NC0031836_Draft Permit_20181127

ROY COOPER -Fila
Governor
.= 1
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER NORTH CAROLINA
Interim Director
Environmental Quality
November 27, 2018
Mr. Andy Smith
Director, Water Resources
City of Statesville
P.O. Box 1111
Statesville,NC 28687-1111
Subject: Draft NPDES Permit Renewal
Permit NC0031836
Fourth Creek WWTP
Grade IV Biological WPCS
Iredell County
SIC Code 4952
Dear Mr. Smith:
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:
• Parameter codes have been added in the effluent monitoring sheets Sections A. (1.) and A.
(2.).
• A footnote has been added to the 4.0 MGD effluent monitoring sheet [Section A. (1.)],
requiring the facility to report annual average flow on the December Discharge Monitoring
Report, and to notify the Division once the annual average flow requires a move to the 6.0
MGD flow tier. See Section A. (1.), Footnote 3.
• Limits for Ammonia-Nitrogen (NH3-N) have been reduced based on North Carolina
ammonia-nitrogen criteria of 1.0 mg/L (summer) and 1.8 mg/L (winter). Changes are
tabulated below:
Summer Winter
Flow Tier Monthly Weekly Monthly Weekly
Avg. Avg. Avg. Avg.
4.0 MGD Interim 12.0 mg/L 35.0 mg/L 18.0 mg/L 35.0 mg/L
4.0 MGD Final 1.9 mg/L 5.7 mg/L 4.7 mg/L 14.1 mg/L
6.0 MGD Interim 2.0 mg/L 6.0 mg/L 4.0 mg/L 12.0 mg/L
6.0 MGD Final 1.6 mg/L 4.8 mg/L 3.7 mg/L 11.1 mg/L
E Q
7?)
North Cnre`:ia Department of Environmental Quality l Ditiision of Water Resources
512 North Salsbury Street I WWII SeMccCent(r I Raleigh,Not di Carolina 27649.1611
919.7 1)7.361)!

To allow time and actions toward meeting the proposed NH3-N limits,a 2-year compliance
schedule has been added to the permit with annual milestones;see Section A. (5.). Existing `
limits are retained as interim NH3-N limits in both effluent sheets [Sections A. (1.) and A.
(2.)] for the period of the compliance schedule,referred to in Footnote 5 of Section A. (1.) 4
and Footnote 4 in Section A. (2.).
• Instream (upstream and downstream) monitoring of Conductivity has been added to the
permit for all flow tiers, based on data review and the presence of industrial users
discharging to the facility. A review of instream data collected by the Yadkin-Pee Dee
River Basin Association (YPDRBA) from January 2013 through December 2016, and
compared with concurrent effluent data submitted by the Permittee, found that the effluent
appeared to be impacting the instream conductivity as downstream concentrations are
higher than those upstream, and effluent concentrations are higher than both. Instream
monitoring will be waived as long as the Permittee remains a member of the YPDRBA
monitoring coalition.
• 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 and
upstream hardness sampling has been added to this permit at a monitoring frequency of
quarterly. See Sections A. (1.) and A. (2.) Effluent Limitations and Monitoring
Requirements for effluent sampling requirements.
• Based on the new water quality standards approved on April 6, 2016 for dissolved metals,
the following limits for Total Copper have been added to your permit:
Flow Tier Monthly Average Daily Maximum
4.0 MGD 29.0 µg/L . 37.0 µg/L
6.0 MGD ' 23.9 µg/L 31.0 µg/L
Results of a reasonable potential analysis (RPA) on submitted data indicated a reasonable
potential to exceed the instream WQS. To allow time and actions toward meeting the new
Total Copper limits,a 3-year compliance schedule has been added to the permit with annual
milestones; see Section A. (6.). Interim monthly Copper monitoring was added to both
effluent sheets [Sections A. (1.) and A. (2.)] for the period of the compliance schedule,
referred to in Footnote 10 of Section A. (1.) and Footnote 7 in Section A. (2.).
Page 2 of 5

