NC0085359_Draft Permit_20210209

d#ORE 4
r 'is
ROY COOPER , t , '.�
� r,�i c�,
Governor
MICHAEL S.REGAN i
Secretary .-_
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
February 9, 2021
Mr. Andrew Neff,P.E.
Water and Wastewater Division Director
Union County Public Works
4600 Goldmine Road
Monroe,North Carolina 28112
Subject: Draft NPDES Permit Renewal
Permit NC0085359
Twelve Mile Creek WRF
Union County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Neff:
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. Changes made to the draft permit sent to you on November 24, 2020 are outlined below.
The following changes were made to the draft permit sent to you on November 24,2020:
• A typographical error regarding the monitoring frequencies for total phosphorous and total
nitrogen in Sections A.(1.) through A.(3.) has been corrected.
• A typographical error has been corrected in the header to Section A.(3.).
• Special Condition A.(8.)has been corrected to reference total zinc instead of total silver.
• The facility components list in the supplement to cover has been updated for accuracy.
• Per request by the County, CBOD5 limits have replaced BOD5 limits [See A.(1.)—A.(3.)].
This draft permit maintains the following significant changes identified in the letter sent on
November 24, 2020:
• As the Division has received a signed Engineer's Certificate indication construction has
been completed under ATC No. 085359A07, the 6.0 MGD flow tier has been removed
from the permit and the facility is under operation at the 7.5 MGD flow tier[See A.(1.)].
• Per the Name/Ownership Change Request received on November 23, 2020, the facility
name has been changed from "Twelve Mile Creek WWTP"to "Twelve Mile Creek
WRF."
• Based on the 2012 Statewide Mercury TMDL implementation guidance, Special
Condition A.(9.)Mercury Minimization Plan has been removed from the permit.
• Based on the reasonable potential analysis(RPA) showing reasonable potential to violate
state water quality standards based on a limited data set, quarterly monitoring for total
cadmium has been added to the permit [See A.(1.), A.(.2), and A.(3.)].
• Based on review of instream monitoring data, the Division has removed sampling
requirements at the location "one quarter mile downstream from the outfall, before
confluence with the first tributary" [See A.(1.), A.(.2), and A.(3.)].
D-E - • North CarolinallorthSalisbury DepartmentStreet1 of1617 Environmental
ServiceCenter Quality I Division of Water
NorthCarolina Resou27rces
(((� 512 I Balogh. 699-1617
Ike•W e,E. eako.i s� / 919.707.9000

• Some of the wording has changed in Special Condition A.(4.),Chronic Toxicity Permit
Limit,please review each paragraph carefully.
• As the Division is moving to accept data electronically through the eDMR system, the
requirement to submit physical nutrient worksheets has been removed from the permit.
The Permittee shall continue to report Monthly Average Total Phosphorous and 12-
Month Mass Average Loading Total Phosphorous via the Division's eDMR system [See
Special Condition A.(5.)]
• To provide verification of the site-specific criteria for copper and silver developed as a
result of the County's 2005/2006 Water Effect Ratio study, Special Condition A.(8.)
Water Effect Ratio Confirmation Study has been added to the permit.
• Special Condition A.(3.)has been modified to include the specific three years in which
the Effluent Pollutant Scan shall be performed(2022,2023, and 2024). 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.As
such, Special Condition A.(10.)Additional Toxicity Testing Requirements for Municipal
Permit Renewal has been removed from the permit.
• A notation was made concerning the Electronic Reporting Rule—Phase 2 Extension.
EPA has extended the Phase 2 deadline from December 21,2020,to December 21,2025
[See Special Condition A.(7.)]
• Parameter codes have been added to the Effluent Limitations and Monitoring
Requirements [ See A.(1.),A.(.2),and A.(3.)].
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 Union 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 contact me at(919) 707-3609 or by email at [e-mail].
Sincerely,
j
Nick Coco, Engineer
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Central Files
Ecopy: US EPA Region 4
DWR/Mooresville Regional Office/Water Quality/Corey Basinger
DWR/Operator Certification Program/Maureen Kinney
DWR/Aquatic Toxicology Branch/Cindy Moore and Zach Thomas
SCDHEC/DWQ/303(d),Modeling&TMDL Manager/Wade Cantrell
Page 2 of 2

