NC0031879_Draft Permit_20210223

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
City of Marion
Attn: Robert Boyette, City Manager
P.O. Box 700
Marion, NC 28752-0700
Dear Robert Boyette:
NORTH CAROLINA
Environmental Quality
February 23, 2021
Subject: Draft NPDES Permit Renewal
Permit NCO031879
Corpening Creek WWTP
McDowell County
Facility Grade III (2.5 MGD)/IV (3.0 MGD)
SIC 4952
Enclosed with this letter is a copy of the Draft NPDES permit renewal for the Corpening Creek
WWTP (Facility). As requested, the two flow tiers remain in effect (2.5 and 3.0 MGD), as with
the last permit cycle. Please review this draft carefully to ensure a thorough understanding of the
requirements and conditions it contains. There are few changes from the existing permit,
including the following:
• The Facility components list on the supplement to permit cover sheet (Cover Sheet) were
adjusted according to the flow process diagram provided with the permit application
renewal and inspection reports.
• Authorization language on the Cover Sheet was rearranged consistent with language
present on top of the page of Sections A. (1.) and A. (2.) of the previous permit.
• Parameter codes were included in the Effluent Limitations and Monitoring Requirements
tables. [See Sections A. (L) and A. (2.)].
• The Division is implementing dissolved metals standards in all permits, per the 2016
revisions to State water quality standards. As such, 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 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. (L) and A. (2.)].
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to
violate state water quality standards, the monitoring requirement for zinc has been removed
from the permit [See Sections A.(1) and A. (2.)].
• The City of Marion reported Total Selenium and Total Silver at less than detection, with
detection levels < 10.0 µg/L, and < 5.0 µg/L respectively, in the Effluent Pollutant Scans.
Based on the RPA, the City's allowable discharge concentrations are 8.00 µg/L and 0.096
µg/L for Total Selenium and Total Silver, respectively. DWR's laboratory identifies the
target Practical Quantification Limits (PQLs) for Total Selenium and 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
DE Q�� North Carolina Department of Environmental Quality I Division of Water Resources
_ 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA
Department men�ironmenwiQuality / 919.707.9000

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.
• An industrial waste survey (IWS) was requested by July 1, 2021. Based on DWR
Instream Conductivity Monitoring Guidance, if the Facility is discharging pretreated
industrial wastewater, instream conductivity monitoring is needed. Effluent conductivity
and instream conductivity sampling, have been added to the permit [See Sections A. (1.)
and A. (2.)]. Monitoring and reporting for conductivity will begin only if the 2021
industrial waste survey (IWS) confirms industrial sources discharging pretreated
wastewater into the Facility.
• Language has been added to Footnotes to update information about upstream and
downstream sampling locations. [See Sections A. (L) and A. (2.) Footnote 2].
• Language has been added to Footnotes to include clarification for total nitrogen sampling
requirements. [See Sections A. (L) and A. (2.), Footnote 6].
• Language has been added to Footnotes to include clarification for variable monitoring
frequency requirements. [See Sections A. (L) and A. (2.), Footnote 7].
• Language has been added to Footnotes to include information on monitoring coalition
programs. [See Sections A. (L) and A. (2.), Footnote 8].
• Special Condition A. (4.) includes the specific three years in which the Effluent Pollutant
Scan shall be performed (2023, 2024, and 2025) and the Effluent Pollutant Scan list was
updated to include the pollutant's codes.
• Special Condition A. (4.) has been modified to include requirement for proper completion
of annual pollutant scan in the eDMR system.
• A notation was made concerning the Electronic Reporting Rule — Phase 2 Extension. EPA
is proposing to extend the Phase 2 deadline from December 21, 2020, to December 21,
2025. Effective January 4, 2021, the current compliance date was extended as a final
regulation change published in the November 2, 2020, Federal Register. [See Special
Condition A. (5.)]
• Regulatory citations have been added to the permit.
August 5, 2019, City's permit renewal letter requested ammonia limits to be established at a
level that is compatible with the surrounding WWTP facilities in the area. The ammonia
limits will be the same as the previous permit cycle. The WQBELs for ammonia for
each WWTP are based on wasteload allocation (WLA) calculations for the Facility's specific
flow tiers.
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.
Concurrent with this notification, the Division is publishing a notice in a newspaper having
circulation in the general McDowell 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 2 of 3

Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit, please contact me at [phone] or by email at diana.yitbarek(c�r�,ncdenr.gov.
Sincerely,
Diana YltVarek, Engineer
NPDES Municipal Permitting Unit
Hardcopy: NPDES Files
Ecopy: Corpening Creek WWTP /Tim Horton and Robert Boyette
US EPA Region 4
DWR/Asheville Regional Office/Water Quality/Lauren Armeni and Tim Heim
DWR/Aquatic Toxicology Branch/Zach Thomas and Cindy Moore
DWR/Operator Certification Program /Maureen Kinney
Page 3 of 3

Permit NCO031879
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
DRAFT PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act, as amended, the
City of Marion
is hereby authorized to discharge treated wastewater from a facility located at the
Corpening Creek Wastewater Treatment Plant
3982 Hwy 226 South, Marion, NC
McDowell County
to receiving waters designated as the Youngs Fork (Corpening Creek) in the Catawba River Basin, in
accordance with effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts
I, II, III, and IV hereof
This permit shall become effective: Month DD, 2021.
This permit and authorization to discharge shall expire at midnight on January 31, 2026.
Signed this day: Month DD, 2020.
DRAFT
For S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0031879
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.
City of Marion is hereby authorized to
1. Continue to operate a 3.0 MGD capacity wastewater treatment facility with an approved authorization to
discharge 2.5 MGD with the following components:
• Influent pump station
• Bar screening and grit removal structures
• Two primary clarifiers, 0.40 MG each
• Two aeration basins, 0.780 MG each
• Two secondary clarifiers, 0.40 MG each
• Tertiary filters
• Chlorine contact basin and dechlorination/Sulfur dioxide structure
• Two gravity sludge thickeners, 0.065 MG each
• Aerobic digester
2. Discharge treated wastewater into the Youngs Fork (Corpening Creek), classified as C waters in the
Catawba River Basin, through outfall 001. The outfall location is specified on the attached map.
Upon reaching a calendar year annual average daily flow equal or greater than 2.0 MGD (80% of 2.5 MGD), the
Permittee is required to submit a written notification to NC DEQ confirming that compliance with the 3.0 MGD
limitation page is now in effect, provided that the facility can comply with the issued permit limits.
Page 2 of 12

Permit NCO031879
PART
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (2.5 MGD) —
OUTFALL 001 [15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade III Biological Water Pollution
Control System [15A NCAC 08G .0302]
a) Beginning on the effective date of this permit and lasting until this facility reaches an annual average
daily flow equal to or greater than 2.0 MGD (80% of 2.5 MGD) or expiration, the Permittee is
authorized to discharge from outfall 001, treated municipal wastewater. Such discharges shall be
limited and monitored' by the Permittee as specified below:
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Daily
Measurement
Sample
Sample
PARAMETER
Average
Average
Maximum
Frequency
Type
Location
Flow
50050
2.5 MGD
Continuous
Recording
I or E
BOD5 (20°C) 3
C0310
30.0 m
45.0 m
3/Week
Composite
I and E
Total Suspended Solids3
C0530
30.0 mg/L
45.0 mg/L
3/Week
Composite
I and E
Ammonia (NH3 as N)
C0610
1.5 mg/L
4.4 mg/L
3/Week
Composite
E
April I -Oct. 31
Ammonia (NH3 as N)
C0610
3.3 mg/L
9.8 mg/L
3/Week
Composite
E
Nov. 1-March 31
Conductivity",
mho/cm
00094
Monitor and Report
3/Week
Grab
E
Dissolved Oxygen,
00300
Daily Average > 5.0 mg/L
3/Week
Grab
E
m
Fecal Coliform
31616
200/100 mL
400/100 mL
3/Week
Grab
E
(Geometric Mean)
pH
00400
Between 6.0 and 9.0 standard units
3/Week
Grab
E
Total Residual Chlorine
50060
27 µg/L
3/Week
Grab
E
a
Temperature, °C
00010
Monitor and Report
3/Week
Grab
E
Total Hardness 5 [as
CaC031, m
00900
Monitor and Report
Quarterly
Composite
E
Total Nitrogen 6 (TN),
mg/L (NO2+NO3+TKN)
C0600
Monitor and Report
Monthly
Composite
E
Total Phosphorus (TP),
C0665
Monitor and Report
Monthly
Composite
E
mg/L
Total Cyanide, /L
00720
8.0 /L 33.0 /L
Monthly
Grab
E
Total Copper, µg/L
01042
Monitor and Report
Quarterly
Composite
E
Effluent Pollutant Scan9
NC01
Monitor and Report
Footnote 9
Footnote 9
E
Chronic Toxicity"
TGP3B
See Footnote 10
Quarterly
Composite
E
Conductivity",
00094
Monitor and Report
Variable u,7,8
Grab
U and D
mho/cm
Dissolved Oxygen,
00300
Monitor and Report
Variable 7,8
Grab
U and D
m
Temperature, °C
00010
Monitor and Report
Variable 7,8
Grab
U and D
Total Hardness 5 [as
CaC031, mg/L
00900
Monitor and Report
Quarterly
Grab
U
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Special Condition A. (5).
2. Sample Location: E — Effluent, I — Influent, U — Upstream about 100 feet from the outfall, D — Downstream about 200 feet
from the outfall.
3. The monthly average effluent BOD5 and total suspended solids concentrations shall not exceed 15% of the respective influent
value (85 % removal).
Page 3 of 12

