NC0050342_permit issuance_20170728

ROY COOPER
Gover„or
Water Resources
ENVIRONMENTAL QUALITY
MICHAEL S. REGAN
Secretary
S. JAY ZIMMERMAN
July 28, 2017
Ms. Courtney Driver
City of Winston-Salem
P.O. Box 2511
Winston-Salem, NC 27102-2511
Subject: Final NPDES Permit Renewal
Permit NC0050342
Muddy Creek WWTP
Forsyth County
Class IV Facility
SIC code 4952
Dear Ms. Driver:
Director
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 addition was made to the final permit and was not in the draft permit sent to you on
November 30, 2016:
• Effluent data reported for silver was all less than detection at a detection level of less than
5 µg/L or 2 µg/L. In accordance with 15A NCAC 2B. 0500 all test procedures must
produce detection and reporting levels that are below the permit discharge requirements.
All data generated must be reported to the approved detection level or lower reporting
level of the procedure. Currently, DWR's laboratory identifies the Practical Quantitation
Level (PQL) for silver at < 1 µg/L. The allowable discharge concentration for your
facility is 1.081 µg/L. Therefore, future sampling for silver as part of the facility's
Pretreatment Program and Effluent Pollutant Scan should sample silver down to the
lower reporting level of the procedure which is < 1 µg/L. No limits or additional
monitoring requirements for silver were added to the permit at this time.
• The expiration date has been extended from June 30, 2019 to June 30, 2022.
• The years identified for the Effluent Pollutant Scan in A. (4) have changed from 2017,
2018, and 2019 to 2017, 2019, ad 2021 due to the permit expiration change to June 30,
2022. Section A. (4) has been updated to the current version.
• The measurement frequency and sample type for the Effluent Pollutant Scan in Section
A. (1) have changed in format to direct you to footnote 9.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center 1 Raleigh, North Carolina 27699-1617
919 807 6300

Page 12
• The Effluent Pollutant Scan has been updated to include the text "Monitor and Report" in
Section A. (1).
• Section A. (1) footnotes 5 and 6 have been updated to reflect the location of effluent
sampling identified in the permit renewal application. The footnote `Effluent samples
shall be taken prior to entering the 5 mile outfall line' has been removed since those
parameters are sampled at the parshall flume immediately below the chlorine injection
point [see A. (1) footnote 5].
• The mercury minimization plan (MMP) in Section A. (6) shall be developed by February
28, 2018 and the condition has been updated to reflect that date and the current website
link.
• Required units of measurement have been included for all parameters in Section A. (1)
and A. (2).
• The parameter codes for Total Phosphorus and CBOD5 have been corrected.
• Footnote 2 in Section A. (1) has been simplified regarding twice per week monitoring for
select parameters.
• Footnote 1 in Section A. (1) and A. (2) has been updated since the December 21, 2016
eDMR deadline has passed.
• Footnotes in Section A. (2) have been updated to reflect the correct effluent sampling
locations.
• The monitoring frequency for Total Nitrogen and Total Phosphorus in Section A. (1) and
A. (2) has changed from weekly to monthly per 15A NCAC 2B .0500. Weekly samples
are no longer needed for the Yadkin Pee -Dee River Basin nutrient management strategy.
This final permit contains the following changes from your previous permit:
• The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the
NC Environmental Management Committee (EMC) on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6, 2016 with some exceptions. The NC
Division of Water Resources NPDES Permitting Unit is required to implement the new
dissolved metal standards in all permits public noticed after April 6, 2016. The new
standards for most metals include acute standards. Further, the freshwater standards for
several metals are expressed as the dissolved form of the metals, and seven metals have
hardness -dependent equations. As a result, 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 in order to calculate permit limitations. Effluent
hardness and instream hardness sampling, upstream of the discharge, has been added to
this permit at a monitoring frequency of quarterly. See Section A. (1) Effluent Limitations
and Monitoring Requirements [footnote 10].
• The components list has been updated to include centrate storage lagoon instead of sludge
storage lagoon and the belt filter press has been removed.
• Effluent Pollutant Scan frequency has changed from annual to 3 times per permit cycle
[see A. (4)].
• Reduction in monitoring frequency from daily to twice per week has been included for the
influent and effluent parameters CBOD5, TSS, fecal coliform and ammonia nitrogen at