Permit NC0085359
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
Union County Public Works
is hereby authorized to discharge wastewater from a facility located at the
Twelve Mile Creek Water Reclamation Facility
8299 Kensington Drive
Waxhaw
Union County
to receiving waters designated as Twelve Mile Creek in the Catawba River Basin
in accordance with the effluent limitations,monitoring requirements,and other applicable conditions
set forth in Parts I,II,III,and IV hereof.
This permit shall become effective Month xx,2021.
This permit and authorization to discharge shall expire at midnight on December 31,2025.
Signed this day Month xx,2021.
DRAFT
for S.Daniel Smith,Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0085359
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 Union County Public Works
is hereby authorized to:
1. Continue to operate and maintain an existing 7.5 MGD wastewate tment facility consisting of
the following components:
• Mechanical Bar Screens
• Influent pump station with stand-by generator
• Vortex grit tanks
• Carbon odor control facility
• Biological Nutrient Removal(BNR)Distribution Bo
• Four(4)BNR basins with anaerobic,anoxic and aerobic
• Blower building with standby generator
• MLSS distribution box
• Sodium Aluminate storage and feed • chemical phosphorous trim
• Four(4)final clarifiers
• Three(3)disc filters
• One(1)UV disinfection facility
• Cascade post aeration
• Thickening/Dewatering facility [Two(2)gr. 'ty belt thickeners and two(2)belt filter presses]
• Four aerobic digesters with jet aeration
• 2-stage wet*ubber odor control facility
• Main plant standby generator ivy
This facility is located at the Twelve Mile Creek Water Reclamation Facility,8299 Kensington Drive,
Waxhaw, Union County,and
2. Upon ce of an Authorization to Construct(ATC)permit by the Division and submission of
the En:' ` `-r's Certification for construction completion,operate a wastewater treatment facility up
to a design flow of 9 MGD,and
3. Upon issuance of an Authorization to Construct(ATC)permit by the Division and submission of
the Engineer's Certification for construction completion,operate a wastewater treatment facility up
to a design flow of 12 MGD,and
4. Discharge from said treatment works at the location specified on the attached map via Outfall 001
into Twelve Mile Creek,classified C waters in the Catawba River Basin.
Page 2 of 13

Permit NC0085359
PART I
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [7.5 MGD]
[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 expansion above
7.5 MGD or permit expiration,whichever comes first,the permittee is authorized to discharge
treated municipal wastewater from Outfall 001. Such discharges shall be limited and monitored)
by the permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location2
Flow 50050 7.5 MGD Continuous Recording I or E
CBOD,5 day, 20°C3 80082 5.0 mg/L 7.5 mg/L 2/week4 Composite I and E
(March 1-October 31)
CBOD, 5 day,20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1-February 28/29)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
as N C0610 1.0 mg/L 3.0 mg/L 2/week4 Composite E
(March 1-October 31)
NH3 as N C0610 2.0 mg/L 6.0 mg/L 2/week4 Composite E
(November 1-February 28/29)
Fecal Coletriform 31616 200/100 mL 400/100 mL 2/week4 Grab E
(geometric mean)
Dissolved Oxygen 00300 Daily Average 2 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
RM665 Monthly Average:41.70 pounds/day
Total Phosphorus' RA665 12 Month Average: 20.85 pounds/day Monthly Composite E
Total Nitrogen (mg/L) C0600 Monitor and Report Monthly Calculated E
Total Cadmium(pg/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP3B Monitor and Report Quarterly Composite E
Pollutant Scan' NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable2 Grab U and D
Temperature°C 00010 Monitor and Report Variable2 Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall be grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 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. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia dubia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
Page 3 of 13

Permit NC0085359
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [9.0 MGD]
[15A NCAC 02B.0400 et seq.,15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon receipt of the Engineer's Certification for completion of the expansion to 9.0
MGD and lasting until expansion above 9.0 MGD or permit expiration,whichever comes first, the
Permittee is authorized to discharge treated wastewater from Outfall 001. Such discharges shall
be limited and monitored'by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location2
Flow 50050 9.0 MGD Continuous Recording I or E
CBOD, 5 day,20°C3 80082 5.0 mg/L 7.5 mg/L 2/week4 Composite I and E
(March 1-October 31)
CBOD,5 day,20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1-February 28/29)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
NH3as N C0610 1.0 mg/L 3.0 mg/L 2/week4 Composite
E
(March 1-October 31)
NH3 as N C0610 2.0 mg/L 6.0 mg/L 2/week4 Composite E
(November 1-February 28/29)
Fecal Coliform 31616 200/100 mL 400/100 mL 2/week4 Grab E
(geometric mean)
Dissolved Oxygen 00300 Daily Average>_ 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
s RM665 Monthly Average:41.70 pounds/day
Total Phosphorus Monthly Composite E
RA665 12 Month Average: 20.85 pounds/day
Total Nitrogen (mg/L) C0600 Monitor and Report Monthly Calculated E
Total Cadmium(ug/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP3B Monitor and Report Quarterly Composite E
Pollutant Scan' NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable2 Grab U and D
Temperature°C 00010 Monitor and Report Variable2 Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall be grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective influent
value(85%removal).
4. Upon expansion above 7.5 MGD,the County shall revert back to daily sampling of these parameters.After 6 months of daily
sampling,the Permittee may return to twice per week sampling for the parameters for which no permit limit violations have
occurred.Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia dubia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
Page 4 of 13