Permit NC0031879
4. The Division shall consider all effluent total residual chlorine values reported below 50 ug/1 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 ug/l.
5. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent metals (cadmium,
copper, lead, nickel, silver, and zinc). The Permittee shall sample instream hardness upstream of the facility's discharge. The
sample shall be representative of the hardness in the receiving stream.
6. For a given wastewater sample, total nitrogen (TN) = TKN + NO3-N + NO2-N, where TKN is total kjeldahl nitrogen, and
NO3-N and NO2-N are nitrate and nitrite nitrogen, respectively.
7. Variable monitoring frequency is defined as follows: samples collected three times per week during June 1 through
September 30 and once per week October 1 through May 31.
8. If the Permittee is a member of a monitoring coalition program, sampling may be waived as long as the monitoring coalition
agrees to sample at a minimum frequency of quarterly, and the Permittee has obtained approval from DWR-NPDES
Permitting Unit that the location being monitored by the Coalition and the sampling is representative of the receiving stream
for this discharge. The Permittee is responsible for submitting test results with its permit renewal application package. If
Coalition membership is canceled or the Coalition terminates sampling at the approved station, the Permittee will
immediately notify the Division and resume sampling for upstream of its discharge.
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit. See Special Condition A. (4).
10. Chronic Toxicity (Ceriodaphnia) P/F A 63% February, May, August, and November. See Special Condition A. (3).
11. Optional Monitoring: Monitoring and reporting for conductivity will begin only if the 2021 industrial waste survey (IWS)
confirms industrial sources discharging pretreated wastewater into the Facility.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 12

Permit NCO031879
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (3.0 MGD) [ 15A NCAC
02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water Pollution Control System [15A NCAC 08G .0302]
a) Beginning when this facility reaches an annual average daily flow equal to or greater than 2.0 MGD and
lasting until expiration, the Permittee is authorized to discharge from outfall 001, treated municipal
wastewater. Such discharges shall be limited and monitored' by the Permittee as specified below:
EFFLUENT LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Daily
Measurement
Sample
Sample
PARAMETER
Average
Average
Maximum
Frequency
Type
Location2
Flow
50050
3.0 MGD
Continuous
Recording
I or E
BOD5 (20°C)'
C0310
30.0 m
45.0 m
Daily
Composite
I and E
Total Suspended Solids'
C0530
30.0 mg/L
45.0 mg/L
Daily
Composite
I and E
Ammonia (NFb as N)
C0610
1.4 mg/L
4.2 mg/L
Daily
Composite
E
April 1-Oct. 31
Ammonia (NH3 as N)
C0610
3.0 mg/L
9.0 mg/L
Daily
Composite
E
Nov. 1-March 31
Conductivity",
mho/cm
00094
Monitor and Report
Daily
Grab
E
Dissolved Oxygen,
00300
Daily Average > 5.0 mg/L
Daily
Grab
E
m
Fecal Coliform
31616
200/100 mL
400/100 mL
Daily
Grab
E
(Geometric Mean)
pH
00400
Between 6.0 and 9.0 standard units
Daily
Grab
E
Total Residual Chlorine
50060
25 µg/L
Daily
Grab
E
a
Temperature, °C
00010
Monitor and Report
Daily
Grab
E
Total Hardness' [as
00900
Monitor and Report
Quarterly
Composite
E
CaC031, m
Total Nitrogen 6 (TN),
C0600
Monitor and Report
Monthly
Composite
E
mg/L (NO2+NO3+TKN)
Total Phosphorus (TP),
C0665
Monitor and Report
Monthly
Composite
E
mg/L
Total Cyanide,
00720
7-5 31.1 /L
Monthly
Grab
E
Total Copper, µg/L
01042
Monitor and Report
Quarterly
Composite
E
Effluent Pollutant Scan9
NCO]
Monitor and Report
Footnote 9
Footnote 9
E
Chronic Toxicity"
TGP3B
See Footnote 10
Footnote 10
Footnote 10
E
Conductivity",
mho/cm
00094
Monitor and Report
Variable u,7°8
Grab
U and D
Dissolved Oxygen,
00300
Monitor and Report
Variable 7°8
Grab
U and D
m
Temperature, °C
00010
Monitor and Report
Variable 7,8
Grab
U and D
Total Hardness 5 [as
00900
Monitor and Report
Quarterly
Grab
U
CaC031, m
Footnotes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application system. See
Special Condition A. (5).
2. Sample Location: E — Effluent, I — Influent, U — Upstream about 100 feet from the outfall, D — Downstream about 200 feet
from the outfall.
3. The monthly average effluent BOD5 and total suspended solids concentrations shall not exceed 15% of the respective influent
value (85 % removal).
4. The Division shall consider all effluent total residual chlorine values reported below 50 ug/1 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 ug/L
5. Effluent Total Hardness sampling shall be performed in conjunction with testing for hardness -dependent metals (cadmium,
copper, lead, nickel, silver, and zinc). The Permittee shall sample instream hardness upstream of the facility's discharge. The
sample shall be representative of the hardness in the receiving stream.
Page 5 of 12