Page 13
outfall 001 based on exceptional facility performance over the past three years [15A NCAC
2B .0508(b)(1)].
• The limits and monitoring of mercury have been removed from A. (1) Effluent
Limitations and Monitoring Requirements based on the TMDL evaluation. Sampling for
mercury will be conducted during the 3 effluent pollutant scans [see A. (4)].
• Section A. (6) has been added to require a Mercury Minimization Plan (MMP) based on
the statewide mercury TMDL approved by EPA in 2012.
• Section A. (7) has been added to include a nutrient reopener for High Rock Lake.
• Regulatory citations have been added to the permit.
• Parameter characteristic codes have been added in Section A. (1) and A. (2).
• An outfall map has been included with updated Outfall 002 coordinates for the overflow
discharge located at the Frye Bridge dechlorination facility.
• The total residual chlorine limit is expressed as a daily maximum instead of a daily average.
• Please note that sampling for hardness dependent metals conducted for your LTMP should
be taken in conjunction with hardness sampling outlined in Section A. (1) for outfall 001
at least quarterly.
• 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. The requirement to begin reporting
discharge monitoring data electronically using the NC DWR's Electronic Discharge
Monitoring Report (eDMR) internet application has been added to your final NPDES
permit [see Special Condition A. (8)].
For information on eDMR, registering for eDMR and obtaining an eDMR user account,
please visit the following web page: htlp://deq.nc.gov/about/divisions/water-
resources/edmr.
For more information on EPA's final NPDES Electronic Reporting Rule, please visit the
following web site: https://www.federalregister.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule.
This discharge ultimately flows to High Rock Lake which is listed as impaired on the 2014
303(d) list for chlorophyll -a due to excessive nutrient inputs. Development of a nutrient
response model has been completed, but due to the nutrient criteria development process,
application of the model to determine appropriate reductions is on hold. Once the nutrient
criteria development process is completed for High Rock Lake, DWR will move forward with
the stakeholder process to develop a nutrient management strategy (and/or a TMDL). This
permit may be reopened and modified to implement the nutrient management strategy/TMDL
requirements.
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

Page 14
Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect
the legal requirements to obtain other permits which may be required by the Division of Water
Resources or any other Federal, State, or Local governmental permits that may be required.
If you have any questions concerning this permit, please contact Jennifer Busam at [phone]
or via email at [e-mail].
Sincerely,
Jay Zimme?n{ar , P.G.
irector, Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
Central Files
DWR/Winston-Salem Regional Office / Water Quality
DWR/PERCS/Deborah Gore
Ecopy: US EPA Region 4
DWR/Ecosystems Branch/Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/Winston-Salem Regional Office/ Public Water Supply
City of Winston-Salem/Mr. Frank Crump

Permit NC0050342
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 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
Forsyth County
to receiving waters designated as Yadkin River (outfall 001) and Muddy Creek (outfall 002) 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.
This permit shall become effective September 1, 2017.
This permit and authorization to discharge shall expire at midnight on June 30, 2022.
Signed this day July 28, 2017.
S. , a, Zimmerm
ctor, Division of Water Resources
y Authority of the Environmental Management Commission
Page 1 of 12

Permit NC0050342
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as
of this 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 Winston-Salem
is hereby authorized to:
1. Continue to operate an existing 21.0 MGD wastewater treatment facility that includes the following
components:
• Bar Screens
• Grit Chambers
• Primary clarification
• Three aeration basins with fine bubble diffusers
• Hydrated lime silo
• Secondary clarification
• Chlorination & dechlorination
• Instrumented flow measurement
• Anaerobic sludge digesters
• Gravity thickener
• Centrate storage lagoons
• Carbon pellet odor scrubber
• Two emergency generators
• Effluent/ flood control pump station
• Solids blending tanks
The facility is located at the Muddy Creek WWTP off Cooper Road in Winston-Salem, Forsyth
County.
2. Discharge from said treatment works at the location specified on the attached map into Yadkin River
(outfall 001) and Muddy Creek (outfall 002), currently classified WS-IV waters in the Yadkin -Pee
Dee River Basin.
Page 2 of 12

