NC0047597_Draft Permit_20220906

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8858B3A9BBDC
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ROY COOPER i 6V
Governor e
ELIZABETH S.BISER \4a
Secretary
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
September 6, 2022
Ms. Vicki Westbrook
Assistant Director of Water Management
City of Durham
101 City Hall Plaza
Durham, NC 27701
Subject: Draft NPDES Permit Renewal
Permit NC0047597
South Durham WRF
Durham County
Grade IV Biological WPCS
SIC Code 4952
Dear Ms. Westbrook:
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 topographic map was updated to show instream monitoring locations.
• The system component list was updated(see Supplement to Cover Sheet)
• Regulatory citations have been added to the permit.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
sheet [See A. (1.)], Instream Monitoring Requirements [See A. (2.)] and the Effluent
Pollutant Scan [See A. (4.)] sections.
• Based on the implementation of nutrient(TN and TP) load limits,their effective dates have
been removed from the permit [See A. (1.)].
• To better track nutrient loadings and compliance with load limits, monthly rolling 12-
month annual monitoring has been added to the permit [See A. (1.)], and a Nutrient
Optimization special condition has been added to the permit [See A. (8.)].
• 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 in order to calculate permit limitations. However,
because the receiving stream 7Q10 is effectively 0 at 0.15 cfs, instream hardness sampling,

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
upstream of the discharge, is not needed. Effluent hardness has been added to the permit at
a monitoring frequency of quarterly [See A. (1.)].
• Based on the reasonable potential analysis (RPA) showing reasonable potential to violate
state water quality standards, Total Copper, Total Silver, and Total Zinc limits have been
added to the permit and the quarterly monitoring requirements have been changed to
monthly monitoring [See A. (1.)].
• Based on the RPA predicting a maximum effluent Nitrate-Nitrogen (NO3-N) and Total
Dissolved Solids (TDS) concentration that is greater than the allowable discharge
concentration based on state water quality standards, quarterly monitoring for NO3-N and
TDS have been added to the permit [See A. (1)].
• To provide an opportunity for the Town to develop a plan to assess sources of total copper,
total silver and total zinc in order to come in compliance with the limits in Section A. (1.),
a 3-year schedule of compliance with a WER option has been added to the permit [See
Special Condition A. (10.) Schedule of Compliance for Total Copper, Total Silver and
Total Zinc Limitations].
• Based on limited dataset from the investigative sampling in 2019 indicating detectable
levels in the influent, monthly effluent monitoring for 1,4-Dioxane has been added to the
permit [See A. (1.) and A. (2.)].
• Based on Mercury TMDL evaluation showing no individual results exceeded the TBEL of
47 ng/L and no annual average exceeded the WQBEL of 12.0 ng/L, Mercury limits have
been removed from the permit.
• Based on Mercury TMDL evaluation showing detections > 1 ng/L and the design flow is
> 2 MGD, a Mercury Minimization Plan (MMP) special condition has been added to the
permit. [See A. (9.)].
• To provide nutrient data year-round, instream monitoring for TP, PO4, TKN, NO3+NO2
has changed from 1/week, June 1—September 30, to 1/month year-round. [See A. (2.)].
• Wording in Special Conditions A. (3.) Chronic Toxicity Permit Limit, and A. (4.)Effluent
Pollutant Scan have been updated to allow for electronic submittal and to clarify second
species toxicity testing. Please review each special condition carefully.
• Special Condition A. (4.) — Effluent Pollutant Scan has been modified to include the
specific three years in which the Effluent Pollutant Scans shall be performed(2024, 2025,
and 2026). In addition, at the end of the Special Condition, 2nd species Toxicity Testing
Requirements for municipal permit renewals per Federal Regulations [40 CFR
122.21(j)(5)] have been added.
• Monthly monitoring for 1,4-Dioxane was added to the permit.
• A permit reopener special condition has been added to modify 1,4-Dioxane monitoring,
treatment and/or compliance [See A. (11.)].
• A special condition to monitor effluent PFAS chemicals quarterly has been added to the
permit, to be effective six (6) months after EPA has a final wastewater method in 40 CFR
136 method published in the Federal Register [See A. (12.)].
• Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs) and program reports. The requirement to continue reporting discharge monitoring
data electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)
internet application has been added to your NPDES permit [See A. (13.)].
