NC0020591_Draft Permit_20190624

• ROY COOPER r d�
Governor
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
June 24, 2019
Mr. Andy Smith
Director, Water Resources
City of Statesville
P.O. Box 1111
Statesville, North Carolina 28687
Subject: Draft NPDES Permit Renewal
Permit NC0020591
Third 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:
• The topographic map was updated with a correction to USGS Topo Quad El 5NW /
Shepherds, NC. Labels indicating instream monitoring locations were added.
• The system component list was revised to incorporate changes made related to the 6.0
MGD Phase I upgrade.
• Upon completion or authorized construction in 2015, the Third Creek WWTP entered the
6.0 MGD flow tier. As such, The Effluent Limitations and Monitoring Requirements for
the 4.0 MGD flow tier have been removed from the permit.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
sheets. See Sections A. (1.), A. (2.) and A. (3.).
• Regulatory citations have been added to the permit.
• Monthly monitoring for Total Monthly Flow (MG/month)has been added to the permit at
all flow tiers (6.0 MGD Phases I and II, and 8.0 MGD)to aid in calculating Total Nitrogen
and Total Phosphorus nutrient loadings.
EQ�
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617Mail Service Center I Raleigh,North Carolina 27699-1617
919.707.3601

• The NC 2007-2014 Water Quality Standard Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6,2016 with some exceptions.The NC
Division of Water Resources NPDES Permitting Unit is required to implement the new
dissolved metal standards in all permits public noticed after April 6, 2016. The new
standards for most metals include acute standards. Further, the freshwater standards for
several metals are expressed as the dissolved form of the metals, and seven metals have
hardness-dependent equations. As a result, the NPDES Permitting Unit will need site-
specific effluent hardness data and instream hardness data, upstream of the discharge, for
each facility monitoring these metals in order to calculate permit limitations. Effluent
hardness and instream hardness sampling, upstream of the discharge, have been added to
the permit at a quarterly monitoring frequency. See Sections A. (1.), A. (2.) and A. (3.)—
Effluent Limitations and Monitoring Requirements, and Section A. (4.) — Instream
Monitoring Requirements.
• Based on reasonable potential analysis(RPA)showing reasonable potential to violate state
water quality standards, total copper limits have been added to the permit at all flow tiers
and the quarterly monitoring requirements have been changed to monthly monitoring[See
A. (1.), A. (2.) and A. (3.)].
• The City of Statesville reported Total Silver, at less than detection, with detection levels<
0.5 µg/L in the DMR results and<5 in three Effluent Pollutant Scans.The City's allowable
discharge concentrations are 0.14/1.48 µg/L (chronic/acute) at 6.0 MGD, and 0.12/1.35
µg/L (chronic/acute) at 8.0 MGD for Total Silver. DWR's laboratory identifies the target
Practical Quantification Limit (PQL) for Total Silver as 1.0 µg/L. 15A NCAC 2B
.0505(e)(4) requires that all test procedures must produce detection and reporting levels
that are below the permit discharge requirements and all data generated must be reported
to the approved detection level or lower reporting level of the procedure. If no approved
methods are capable of achieving a detection level below the permit discharge requirement
(or allowable discharge concentration)the method with the lowest detection level must be
used. The City should use sufficiently sensitive test methods for all pollutants, including
when performing Effluent Pollutant Scans. Quarterly monitoring for Total Silver has been
removed from the permit, but will be maintained through the City's pretreatment Long
Term Monitoring Plan (LTMP). Should Total Silver be removed from the City's LTMP,
NPDES may find it necessary to add it to the permit.
• Based on RPA showing no reasonable potential to violate state water quality standards,the
monitoring requirement for zinc has been removed from the permit at all flow tiers [See A.
(1), A. (2.), and A. (3.)].
• Based on RPA showing reasonable potential to violate EPA nationally recommended water
quality criteria,Bis(2-ethylhexyl)phthalate limits have been added to the permit at all flow
tiers and the quarterly monitoring requirements have been changed to monthly monitoring
[See A. (1.), A. (2.) and A. (3.)].
Page 2 of 4