Permit NC0031879
6. For a given wastewater sample, total nitrogen (TN) = TKN + NO3-N + NOz-N, where TKN is total kjeldahl nitrogen, and
NO3-N and NO2-N are nitrate and nitrite nitrogen, respectively.
7. Variable monitoring frequency is defined as follows: samples collected three times per week during June 1 through
September 30 and once per week October 1 through May 31.
8. If the Permiee is a member of a monitoring coalition program, sampling may be waived as long as the monitoring coalition
agrees to sample at a minimum frequency of quarterly, and the Permiee has obtained approval from DWR-NPDES
Permitting Unit that the location being monitored by the Coalition and the sampling is representative of the receiving stream
for this discharge. The Permiee is responsible for submitting test results with its permit renewal application package. If
Coalition membership is canceled or the Coalition terminates sampling at the approved station, the Permiee will
immediately notify the Division and resume sampling for upstream of its discharge.
9. The Permiee shall perform three Effluent Pollutant Scans during the term of this permit. See Special Condition A. (4).
10. Chronic Toxicity (Ceriodaphnia) P/F A 67% February, May, August, and November. See Special Condition A. (3).
11. Optional Monitoring: Monitoring and reporting for conductivity will begin only if the 2021 industrial waste survey (IWS)
confirms industrial sources discharging pretreated wastewater into the Facility.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 6 of 12

Permit NCO031879
A. (3.) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) [ 15A NCAC 02B.0200 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 63% at 2.5 MGD or 67% at 3.0 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 February, May, August, and
November. Effluent sampling for this testing 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 H 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 TGP313 for
the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original) is to be sent
to the following address:
Attention: North 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, ATForms.ATB(i ,ncdenr.aov.
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
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 7 of 12