• Total Phenols limits and monitoring requirements have been removed from the permit.
Results of an RPA on submitted effluent data found no reasonable potential to exceed the
instream WQS, as all data were below detection at< 50 µg/L.
• The Permittee reported Total Lead and Total Selenium at less than detection,with detection
levels < 3 µg/L and < 5 µg/L, respectively, in the three Effluent Pollutant Scans and the
Discharge Monitoring Results with one non-detect at < 10 µg/L for both parameters on
April 11,2017.The Permittee's allowable discharge concentrations are 12.7 µg/L for Total
Lead and 11.0 µg/L for Total Selenium at 4.0 MGD. DWR's laboratory identifies the
Practical Quantification Limits (PQLs) for Total Lead and Total Selenium as 2.0 µg/L and
1.0 µg/L, respectively. In accordance with 15A NCAC 2B .0500, all data generated for
Total Lead and Total Selenium shall be reported to the lower reporting level of the
procedure. The Permittee should test for Total Lead and Total Selenium down to the
recommended PQL. No limits or monitoring requirements for Total Cadmium or Total
Lead have been added to the permit.
• Effluent mercury was reviewed from February 2014 through January 2018. The Permittee
tested for Total Mercury using EPA test Method 1631E throughout this period. In
accordance with the 2012 Mercury TMDL NPDES Guidance,the Permittee needs to show
annual average effluent concentrations below the water Quality Based Effluent Limitation
(WQBEL) of 26.5 ng/L at 4.0 MGD and 21.7 ng/L at 6.0 MGD, and no exceedance of the
Technology Based Effluent Limitation (TEBL) of 47 ng/L. A review of the data at both
flow tiers showed that the annual averages were below the WQBEL and all data were below
the TBEL. Therefore, no mercury limitation is required, and the mercury limits of 27 ng/L
at 4.0 MGD and 22 ng/L at 6.0 MGD have been removed from the permit.
Forty-two (42) out of 48 low-level effluent mercury samples were over 1 ng/L. Because
your facility is greater than 2 MGD and discharges quantifiable levels of mercury(i.e.,> 1
ng/L), a Mercury Minimization Plan (MMP) requirement has been added to this permit
renewal at both tiers [see Section A. (8)]. Please note that the Permittee shall develop and
implement a MMP during this permit term. The MMP shall be developed within 180 days
of the NPDES 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/about/divisions/water-
resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits, under
NC Model Mercury Minimization Plan),
.**N,
•N
• Effluent Pollutant Scans shall be sampled in three years within the permit term per 40 CFR
122. The years Effluent Pollutant Scans shall be sampled are 2020, 2021 and 2022. 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. See Section A. (4.).
• A nutrient reopener special condition has been inserted to the permit to notify you that
DWR may reopen the permit to implement nutrient requirements in accordance with any
Page 3 of 5
4

future TMDL and/or nutrient management strategy for High Rock Lake; see Section A.
(7.).
• 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
Section A. (9.)].
For information on eDMR, registering for eDMR and obtaining an eDMR user account,
please visit the following web page: https://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.epa.gov/compliance/final-national-pollutant-discharge-
elimination-system-npdes-electronic-reporting-rule.
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/2BZ4xxx 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 Iredell 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,
11/i ilb
Gary Perlmutter, Environmental Specialist II
NPDES Complex Permitting Unit
Page 4 of 5

Hardcopy: NPDES Files
' eCopy: US EPA Region 4
DWR/Operator Certification Unit/Maureen Kinney
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/Ecosystem Branch/Mark Vander Bourgh
DWR/Mooresville Regional Office/Water Quality Operations
Page 5 of 5