Permit NC0085359
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS[12.0 MGD]
[15A NCAC 02B.0400 et seq.,15A NCACO2B .0500 et seq.] Grade IV
Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon receipt of the Engineer's Certification for completion of the expansion to 12.0
MGD and lasting until permit expiration, the Permittee is authorized to discharge treated
wastewater from Outfall 001. Such discharges shall be limited and monitored.'by the Permittee as
specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER - - -- - -
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 2
Flow 50050 12.0 MGD Continuous Recording I or E
CBOD, 5 day,20°C3 80082
(March 1 October 31) 5.0 mg/L 7.5 mg/L 2/week4 Composite I and E
CBOD, 5 day, 20°C3 80082 10.0 mg/L 15.0 mg/L 2/week4 Composite I and E
(November 1-February 28/29)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/week4 Composite I and E
NH3as N C0610 1.0 mg/L 3.0 mg/L 2/week4 Composite
E
(March 1-October 31)
NH3as N C0610 2.0 mg/L 6.0 mg/L 2/week4 Composite
E
(November 1-February 28/29)
Fecal Coliform 31616 200/100 mL 400/100 mL 2/week4 Grab E
(geometetrric mean)
Dissolved Oxygen 00300 Daily Average >_ 6.0 mg/L Daily Grab E
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab E
Temperature°C 00010 Monitor and Report Daily Grab E
Total Phosphorus5 RM665 Monthly Average:41.70 pounds/day Monthly Composite E
RA665 12 Month Average: 20.85 pounds/day
Total Nitrogen (mg/L) C0600 Monitor and Report Monthly Calculated E
Total Cadmium(pg/L) 01027 Monitor and Report Quarterly Composite E
Chronic Toxicity6 TGP3B Monitor and Report Quarterly Composite E
Pollutant Scan' NC01 Monitor and Report Footnote 7 Footnote 7 E
Dissolved Oxygen (mg/L) 00300 Monitor and Report Variable2 Grab U and D
Temperature°C 00010 Monitor and Report Variable2 Grab U and D
Footnotes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR application system. See Special
Condition A.(7.).
2. Sample locations I-Influent,E-Effluent,U-Upstream=at least 50 feet upstream from the outfall,D-Downstream=at NCSR 1301.
Upstream and downstream samples shall be grab samples collected 3/week during June,July,August,and September and
1/week during the remainder of the year.Additional downstream dissolved oxygen monitoring is recommended to provide DO
stream profile of Twelve Mile Creek in North Carolina and South Carolina.
3. The monthly average effluent CBOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective influent
value(85%removal).
4. Upon expansion above 9.0 MGD,the County shall revert back to daily sampling of these parameters.After 6 months of daily
sampling,the Permittee may return to twice per week sampling for the parameters for which no permit limit violations have
occurred.Twice per week sampling must occur on any two non-consecutive days during the calendar week.
5. Special Condition A.(5.)describes the methodology for calculation of the monthly average and 12-month limits.
6. Chronic Toxicity(Ceriodaphnia dubia)P/F at 90%with testing in February,May,August,and November.See Special Condition
A.(4.).
Page 5 of 13