D E Q North CarolinallorthSalisbury DepamentStreetrt i of1617 EnMailvironmentalSery Quality I Division of Water Resources
ice Center I Raleigh.North Carolina 27699-1617
+.ww..o +.�+•r� /' 919.707.9000

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
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 Durham 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(919) 707-3611 or by email at [e-mail].
Sincerely,
DocuSi9ned by:
PU4SA
C952DF8455
Gary Perlmutter, Environmental Specialist II
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR/Raleigh Regional Office /Water Quality/ Scott Vinson
DWR/ Municipal Permitting Unit/Pretreatment (PT) /Keyes McGee
DWR/ Raleigh Regional Office - PT /Cheng Zhang
City of Durham/PT/Tyrone Battle <[e-mail]>
DWR/ Operator Certification Program/Maureen Kinney
DWR/Ecosystems Branch /Mark Vander Borgh
DWR/Aquatic Toxicology Branch/Cindy Moore
DWR/Public Water Supply/ Shawn Guyer
^- North
512North CarolinaSalisbury DepartmentStreet ofIb17 Environmental
ice Center Quality Division of Water
NorthCarolina Resou27brces
`v�J/� Raleigh. 99-1617
IMPIAlmota breinrawsdal ornr 919.707.9000

Docusign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND QUALITYS
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,
City of Durham
is hereby authorized to discharge wastewater from a facility located at the
South Durham Water Reclamation Facility
6605 Farrington Road
Chapel Hill,NC
Durham County
to receiving waters designated as an unnamed tributary to New Hope Creek in the Cape Fear River Basin in
accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III,
and IV hereof.
This permit shall become effective Month 1, 2022.
This permit and authorization to discharge shall expire at midnight on April 30, 2027.
Signed this day Month xx, 2022.
DRAFT
for Richard E. Rogers,Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 18

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
•
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 City of Durham
is hereby authorized to:
1. Continue to operate and maintain the wastewater treatment works identified in the Cover, an existing 20.0
MGD facility consisting of the following components:
• Mechanically cleaned bar screens
• Band bar screens
• Grit cyclones
• Grit classifiers
• Equalization tank
• Primary clarifiers
• Anaerobic tank
• Aeration basins
• Final clarifiers
• Flocculation basins
• Traveling bridge effluent sand filters
• UV disinfection
• Anaerobic digesters
• Gravity thickener tank
• Gravity belt thickener
• Sand drying beds
• Reclaimed water bulk distribution system
• Belt filter press
• ANAMMOX side stream treatment
2. Discharge from said treatment works at the location specified on the attached map via Outfall 001 into an
unnamed tributary to New Hope Creek, classified WS-IV,NSW waters in the Cape Fear River Basin.
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [20.0 MGD]
[15A NCAC 02B .0400 et seq., 15A NCAC 02B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G.0302]
(a.) During the period beginning on the effective date of the permit and lasting until permit 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 EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location2
Flow 50050 20.0 MGD Continuous Recording I or E
Total Monthly Flow 82220 Monitor and Report Monthly Calculated I or E
BODE(20°C)3 80082 5.0 mg/L 7.5 mg/L Daily Composite I and E
(April 1 -October 31)
BODE(20°C)3 80082 7.0 mg/L 10.5 mg/L Daily Composite I and E
(November 1 -March 31)
Total
(T S)Suspended Solids C0530 30.0 mg/L 45.0 mg/L Daily Composite I and E
Ammonia(Nth as N) C0610 1.0 mg/L 3.0 mg/L Daily Composite E
(April 1 -October 31)
Ammonia(NH3 as N) C0610 2.0 mg/L 6.0 mg/L Daily Composite E
(November 1-March 31)
Fecal Coliform 31616 200/100 mL 400/100 mL Daily Grab E
(geometric mean)
Dissolved Oxygen(DO) 00300 Daily Average?6.0 mg/L Daily Grab E
Temperature,°C 00010 Monitor and Report Daily Grab E
pH 00400 Between 6.0 and 9.0 standard units Daily Grab E
Conductivity,µmhos/cm 00094 Monitor and Report Daily Grab E
Total Residual Chlorine 50060 17.0 DailyGrab E
(TRC)4 µ1;2
TKN,mg/L 00625 Monitor and Report Weekly Composite E
NO3-N+NO2-N,mg/L 00630 Monitor and Report Weekly Composite E
Total Nitrogen(TN), C0600 Monitor and Report Weekly Composite E
mg/L
TN Loads•6
QM600 Monitor and Report(lb/mo) Monthly Calculated E
QY600 185,345 lb/yr Annually Calculated E
Total Phosphorus(TP), C0665 Monitor and Report Weekly Composite E
mg/L l
TP Load s.6
QM665 Monitor and Report(Ib/mo) Monthly Calculated E
QM665 14,053 lb/yr Annually Calculated E
Total Hardness(as 00900 Monitor and Report QuarterlyComposite E
CaCO3),mg/L 7 p
Total Copper 8 01042 15.5 µg/L 22.1 µg/L Monthly Composite E
Total Silver 8 01077 0.1 µg/L 1.2 µg/L Monthly Composite E
Total Zinc 8 01092 246.3 µg/L 246.3 µg/L Monthly Composite E
Table continued on next page.