• To provide an opportunity for the City to develop a plan to assess sources of Total Copper
and Bis(2-ethylhexyl)phthalate in order to come in compliance with the limits in Sections
A. (1.) and A. (2.), a 3-year schedule of compliance has been added to the permit [See
Special Condition A.(10.)Schedule of Compliance for Total Copper and Bis(2-ethylhexyl)
phthalate Limitations].
• Based on Mercury TMDL evaluation showing mercury values reported at levels > 1
ng/L and since the permitted flow is greater than 2 MGD, Special Condition A. (11.)
Mercury Minimization Plan has been added to the permit.
• Based on DWR Instream Fecal Coliform Monitoring Guidance, since the facility
discharges to waters that are neither impaired for fecal coliform nor Class B waters, fecal
coliform has been removed from instream monitoring requirements [See A. (4.)]. In
addition, a review of effluent data showed coliform counts to be much lower on average
g
than those instream.
• Some of the wording has changed in Section A. (5.) — Chronic Toxicity Permit Limit;
please review each paragraph carefully.
• Section A. (6.) — Effluent Pollutant Scan has been modified to include the specific three
years in which the Effluent Pollutant Scans shall beperformed(2021, 2022, and 2023 . In
)
addition,at the end of the Section,2nd species Toxicity Testing Requirements for municipal
permit renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added.
• Section A. (8.) — Compliance Schedule for nutrient limitations has been modified by
removing text related to 6.0 MGD Phase I as that portion of system upgrade has been
completed on October 29, 2015. The schedule was further modified to extend the
compliance date to October 2027 per agreement with the City on April 19, 2018.
• 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 Special Condition A.
(12.)].
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.
Page 3 of 4

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,
IS-14716741
Gary Perlmutter, Environmental Specialist II
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR/Operator Certification Unit/Maureen Kinney
DWR/Aquatic Toxicology Branch/Susan Meadows
DWR/Ecosystems Branch/Mark Vander Bourgh
DWR/Mooresville Regional Office/Water Quality Operations
Scott Austin, City of Statesville(ORC)
Forrest Westall, Sr., McGill Associates (consultant)
Joel Whitford, McGill Associates (consultant)
Page 4 of 4

Permit NC0020591
• 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 provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended, the
City of Statesville
is hereby authorized to discharge wastewater from a facility located at the
Third Creek WWTP
444 Third Creek Road
Statesville, NC 28677
Iredell County
to receiving waters designated as Third Creek in the Yadkin-Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV
hereof
This permit shall become effective Month xx. 201 Q.
This permit and authorization to discharge shall expire at midnight on March 31, 2024.
Signed this day Month xx, 2019.
DRAFT
Linda Culpepper, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0020591
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 Statesville is hereby authorized to:
1. Continue to operate an existing 6.0 MGD, Phase I wastewater treatment system consisting of the
following:
• Mechanical bar screens with washer/compactor and conveyor
• Influent pump station
• Dual grit vortex removal systems
• Aerobic reactor flow splitter box
• Dual train oxidation ditch biological nutrient removal system with each train consisting
of three anaerobic basins, each with an anoxic basin equipped with a mixer, and an
aerobic oxidation ditch
• Clarifier flow splitter box
• Two clarifiers
• RAS/WAS pump station
• Chlorination
• De-chlorination using sodium bisulfate
• Post aeration basin
• Two aerobic digesters
• Sludge pump station
The facility is located at the Statesville Wastewater Treatment Plant, 444 Third Creek Road,
Statesville, in Iredell County;
2. After receiving an Authorization to Construct from the Division followed by submittal of an
Engineer's Certificate once construction has completed, construct and operate facilities giving the
system an expanded Phase II treatment capacity of 6.0 MGD;
3. After receiving an Authorization to Construct from the Division followed by submittal of an
Engineer's Certificate once construction has completed, construct and operate facilities giving the
system a treatment capacity of 8.0 MGD; and
4. Discharge from said treatment works at the location specified on the attached map into Third Creek,
classified C waters in the Yadkin-Pee Dee River Basin.
Page 2 of 18