Permit NC0085359
7. The permittee shall perform three effluent pollution scans during the term of this permit.See Special Condition A.(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(4.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY)
[15A NCAC 02B.0200]
The effluent discharge shall at no time exhibit observable inhibition of repeduAtm or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90%at 7.5 MGD,9.0 MGD and 12.0
MGD flow.
The permit holder shall perform at a minimum,quarterly monitoring using test procedures outlined in
the"North Carolina Ceriodaphnia Chronic Effluent BioassayProcedure, Revised December 2010,or
P
subsequent versions or"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised-December 2010)or subsequent versions.The tests will be rformed during the months of
February,May,August,and November.These moms signify the f. onth of each three-month
toxicity testing quarter assigned to the facility.Effluent sampling sting mustte obtained
during representative effluent discharge and shall be performed at the NPDES permitted final effluent
discharge below all treatment processes. vi
If the test procedure performed as the first test of any single qu er results in a failure or ChV
below the permit limit,then multiple-concentration testing shall be performed at a minimum,in
each of the two following months as described in"North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure"(Revised-December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered electronically using
the Division's eDMR system for the month 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 Carolin ivision of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
• . can be sent to the email,ATForms.ATBQncdenr.gov.
Comple. ' quatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after + ,d of the reporting period for which the report is made.
Test data sha omplete,accurate,include all supporting chemical/physical measurements and all
concentration/re'ponse 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 How"in the comment area of the form. The report shall be submitted
to the Water Sciences Section at the address cited above
Page 6 of 13

Permit NC0085359
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
monitoring will be required during the following month. Assessment of toxicity compliance is based on
the toxicity testing quarter,which is the three month time interval that begins on the first day of the
month in which toxicity testing is required by this permit and continues until the final day of the third
month.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Resources indicate potential impacts to the receiving stream,this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document,such as minimum
control organism survival,minimum control organism reproduction,and appropriate environmental
controls,shall constitute an invalid test and will require immediate follow-up testing to be
completed no later than the last day of the month following the month of the initial monitoring.
A.(5.) TOTAL PHOSPHOROUS (TP) MONITORING
[G.S. 143-215.1(b)]
The Permittee shall calculate a 12-month rolling average mass loading as the sum of monthly loadings,
according to the following equations:
(1) Monthly Average(pounds/day) =TP x Qw x 8.34
Where:
TP=the arithmetic average of total phosphorus concentrations (mg/L) obtained via composite samples
(either daily,weekly,or monthly average values)collected during the month
Qw=the average daily waste flow(MGD) for the month
8.34=conversion factor,from (mg/L x MGD) to pounds
The 12-month rolling average mass loading is defined as the sum of the monthly average loadings for
the previous 12 months inclusive of the reporting month: 1,
TPma+12
(2) onth Average Mass Loading(pounds/day)= 1 (inclusive of reporting month)
Where:
TPma is d as the tota phosphorus monthly average mass loading(calculated above).
The monthly average d 12-month average mass loadings shall be reported electronically using the
Division's eDMR system for Twelve Mile Creek WWTP.
The Permittee shall report the TP concentration for each sample electronically using the Division's
eDMR system. Reporting of and compliance with the TP limit shall be done on a monthly basis.
Page 7of13

Permit NC0085359
A.(6.) EFFLUENT POLLUTANT SCAN (Municipal POTWs)
[G.S.143-215.1(b)]
a. 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: 2022,2023,and 2024.
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) 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 C Bis(2-ethylhexyl)phthalate CO100
Nitrate/Nitrite 00630 1,3-dichloropropylene 4-bromophenyl phenyl ether 34636
Kjeldahl nitrogen 00625 Ethylbenzene 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 chlorid4, 34423 sene 34320
Hardness 00900 1,1,2,2-tetrachloroethane 8154 n-butyl phthalate 39110
Antimony 01097 Tetrachloroethylene 34475 Di-n-octyl phthalate 345%
Arsenic 01002 Toluene 34010 Dibenzo(a,h)anthracene 34556
Beryllium 01012 1,1,1- oroethane 34506 ' 1,2-dichlorobenzene 34536
Cadmium 01027 1,1,2-t loroethane 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) R P-chloro-mesol 344. Dimethyl phthalate 34341
Nickel 2-chlorophenol 34586 2,4-din itrotoluene 34611
Selenium 0114 , 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 '°AI -2.nitrophenol 34591 Hexachlorobenzene C0700
Total ph=.- ds 4-nitrophenol 34646 Hexachlorobutadiene C0702
Vole. _..finta.,.. Pentachlorophenol 39032 Hexachlorocyclo-pentadiene 34386
1 A. - 34210 •I a- 34694 Hexachloroethane 343%
lonitrile ' 34215 ,. trichlorophenol 34621 Indeno(1,2,3-cd)pyrene 34403
-- e 34030 :ase-neutral compounds: Isophorone 34408
I 'rm 32104 Acenaphthene 34205 Naphthalene 346%
Care. ' .achloride 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 344% Benzo(k)fluoranthene 34242
1,2-dichloroethane 32103 Bis(2-chioroethoxy)methane 34278
b. Reporting. Test results shall be reported electronically using the Division's eDMR system or on
DWR Form DMR-PPA-1(or on a form approved by the Director)by December 31st of each
designated sampling year.
Page 8 of 13

