NC0023884_Permit (Issuance)_20220606

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Ms. Sonja Basinger
Environmental Services Manager
City of Salisbury
1915 Grubb Ferry Road
Salisbury, North Carolina 28144
Dear Ms. Basinger:
NORTH CAROLINA
Environmental Quality
June 6, 2022
Subject: Final NPDES Permit Renewal
Permit NC0023884
Salisbury WWTP
Rowan County
Grade IV Biological WPCS
SIC Code 4952
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between
North Carolina and the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently
amended).
The following changes were made to the second draft permit sent to you on April 19, 2022:
• The permit expiration date was extended to June 30, 2027 to better cover the five-year permit term.
Accordingly, the three years to sample for Effluent Pollutant Scan have been adjusted to 2024,
2025, and 2026.
• The system component list in the Supplement to Cover Sheet has been updated to reflect plant
upgrades communicated by the Permittee.
• The effective date for effluent Conductivity monitoring has been delayed six months to allow the
Permittee to acquire equipment and lab certification [See A. (1.)].
• Instream Conductivity monitoring was added to the permit in agreement with the Fact Sheet, based
on 15A NCAC 02B .0500 [See A. (1.) and A. (2.)].
• Footnotes in the Instream Monitoring section have been modified to clarify the waiver as member
of monitoring coalition for all parameters except Hardness. [See A. (3.)].
Attached is a listing of comments received and Division responses in the form of a Fact Sheet Addendum.
The following changes were made to the draft permit sent to you on April 8, 2020 as a second draft
permit sent to you on April 19, 2022:
• A special condition to monitor PFAS chemicals 2/year has been added to the permit, to be effective
six (6) months after EPA has a final wastewater method in 40 CFR 136 published in the Federal
Register [See A. (10.)].
1:/_E
NORTH CAROLINA
Department of Environmental Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
• Based on 15A NCAC 2B .0500 — Surface Water Monitoring: Reporting, Total Nitrogen and Total
Phosphorus monitoring has been reduced from weekly to monthly at both flow tiers [See A. (1.)
and A. (2.)].
• Based on 15A NCAC 2B .0500 — Surface Water Monitoring: Reporting, and that the facility
receives industrial discharges via a pretreatment program, effluent and instream monitoring of
Conductivity has been added to the permit [See A. (1.) through A. (3.)].
• The Latitude and longitudinal coordinates for the outfall have been corrected on the permit map.
This final permit maintains the following significant changes identified in the letter sent on April 8,
2020:
• Since the UV system and two trickling filter units are no longer in use, they have been removed
from the facility components list.
• Regulatory citations have been added to the permit.
• Based on NPDES guidance regarding the reduction of monitoring frequencies in NPDES permits
for exceptionally performing facilities, monitoring requirements for BOD5, NH3-N, and TSS have
been maintained at twice per week at the 12.5 MGD flow tier [See A.(1.)].
• The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Committee (EMC) on November 13, 2014. The US EPA subsequently
approved the WQS revisions on April 6, 2016 with some exceptions. The NC Division of Water
Resources NPDES Permitting Unit is required to implement the new dissolved metal standards in
all permits public noticed after April 6, 2016. The new standards for most metals include acute
standards. Further, the freshwater standards for several metals are expressed as the dissolved form
of the metals, and seven metals have hardness -dependent equations. As a result, the NPDES
Permitting Unit will need site -specific effluent hardness data and instream hardness data, upstream
of the discharge, for each facility monitoring these metals in order to calculate permit limitations.
Effluent hardness and instream hardness sampling, upstream of the discharge, have been added to
the permit at a monitoring frequency of quarterly [See A. (1.) through A. (3.)].
• Some of the wording has changed in Special Condition A. (4.), Chronic Toxicity Permit Limit, to
include both 12.5 and 20.0 MGD flow tiers and to allow for electronic submittal of test results. As
a result, the special condition for Chronic Toxicity Permit Limit at 20 MGD has been removed
from the permit. Please review each paragraph carefully of the combined special condition
carefully.
• Special Condition A. (6.) has been modified to update the specific three years in which the Effluent
Pollutant Scan shall be performed. In addition, some of the wording has changed to allow for
electronic submittal of effluent pollutant scans and second species toxicity results. Please read each
paragraph carefully.
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements,
Instream Monitoring Requirements, and the Effluent Pollutant Scans special conditions [See A. (1.)
through A. (3.), and A. (6.)].
• Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
program reports. The requirement to continue reporting discharge monitoring data electronically
using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application has
been added to your NPDES permit [See A. (7.)].
• Based on Mercury TMDL evaluation showing mercury values reported at levels > 1 ng/L and since
the permitted flow is greater than 2 MGD, wording in the Mercury Minimization Plan special
condition has been changed toward plan's maintenance [See A. (8)].
• In accordance with the North Carolina Mercury TMDL, all mercury samples shall be analyzed
using EPA Method 1631E (or subsequent low-level mercury methods approved by the EPA in 40
CFR 136), including quarterly monitoring for pretreatment Long Term Monitoring Program and
Effluent Pollutant Scans.
£D_E
NORTH CAROLINA
Department of Environmental Duel
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
• Special Condition A. (9.) Nutrient Reopener for High Rock Lake has been modified to include
possible nutrient criteria.
• The map has been modified to show the instream sampling locations as well as the locations of
Grants Creek and Towns Creek WWTTs.
Pretreatment updates in response to NPDES permit renewal:
• On December 28, 2022, 180 days after the effective date of this NPDES permit renewal, the Town
of Ramseur is required to submit to the Division a written technical evaluation of the need to revise
local limits (i.e., an updated IWS/HWA-AT/L-STMP, or documentation of why is not needed).
This action may include revising, updating, or adding to the list of SIUs regardless of timeframe.
o Submit the updated Short -Term Monitoring Plan (STMP)
• Review pollutants of concern (POCs) and update the STMP to reflect pollutants in
industrial user permits (IUPs) and sludge management permit.
• The specific PFAS parameters are to be determined upon EPA publishing a final
wastewater method in 40 CFR 136 in the Federal Register.
o As part of the local limits assessment, please submit the updated Headworks Analysis
(HWA).
If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable,
you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt
of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the
North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service
Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this decision shall be final and
binding.
The NPDES standard conditions (Parts II, III, and IV) are the same as in your current permit except that
agency and division names have been updated. The latest version is available at https://bit.ly/3k5NFaL and
can be viewed online or downloaded as a PDF file.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by the Division of Water Resources or any other Federal,
State, or Local governmental regulations.
If you have any questions concerning this permit, please contact Gary Perlmutter at [phone] or via
email at [e-mail].
Sincerely,
,-DocuSigned byy:A A1, .� I^.'' `
YVUIM. I� ,VW1kkk.L
"-C464531431644FE...
for Richard E. Rogers, Jr., Director
Division of Water Resources, NCDEQ
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR / Mooresville Regional Office / Water Quality / Cory Basinger
DWR / Operator Certification Program / Maureen Kinney
£ D_E
NORTHCAROLINA
Department of Environmental Duel
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
DWR / Ecosystems Branch / Mark Vander Borgh
DWR / Aquatic Toxicology Branch / Hanna Headrick
DWR / Public Water Supply / Clinton Cook
City of Salisbury / Salisbury WWTP
Southern Environmental Law Center / Jean Zhuang
£D_E
NORTH CAROLINA
Department of Environmental Dual
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Salisbury WWTP
2"d Draft Fact Sheet Addendum NC0023884
Draft of the Salisbury WWTP NPDES Permit (NC0023884) was sent for public comment period, noticed
April 10, 2020. Comments were received and responded to in the form of a second draft that was sent
for public comment period, notice April 21, 2022. Comments were received by DWR-Aquatic Toxicity
Branch (ATB), the Permittee, and SELC.
Comment from Zachary Thomas, DWR-ATB and DWR responses:
Comment: The ATB contact cc'd in the cover letter needs to be updated.
Response: Corrected.
Comment: Please confirm that Permittee is responsible for submitting the AtC/Engineering
Certificate before operating under 20 MGD requirements.
Response: This is noted in the Supplement to Cover Sheet (Item 4) and in Section A. (1.)(a.).
Comments from Sonja Bassinger (Permittee) and DWR responses:
Comment: The City requests extension of the permit expiration date to June 30, 2027, for a five-year
permit term.
Response: Extension granted.
Comment: The City requests changes to be made to the Grant Creek WWTT to reflect current pant
upgrades.
Response: Corrections made.
Comment: The City requests a four -month extension of permit effective date for effluent
Conductivity monitoring to allow the City to acquire equipment and certification.