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location 2
Nitrate(as NO3) 00620 Monitor and Report Quarterly Grab E
Total Dissolved Solids 70295 Monitor and Report Quarterly Grab E
(TDS)
1,4-Dioxane,µg/L 82388 Monitor and Report Monthly Grab E
PFAS various Footnote 9 Quarterly Grab E
Chronic Toxicity TGP3B Footnote 10 Quarterly Composite E
Effluent Pollutant Scan NC01 Monitor and Report Footnote 11 E
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system.
See Special Condition A.(14.).
2. Sample locations: I=Influent,E=Effluent. See Condition A. (2.), for Instream Monitoring Requirements.
3. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value
(85%removal).
4. Limit and monitoring applies only when chlorine is added to treatment system. 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.
5. See Special Condition A. (7.) Calculation of Total Nitrogen or Total Phosphorus Loads. Monthly 12-month rolling
total load shall be calculated and reported.
6. Compliance with mass limits shall be determined in accordance with Special Condition A.(6.)Annual Limits for Total
Nitrogen or Total Phosphorus.
7. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals(cadmium,
copper,lead,nickel,silver,and zinc).
8. The Permittee shall follow the Total Copper, Total Silver and Total Zinc compliance schedule detailed in Special
Condition A. (11.). Starting on the effective date of this permit, the Permittee shall perform monthly effluent
monitoring and reporting for Total Copper,Total Silver and Total Zinc.
9. See Special Condition A.(13.).
10. Chronic Toxicity(Ceriodaphnia)at 90%;January,April,July and October. See Special Condition A.(3.).
11. The Permittee shall perform three Effluent Pollutant Scans and four second-species effluent toxicity tests during the
term of this permit. See Special Condition A. (4.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(2.) INSTREAM MONITORING REQUIREMENTS [15A NCAC 02B .0200]
Beginning upon the permit effective date and lasting until expiration, the Permittee shall perform instream
sampling upstream and downstream of Outfall 001 as specified below:
PARAMETER SAMPLE MONITORING FREQUENCY SAMPLE
Parameter Code
TYPE Jun 1—Sep 30 Oct 1—May 31 LOCATION
Dissolved Oxygen(DO),mg/L 00300 Surface 3/week Weekly U,D
Temperature(°C) 00010 Surface 3/week Weekly U,D
Conductivity(µmhos/cm) 00094 Surface 3/week Weekly U,D
Fecal Coliform(cfu/100 mL) 31616 Surface 3/week Weekly U,D
pH(SU) 00400 Surface 3/week Weekly U,D
Total Phosphorus(TP),mg/L C0665 Surface Monthly U,D
Orthophosphate(POO),mg/L 00660 Surface Monthly U,D
Total Kjeldahl Nitrogen(TKN), 00625 Surface Monthly U,D
mg/L
Nitrate+Nitrite(NO3+NO2), 00630 Surface Monthly U,D
mg/L
Footnote:
1. U=upstream, located at I-40;D=downstream, located at NCSR 1107. Instream monitoring for all parameters is
provisionally waived considering the Permittee's participation in the Upper Cape Fear 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.
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Permit NC0047597
A.(3.) FRESHWATER 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 90%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent
versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised December
2010) or subsequent versions. The tests will be performed during the months of 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 Chronic Value
(ChV) below the permit limit, then multiple-concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised-December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed, using the parameter code TGP3B for
the pass/fail results and THP3B for the Chronic Value.Additionally, DWR Form AT-3 (original)is to be sent to
the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Or, results can be sent to the email, ATForms.ATB(a,ncdenr.gov
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.