Permit NC0020591
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS(6.0 MGD,Phase
I: Interim Nutrient Limitations) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning on the effective date and lasting until completion of 6.0 MGD Phase II expansion (and
receipt of the Engineer's Certification of completion) or 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 CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Type Sample
Parameter Code Average Average Maximum Frequency Location
Flow 50050 6.0 MGD Continuous RecordingInfluent or
Effluent
Total Monthly Flow(MG/mo) 82220 Monitor and Report Monthly Recording or Influent or
Calculated Effluent
BOD,5-day,20°C Summer Influent and
(Apr 1 Oct 31)2 12.0 mg/L 18.0 mg/L Daily Composite Effluent
C0310
BOD,5-day,20°C Winter 24.0 mg/L 36.0 mg/L DailyComposite Influent and
g g p
(Nov 1 -Mar 31)2 Effluent
Total Suspended Solids(TSS)2 C0530 30.0 mg/L 45.0 mg/L Daily Composite Influent and
Effluent
Ammonia(NH3-N)Summer 2.1 mg/L 6.3 mg/L Daily Composite Effluent
(Apr 1 -Oct 31)
C0610
Ammonia(NH3-N)Winter 4.7 mg/L 14.1 mg/L Daily Composite Effluent
(Nov 1 -Mar 31)
Dissolved Oxygen(DO) 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(TRC)3 50060 28.0 µg/L Daily Grab Effluent
Temperature(°C) 00010 Monitor and Report Daily Grab Effluent
Conductivity(pmhos/cm) 00094 Monitor and Report Daily Grab Effluent
TKN(mg/L)4 00625 Monitor and Report Weekly Composite Effluent
NO3-N+NO2-N(mg/L)4 00630 Monitor and Report Weekly Composite Effluent
Total Nitrogen(TN)(mg/L)4 C0600 Monitor and Report Weekly Composite Effluent
TN Loads QM600 Monitor and Report(Ib/mo) Monthly Calculated Effluent
QY600 182,650 lb/yr Annually
Total Phosphorus(TP)(mg/L) C0665 Monitor and Report Weekly Composite Effluent
TP Loads QM665 Monitor and Report(lb/mo) Monthly Calculated Effluent
QY665 36,530 lb/yr Annually
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab Effluent
Chronic Toxicity 6 TGP3B Quarterly Composite Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report Quarterly Composite Effluent
(mg/L)7
Page 3 of 18

Permit NC0020591
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample
Parameter Code Average Average Maximum Frequency Sam•ple Type Location
Total Copper 7 8 01042 28.3 µg/L 35.9 µg/L Monthly Composite Effluent
Bis(2-ethylhexyl)phthalate 8 39100 2.6 µg/L Monthly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 9 Footnote 9 Effluent
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See Section
A. (12.).
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value(85%removal).
3. The facility shall monitor TRC when using chlorination for disinfection. 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.
4. TN=TKN+NO3-N+NO2-N,where TKN is Total Kjeldahl Nitrogen,NO3-N is Nitrate Nitrogen,and NO2-g $ �
2
N is Nitrite Nitrogen.
5. Compliance with this limit shall be determined in accordance with Special Condition A. (7.)of this permit,
Calculation of Total Nitrogen or Total Pho
sphorus horus Loads.
g P
6. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia dubia
at 41%effluent. Samples shall be taken in January,April,July and October; see Section A.(5.).
7. Effluent Hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium,copper,lead,nickel, silver,zinc).
8. The Permittee shall follow the compliance schedule detailed in Section A. (10.).The Permittee shall achieve
compliance with these limits within three years of the effective permit date.
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Section A.(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 18