Response: The effective date has been delayed six months.
Comment: The City requests clarification of instream monitoring parameters and the waiver of
instream monitoring as a member of the monitoring coalition.
Response: The parameter list was reviewed; Conductivity was added, and Fecal Coliform was
confirmed it is not necessary and not added. The footnotes were revised to clarify which
parameters (all but Hardness) are waived.
Comment: The City requests monitoring for WET testing be reduced from quarterly to two times per
year based upon (1) past compliance history and (2) low IWC.
Response: WET testing is a screening test for all toxicants in the effluent, and quarterly sampling is
needed to account for seasonal differences in effluent quality. Further, 15A NCAC 2B .0508 states
that toxicity testing frequency will be defined as a minimum of quarterly (footnote **):
"**Specific test type, conditions, and limitations will be defined by permit. Toxicity limits will be
applied to all major discharges and all discharges of complex wastewater. Toxicity limitations and
monitoring requirements may be applied to permits for other discharges when, in the opinion of the
Director, such discharge may impair the best use of the receiving water by the discharge of toxic
substances in toxic amounts. Specific frequency will be defined by individual permit conditions.
Page 1 of 2

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Salisbury WWTP
2nd Draft Fact Sheet Addendum NC0023884
For most facilities with continuous and regularly occurring discharges, frequency will be defined as a
minimum of quarterly."
Comment: The City suggests corrections to be made to the Fact Sheet:
• Permitted industrial flow is 1.0518 MGD
• Number of Sills is 7
• Number of effluent pollutant scans submitted is 4
Response: Corrections made.
Comments from SELC and DWR responses:
Comment: Recommend stating in the final documents that "The permittee has no permit shield for
the discharge of PFAS compounds because no such chemicals were disclosed in the permit
application or otherwise."
Response: Comment noted.
Comment: "DEQ must look beyond PFOA and PFOS when addressing PFAS in NPDES permitting and,
at the very least, begin applying EPA's draft analytical method 1633—which EPA has already begun
applying."
Response: Comment noted. Currently the only regulated PFAS chemicals are PFOA and PFOS via a
Health Advisory Level, and currently there is no multilaboratory-validated method yet published in
the Federal Register. The current approach is appropriate.
Page 2 of 2

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
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 Salisbury
is hereby authorized to discharge wastewater from the facilities located at the
City of Salisbury WWTP
1915 Grubb Ferry Road
Salisbury
Rowan County
and
850 Heiligtown Road
East Spencer
Rowan County
to receiving waters designated as the Yadkin River in the Yadkin -Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I, II, III,
and IV hereof.
The permit shall become effective July 1, 2022.
This permit and the authorization to discharge shall expire at midnight on June 30, 2027.
Signed this day June 6, 2022.
ADocuSigned byy:p w' ^ In.' I A
I VCR Y ithOtbC�1 th
C464531431644FE...
for Richard E. Rogers, Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
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 Salisbury is hereby authorized to:
1. Continue to operate and maintain the existing 7.5 MGD Grant Creek Wastewater Treatment Train consisting of
➢ Influent pump station
➢ Two (2) mechanical bar screens
➢ One (1) manual bar screen
➢ Two (2) mechanical vortex grit removal units
➢ Two (2) 620,000-gallon flow equalization basins
➢ Aeration basin with mechanical floating aerators and mixers
➢ Two (2) circular clarifiers and two rectangular clarifiers
➢ Four (4) primary clarifiers
➢ RAS & WAS pump station
➢ Four (4) aerobic digesters
➢ Chlorine contact basin with liquid chlorine disinfection
➢ Belt filter press
➢ Standby power generator
➢ Effluent pump station
➢ Flow measurement instrumentation
This treatment train is located on Grubb Ferry Road near Spencer in Rowan County.
2. Continue to operate and maintain the existing 5.0 MGD Town Creek Wastewater Treatment Train consisting
of:
➢ Two mechanical bar screens
➢ Two grit and grease removal units
➢ Two aeration basins with fixed mechanical aerators and mixers
➢ Two secondary clarifiers
➢ Screw pump lift station
➢ Two aerobic digesters
➢ Chlorine contact basin with liquid chlorine disinfection
➢ Standby power generator
➢ Flow measurement instrumentation
➢ Belt filter press
➢ Effluent pump station
This treatment train is located on Heiligtown Road near East Spencer in Rowan County.