Permit NC0031836
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
1' lJl
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North'\Car`olina Environmental Management
Commission, and the Federal Water Pollution Control.,Act,'as amended,
City of'Statesville `�,
� `� v\
is hereby authorized to discliarg``e,,wastewater•.from a facility located at the
,ti ;\
Fourth Creek Wastewater Treatment Plant
F//' 693 ellm FarRoad` •.�
r ~~ Statesv
iille' 'N
Iredell County
to receiving waters designated'`as Forth-Creekwin the adkin-Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements,4and"other conditions set forth in Parts I, II, III and IV
hereof. �, \ `
This permit shall become effectivey�`i,15 th'XX,\20Lx.
This permit and authorization toscharge shall expire at midnight on March 31,2023.
Signed this day Moat2 .20x.
DRiST
Linda Culpepper, Interim Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 16

Permit NC0031836
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.
City of Statesville is hereby authorized to:
1. Continue operation (at a permitted flow of 4.0 MGD) of the existing 6.0 wastewater treatment plant
with a discharge through Outfall 001, consisting of the following treatment units:
• Influent pump station (\y/\\\
• Perforated panel style bar screen system withfa washer and compactor
• Two extended aeration basins with mechanical-aerators y`\ `�,
• Waste and return sludge pumps ti. .ti �`
• Secondary wet well `�,
'` \\\
• Three secondary clarifiers `" ;
• Chlorine disinfection �`t \--„, ,� �`\
• De-chlorination system using sodium liisulfite \\N`
• Aerobic sludge digester `t� ~' 1,.., "�
ti
• Gravity belt thickener'-, '�, ` '`
• Sludge filter press' °�, s :\'',„ `"
• N-Viro soil process residuals stabilization �'
This facility is.�located at the,Fourth Creek WWTP, 693 Bell Farm Road, Statesville, in Iredell
County. ..:.--„\, \ / . '-'2--..,,,,, \\\:,\
2. Operate he existing 6.0 MG D`"facility,,under the Effluent Limitations and Monitoring Requirements
listed in Part,I..A. (2.) of this permit when the annual average flow discharged from the facility
exceeds 3.6 MGD"(90%of the permitted flow of 4.0 MGD).
\ \\\\\\\\ ) )
3. Discharge from said treatment works via Outfall 001, at the location specified on the attached map
. into Fourth Creek currently:classified C waters in the Yadkin-Pee Dee River Basin.
Page 2 of 16

Permit NC0031836
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (4.0 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 the annual average
flow exceeds 3.6 MGD (90% of the permitted flow of 4.0 MGD) or 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:
PARAMETER CHARACTERISTICS EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average• Maximum Frequency Type Location 2
Flow 3 50050 4.0 MGD Continuous'. Recording Influent Effluent r
BOD,5-Day,20°C(Summer: \" ,. -. .� Influent and
April 1-October 31)a C0310 17.0 mg/L 25.5 mg/L\ , �/ ) Daily \C,omposite Effluent
BOD,5-Day,20°C(Winter: " " \ J. Influent and
November 1-March 31)a C0310 27.0 mg/L, '',40.5 mg/L \ < Daily Composite Effluent
\\\ \\
Total Suspended SolidsC0530 30.0 mg/L v ±45Amg/LL''-� \ " Daily Composite Influent Effluent and
(TSS) v -,. ti
NH3--N interim(Summer: ` x •,. `- -
/C0610' 12:0 mg/L 35.0-mg/L / �'- -,., `Daily Composite Effluent
5
April 1 -October 31) / ."---*--,E�.
NH3--N interim(Winter: t� C0610 18.0 g/L 35.0 mg/L, �' Daily Composite Effluent
November 1 -March 31)5 °\ \ f i \ \
NH3 as N final(Summer: ` ' / L__ `' ,
\1 •
(April 1-Octoberr31)5 C0610 :9 mg//L x''~5.7 mgIL�\..'\ Daily Composite Effluent
NH3 as N final''(Winterr ."�,_ =,a \ N. °'-"'�
November 1=March 31)5
C0610 4�7mg/L 14.1 mg I '
c- Daily Composite Effluent
Dissolved Oxygen '' , 00300 .:•'. Daily*Average>5.0 mg/L Daily Grab Effluent
Fecal Coliform `
31616 •200/100 mL `400/100 mL Daily Grab Effluent
(geometric mean) ,,
Total Residual Chlorine ~ 28 50060 1 - 1 DailyGrab Effluent
(TRC)6 / 1 pg/L
Temperature(°C) 00010` , , 'f Monitor and Report Daily Grab Effluent
.../
Conductivity(pmhos/cm) 00094 Monitor and Report Daily Grab Effluent
Total Nitrogen(TN)7(mg/L) C0600 Monitor and Report Weekly Composite Effluent
Total Phosphorus(mgIL) C0665 Monitor and Report Weekly Composite Effluent
pH 00400 Between 6.0 and 9.0 standard units Daily Grab Effluent
Chronic Toxicity 8 TGP3B Quarterly Composite Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report Quarterly Composite Effluent
(mg/L)9
Total Copper interim 18 01042 Monitor and Report Monthly Composite Effluent
Total Copper final 18 01042 29.0 pg/L 37.0 NgIL Monthly Composite Effluent
Page 3 of 16