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Permit NC0047597
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.
If the Permittee monitors any pollutant more frequently than required by this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT Form
submitted.
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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Permit NC0047597
A.(4.) ADDITIONAL MONITORING REQUIREMENTS FOR PERMIT RENEWAL
[NCGS 143-215.1(b)]
(a.) Effluent Pollutant Scans. The Permittee shall perform a total of three (3)Effluent Pollutant Scans for all
parameters listed below. One scan must be performed in each of the following years: 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.(3.)
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 CO100
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 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
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Permit NC0047597
(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 eDMR system by entering"1"or"Y"for parameter code NC01 -
Annual Pollutant Scan. If written reports are approved,the report shall be submitted to the following
address:
North Carolina Division of Water Resources
Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
Or the form may be uploaded at: https://edocs.deq.nc.gov/Forms/NPDES WW-EDMR-Supplemental-
Form
(c.) 2°d-Species Toxicity Testing and Reporting.
(i.) In addition to the quarterly toxicity tests required in Condition A.(3.)CHRONIC TOXICITY
PERMIT LIMIT(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(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(ancdenr.gov
(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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UocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(5.) NUTRIENT ALLOCATIONS [15A NCAC 02B .0270]
(a.) The following table lists the Total Nitrogen(TN) and Total Phosphorus(TP)allocations and offset credits
(if any) assigned to, acquired by, or transferred to the Permittee in accordance with the Jordan Lake
nutrient management rule (15A NCAC 02B .0270) and the status of each as of permit issuance. The
allocations in this table are not enforceable nor do they supersede any TN or TP limit established
elsewhere in this permit or in the NPDES permit of a compliance association of which the Permittee is a
Co-Permittee Member.
Total Nitrogen Allocation
ALLOCATION ALLOCATION AMOUNT
TYPE SOURCE DATE STATUS
Delivered(lb/yr) Discharge(lb/yr)
Base Assigned by Rule 8/11/09 139,009 185,345 Active
(T 15A NCAC 02B.0270)
TOTAL 139,009 185,345 Active
Footnote:
1 Nitrogen Transport Factor=75%
Total Phosphorus Allocation
OCA ALLOCATION AMOUNT
ALLOCATION '
OCA SOURCE DATE STATUS
TYPE
Delivered(Ib/yr) Discharge(lb/yr)
Base Assigned by Rule 8/11/09 9,415 14,053 Active
(T15A NCAC 02B.0270)
TOTAL 9,415 14,053 Active
Footnote:
1 Phosphorus Transport Factor=67%
(b.) Any addition, deletion, or modification of the listed allocation(s) (other than to correct typographical
errors) or any change in status of any of the listed allocations shall be considered a major modification of
this permit and shall be subject to the public review process afforded such modifications under state and
federal rules.
Page 10 of 18

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(6.) ANNUAL LIMITS FOR TOTAL NITROGEN OR TOTAL PHOSPHORUS
[15A NCAC 02B .0270]
(a.) Total Nitrogen (TN) and Total Phosphorus (TP) allocations and load limits for NPDES dischargers in the
Jordan Lake watershed are annual limits and apply on a calendar year basis.
(b.) For any given calendar year, the Permittee shall be in compliance with the annual TN (or TP) Load limit
in this Permit if:
(i.) the Permittee's annual TN (or TP)Load is less than or equal to the effective limit,or
(ii.) the Permittee is a Co-Permittee Member of a compliance association.
(c.) If the Permittee is not a co-permittee member of a compliance association and the Permittee's cumulative
annual TN (or TP) discharge exceeds the effective TN (or TP) Load limit in this permit at any point
during the calendar year, the Permittee is in violation of its TN (or TP) Load limit for the remaining days
of that year, and each day of such continuing violation shall constitute a separate violation.
(d.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in the
Permittee's allocations.
(i.) Allowable changes include those resulting from purchase of TN (or TP) allocation from an
authorized mitigation banker, the Ecosystem Enhancement Program, or other source allowed under
applicable regulations; purchase, sale, trade, or lease of allocation between the Permittee and other
dischargers; regionalization; and other transactions approved by the Division.
(ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to reflect
allowable changes in its allocation(s).
(A) Upon receipt of timely and proper application, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B) Changes in TN (or TP) limits become effective on January 1 of the year following permit
modification. The Division must receive application no later than August 31 for changes
proposed for the following calendar year.
(iii.) Any requests for modification should be sent to:
NC DEQ/DWR/NPDES Programs
Attn: Jordan Lake Watershed Coordinator
1617 Mail Service Center
Raleigh,NC 27699-1617
(e.) If the Permittee is a member and co-permittee of an approved compliance association on January 1 of a
given year, its TN and TP discharges during that year are governed by that association's group NPDES
permit and the limits therein.
(i.) The Permittee shall be considered a Co-Permittee Member for any given calendar year in which it is
identified as such in Appendix A of the association's group NPDES permit.
(ii.) Association roster(s) and members' TN and TP allocations will be updated annually and in
accordance with state and federal program requirements.
(iii.) If the Permittee intends to join or leave a compliance association, the Division must be notified of
the proposed action in accordance with the procedures defined in the association's NPDES permit.
(A) Upon receipt of timely and proper notification, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B) Membership changes in a compliance association become effective on January 1 of the year
following modification of the association's permit.
The TN and TP monitoring and reporting requirements in this Permit remain in effect throughout the term
of the Permit and are not affected by the Permittee's membership in a compliance association.
Page 11 of 18

DocuSign Envelope ID:CC12438B-EG13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(7.) CALCULATION OF TOTAL NITROGEN OR TOTAL PHOSPHORUS LOADS
[15A NCAC 02B .0270]
(a.) The Permittee shall calculate monthly, annual and rolling annual TN Loads as follows:
(i.) Monthly TN (or TP)Load(lb/mo)=TN(or TP) x TMF x 8.34
where:
TN or TP = the average Total Nitrogen or Total Phosphorus concentration(mg/L)of
the composite samples collected during the month;
TMF = the Total Monthly Flow of wastewater discharged during the month
(MG/mo);
8.34 = conversion factor, from(mg/L x MG)to pounds.
(ii.) Annual TN(or TP)Load(lb/yr)=Sum of the 12 Monthly TN(or TP)Loads for the calendar year.
(iii.) Rolling Annual TN(or TP)Load(lb/yr)=Sum of the previous 12 Monthly TN(or TP)Loads.
(b.) The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo) in the
appropriate discharge monitoring report for each month and shall report each calendar year's results(1b/yr)
with the December report for that year.
A. (8.)NUTRIENT OPTIMIZATION [15A NCAC 02B .0270]
(a.) Not later than [date], within six(6)months of the permit effective date,the Permittee shall:
(i.) Evaluate its treatment facilities and operations,
(ii.) Identify further opportunities to improve and optimize total nitrogen and total phosphorus reduction
in the existing facilities beyond those previously implemented pursuant to NCGS 143-215.1B(d),and
(iii.) Submit a report to the Division documenting its findings, proposing optimization measures, and
describing expected results.
(b.) No later than six months following the Division's written acceptance of the report, or as provided in the
acceptance,the Permittee shall implement the proposed measures.
(c.) Beginning one year following the Division's acceptance of the report and continuing through permit
expiration, the Permittee shall submit an annual progress report to the Division by February 1
documenting the status of the proposed measures and the nitrogen reductions achieved at the facility
during the previous calendar year.
(d.) Reports shall be submitted to:
NCDENR/DWQ/NPDES Programs
Attn:Jordan Lake Watershed Coordinator
1617 Mail Service Center
Raleigh,NC 27699-1617
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
A.(9.) NUTRIENT MONITORING REOPENER[NCGS 143-215.1(b)]
Pursuant to N.C. General Statute Section 143-215.1 and the implementing rules found in Title 15A of the North
Carolina Administrative Code, Subchapter 2H, specifically, 15A NCAC 2H.0112(b) (1) and 2H.0114(a), and
Part II, Sections B-12 and B-13 of this permit, the Director of DWQ may reopen this permit to require
supplemental nutrient monitoring of the discharge. The additional monitoring will be to support water quality
modeling efforts within the Cape Fear River Basin and shall be consistent with a monitoring plan developed
jointly by the Division and affected stakeholders.