3. Continue to operate and maintain a dechlorination system, cascade post aerator, Parshall flume, effluent
sampling station, standby power generator and diffuser at the Yadkin River Wastewater Treatment Train.
4. After receiving an Authorization to Construct and from the Division, construct a 20.0 MGD wastewater
treatment system; and after the Division receives the Engineer Certification of construction completion, operate
above system.
5. Discharge from the City of Salisbury WWTP at the location specified on the attached map via outfall 001 into
the Yadkin River, currently classified WS-V waters in the Yadkin -Pee Dee River Basin.
Page 2 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (12.5 MGD)
[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 of the permit and lasting until expansion to 20.0 MGD and receipt
of Engineer Certificate, 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
Parameter Code
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location2
Flow
50050
12.5 MGD 3
Continuous
RecordingInfluent
or
Effluent
BOD, 5 day, 20 °C
(Apr 1 to Oct 31)4
C0310
15.0 m /L
g
22.5 m /L
g
2/Week 5
Com osite
p
Influent &
Effluent
BOD, 5 day, 20 °C
(Nov 1 to Mar 31) 4
30.0 mg/L
45.0 mg/L
2/Week 5
Composite
Influent &
Effluent
Total Suspended Solids
(TSS) 4
C0530
30.0 mg/L
g
45.0 mg/L
gEffluent
2/Week5
Composite
Influent &
NH3 as N
(Apr 1 to Oct 31)
C0610
6.0 mg/L
18.0 mg/L
2/Week5
Composite
Effluent
NH3 as N
(Nov 1 to Mar 31)
12.0 mg/L
35.0 mg/L
2/Week5
Composite
Effluent
Dissolved Oxygen
00300
Daily Average >_ 5 mg/L
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
31616
200/100 mL
400/100 mL
2/Week
Grab
Effluent
Temperature
00010
Monitor and Report
Daily
Grab
Effluent
pH
00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Conductivity
00094
Monitor and Report
(effective 1/1/2023)
Daily
Grab
Effluent
Total Residual Chlorine
(TRC) 6
50060
28 pg/L
DailyGrab
Effluent
Total Hardness 7
00900
Monitor and Report
Quarterly
Composite
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
C0600
Monitor and Report
Monthly
Composite
Effluent
Total Phosphorus
C0665
Monitor and Report
Monthly
Composite
Effluent
PFAS 8
various
Monitor and Report
2/year
Grab
Effluent
Chronic Toxicity 9
TGP3B
Quarterly
Composite
Effluent
Effluent Pollutant Scan
NC01
Monitor and Report
Footnote 10
Footnote 10
Effluent
Footnotes:
1. Submit discharge monitoring reports electronically using NC DWR's eDMR application system [see A. (7.)].
2. Effluent sampling location is after the Yadkin River Wastewater Treatment Train.
3. 7.5 MGD at Grant Creek WWTT; 5.0 MGD at Town Creek WWTT.
4. The monthly average effluent BOD and TSS concentrations shall not exceed 15% of the respective influent value (85%
removal). BOD and TSS removal efficiency shall be calculated by mathematically aggregating the flow, BOD and TSS
values for Grant Creek WWTT and Town Creek Wastewater WWTT [see A. (5.)].
5. Sampling 2/week must occur on any two non-consecutive days during the calendar week.
Page 3 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
6. The facility shall monitor for TRC when using chlorination for disinfection. The Division shall consider all 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 those values fall below 50
µg/L.
7. Effluent Hardness sampling should be performed in conjunction with sampling for hardness -dependent metals (cadmium,
copper, lead, nickel, silver, zinc).
8. See Special Condition A. (10.).
9. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia dubia at 5.3%
effluent. Samples shall be taken in March, June, September and December [see A. (4.)].
10. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A. (6.)].