Permit NC0031836
EFFLUENT LIMITS MONITORING REQUIREMENTS
PARAMETER CHARACTERISTICS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type, Location 2
Effluent Pollutant Scan NC01 Monitor and Report Footnote 11 Footnote 11 Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report Quarterly Grab Upstream
OWL)2,12
Dissolved Oxygen(mg/L)2 00300 Variable 2 Grab Upstream and
Downstream
Temperature(°C)2 00010 ' Variable 2 Grab Upstream and
Downstream
/
Conductivity(pmhos/cm)2 00094 -\ Variable 2 Grab Upstream and
Downstream
Footnotes: \
1. •The Permittee shall submit discharge monitoring.reports electronically the NC DWR's eDMR
application system; see Section A. (9.). \\\\ \ \
2. Upstream = at NCSR 2316. Downstream = approximately 0.5 miles downstream\from the outfall. Samples
shall be collected 3/week from June 1 through September 30,/and collected weekly from October 1 through
May 31. The Permittee has deferred receiving-stream`sampling to the Yadkin-Pee Dee River Basin
Association by memorandum of agreement'(MOA).Should this MOA terminate for any reason,the Permittee
shall immediately inform the Division in writing-and'immediatelyresume instream monitoring in accordance
with this permit. l\ \ y ``\
3. In addition to monthly flow'reporting,•the Permittee shall'report.annuakaverage flow for the calendar year on
the December Discharge Moriitoring\report (DMR).If'this annual average flow requires a move to the
next effluent sheet, the Permittee\shall notify the`Division thattthey are now subject to a new effluent
sheet.
4. The monthly average effluent B�ODsfand-TSS concentrations shall not exceed 15% of the respective influent
J.
value(85%,.removal):.., o �_..� `
5. The facility shall-follow the Ammonia N compliances hedule detailed in Section A. (5.). The Permittee shall
achieve copliance withwthese limitations within two years of the permit effective date.
6. The Division shall consider\alheffluentTRC 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 pg/L.
7. Total Nitrogen = TKN + NO3-I'.T•+ NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate
Nitrogen,and NON is Nitrite Nitrogen.
8. Whole EffluentoTo city''will be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia
dubia at 45%effluent. Samples shall be taken in January,April,July, and October; see Section A. (3.).
9. Effluent Total Hardness sampling should be performed in conjunction with metals sampling.
10. The facility shall follow the Copper compliance schedule detailed in Section A. (6.). The Permittee shall
achieve compliance with these limits within three years of the permit effective date. Copper shall be
monitored monthly until the new limits become effective.
11. The Permittee shall preform three Effluent Pollutant Scans during the term of this permit; see Section A. (4.).
12. The Permittee shall sample instream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 16