Permit NC0050342
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (OUTFALL 001)
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from outfall 001. Such discharges shall be limited and monitored' by the
Permittee as specified below:
PARAMETER CHARACTERISTICS
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location 5
Flow 50050
21.0 MGD
Continuous
Recording
Influent or Effluent
CBOD, 5-day, (20°C) 3 80082
25.0 mg/L
40.0 mglL
2NVeek 2
Composite
Influent and Effluent
CBOD, 5-day, (20°C) (mg/L) 80082
Variable 4
Grab
Upstream and
Downstream
Total Suspended Solids 3 C0530
30.0 mg/L
45.0 mg/L
2lweek 2
Composite
Influent and Effluent
NH3-N — *Summer C0610
14.0 mg/L
35.0 mg/L
2NVeek 2
Composite
Effluent
NH3-N (mg/L) — *Winter C0610
2NVeek 2
Composite
Effluent
NH3-N (mg/L) C0610
Variable4
Grab
Upstream and
Downstream
Dissolved Oxygen 00300
Daily Average > 5.0 mg/L
Daily
Grab
Effluent
Dissolved Oxygen (mg/L) 00300
Variable 4
Grab
Upstream and
Downstream
Fecal Coliform 31616
(geometric mean)
200/100 mL
400/100 mL
2NVeek 2
Grab
Effluent 6
Fecal Coliform
(geometric mean) (#/100mL) 31616
Variable 4
Grab
Upstream and
Downstream 4
Total Residual Chlorine 7 50060
28 pg/L
Daily
Grab
Effluent 6
Total Nitrogen C0600
(NO2+NO3+TKN) (mg/L)
Monthly
Composite
Effluent
Total Phosphorus (mg/L) C0665
Monthly
Composite
Effluent
Temperature (°C) 00010
Daily
Grab
Effluent
Temperature (°C) 00010
Variable 4
Grab
Upstream and
Downstream
Conductivity (pmhos/cm) 00094
Daily
Grab
Effluent 6
Conductivity (pmhos/cm) 00094
Variable 4
Grab
Upstream and
Downstream
Chronic Toxicity 8 TGP3B
Quarterly
Composite
Effluent 6
pH 00400
Between 6.0 and 9.0 standard units
Daily
Grab
Effluent 6
Effluent Pollutant Scan NC01
Monitor and Report
Footnote 9
Footnote 9
Effluent 6
Hardness- Total as [CaCO3 00900
or (Ca + Mg)] (mg/L)
Quarterly
Composite
Effluent 6
Hardness- Total as [CaCO3 00900
or (Ca + Mg)] (mg/L)
Quarterly
Grab
Upstream 4,10
*Summer. April 1- October 31
*Winter: November 1 — March 31
Page 3 of 12

Permit NC0050342
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see A. (8)].
2. Twice per week monitoring for CBOD5 and TSS for influent and effluent samples and effluent
samples for fecal coliform and NH3-N must occur on any two non-consecutive days during the
calendar week (Sunday through Saturday).
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85%) removal.
4. The upstream sampling location is at Idols Dam. Downstream sampling shall be conducted 0.26
miles below U.S. Highway 64. Instream sampling requirements are provisionally waived in light of
the permittee's participation in the Yadkin -Pee Dee River Basin Association. Should participation in
the association cease, all instream sampling requirements are immediately reinstated. Should
instream sampling be reinstated, grab samples shall be collected 3/week during the months of June,
July, August, and September, and weekly for the remainder of the year.
5. All effluent sampling is established at the parshall flume immediately below the chlorine injection
point unless specified.
6. Effluent samples shall be taken after dechlorination at the Frye Bridge mixing vault, prior to entering
the remaining outfall line.
7. 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.
8. Whole effluent toxicity will be evaluated using Chronic Toxicity (Ceriodaphnia) P/F test at 5.5%
during the months of January, April, July and October. See Section A. (3).
9. The permittee shall preform three Effluent Pollutant Scans during the term of this permit [see A. (4)].
10. The permittee shall sample instream 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 as long as 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.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS.
Page 4of12