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (20.0 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 20.0 MGD permit 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
Parameter Code
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location 2
Flow
50050
20.0 MGD
Continuous
RecordingInfluent
or
Effluent
BOD, 5 day, 20 °C
(Apr 1 to Oct 31) 3
C0310
5.0 mg/L
g
7.5 mg/L
gEffluent
DailyComposite
Influent &
BOD, 5 day, 20 °C
(Nov 1 to Mar 31) 3
10.0 mg/L
gEffluent
15.0mg/L
DailyComposite
Influent &
Total Suspended Solids
(TSS) 3
C0530
30.0 mg/L
g
45.0 mg/L
g
DailyComposite
p
Influent &
Effluent
NH3 as N
(Apr 1 to Oct 31)
C0610
1.0 mg/L
3.0 mg/L
Daily
Composite
Effluent
NH3 as N
(Nov 1 to Mar 31)
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
Dissolved Oxygen
00300
Daily Average >_ 5 mg/L
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
31616
200/100 mL
400/100 mL
Daily
Grab
Effluent
Temperature
00010
Monitor and Report
Daily
Grab
Effluent
pH
00400
Between 6.0 and 9.0 Standard Units
Daily
Grab
Effluent
Conductivity
00094
Monitor and Report
Daily
Grab
Effluent
Total Residual Chlorine
(TRC) 4
50060
28 /L
1�9
Dail Y
Grab
Effluent
Total Hardness 5
00900
Monitor and Report
Quarterly
Composite
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
C0600
Monitor and Report
Monthly
Composite
Effluent
Total Phosphorus
C0665
Monitor and Report
Monthly
Composite
Effluent
PFAS 6
various
Monitor and Report
2/year
Grab
Effluent
Chronic Toxicity'
TGP38
Quarterly
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 A. (7.)].
2. Effluent sampling location is after the Yadkin River Wastewater Treatment Train.
3. The monthly average effluent BOD and TSS concentrations shall not exceed 15% of the respective influent value (85%
removal). BOD and TSS removal efficiency shall be calculated by mathematically aggregating the flow, BOD and TSS
values for Grant Creek WWTT and Town Creek Wastewater WWTT [see A. (5.)].
4. The facility shall monitor for TRC when adding chlorine to the treatment system. The Division shall consider all 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 those values fall
below 50 µg/L.
5. Effluent Hardness sampling should be performed in conjunction with sampling for hardness -dependent metals
(cadmium, copper, lead, nickel, silver, zinc).
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DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
6. See Special Condition A. (10.).
7. Whole Effluent Toxicity shall be monitored using the Pass/Fail Chronic Toxicity test with Ceriodaphnia dubia at 4.0%
effluent. Samples shall be taken in March, June, September and December [see A. (4.)].
8. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A. (6.)].
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (3.) 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:
EFFLUENT CHARACTERISTICS
Parameter Code
MONITORING REQUIREMENTS
Measurement Frequency
Sample Type
Sample Location 1
Total Hardness, Total as
CaCO3 2
00900
Year-round
QuarterlyGrab
Upstream
Dissolved Oxygen
00300
June -September
3/week
Grab
Upstream & Downstream
October -May
1/week
pH
00400
June -September
3/week
Grab
Upstream & Downstream
October -May
1/week
Temperature
00010
June -September
3/week
Grab
Upstream & Downstream
October -May
1/week
Conductivity
00094
June -September
3/week
Grab
Upstream & Downstream
October -May
1/week
Total Phosphorus
C0665
June -September
1/month
Grab
Upstream & Downstream
NO2+NO3
00630
June -September
1/month
Grab
Upstream & Downstream
NH3 as N
C0610
June -September
1/month
Grab
Upstream & Downstream
Total Kjeldahl Nitrogen
00625
June -September
1/month
Grab
Upstream & Downstream
Chlorophyll -a
32230
June -September
1/month
Grab
Downstream
Footnotes
1. Upstream = at least 200 feet upstream of the discharge point. Downstream = 0.7 miles above Southern Railroad Bridge.
Instream monitoring for all parameters except Total Hardness is provisionally waived in light of the Permittee's
participation in the Yadkin -Pee Dee River Basin Association. Instream monitoring will 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 hardness, upstream of the facility's discharge at the Salisbury WTP River Pump
Station in the South Yadkin River. The sample shall be representative of the hardness in the receiving stream.
b. As per 15A NCAC 2B.0505 (c) (4), stream sampling may be discontinued at such time as flow
conditions in the receiving waters or extreme weather conditions will result in a substantial risk of
injury or death to persons collecting samples. In such cases, on each day that sampling is discontinued,
written justification for the discontinuance shall be specified in the monitoring report for the month in
which the event occurred. This provision shall be strictly construed and may not be utilized to avoid
the requirements of 15A NCAC 2B.0500 when performance of these requirements is attainable. When
sampling is discontinued pursuant to this provision, stream sampling shall be resumed at the first
opportunity after the risk period has ended.