Permit NC0031836
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (6.0 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 the average flow discharged exceeds 3.6 MGD 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 EFFLUENT LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location 2
Flow 50050 6.0 MGD �,K\/' \Co tinuous Recording Influent Effluentr
,' ',
BOD,5-Day,20°C(Summer: / ` / \ Influent and
C0310 17.0 mg/L 25.5 mg/L'2.- Daily, . Composite
(April 1—October 31)3 r ,, Effluent
BOD,5-Day,20°C(Winter: .'*, , Influent and
C0310 27.0 mg/L 40.5 mg/L �, Daily
November 1—March 31)3 , = / v,, Composite'�,,� ° Effluent
Total Suspended Solids ,�% �. ; ' 1. Influent and
C0530 30.0 mg/L •',:45.0 mg/L ./ Daily Corriposite Effluent
(TSS)3
NH3--N interim(Summer: �•` ` A'
April 1—October 31)a C0610 2.0 mg/L\ 6.0'mg/L s. Daily Composite Effluent
NH3--N interim(Winter: — - �,
November 1 —March 31 a C0610 --;4:0,mg/L x'12 0,mg/L > -N--.„,, '\D"ally Composite Effluent
NH3 as N final(Summer: C / ,° ; \ \/ /'
(April 1—October 31)a C0610 1.6°mg'/L 4.8 mg/L `'--/' Daily Composite Effluent
NH3 as N final(Winter: ,: \ 1,----
November 1—March"31)'4 C0610o'x,3.7 mgIL `e:1,1 1 \mgIL . Daily Composite Effluent
Dissolved Oxygen /--------c.„ 00300 , C_,Daily Average 5'5.0,mg/L' Daily Grab Effluent
Fecal Colifoirn 'x, �-,.. ,
`ti 31616 200/100 mL: 400/100 mL Daily Grab Effluent
(geometric mean \
Total Residual Chlorine 5\ 50060 `V'`''\ '' 28 pg/L Daily Grab Effluent
Temperature(°C) \\>\\00010 J 11 Monitor and Report Daily Grab Effluent
Conductivity(pmhos/cm) \ 00094 /1 1 Monitor and Report Daily Grab Effluent
\ . `,,�
Total Nitrogen(TN)6(mgIL) C0600 / Monitor and Report Weekly Composite Effluent
Total Phosphorus(mg/L) C0665 Monitor and Report Weekly Composite Effluent
pH 00400 Between 6.0 and 9.0 standard units Daily Grab Effluent
Total Copper interim 7 01042 Monitor and Report ' Monthly Composite Effluent
Total Copper final 7 01042 23.9 pg/L 31.0 pg/L Monthly Composite Effluent
Chronic Toxicity 6 TGP3B Quarterly Composite Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report Quarterly Composite Effluent
(mg/L)9
Effluent Pollutant Scan NC01 Monitor and Report Footnote 10 Footnote 10 Effluent
Page 5 of 16