Permit NC0050342
A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (OUTFALL 002)
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from outfall 002 (WWTP Effluent Overflow). Such discharges shall be limited
and monitored' by the Permittee as specified below:
PARAMETER CHARACTERISTICS
Parameter Code
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location 2
Flow (MGD) 50050
Continuous
Recording
Influent or
Effluent
CBOD, 5-day, (20°C) 4 80082
25.0 mg/L
40.0 mg/L
Daily
Grab
Influent and
Effluent
Total Suspended Solids 4 C0530
30.0 mg/L
45.0 mg/L
Daily
Grab
Influent and
Effluent
NH3-N — *Summer C0610
14.0 mg/L
35.0 mg/L
Daily
Grab
Effluent
NH3-N (mg/L) — *Winter C0610
Daily
Grab
Effluent
Dissolved Oxygen 00300
Daily Average > 5.0 mg/L
Daily
Grab
Effluent
Fecal Coliform 31616
(geometric mean)
200/100 mL
400/100 mL
Daily
Grab
Effluent 3
Total Residual Chlorine (pg/L) 50060
Daily
Grab
Effluent 3
Total Nitrogen (mg/L) C0600
(NO2+NO3+TKN)
Monthly
Grab
Effluent
Total Phosphorus (mg/L) C0665
Monthly
Grab
Effluent
Temperature (°C) 00010
Daily
Grab
Effluent
Conductivity (pmhos/cm) 00094
Daily
Grab
Effluent 3
pH 00400
Between 6.0 and 9.0 standard units
Daily
Grab
Effluent 3
*Summer: April 1- October 31
*Winter: November 1 — March 31
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system [see A. (8)].
2. All effluent sampling is established at the parshall flume immediately below the chlorine injection
point unless specified.
3. Effluent samples shall be taken after dechlorination at the Frye Bridge mixing vault, prior to entering
the remaining outfall line.
4. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85%) removal.
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER
THAN TRACE AMOUNTS.
The NCDEO Winston-Salem Regional Office shall be notified immediately upon activation of
outfall 002.
Page 5 of 12

Permit NC0050342
A. (3) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200 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%.
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 TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3
(original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 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
Page 6 of 12

Permit NC0050342
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.
A. (4) EFFLUENT POLLUTANT SCAN
[NCGS 143-215.1 (b)]
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: 2017, 2019 and 2021. 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. Samples should
be collected with one quarterly toxicity test each year, and must 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)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate
Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury (Method 1631E)
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
C0610 1,2-dichloroethane
50060 Trans-1,2-dichloroethylene
00300 1,1-dichloroethylene
00620 1,2-dichloropropane
00615 1,3-dichloropropylene
00625 Ethylbenzene
00556 Methyl bromide
C0665 Methyl chloride
70295 Methylene chloride
00900 1,1,2,2-tetrachloroethane
01097 Tetrachloroethylene
01002 Toluene
01012 1,1,1-trich loroetha ne
01027 1,1,2-trichloroethane
01034 Trichloroethylene
01042 Vinyl chloride
01051 Acid -extractable compounds:
COMER P-chloro-m-cresol
01067 2-chlorophenol
01147 2,4-dichlorophenol
01077 2,4-dimethylphenol
01059 4,6-dinitro-o-cresol
01092 2,4-dinitrophenol
00720 2-nitrophenol
32730 4-nitrophenol
Pentachlorophenol
34210 Phenol
Page 7 of 12
32103
34546
34501
34541
77163
34371
34413
34418
34423
81549
34475
34010
34506
34511
39180
39175
34452
34586
34601
34606
34657
34616
34591
34646
39032
34694
Bis (2-chloroethoxy) methane
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a,h)anthracene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
34278
34273
34283
39100
34636
34292
34581
34641
34320
39110
34596
34556
34536
34566
34571
34631
34336
34341
34611
C0626
34346
C0376
34381
C0700
39702
34386
34396

