NC0023884_Draft Permit_20220419

DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
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
April 19, 2022
Subject: 2nd Draft NPDES Permit Renewal
Permit NC0023884
Salisbury WWTP
Rowan County
Grade IV Biological WPCS
SIC Code 4952
Enclosed with this letter is a copy of the second draft NPDES permit renewal for your facility.
This second draft is being sent for review and public comment in light of the addition of special
condition requiring PFAS monitoring. 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 following changes were made to the first draft permit sent to you on April 8, 2020:
• 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.)].
• 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.
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: AB73CCBE-343A-4687-96E9-B5469176A8CF
This second draft 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 BODs, 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: 2021, 2022, and 2023. 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.
• Special Condition A. (9.) Nutrient Reopener for High Rock Lake has been modified to
include possible nutrient criteria.
£D_E
NORTH CAROLINA
Department of Environmental Deal
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: AB73CCBE-343A-4687-96E9-B5469176A8CF
• The map has been modified to show the instream sampling locations as well as the locations
of Grants Creek and Towns Creek WWTTs.
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 Rowan County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after
receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments and
take appropriate action prior to issuing a final permit. If you have questions concerning this draft
permit, please call me at [phone] or by email at [e-mail].
Sincerely,
DocuSigned by:
mmtAvtle
9FBBBC952DF8455...
Gary Perlmutter, Environmental Specialist II
NPDES Complex Permitting Unit
Hardcopy: NPDES Files
eCopy: US EPA Region 4
DWR / Mooresville Regional Office / Water Quality / Cory Basinger
DWR / Operator Certification Program / Maureen Kinney
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
NORTHCAROLINA
Department of Environmental Deal
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: AB73CCBE-343A-4687-96E9-B5469176A8CF
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 Month 1, 2022.
This permit and the authorization to discharge shall expire at midnight on June 30, 2026.
Signed this day Month xx, 2022.
DRAFT
for Richard E. Rogers, Jr., Director
Division of Water Resources
By Authority of the Environmental Management Commission
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
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 Parshall flume
➢ Four mechanical bar screens
➢ Four grit chambers
> Aeration basin with mechanical floating aerators and mixers
➢ Two circular clarifiers and two rectangular clarifiers
➢ Four primary clarifiers
> Screw pump lift station
➢ Four 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.
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
A. (1.)
PART I
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 115A 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) a
C0310
15.0 mg/L
g
22.5 mg/L
gEffluent
2/Week 5
Composite
Influent &
BOD, 5 day, 20 ° C
(Nov 1 to Mar 31)
30.0 mg/L
45.0 mg/L
2/Week 5
Composite
Influent &
Effluent
Total Suspended Solids
(TSS) a
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
2lWeek
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) 6
50060
28pg/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 Toxicity9
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.
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.
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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: AB73CCBE-343A-4687-96E9-B5469176A8CF
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
Recording
Influent 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 pg/L
DailyGrab
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 7
TGP3B
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).
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.)].
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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 samnlin 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
00900
Year-round
Quarterly
Grab
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
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 DO, temperature, conductivity, and fecal coliform 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. If the
Permittee is a member of the 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.
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.
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
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.
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
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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 + FlowTc
TSS WWTP Effl = (TSSGCEffl x FlowTc) + (TSSTCEffl x F1owTC)
FlowGc + FlowTc
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
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
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: 2023, 2024, and 2025. 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 Trans-1,2-dichloroethylene
50060 1,1-dichloroethylene
00300 1,2-dichloropropane
00630 1,3-dichloropropylene
00625 Ethylbenzene
00556 Methyl bromide
C0665 Methyl chloride
70295 Methylene chloride
00900 1,1,2,2-tetrachloroethane
01097 Tetrachloroethylene
01002 Toluene
01012 1,1,1-trichloroethane
01027 1,1,2-trichloroethane
C0034 Trichloroethylene
01042 Vinyl chloride
01051 Acid -extractable compounds:
COMER P-chloro-m-cresol
01067 2-chlorophenol
01147 2,4-dichlorophenol
01077 2,4-dimethylphenol
01059 4,6-dinitro-o-cresol
01092 2,4-dinitrophenol
00720 2-nitrophenol
32730 4-nitrophenol
Pentachlorophenol
34210 Phenol
34215 2,4,6-trichlorophenol
34030 Base -neutral compounds:
32104 Acenaphthene
32102 Acenaphthylene
34301 Anthracene
34306 Benzidine
85811 Benzo(a)anthracene
34576 Benzo(a)pyrene
32106 3,4 benzofluoranthene
32101 Benzo(ghi)perylene
34496 Benzo(k)fluoranthene
32103 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 31 st of each designated sampling year. The Permittee
must at least report completion of the test in the eDMR system by entering "1" or "Y" for parameter code NC01 -
Annual Pollutant Scan. If utilizing the DWR Form submit to the following address:
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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.
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.) (all
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.
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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.
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
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DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section
B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A
person, and not a position, must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account, please visit the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
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.)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].
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.
Page 12 of 14

DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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 1633 draft aug-2021.pdf
Page 13 of 14

DocuSign Envelope ID: AB73CCBE-343A-4687-96E9-B5469176A8CF
Permit NC0023884
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Receiving Stream: Yadkin River
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Lat.: 35°43'38"
Long.: 80°25'28"
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Page 14 of 14