Permit NC0031836
EFFLUENT LIMITS • MONITORING REQUIREMENTS
PARAMETER CHARACTERISTICS
Parameter Code Monthly Weekly Daily Measurement Sample i ' Sample'
• Average Average Maximum `Frequency • Type Location 2
Total Hardness(as CaCO3) 00900 Quarterly Grab Upstream
0-ng/L)
Dissolved Oxygen(mg/L)2 00300 Variable 2 Grab Upstream and
Downstream
Temperature(°C)2 00010 Variable 2 Grab Upstream and
,, Downstream
Conductivity(pmhos/cm)2 00094 �t/,. }`Variable 2 Grab Upstream and
Downstream
Footnotes: , \i)`-' \\\
1. The Permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system; see Section A. (9.). `\
2. Upstream = at NCSR 2316. Downstream = approximately 0.5 miles downstream'�from the outfall. Samples
shall be collected 3/week from June 1 through Sept mker.30, and collected weekly from October 1 through
May 31. The Permittee has deferred-receiving-stream sampling to the Yadkin-Pee Dee River Basin
Association by memorandum of agreement(MOA). Should'tliis MOA terminate for any reason,the Permittee
shall immediately inform the Division in-writingand immediately resume instream monitoring in accordance
with this permit. \\ e� `-. \\
3. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of the respective influent
value(85%removal). ' , ' `, )
4. The facility shall follow the-Ammonia-N compliance schedule,detailed in Section A. (5.).The Permittee shall
achieve compliance with,tl ese limitations within�two years of the permit effective date.
5. The Division shall co s der'all efflu�en TRC values reported below 50 µg/L to be in compliance with the
permit. However, the Permittee shalll continue to record,and submit all values reported by a North Carolina
certified labora ory(including'field certified) ven if these values fall below 50 pg/L.
6. Total Nitrogen'=TKN +NN03 NO+,,NO2-N;where M1TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate
Nitrogen;and NO2-N is Nitrite Nitrogen:
7. The facilityshall follow the\Copper compliance schedule detailed in Section A. (6.). The Permittee shall
achieve compliance with these limits within three years of the permit effective date. Copper shall be
monitored mo`nthly,nntil the new�limits becomeeffective.
8. Whole Effluent Toxicity will be\monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia
dubia at 55%effluent Samples shall be taken in January,April,July, and October; see Section A. (3.).
9. Effluent Total Hardness sampling should be performed in conjunction with metals sampling.
10. The Permittee shall pref rm three Effluent Pollutant Scans during the term of this permit; see Section A. (4.).
11. The Permittee shall sampletream hardness upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream.
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 6 of 16

Permit NC0031836
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 45% at 4 MGD, and 55% at 6 MGD.
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 w91--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 m "North-Carolina Phase II Chronic Whole
Effluent Toxicity Test Procedure" (Revised-December 2010)�or subsequent versions.
All toxicity testing results required as\par„of"this permit\eonc.tion will be entered on the Effluent
Discharge Monitoring Form (MR-1) for themonths in which tests\were performed, using the parameter
code TGP3S for the pass/fail results and THP3B forthe Chronic Value.Additionally, DWR Form AT-3
�follow
(original) is to be sent to theing address: ��
Attention: North Carolina Division of Water Resources
Water'Sciences Section/Aquatic Toxicology Branch
\." 1621 Mail Service Center
Raleigh,N,C\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\ hlorine'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.
Page 7 of 16

Permit NC0031836
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later
than the last day of the month following the month of the initial monitoring.
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Page 8 of 16

Permit NC0031836
A. (4.) EFFLUENT POLLUTANT SCAN (Municipal POTWs) [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: 2020, 2021, and 2022. 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 1,2-dichloroethane 32103' Bis(2-chloroethoxy)methane 34278
Chlonne(total residual,TRC) 50060 Trans-1,2-dichloroethylene ,34546 Bis(2-chloroethyl)ether 34273
Dissolved oxygen 00300 1,1-dichloroethylene ` 34501 •, Bis(2-chloroisopropyl)ether 34283
Nitrate 00620 1,2-dichloropropane,' N 34541 Bis(2-ethylhexyl)phthalate 39100
Nitrite 00615 1,3-dichloropropylene / 77163 '4-bromophenyl phenyl ether 34636
Kjeldahl nitrogen 00625 Ethylbenzene i ;' 34371 Butyl,berizyl phthalate 34292
Oil and grease 00556 Methyl bromide \ 34413 2-chloronaphthalene 34581
Phosphorus C0665 Methyl chlonde \ \34418; ., 4-chlorophenyl phenyl ether 34641
Total dissolved solids 70295 ,,Methylene chlonde \N, 34423 ' Chrysene „ss ,+ 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-tnchloroethane'` '34506 \1,2-dichlorobenzene 34536
Cadmium 401027 1,1,2-trichlotoethane /j 34511" . "\Y,3-dichlorobenzene 34566
Chromium /' 01034 `•Tnchloroethylene'\,/ 39180• -`J 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 ,7 2-chloropheno1 '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 \ Ns 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 i 4-nitrophenol 34646 Hexachlorobutadiene 39702
Volatile organic compounds: • ,I 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 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
Page 9 of 16

