mL I 400/100 mL I
Daily
Grab
E 4
Total Residual Chlorine
50060
Monitor and Report
Daily
Grab
E 4
TKN 6, mg/L
00625
Monitor and Report
Monthly
Composite
E
NO3-N + NO2-N 6, mg/L
00630
Monitor and Report
Monthly
Composite
E
Total Nitrogen 6, mg/L
C0600
Monitor and Report
Monthly
Calculated
E
Total Phosphorus, mg/L
C0665
Monitor and Report
Monthly
Composite
E
Temperature, °C
00010
Monitor and Report
Daily
Grab
E
Conductivity, µmhos/cm
00094
Monitor and Report
Daily
Grab
E 4
pH
00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
E 4
Footnotes.
1. The Permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application
system. See Special Condition A. (11.).
2. Monitoring is exempted during unsafe conditions. See Special Condition A. (6.).
3. I = influent; E = effluent at the parshall flume immediately below the chlorine injection point unless specified.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
Footnotes (continued)
4. Effluent samples shall be taken after dechlorination at the Frye Bridge mixing vault, prior to entering the
remaining outfall line.
5. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
6. 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.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Secondary outfall (Outfall 002) discharges into Muddy Creek for emergency use during severe flooding events.
The NCDEO Winston-Salem Regional Office shall be notified immediately (within 24-hours) upon activation
of Outfall 002. Any information shall be provided orally within 24 hours from the time the Permittee became
aware of the circumstances.
A.(3.) INSTREAM M ONITORING 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
LOCATION'
Jun 1— Sep 30
Oct 1— May 31
Total
(mg/L) Hardness (as CaCO3)
00900
Surface
Quarterly
Upstream
CBOD, 5-day (mg/L)
80082
Surface
3/week
Weekly
Upstream,
Downstream
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
Fecal Coliform (#/100 mL)
31616
Surface
3/week
Weekly
Upstream,
Downstream
Footnotes:
1. Upstream is located in the Yadkin River at Idols Dam; downstream is located at 0.26 miles below US Highway
64. Instream monitoring for CBOD, Temperature, DO, Conductivity and Fecal Coliform is provisionally waived
considering the Permittee's participation in the Yadkin -Pee Dee River Basin Association. Instream monitoring
shall be immediately reinstated, and the Division shall be notified immediately should the Permittee end its
participation in the Association.
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. If the Permittee is a member of a Monitoring Coalition
Program, sampling for instream hardness may be waived if the Monitoring Coalition agrees to sample hardness
at the nearest upstream location, at a minimum frequency of quarterly, and the Permittee has obtained approval
from DWR — NPDES Permitting Unit that the upstream station being monitored by the Coalition is representative
of the receiving stream for this discharge. The Permittee is responsible for submitting instream hardness test
results with its permit renewal application package. If Coalition membership is cancelled or the Coalition
terminates instream hardness sampling at the approved station, the Permittee will immediately notify the Division
and resume sampling for instream hardness, upstream of its discharge.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
A.(4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B .0200; 15A NCAC 02B .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 5.5% at Outfall 001.
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 11 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 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:
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.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NC0050342
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.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
A.(5.) 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: 2025, 2026, and
2027. 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.
(4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)) 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
009001,1,2,2-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
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-tichlorobenzene
C0551
1,1-dichloroethane
34496
Benzo(k)fluoranthene
34242
1,2-dichloroethane
32103
Bis (2-chloroethoxy) methane
34278

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NC0050342
(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 NCO 1 - 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:Hedocs.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. (4.) CHRONIC TOXICITY
PERMIT LIMIT (QUARTERLY), 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
A. (4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY); 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.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
A. (6.) POTENTIAL INSTREAM SAMPLING EXEMPTION [15A NCAC 0213.0500 et seq.]
Per 15A NCAC 2B .0505(c)(4), stream sampling (as well as influent/effluent sampling) may be
discontinued when flow conditions could result in injury or death of the person(s) collecting the samples.
In such cases, on each day that sampling is discontinued, written justification shall be specified in the
monitoring report for the month in which the event occurred. This provision shall be strictly construed and
may not be utilized to avoid the requirements of this Section when performance of these requirements is
attainable. When there is discontinuance pursuant to this provision, stream (as well as influent/effluent
sampling) shall be resumed at the first opportunity after the risk period has ceased.
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.
A. (8.) 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. (9.) 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.

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NCO050342
A. (10.) 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 to allow time
for laboratories to become NC -certified in the new method. Monitoring will be at a quarterly frequency.
Find the current parameters listed under Table 1 of the 3rd Draft Method 1633 Analysis of Per- and
Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS at:
htips://www.gpa.gov/system/files/documents/2022-
12/3rd%20Draft%20Method%201633%20December%202022%2012-20-22_508.pdf
A.(11.) 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)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 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

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NC0050342
See "How to Request a Waiver from Electronic Reporting" section below.
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 EPXs 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 EPXs NPDES Electronic Reporting
Rule is found at: https://www.federalre ig s��aov/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:

DocuSign Envelope ID: FE243A5F-A673-4039-8F1F-A86867554096
Permit NC0050342
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 11, 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:
htlp://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.)]
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 may be extended by request of the Director at any time [40 CFR 122.4 1].

DocuSign Envelope ID: FE243A5F-A673-4039-8F1 F-A86867554096
Permit NCO050342
n
@I
WWTP
Outfall 002
' (overflow)
-
•��'
1. ...�
�
_ - ♦ 1
f
IVA
Outfall 001
NC0050 342 — Muddy Creek VVVVTP
Facility X
Facilih' Outfa11001 Outfall002
Latitude: 35°59'49"N 35°55'531,N 35°58'36"N
Location
Longitude: 80`1915811R% 80°22'0811 80`20'20"W
Receiving Stream: Yadkin River Muddy Creek
Stream Class: NN's-R' C
tiSGS Quad.: Welcome, NC
Y}�
North
City of Winston-Salem
Ricer Basin: Yadkin -Pee Dee 8-digit HUC 3040101
f �j I L
Fn rsyth Cou my