Permit NC0020591
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (6.0 MGD,Phase
II: Final Nutrient Limitations) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon completion of 6.0 MGD, Phase II expansion and lasting until expansion to 8.0
MGD (and receipt of the Engineer's Certification of completion) or 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 CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location
Flow 50050 6.0 MGD Continuous RecordingInfluent or
Effluent
Total Monthly Flow(MG/mo) 82220 Monitor and Report Monthly Recording or Influent or
Calculated Effluent
BOD,5-day,20°C Summer Influent and
(Apr Oct 31)2 12.0 mg/L 18.0 mg/L Daily Composite Effluent
C0310
BOD,5-day,20°C Winter 24.0 mg/Lmg/LDaily 36.0 Composite osite Influent and
(Nov 1 -Mar 31)2Effluent
Total Suspended Solids(TSS)2 C0530 30.0 mg/L 45.0 mg/L Daily Composite Influent and
Effluent
Ammonia(NH3-N)Summer 2.1 mg/L 6.3 mg/L Daily Composite Effluent
(Apr 1 -Oct 31)
C0610
Ammonia(NH3 N)Winter 4.7 mg/L 14.1 mg/L Daily Composite Effluent
(Nov 1 -Mar 31)
Dissolved Oxygen(DO) 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(TRC)3 50060 28.0 µg/L Daily Grab Effluent
Temperature(°C) 00010 Monitor and Report Daily Grab Effluent
Conductivity(pmhos/cm) 00094 Monitor and Report Daily Grab Effluent
TKN(mg/L)a 00625 Monitor and Report Weekly Composite Effluent
NO3-N+NO2-N(mg/L)a 00630 Monitor and Report Weekly Composite Effluent
Total Nitrogen(TN)(mg/L)a C0600 Monitor and Report Weekly Composite Effluent
TN Loads QM600 Monitor and Report(Ib/mo) Monthly Calculated Effluent
QY600 76,321 lb/yr(effective October 1,2027) Annually
Total Phosphorus(TP)(mg/L) C0665 Monitor and Report Weekly Composite Effluent
TP Load 6 QM665 Monitor and Report(lb/mo) Monthly Calculated Effluent
QM665 15,768 lb/yr(effective October 1,2027) Annually
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab Effluent
Chronic Toxicity 6 TGP3B Quarterly Composite Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report QuarterlyComp osite Effluent
(mg/L)7 p p
Total Copper 7.6 01042 28.3 µg/L 35.9 µg/L Monthly Composite Effluent
Page 5 of 18

Permit NC0020591
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location
Bis(2-ethylhexyl)phthalate 8 39100 2.6 µg/L Monthly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 9 Footnote 9 Effluent
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Section A.(12.).
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective
influent value(85%removal).
3. The facility shall monitor TRC when using chlorination for disinfection.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.
4. TN=TKN+NO3-N+NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate Nitrogen, and
NO2-N is Nitrite Nitrogen.
5. Compliance with this limit shall be determined in accordance with Special Condition A.(7.)of this
permit,Calculation of Total Nitrogen or Total Phosphorus Loads.
6. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia
dubia at 41%effluent. Samples shall be taken in January, April,July and October; see Section A.(5.).
7. Effluent Hardness sampling should be performed in conjunction with testing for hardness dependent
metals(cadmium, copper,lead,nickel, silver, zinc).
8. The Permittee shall follow the compliance schedule detailed in Section A. (10.). The Permittee shall
achieve compliance with these limits within three years of the effective permit date.
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Section A.
(6.).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 6 of 18

Permit NC0020591
A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (8.0 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
a. Beginning upon expansion to 8.0 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 CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Weekly Daily Measurement Sample Sample
Parameter Code Average Average Maximum Frequency Type Location
Flow 50050 8.0 MGD Continuous Recording Influent or
Effluent
Total Monthly Flow(MG/mo) 82220 Monitor and Report Monthly Recording or Influent or
Calculated Effluent
BOD, 5-day, 20°C Summer Influent and
(Apr 1 Oct 31)2 12.0 mg/L 18.0 mg/L Daily Composite Effluent
C0310
BOD, 5-day, 20°C Winter 24.0 mg/L 36.0 mg/L Daily Composite Influent and
(Nov 1 -Mar 31) Effluent
Total Suspended Solids(TSS)2 C0530 30.0 mg/L 45.0 mg/L Daily Composite Influent and
Effluent
Ammonia(NH3-N)Summer 1.7 mg/L 5.1 mg/L Daily Composite Effluent
(Apr 1 -Oct 31)
C0610
Ammonia(NH3-N)Winter 4.1 mg/L 12.3 mg/L Daily Composite Effluent
(Nov 1 -Mar 31)
Dissolved Oxygen (DO) 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(TRC)3 50060 28.0 µg/L Daily Grab Effluent
Temperature(°C) 00010 Monitor and Report Daily Grab Effluent
Conductivity(pmhos/cm) 00094 Monitor and Report Daily Grab Effluent
TKN(mg/L)4 00625 Monitor and Report Weekly Composite Effluent
+ 4
NO3-N NO2-N (mg/L) 00630 Monitor and Report Weekly Composite Effluent
Total Nitrogen (TN)(mg/L)4 C0600 Monitor and Report Weekly Composite Effluent
TN Load 6 QM600 Monitor and Report(Ib/mo) Monthly Calculated Effluent
QY600 76,321 lb/yr Annually
Total Phosphorus(TP)(mg/L) C0665 Monitor and Report Weekly Composite Effluent
TP Loads QM665 Monitor and Report(lb/mo) Monthly Calculated Effluent
QM665 15,768 lb/yr Annually
pH 00400 Between 6.0 and 9.0 Standard Units Daily Grab Effluent
Chronic Toxicity 6 TGP3B Quarterly Composite Effluent
Total Hardness(as CaCO3) 00900 Monitor and Report QuarterlyComp osite Effluent
(mg/L)7 p P
Total Copper 7 01042 24.8 µg/L 32.0 µg/L Monthly Composite Effluent
Page 7 of 18