Permit NC0031836
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 31st 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 onhalye,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(perforin chronic Fatheakminnow testing. POTWs
performing NPDES acute Fathead Minnow testing should perform acute Ceriodaphnia testing. POTWs
performing NPDES chronic Mysid shrimp testing shoulddperform�chronic Silverside Minnow testing.
The second species toxicity test results shall be filed`cwith,the Aquatic Toxicology Branch at the
following address: \ y: '',., �,
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North Carolina Division of Water Resource Nie `�\
Water Sciences Section/Aquatic Toxicology Branch �``--,, , `�)
1621 Mail Service�.Cen r-- -,�•�'`�,� \ �`V /N- ~�.. '"'
Raleigh,North Carolina 27699=1621 \, � ,'f '`,,,,
Contact the Division's Aquatic'.Toxicol'ogy Branchat,ti919-743-8401 for guidance on conducting the
additional toxicity tests,and reporting—requirements}Results should also be summarized in Part E
(Toxicity Testing'Data)4 EPA Municipal Application Form 2A, when submitting the permit renewal
if
application to the NPDES Pen itting'TJiiit. �'
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Page 10 of 16 •

Permit NC0031836
A. (5.) SCHEDULE OF COMPLIANCE FOR AMMONIA-NITROGEN LIMITATIONS
[NCGS 143-215.1 (b)]
1. Within one (1) year from the effective day of the permit, the Permittee shall submit to the
Division of Water Resources an Action Plan, for Division approval, summarizing the strategy or
actions to be taken to achieve compliance with the final Ammonia-Nitrogen (NH3-N) limitations
listed in Sections A. (1.) and A. (2.). The plan will include specific dates for completion or
implementation of each action. ,
2. Within two (2) years from the effective date of the permit;`the Permittee shall submit a report to
the Division summarizing actions taken in accordance with the Action Plan, such as
implementation of optimization strategies for N1-13N treduction. The Permittee shall achieve
compliance with the final NH3-N limitations specified''m Sections A. (1.) and A. (2.).
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Any modifications to the schedule shall be requested to the Division atNleast ninety(90) days before the
deadline. Modifications to the schedule in excess'offour(4)months will besubject to public notice.
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Action Plan and Reports shall include the owner's name; NpDES permit numbervand Permittee contact
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person, and shall be submitted to: -'-, \\'',' .
(1) NCDEQ/Division of Water Resources-: tl N.,,,,,,, (2)�`NCDEQ/Division of Water Resources
NPDES Permitting 'a \ `-„ `,.,, M000`resville Regional Office
1617 Mail Service er , `',� '-'-;610 E,Center Ave., Suite 301
Raleigh,NC 27699-1617 �\ /7"`.--,,,Mooresville,NC 28115
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Page 11 of 16