Permit NC0050342
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 34526 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 34551
1,1-dichloroethane 34496 Benzo(k)fluoranthene 34242
Reporting. Test results shall be reported electronically via eDMR or on DWR Form — DMR-PPA-1 (or
on a form approved by the Director) by December 31 st of each designated sampling year. The report
shall be submitted to the following address:
NC DEQ / DWR / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also
subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5)
and EPA Municipal Application Form 2A. The US EPA requires four (4) toxicity tests for a test
organism other than the test species currently required in this permit. The second species tests should be
conducted either quarterly for a 12-month period prior to submittal of the permit renewal application, or
four tests performed at least annually in the four and one half year period prior to the application. The
second species tests must be multiple concentration (5 concentrations plus the control). These tests shall
be performed for acute or chronic toxicity, whichever is specified in this permit. POTWs performing
NPDES chronic Ceriodaphnia testing should perform chronic Fathead minnow testing. POTWs
performing NPDES acute Fathead Minnow testing should perform acute Ceriodaphnia testing. POTWs
performing NPDES chronic Mysid shrimp testing should perform chronic Silverside Minnow testing.
The second species toxicity test results shall be filed with the Aquatic Toxicology Branch at the
following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E
(Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal
application to the NPDES Permitting Unit.
A. (5) POTENTIAL INSTREAM SAMPLING EXEMPTION
[15A NCAC 02B.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.
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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 sampling
shall be resumed at the first opportunity after the risk period has ceased.
A. (6) MERCURY MINIMIZATION PLAN (MMP)
[NCGS 143-215.1 (b)]
The permittee shall develop and implement a mercury minimization plan during this permit term. The
MMP shall be developed by February 28, 2018, and shall be available for inspection on -site. A sample
MMP was developed through a stakeholder review process and has been placed on the Division website
for guidance (http://deq.nc.gov/about/divisions/water-resources/water-resources-permits/wastewater-
branch/npdes-wastewater-permits, under Model Mercury Minimization Plan). 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 Mercury Minimization Plan 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 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. (8) 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 special condition 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)]
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
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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 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 / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 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(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
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Permit NC0050342
Electronic Reporting Rule is found at: https://www.federalregi ster.gov/documents/2015/10/22/2015-
24954/national pollutant-discharge-elimination-system-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to
the Division. Requests for temporary electronic reporting waivers must be submitted in writing to
the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin submitting monitoring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data
and reports shall be submitted electronically to the Division unless the permittee re -applies for and is
granted a new temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request may
submit monitoring data and reports on paper to the Division for the period that the approved
reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisionsiwater-resources/edmr
4. Signatory Requirements 'Supplements Section B. (11.) {b] and Supersedes Section B. (11.)
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining an eDMR user account, please visit
the following web page:
http://decL.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
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Permit NC0050342
am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations."
5. Records Retention (Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years from the
date of the report. This period may be extended by request of the Director at any time [40 CFR
122.41].
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City of Winston-Salem
Muddy Creek WWTP
NPDES Permit NC0050342
Receiving Stream: Yadkin River 001, Muddy Creek 002
Stream Segment: 19-(93.7): 001
and 12-94-(0.5): 002
River Basin: Yadkin Pee -Dee
County: Forsyth
Stream Class: WS-IV
Sub -Basin #: 03-07-04
HUC: 03040101
A
SCALE
1:50,000
Facility Location
scale not shown
35.930833° ,-80.369167° :001
35.991944° ,-80.333056° :002
USGS Quad: Welcome