Page 6 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
A. (4.) CHRONIC TOXICITY PERMIT LIMIT (Quarterly) [15A NCAC 02B .0200]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 5.3% at 12.5 MGD and 4.0% at 20.0
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
March, June, September, and December. These months signify the first month of each three-month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV
below the permit limit, then multiple -concentration testing shall be performed at a minimum, in
each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent
Toxicity Test Procedure" (Revised -December 2010, or subsequent versions).
All toxicity testing results required as part of this permit condition will be entered electronically using the
Division's eDMR system for the months in which tests were performed, using the parameter code TGP3B
for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original) is
to be sent to the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, NC 27699-1621
Or, results can be sent to the email, [e-mail].
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 7of15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival, minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later than
the last day of the month following the month of the initial monitoring.
A. (5.) AGGREGATE CALCULATION OF GRANTS CREEK AND TOWN CREEK TSS AND
BOD REMOVAL EFFICIENCY [NCGS 143-215.1(b)]
TSS WWTP Infl = (TSSGC Infl x F1owGc) + (TSSTC Infl x FlowTc)
F1owGc + F1owTc
TSS WWTP Effl = (TSSGCEffl X F10WGC) + (TSSTCEffl X F1oWTC)
F1owGc + F1owTc
TSSREMOVAL = [1 - (TSSWWTP Effl / TSSWWTP Infl)] X 100%
Notes:
"Effl" = Effluent
"Infl" = Influent
"GC" = Grant Creek Wastewater Treatment Train
"TC" = Town Creek Wastewater Treatment Train
"WWTP" = City of Salisbury WWTP
Page 8 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
A. (6.) EFFLUENT POLLUTANT SCAN [NCGS 143-215.1(b)]
The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One
scan must be performed in each of the following years: 2024, 2025, and 2026. Analytical methods shall
be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters
are present in concentrations greater than applicable standards and criteria. Samples should be collected with
one quarterly toxicity test each year, and must represent seasonal variation [i.e., do not sample in the same
quarter every year]. Unless otherwise indicated, metals shall be analyzed as "total recoverable."
Ammonia (as N)
Chlorine (total residual, TRC)
Dissolved oxygen
Nitrate / Nitrite
Kjeldahl nitrogen
Oil and grease
Phosphorus
Total dissolved solids
Hardness
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury (Method 1631E)
Nickel
Selenium
Silver
Thallium
Zinc
Cyanide
Total phenolic compounds
Volatile organic compounds:
Acrolein
Acrylonitrile
Benzene
Bromoform
Carbon tetrachloride
Chlorobenzene
Chlorodibromomethane
Chloroethane
2-chloroethyl vinyl ether
Chloroform
Dichlorobromomethane
1,1-dichloroethane
1,2-dichloroethane
C0610
50060
00300
00630
00625
00556
C0665
70295
00900
01097
01002
01012
01027
C0034
01042
01051
COMER
01067
01147
01077
01059
01092
00720
32730
34210
34215
34030
32104
32102
34301
34306
85811
34576
32106
32101
34496
32103
Trans-1,2-dichloroethylene
1,1-dichloroethylene
1,2-dichloropropane
1,3-dichloropropylene
Ethylbenzene
Methyl bromide
Methyl chloride
Methylene chloride
1,1,2,2-tetrachloroethane
Tetrachloroethylene
Toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
Trichloroethylene
Vinyl chloride
Acid -extractable compounds:
P-chloro-m-cresol
2-chlorophenol
2,4-dichlorophenol
2,4-dimethylphenol
4, 6-d i n itro-o-c reso l
2,4-dinitrophenol
2-nitrophenol
4-nitrophenol
Pentachlorophenol
Phenol
2,4,6-trichlorophenol
Base -neutral compounds:
Acenaphthene
Acenaphthylene
Anthracene
Benzidine
Benzo(a)anthracene
Benzo(a)pyrene
3,4 benzofluoranthene
Benzo(ghi)perylene
Benzo(k)fluoranthene
Bis (2-chloroethoxy) methane
34546
34501
C0541
77163
34371
34413
34418
34423
81549
34475
34010
34506
34511
39180
39175
34452
34586
34601
34606
34657
34616
34591
34646
39032
34694
34621
34205
34200
CO220
39120
C0526
34247
34230
34521
34242
34278
Bis (2-chloroethyl) ether
Bis (2-chloroisopropyl) ether
Bis (2-ethylhexyl) phthalate
4-bromophenyl phenyl ether
Butyl benzyl phthalate
2-chloronaphthalene
4-chlorophenyl phenyl ether
Chrysene
Di-n-butyl phthalate
Di-n-octyl phthalate
Dibenzo(a,h)anthracene
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
3,3-dichlorobenzidine
Diethyl phthalate
Dimethyl phthalate
2,4-dinitrotoluene
2,6-dinitrotoluene
1,2-diphenylhydrazine
Fluoranthene
Fluorene
Hexachlorobenzene
Hexachlorobutadiene
Hexachlorocyclo-pentadiene
Hexachloroethane
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
Nitrobenzene
N-nitrosodi-n-propylamine