Permit NC0031879
A. (4.) EFFLUENT POLLUTANT SCAN [G.S. 143-215.1(B)]
a) The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One
scan must be performed in each of the following years: 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)
CO610
Trans-1,2-dichloroethylene
34546
Bis (2-chloroethyl) ether
34273
Chlorine (total residual, TRC)
50060
1, 1 -dichloroethylene
34501
Bis (2-chloroisopropyl) ether
34283
Dissolved oxygen
00300
1,2-dichloropropane
CO541
Bis (2-ethylhexyl) phthalate
CO100
Nitrate / Nitrite
00630
1,3-dichloropropylene
77163
4-bromophenyl phenyl ether
34636
Kjeldahl nitrogen
00625
Ethylbenzene
34371
Butyl benzyl phthalate
34292
Oil and grease
00556
Methyl bromide
34413
2-chloronaphthalene
34581
Phosphorus
CO665
Methyl chloride
34418
4-chlorophenyl phenyl ether
34641
Total dissolved solids
70295
Methylene chloride
34423
Chrysene
34320
Hardness
00900
1,1,2,2-tetrachloroethane
81549
Di-n-butyl phthalate
39110
Antimony
01097
Tetrachloroethylene
34475
Di-n-octyl phthalate
34596
Arsenic
01002
Toluene
34010
Dibenzo(a,h)anthracene
34556
Beryllium
01012
1, 1, 1 -trichloroethane
34506
1,2-dichlorobenzene
34536
Cadmium
01027
1,1,2-trichloroethane
34511
1,3-dichlorobenzene
34566
Chromium
CO034
Trichloroethylene
39180
1,4-dichlorobenzene
34571
Copper
01042
Vinyl chloride
39175
3,3-dichlorobenzidine
34631
Lead
01051
Acid -extractable compounds:
Diethyl phthalate
34336
Mercury (Method 1631E)
COMER
P-chloro-m-cresol
34452
Dimethyl phthalate
34341
Nickel
01067
2-chlorophenol
34586
2,4-dinitrotoluene
34611
Selenium
01147
2,4-dichlorophenol
34601
2,6-dinitrotoluene
CO626
Silver
01077
2,4-dimethylphenol
34606
1,2-diphenylhydrazine
34346
Thallium
01059
4,6-dinitro-o-cresol
34657
Fluoranthene
CO376
Zinc
01092
2,4-dinitrophenol
34616
Fluorene
34381
Cyanide
00720
2-nitrophenol
34591
Hexachlorobenzene
CO700
Total phenolic compounds
32730
4-nitrophenol
34646
Hexachlorobutadiene
CO702
Volatile organic compounds:
Pentachlorophenol
39032
Hexachlorocyclo-pentadiene
34386
Acrolein
34210
Phenol
34694
Hexachloroethane
34396
Acrylonitrile
34215
2,4,6-trichlorophenol
34621
Indeno(1,2,3-cd)pyrene
34403
Benzene
34030
Base -neutral compounds:
Isophorone
34408
Bromoform
32104
Acenaphthene
34205
Naphthalene
34696
Carbon tetrachloride
32102
Acenaphthylene
34200
Nitrobenzene
34447
Chlorobenzene
34301
Anthracene
CO220
N-nitrosodi-n-propylamine
34428
Chlorodibromomethane
34306
Benzidine
39120
N-nitrosodimethylamine
34438
Chloroethane
85811
Benzo(a)anthracene
CO526
N-nitrosodiphenylamine
34433
2-chloroethyl vinyl ether
34576
Benzo(a)pyrene
34247
Phenanthrene
34461
Chloroform
32106
3,4 benzofluoranthene
34230
Pyrene
34469
Dichlorobromomethane
32101
Benzo(ghi)perylene
34521
1,2,4-trichlorobenzene
CO551
1,1-dichloroethane
34496
Benzo(k)fluoranthene
34242
1,2-dichloroethane
32103
Bis (2-chloroethoxy) methane
34278
b) Reporting. Test results shall be reported electronically using the Division's eDMR system or on DWR
Form DMR-PPA-1(or on a form approved by the Director) by December 31" of each designated sampling
year.
c) The Permittee must at least report completion of the test in the eDMR system by entering "I" or "Y" for
parameter code NCO1 - Annual Pollutant Scan. If utilizing the DWR Form submit to the following
address:
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Permit NCO031879
NC DEQ / DWR / NPDES Files,1617 Mail Service Center, Raleigh, North Carolina 27699-1617.Or
the form may be uploaded at: https:Hedocs.deq.nc.gov/Forms/NPDES_WW-EDMR-Supplemental-Form
d) 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 122.210)(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:
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, ATForms.ATB&ncdenr.gov.
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. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S.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.)
• Section D. (2.)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
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:
Page 9 of 12

Permit NC0031879
NC DEQ / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 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 address above. See "How to Request a Waiver
from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following the issuance
of the permit or, in the case of a new facility, on the last day of the month following the commencement of
discharge.
NPDES Electronic Reporting Rule — Phase 2 Extension. EPA extended the Phase 2 deadline to December 21,
2025. The current compliance date, effective January 4, 2021, was extended as a final regulation change
published in the November 2, 2020 Federal Register.
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.federalre ig ster.gov/documents/2015/10/22/2015-24954/national-pollutant-discharge-climination-
system-npde s-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
Page 10 of 12

Permit NC0031879
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:
hiip:Hdeg.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.
(I I.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (I 1.)(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:
hl!p:Hdeg.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 122.221. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
V 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 qualifiedpersonnelproperly 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.)]
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].
Map will be added here once doc is in pdf.
Page 11 of 12

Permit No. NCO031879
Corpening Creek WWTP — NCO031879
City of Marion - McDowell County
Receiving Stream:
Youngs Fork
Stream Class:
Drainage Basin:
Catawba River Basin
Stream Segment:
Permitted Flow:
2.5/3.0 MGD
Sub -Basin:
Outfall 001 Location:
35°39'05" N, 81 °57'28" W
HUC:
State Grid/USGS Quad: Marion East/E11NW
N Facility Location (Not to scale)
C _�Mw
11-32-1-4a
03-08-30
03050101
Latitude 35° 39' 08" N Longitude 81° 57' 26" W
Page 12 of 12