Permit NC0031836
A. (6.) SCHEDULE OF.COMPLIANCE FOR TOTAL COPPER LIMITATIONS
[NCGS 143-215.1 (b)]
1. Within one (1) year from the effective day of the permit, the Permittee shall submit to the
Division of Water Resources an Action Plan summarizing the strategy or actions to be taken to
achieve compliance with the Total Copper limitations listed in Sections A. (1.) and A. (2.),which
includes specific dates for completion or implementation of each action. Possible actions include
identifying sources of Total Copper and evaluating source reduction alternatives.
2. Within two (2) years from the effective date of the permit,the Permittee shall submit a report to
the Division summarizing actions taken in accordance with•the Action Plan, such as results of the
source identification survey, implementing source reduction strategies, and limits on identified
industrial user dischargers. �� ` ff ,�
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3. The Permittee shall achieve compliance with Total Copper limitations specified in Sections A.
(1.) and A. (2.)within three(3)years of the effective date of this pe'rmi't:,,
Any modifications to the schedule shall be requested to the DAsion at least ninety190) days before the
deadline. Modifications to the schedule/in excess of four(4)months will be subject`topublic notice.
Action Plan and Reports shall include the\o nw ergs name, NPDES'�permit number and Permittee contact
person, and shall be submitted to:
(1) NCDEQ/Division of Water Resources (2)- 1CDEQ/Division of Water Resources
NPDES Permitting: � � , Mooresville Regional Office
1617 Mail Service,Center � 610 E Center Ave., Suite 301
Raleig✓`h,NC 27699'=1617 �` �" 'Mooresville,NC 28115
Page 12 of 16

Permit NC0031836
A. (7.) NUTRIENT REOPENER FOR HIGH ROCK LAKE [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 Division Director may reopen
this permit to implement nutrient requirements in accordance with any future TMDL, nutrient
management strategy, and/or nutrient criteria for High Rock Lake.
A. (8.) MERCURY MINIMIZATION PLAN (MMP) [NCGS'143-215.1 (b)]
The Permittee shall develop and implement a Mercury Minimization,Plan (MMP) during this permit
term. The MMP shall be developed within 180 days 'of the NPDES'Prmit 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 (http://deq:nc.gov/about/divisions/water-
resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits,'•. under NC 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. '
•
•
Page 13 of 16

Permit NC0031836
A. (9.) 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.) Signatory Requirements
• Section D. (2.) Reporting {'
• Section D. (6.) Records Retention ,,
• Section E. (5.) Monitoring Reports *., , .- \
A) °\
1. Reporting Requirements [Supersedes Section D.;(2.) and SectionnE.'`(5.) (a)1
'.
The permittee shall report discharge monitoring data electronically ung the NC DWR's Electronic
Discharge Monitoring Report(eDMR)internet application. / N A.
Monitoring results obtained during( he'preyious m th(s)`shall be summarized for each month and
submitted electronically using eDMRThe�eDMR system\allows permitted facilities to enter
monitoring data and submit DMRs electromcally using the Internet. Until such time that the state's
eDMR application is compliant with\EPAross-Media, Electronic Reporting Regulation
(CROMERR), permitte s will' be required`to submit all,discharge monitoring data to the state
electronically using/eDMR and;will be requ redjto complete`the eDMR submission by printing,
signing, and submitting\one signed, original and a copy of-the computer printed eDMR to the
following address: \ N.\\//
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NC-D-EQ,/NW /' ality Permitting Section , .
�ATTENTION '�Central Files .
"`1917 Mail ServicevCe ter v
`Raleigh,North Carolina 2769911617
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If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in ani�area where less than 10 percent of the households have broadband
access, then a temporary'vaiver 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;
Page 14 of 16 .

Permit NC0031836
• 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 EPAis 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 aswell. 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 listedin 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 eleetronrc"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 submittingmonitoring 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/divisions/water-resources/edmr
Page 15 of 16

Permit NC0031836
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.) (a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.) (b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the
following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr/' /",:„`,:
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Certification. Any person submitting an electronic DMR using the,state's eDMR system shall make
the following certification [40 CFR 122.22].: No/OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED: •, �''
"I certify, under penalty of law, that-this document.and all;attachments were prepared under my
direction or supervision in accordance with a system:designed to assure that qualified personnel
properly gather and evaluate the information,,submitted.:Based on my inquiry of the person or
persons who manage the system, or those persons"directly responsible for gathering the information,
the information submitted_is„.to the best of my knowledge and'belief true, accurate, and complete. I
am aware that there/are;signifzcant penalties for submitting\false information, including the
possibility of fines and imprisonment for knowing violati no s.'w~';