Permit NC0020591
LIMITS MONITORING REQUIREMENTS
EFFLUENT CHARACTERISTICS Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location
Bis(2-ethylhexyl)phthalate 39100 2.0 µg/L Monthly Composite Effluent
Effluent Pollutant Scan NC01 Monitor and Report Footnote 8 Footnote 8 Effluent
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Section A.(12.).
2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective
influent value(85%removal).
3. The facility shall monitor TRC when using chlorination for disinfection. 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 L.
4. TN=TKN+NO3-N+NO2-N, where TKN is Total Kjeldahl Nitrogen, NO3-N is Nitrate Nitrogen, and
NO2-N is Nitrite Nitrogen.
5. Compliance with this limit shall be determined in accordance with Special Condition A.(7.)of this
permit,Calculation of Total Nitrogen or Total Phosphorus Loads.
6. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia
dubia at 48%effluent. Samples shall be taken in January,April,July and October; see Section A. (5.).
7. Effluent Hardness sampling should be performed in conjunction with testing for hardness dependent
metals(cadmium,copper,lead,nickel, silver,zinc).
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit; see Section A.
(6.).
b. There shall be no discharge of floating solids or visible foam in
other than trace amounts.
Page 8 of 18

•
Permit NC0020591
A. (4.) INSTREAM MONITORING REQUIREMENTS [15A NCAC 02B .0200 et seq.]
a. Beginning on the effective date of this permit and lasting until the expiration date,the Permittee shall
perform instream sampling upstream and downstream of Outfall 001 as specified below:
PARAMETER MONITORING FREQUENCY Sample
SAMPLE TYPE
Parameter Code Jun 1 -Sep 30 Oct 1 -May 31 Location 1
Total Hardness(as CaCO3)(mg/L)2 00900 Surface Quarterly U
Temperature(°C) 00010 Surface 3/week Weekly U, D1, D2
Dissolved Oxygen (DO)(mg/L) 00300 Surface 3/week Weekly U, D1, D2
Conductivity(pmhos/cm) 00094 Surface 3/week Weekly U, D1, D2
Footnotes:
1. U=approximately 100 feet upstream from the outfall; D1 = 1.9 miles downstream at NCSR 2359; and D2 =3.5
miles downstream at NCSR 2362. Instream monitoring for Temperature, DO, and Conductivity is provisionally
waived in light of the Permittee's participation in the Yadkin Pee-Dee River Basin Association.Instream monitoring
shall be immediately reinstated and the Division shall be notified immediately should the Permittee end its
participation in the Association.
2. The Permittee shall sample instream Total Hardness, upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream. If the Permittee is a member of a Monitoring Coalition
Program, sampling for instream hardness may be waived as long as the Monitoring Coalition agrees to sample
hardness at the nearest upstream location, at a minimum frequency of quarterly, and the Permittee has obtained
approval from DWR - NPDES Permitting Unit that the upstream station being monitored by the Coalition is
representative of the receiving stream for this discharge. The Permittee is responsible for submitting instream
hardness test results with its permit renewal application package. If Coalition membership is cancelled or the
Coalition terminates instream hardness sampling at the approved station,the Permittee will immediately notify the
Division and resume sampling for instream hardness,upstream of its discharge.
Page 9 of 18

Permit NC0020591
A. (5.) 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 41% at 6.0 MGD(Phases I and II),and
48% at 8.0 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 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 on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed,using the parameter
code TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-
3 (original)is to be sent to the following address:
NC DEQ/ DWR
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total Residual Chlorine of the effluent toxicity sample must be measured and reported if
chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity(AT) test
form indicating the facility name,permit number,pipe number, county, and the month/year of the report
with the notation of"No Flow" in the comment area of the form. The report shall be submitted to the
Water Sciences Section at the address cited above.
Should the Permittee fail to monitor during a month in which toxicity monitoring is required,monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
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 10 of 18