A.(10.) MERCURY MINIMIZATION PLAN [NCGS 143-215.1(b)]
The Permittee shall develop and implement a mercury minimization plan during this permit term. The MMP
shall be developed within 180 days of the permit effective date 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 (https://deq.nc.gov/document/nc-model-mercury-minimization-plan-dwr-npdes-swp-20130801 ).
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. (11.) SCHEDULE OF COMPLIANCE FOR TOTAL COPPER, TOTAL SILVER AND TOTAL
ZINC LIMITATIONS [NCGS 143-215.1 (b)]
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,Total Silver and Total Zinc limits.
1. If the Permittee wishes to conduct a WER study to develop site-specific metal limitations, then within
six (6) months of the permit effective date, the Permittee shall submit to the Division of Water
Resources a Water-Effect Ratio(WER)study plan for approval.
a. 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. If more than one
metal is included in the WER study, a synergistic WER shall be conducted.
b. If the WER study results in site-specific metal limits, the Permittee shall submit to the Division
a permit modification request to include the WER-derived limits subject to review and approval
by the Division and the appropriate permit modification process.
c. The final metal 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.
2. If the Permittee does not submit a WER study plan for all three parameters within one year of the permit
effective date, then the Permittee shall follow the Compliance Schedule outlined below (replacing the
schedule in section A.10.1. above) and substitute the dates for one, two and three years from the permit
effective date:
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, Total Silver and/or
Total Zinc limitations listed in Section A. (1.). This plan will include specific dates for
completion or implementation of each action.
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit NC0047597
b. Within two (2) years of the permit effective date, 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, Total Silver and/or Total Zinc
limitations specified in Section A. (1.)within three(3)years of the permit effective date.
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 in excess of four months will be
subject to public notice.
The 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 (2)NCDEQ/Division of Water Resources
NPDES Permitting Raleigh Regional Office
1617 Mail Service Center 3800 Barrett Drive
Raleigh,NC 27699-1617 Raleigh,NC 27609
A.(12.) 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. (13.) 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
Page 14 of 18

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit No. NC0047597
A.(14.) ELECTRONIC REPORTING OF 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)l
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://deg.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
h sicall located in an area where less than 10 percent of the households have broadband access, then a
physically
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:CC12438B-EG13-495E-929C-8B58B3A9BBDC
Permit No.NC0047597
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA's website resources to identify the initial recipient
for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity (EPA or
the state authorized by EPA to implement the NPDES program) that is the designated entity for receiving
electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at:
https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-elimination-
system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
3. How to Request a Waiver from Electronic Reporting
The Permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver, a permittee must first submit an electronic reporting waiver request to the Division.
Requests for temporary electronic reporting waivers must be submitted in writing to the Division for written
approval at least sixty (60) days prior to the date the facility would be required under this permit to begin
submitting monitoring data and reports. The duration of a temporary waiver shall not exceed five (5) years
and shall thereupon expire. At such time, monitoring data and reports shall be submitted electronically to the
Division unless the Permittee re-applies for and is granted a new temporary electronic reporting waiver by the
Division. Approved electronic reporting waivers are not transferrable. Only permittees with an approved
reporting waiver request may submit monitoring data and reports on paper to the Division for the period that
the approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
http://deq.nc.gov/about/divisions/water-resources/edlnr
4. Sienatory Requirements [Supplements Section B.(11.)(b)and Supersedes Section B.(11.)(d)l
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section
B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A
person, and not a position,must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account,please visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
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DocuSign Envelope ID:CC12438B-EC13-495E-929C-8858B3A9BBDC
Permit No. NC0047597
those persons directly responsible for gathering the information, the information submitted is, to the best of
my knowledge and belief true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
5. Records Retention (Supplements Section D.(6.)1
The Permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These
records or copies shall be maintained for a period of at least three (3) years from the date of the report. This
period may be extended by request of the Director at any time[40 CFR 122.41].
•
Page 17 of 18

DocuSign Envelope ID:CC12438B-EC13-495E-929C-8B58B3A9BBDC
Permit No. NC0047597
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South Durham WRF - NC0047597 Facility
Location
USGS Quad Name: Southwest Durham Lat.: 35°54'17"
Receiving Stream:UT to New Hope Cr Long,:78°58'24"
Stream Class:WS-IV NSW North
Subbasin:Cape Fear-030605 HUC: 03020101 SCALE 1:24,000
Page 18 of 18
1