N-nitrosodimethylamine
N-nitrosodiphenylamine
Phenanthrene
Pyrene
1,2,4-trichlorobenzene
34273
34283
C0100
34636
34292
34581
34641
34320
39110
34596
34556
34536
34566
34571
34631
34336
34341
34611
C0626
34346
C0376
34381
C0700
C0702
34386
34396
34403
34408
34696
34447
34428
34438
34433
34461
34469
C0551
Reporting. Test results shall be reported electronically using the Division's eDMR system or on DWR
Form DMR-PPA-1(or on a form approved by the Director) by December 31st of each designated sampling
year. The Permittee must at least report completion of the test in the eDMR system by entering "1" or "Y"
Page 9 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
for parameter code NC01 - Annual Pollutant Scan. If utilizing the DWR Form submit to the following
address:
NC DEQ / DWR / NPDES Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Or the form may be uploaded at: https://edocs.deq.nc.gov/Forms/NPDES_WW-EDMR-Supplemental-
Form
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. 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].
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:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Or, results can be sent to the email: [e-mail].
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 10 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
A. (7.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[NCGS 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,
2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a)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 monthly electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. The eDMR system may be
accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr.
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband
access, then a temporary waiver from the NPDES electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or alternative
forms approved by the Director. Duplicate signed copies shall be submitted to the following address:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See "How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
Page 11 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
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 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
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.1_0)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
Page 12 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
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 cert0/, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or persons
who manage the system, or those persons directly responsible for gathering the information, the
information submitted is, to the best of my knowledge and belief true, accurate, and complete. I am
aware that there are significant penalties for submitting false information, including the possibility of
fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period may be extended by request of the Director at any time [40 CFR 122.41].
Page 13 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
A. (8.) MERCURY MINIMIZATION PLAN (MMP) [NCGS 143-215. 1(b.)]
The Permittee shall maintain and continue to implement the Mercury Minimization Plan (MMP)
developed in the previous permit term. The MMP shall continue to be available for inspection on -site. 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 MMP 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 action to address the Waste Load Allocation.
A. (9.) NUTRIENT REOPENER FOR HIGH ROCK LAKE [NCGS 143-215.1(b)]
This permit may be reopened and modified to implement nutrient requirements in accordance with any
future TMDL, management strategy and/or nutrient criteria for High Rock Lake.
A. (10.) PFAS MONITORING REQUIREMENT [NCGS 143-215.1(b.)]
This reporting requirement for the per- and polyfluoroalkyl substances (PFAS) parameters listed under
Table 1 of the Final Method 1633 takes effect the first full calendar quarter following six (6) months after
EPA publishes a 40 CFR part 136 Final PFAS Method for wastewater in the Federal Register. Monitoring
will be at a frequency of 2/year.
Find the current parameters listed under Table 1 of the August 2021 Draft Method 1633 Analysis of Per -
and Polyfluoroalkyl Substances (PFAS) in Aqueous, Solid, Biosolids, and Tissue Samples by LC-MS/MS
at:
https://www.epa.gov/system/files/documents/2021-09/method 1633draftaug-2021.pdf
Page 14 of 15

DocuSign Envelope ID: C06EC292-97F1-41D2-A7A7-A27DA6170CE5
Permit NC0023884
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Receiving Stream: Yadkin River
Stream Class: WS-V
Basin(HUC: Yadkin -Pee Dee/03040103
Lat.: 35°43'38"
Long.: 80°25'28"
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Not to SCALE
Page 15 of 15