•
Permit NC0020591
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.
Page 11 of 18

Permit NC0020591
A. (6.) 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: 2021, 2022, and 2023. 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) Trans-1,2-dichloroethylene Bis(2-chloroethyl)ether
Chlorine(total residual,TRC) 1,1-dichloroethylene Bis(2-chloroisopropyl)ether
Dissolved Oxygen 1,2-dichloropropane Bis(2-ethylhexyl)phthalate
Nitrate/Nitrite 1,3-dichloropropylene 4-bromophenyl phenyl ether
Kjeldahl Nitrogen(TKN) Ethylbenzene Butyl benzyl phthalate
Oil and Grease Methyl bromide 2-chloronaphthalene
Phosphorus Methyl chloride 4-chlorophenyl phenyl ether
Total Dissolved Solids Methylene chloride Chrysene
Hardness 1,1,2,2-tetrachloroethane Di-n-butyl phthalate
Antimony Tetrachloroethylene Di-n-octyl phthalate
Arsenic Toluene Dibenzo(a,h)anthracene
Beryllium 1,1,1-trichloroethane 1,2-dichlorobenzene
Cadmium 1,1,2-trichloroethane 1,3-dichlorobenzene
Chromium Trichloroethylene 1,4-dichlorobenzene
Copper Vinyl chloride 3,3-dichlorobenzidine
Lead Acid-extractable compounds: Diethyl phthalate
Mercury(EPA Method 1631 E) P-chloro-m-cresol Dimethyl phthalate
Nickel 2-chlorophenol 2,4-dinitrotoluene
Selenium 2,4-dichlorophenol 2,6-dinitrotoluene
Silver 2,4-dimethylphenol 1,2-diphenylhydrazine
Thallium 4,6-dinitro-o-cresol Fluoranthene
Zinc 2,4-dinitrophenol Fluorene
Cyanide 2-nitrophenol Hexachlorobenzene
Total Phenolic Compounds 4-nitrophenol Hexachlorobutadiene
Volatile organic compounds: Pentachlorophenol Hexachlorocyclo-pentadiene
Acrolein Phenol Hexachloroethane
Acrylonitrile 2,4,6-trichlorophenol Indeno(1,2,3-cd)pyrene
Benzene Base-neutral compounds: Isophorone
Bromoform Acenaphthene Naphthalene
Carbon tetrachloride Acenaphthylene Nitrobenzene
Chlorobenzene Anthracene N-nitrosodi-n-propylamine
Chlorodibromomethane Benzidine N-nitrosodimethylamine
Chloroethane Benzo(a)anthracene N-nitrosodiphenylamine
2-chloroethylvinyl ether Benzo(a)pyrene Phenanthrene
Chloroform 3,4 benzofluoranthene Pyrene
Dichlorobromomethane Benzo(ghi)perylene 1,2,4-tichlorobenzene
1,1-dichloroethane Benzo(k)fluoranthene
1,2-dichloroethane Bis(2-chloroethoxy)methane
Page 12 of 18

Permit NC0020591
Reporting. Test results shall be reported on DWR Form-A MR-PPA1 (or in a form approved by the
• Director) by December 31 St of each designated sampling year. The report shall be submitted to the
following address: NC DEQ / DWR / Central Files, 1617 Mail Service Center, Raleigh, North
Carolina 27699-1617.
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also
subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR 122.21(j)(5).
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 one half year period prior to the application. These tests shall be performed for acute or
chronic toxicity, whichever is specified in this permit. The multiple species toxicity test results shall be
filed with the Aquatic Toxicology Branch at the following address:
NC DEQ/DWR
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the
additional toxicity tests and reporting requirements. Results should also be summarized in Part E
(Toxicity Testing Data) of EPA Municipal Application Form 2A, when submitting the permit renewal
application to the NPDES Permitting Unit.
Page 13 of 18