Permit NC0085359
c. 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 utilizing the DWR Form submit to the
following address:
NC DEQ/DWR/NPDES 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
d. Additional Toxicity Testing Requirements for Municipal Per. • •newal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Sc. , 3 ements listed above are
also subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR
122.21(j)(5). The US EPA requires four(4)toxicity tests for a test organism other than the test
species currently required in this permit. The multiple 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 onelf year perio rior to the application. These
tests shall be performed for acute or chronic tol city,whichev ified in tl4is permit. The
multiple species toxicity test results shall be filed with the Aquatic oxicology Branch at the
following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branc `
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Or,results can be sentfe email,ATFo s.ATB@ncdenr. ov.
Contact the Division's Aquatic Toxicology ch at 919-743-8401 for guidance on conducting
the additional toxicity tests and reporting re"uirements. 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.(7.) ELECTRONIC REP I TING OF MONITORING REPORTS
[GS.143-215.1(b)]
Federal regulations r• ire 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
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Permit NC0085359
1. Reporting Requirements [Supersedes Section D.(2.1 and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application.
Monitoring results obtained during the previous month(s)shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to
enter monitoring data and submit DMRs electronically using the internet. e 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. ., uplicate s' ed copies shall be sultmitted to
the following address:
NC DEQ/ Division of Water Resources/ Water Quality .ermitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
See"How to Request a Waiver from Elec 'c Reporting"section below.
Regardless of the submission method,the fir R is dueon the last day of the month following
the issuance of the permit or in the case of a n 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 Progratp Annual Reports;and
• Clean Water Act(CV1)Sectii 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)].
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Permit NC0085359
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:hops://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 waive` must be submitted in writing to
the Division for written approval at least sixty(60)days prior t the date the facility would be
required under this permit to begin submitting monitoring data snd 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 permiiee re-applies for
and is granted a new temporary electronic reporting waiver by the Division. Approved electronic
reporting waivers are not transferrable. Only permittees wi approved reporting waiver
request may submit monitoring data . • •.its on paper to isi for the period that the
approved reporting waiver request is a
Information on eDMR and the application a te.,pp ;.orary electronic reporting waiver are found on
the following web page: lir
http://deq.nc.gov/• •ut/di s/water-re- rces/edmr
4. Signatory Requirements - Section B. (11.) (b) and Supersedes Section B. (11.)
(d)1
All eDMRs submitte*. to the permit issuing authority shall be signed by a person described in Part
II,Section B.(11.)(. • a duly authogzed representative of that person as described in Part II,
on B. (11.)(b). A . on,andy a position,must be delegated signatory authority for eDMR
g purposes.
For e l ubmissions, e person signing and submitting the DMR must obtain an eDMR user
account . ••in cred• 'als to access the eDMR system. For more information on North
Carolina's e. • sy. . ,registering for eDMR and obtaining an eDMR user account,please visit
the following ' .ge:
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:
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Permit NC0085359
"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.)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 ' • tor at any time[40 CFR
122.41].
A.(8.) WATER EFFECT RATIO CONFIRMATION STUDY
[G.S.143-215.1(b)]
a. During the period beginning on the effective date of,the permit and prior to the pansion above
7.5 MGD or permit expiration,whichever comes first,the pe nittee shall conduct a confirmatory
Water Effect Ratio study to verify copper and zinc site-specific criteria.
b. The Permittee shall conduct a confirmatory Water Effect Ratio study to verify copper and zinc
site-specific criteria with each NPDES permit renewal.The WER study plan shall be submitted to
the Division for approval prior to the stud be' conducted.The study results shall be submitted
to the Division for approval.
c. The WER study plan and results reports shall include the owner's name,NPDES permit number
and permittee contact person,and shall be submit Rd to:
41
NCDEQ/ Division of*ater Resources
NPDES Municipal Permitting
1617 ail Service Center lellk
• igh,NC 27699-1617
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Permit NC0085359
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Facility Information Facility
Latitude 34'57'01' Sub-Basin: 03-08-38 Location
Longitude. 80°45'44' 8-DiaitHUC 03050103 x
Quad#: H15NE
Stream Class C
Receiving Stream: Twelve Mile Creek NOT TO SCALE Twelve Mile Creek WRF
Permitted Flow 7,5 MGD, 9.0 MGD and 12 0 I,IGD North NC0085359
Union County
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