Permit NC0020591
A. (7.) CALCULATION OF TOTAL NITROGEN OR TOTAL PHOSPHORUS LOADS
[NCGS 143-215.1(b)]
a. The Permittee shall calculate monthly and annual TN (or TP) 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
of the composite samples collected duringthe month;
(mg/L) p P
TMF = the Total Monthly Flow of wastewater discharged during the month
(MG/mo); and
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.
b. The Permittee shall report monthly Total Nitrogen and Total Phosphorus results (mg/L and lb/mo)
in the appropriate Discharge Monitoring Report (DMR) for each month and shall report each
calendar year's results (Ib/yr) with the December report for that year. The Effluent Nutrients
Worksheet [DWQ Form NW1(11/06)] shall be completed and submitted with the monthly DMRs,
duringeach calendaryear, identifying compliance or non-compliance with NPDES permit nutrient
� g p p
limitations.
A. (8.) SCHEDULE OF COMPLIANCE FOR PHASE II — FINAL NUTRIENT PERMIT
LIMITATIONS AT 6.0 AND 8.0 MGD [NCGS 143-215.1(b)]
The Permittee will comply with the Phase II (6 MGD) Final Nutrient effluent limitations listed in Part I,
Section A. (2.) by October 1, 2027. This timeframe provides for the addition of treatment components
for improved nutrient removal.
Any nutrient management strategy, TMDL and/or nutrient criteria developed for High Rock Lake will
override the 6.0 MGD Phase II and 8.0 MGD final nutrient effluent discharge limitations [Sections A.
(2.) and A. (3.)], and the time schedule will be adjusted to reflect the results and allocations determined
by such a strategy or TMDL. The permit may be reopened and modified accordingly.
A. (9.) PERMIT RE-OPENER: NUTRIENT LIMITS SECTION [NCGS 143-215.1(b)]
Final limits for Total Nitrogen and Total Phosphorus have been included in the 6.0 MGD Phase II-Final
Effluent Limitations and Monitoring Section A. (2.)and carried over to the 8 MGD Effluent Limitations
and Monitoring Section A. (3.). Any nutrient management strategy, TMDL and/or nutrient criteria
developed for High Rock Lake will override the Final Limits (Section A. (2.) and A. (3.)) and the
Division reserves the right to reopen this permit to include the final nutrient effluent discharge limitations
and time schedule determined by such a strategy, TMDL and/or criteria.
Page 14 of 18

Permit NC0020591
A. (10.) SCHEDULE OF COMPLIANCE FOR TOTAL COPPER AND BIS(2-
ETHYLHEXYL) PHTHALATE 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 Total Copper and Bis(2-ethylhexyl)phthalate
limitations listed in Sections A. (1.) and A. (2.). Thisplan will include specific dates for
P
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.
3. The Permittee shall achieve compliance with Total Copper and Bis(2-ethylhexyl) phthalate
limitations specified in Sections A. (1.) and A. (2.)within three(3) years of the effective date of
this permit.
Upon approval of the Action Plan 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.
Action Plan and 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 Mooresville Regional Office
1617 Mail Service Center 610 E Center Ave., Suite 301
Raleigh,NC 27699-1617 Mooresville,NC 28115
A. (11.) 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 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 (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 15 of 18

Permit NC0020591
A. (12.) 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 Section supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
The Permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the state's
eDMR application is compliant with EPA's Cross-Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the
following address:
NC DE /DWR/Water QualityPermit
ting Section
Attn: Central Files
1617 Mail Service Center
Raleigh,NC 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access, then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms(MR 1, 1.1,2,3)or alternative
forms approved by the Director. Duplicate signed copies shall be submitted to the mailing address
above. See"How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following
the i ssuance of the permit or in the case of a new facility, on the last dayof the month followingthe
commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 16 of 18

Permit NC0020591
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act(CWA) Section 316(b)Annual Reports.
The Permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the Permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program)that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for
each type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
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/abouticlivisions/water-resourcesiedmr
Page 17 of 18

Permit NC0020591
4. Sii natory 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 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.)l
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 18 of 18

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City of Statesville/Third Creek VWVTP Facility
NPDES Permit No. NC0020591 Location
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not to scale
Receiving Stream: Third Creek USGS Quad: El 5NW/Shepherds, NC
Stream Classification: C Subbasin: 03-07-06
River Basin: Yadkin-Pee Dee 8-Digit HUC: 03040102 N Latitude: 35°44'17" Iredell County
Longitude: 80°50'28"