NC0024333_Draft Permit_20200323

ROY COOPER ' �", k
Governor i'\ I � '
' ?
MICHAEL S.REGAN *
Secretary
S.S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
March 23, 2020
Mr. Russell Colbath, P.E.
Director of Water Resources
City of Monroe
PO Box 69
Monroe,North Carolina 28111-0069
Subject: Draft NPDES Permit Renewal
Permit NC0024333
Monroe WWTP
Union County
Grade IV Biological WPCS
SIC Code 4952
Dear Mr. Colbath:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it
contains. There are several changes from the existing permit, including the following:
• Per the results of instream waste concentration(IWC)-based calculations for total
residual chlorine(TRC), TRC limits have been revised [See A. (1.) and A. (2.)].
• Based on the reasonable potential analysis (RPA) showing no reasonable potential to
violate state water quality standards, the monitoring requirements for copper, silver and zinc
have been removed from the permit [See A. (1) and A. (2.)].
• Based on the reasonable potential analysis(RPA)predicting a maximum effluent chloride
concentration that is greater than half of the allowable discharge concentration based on state
water quality standards, quarterly monitoring for chloride has been added to the permit [See
A. (1.) and A. (2.)].
• Based on Mercury TMDL evaluation showing mercury values reported at levels > 1 ng/L
and since the permitted flow is greater than 2 MGD, Special Condition A. (5.) Mercury
Minimization Plan has been added to the permit.
• 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
North Carolina Department of Environmental Quality I Division of Water Resources
D
,,to 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
NORTH CARPI
o.,.,mrm of emnom,wmi WO e' 919.707.9000

sampling,upstream of the discharge,have been added to the permit at a monitoring
frequency of quarterly[See A. (1.) and A. (2.)].
• Language has been added to Footnote 2 to account for influent and effluent abbreviations
[See A. (1.) and A. (2.)].
• Some of the wording has changed in Special Condition A. (3.), Chronic Toxicity Permit
Limit,please review each paragraph carefully.
• Special Condition A. (4.) has been modified to include the specific three years in which
the Effluent Pollutant Scan shall be performed(2022, 2023, and 2024). In addition, at the end
of the Special Condition, 2nd species Toxicity Testing Requirements for municipal permit
renewals per Federal Regulations [40 CFR 122.21(j)(5)] have been added.
• Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs)and program reports.The requirement to continue reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report(eDMR)internet
application has been added to your NPDES permit [See Special Condition A. (6.)].
• Parameter codes have been added to the Effluent Limitations and Monitoring Requirements
[ See A. (1.) and A. (2.)].
• Regulatory citations have been added to the permit.
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 Union County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following: NCDEQ/DWR,NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh,NC 27699-1617 no later than 30 days
after receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit,please call me at(919) 707-3609 or by email at [e-mail].
Sincerely,
V
Nick Coco, Engineer
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/Hannah Headrick
Page2of2

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,
City of Monroe
is hereby authorized to discharge wastewater from a facility located at the
Monroe Wastewater Treatment Plant (WWTP)
775 Treeway Drive
Monroe
Union County
to receiving waters designated as Richardson Creek 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.
This permit shall become effective Month xx, 2020.
This permit and authorization to discharge shall expire at midnight on January 31, 2025.
Signed this day Month xx, 2020.
_DRAFT
S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0024333
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge, are
hereby revoked. [The exclusive authority to operate this facility arises under this permit.
The authority to operate the facility under previously issued permits bearing this number is
no longer effective.] The conditions, requirements, terms and provisions of this permit
authorizing discharge under the NPDES govern discharges from this facility.
The City of Monroe is hereby authorized to:
1. Continue to operate a 10.4 MGD wastewater treatment facility consisting of:
• Two influent pump stations with a total of six pumps
• Two mechanical rotary screens
• Flow equalization basin
• Five activated sludge fine-bubble diffused air aeration basins
• Four secondary clarifiers
• Six activated charcoal tertiary filters
• Chlorine gas disinfection
• Sulfur dioxide gas dechlorination
• Five aerobic sludge digesters
• Five sand drying beds (inactive)
• Filter press and bio-solids cake storage bed with drainage system
connected to facility headworks
The facility is located at the Monroe WWTP, 775 Treeway Drive, Monroe,
Union County, and
2. After receiving an Authorization to Construct (ATC) from the Division,
completing construction, and submitting an Engineer's Certification for
completion of expansion to 12.5 MGD, operate a 12.5 MGD wastewater
treatment facility.
3. Discharge from said treatment works at the location specified on the attached
map into Richardson Creek, which is classified C waters in the Yadkin-Pee
Dee River Basin.
Page 2 of 10

Permit NC0024333
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (10.4 MGD)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.] Grade IV Biological Water
Pollution Control System [15A NCAC 08G .0302]
During the period beginning on the effective day of this permit and lasting until expansion to 12.5 MGD or
expiration, the Permittee is authorized to discharge municipal wastewater from outfall 001. Such discharges
shall be limited and monitored'by the Permittee as specified below:
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location2
Flow 50050 10.4 MGD Continuous Recording I or E
—BOD5(20°C)3
(April 1 October 31) C0310 7.3 mg/L 11.0 mg/L 2/Week4 Composite I and E
(20°C)3 C0310 14.5 mg/L 22.0 mg/L 2/Week4 Composite I and E
(November 1 -March 31)
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/Week4 Composite I and E
Ammonia (NH3 as N)
(April 1 October 31) C0610 1.0 mg/L 3.0 mg/L 2/Week4 Composite E
Ammonia(NH3 as N)
(November 1 March 31) C0610 2.0 mg/L 6.0 mg/L 2/Week4 Composite E
Dissolved Oxygen 00300 Daily Average >_ 5.0 mg/L Daily Grab E
Fecal Coliform 31616 200/100 mL 400/100 mL 2/Week4 Grab E
(geometric mean)
Total Residual Chlorines 50060 17 µg/L Daily Grab E
Temperature,°C 00010 Monitor and Report Daily Grab E
pH 00400 Between 6.0 and 9.0 standard units Daily Grab E
Conductivity, umhos/cm 00094 Monitor and Report Daily Grab E
Oil&Grease, mg/L 00556 Monitor and Report Monthly Grab E
TN,mg/L C0600 Monitor and Report Monthly Composite E
Total Phosphorus, mg/L C0665 Monitor and Report Monthly Composite E
Cyanide6 00720 5.1 µg/L 22.5 µg/L Monthly Grab E
Fluoride, µg/L 00951 Monitor and Report Quarterly Composite E
Chloride,µg/L 00940 Monitor and Report Quarterly Composite E
Total Hardness[as 00900 Monitor and Report Quarterly Composite E
CaCO3], mg/L
Chronic Toxicity8 TGP3B See Note 7 Quarterly Composite E
Effluent Pollutant Scan NC01 Monitor and Report Footnote 9 E
Dissolved Oxygen, mg/L 00300 Monitor and Report Footnote 2 Grab U, D
Temperature,°C 00010 Monitor and Report Footnote 2 Grab U, D
Fecal Coliform, #/100 mL 31616 Monitor and Report Footnote 2 Grab U, D
Conductivity, umhos/cm 00094 Monitor and Report Footnote 2 Grab U, D
Total Hardness[as 00900 Monitor and Report Quarterly Grab U
CaCO3], mg/Lo
Notes:
1. The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application
system. See Special Condition A. (6.).
2. Sample Locations: I—Influent, E—Effluent, U: upstream at Walkup Avenue. D: downstream—(1) below
discharge at NCSR 1006 and (2) below Stewarts Creek at NCSR 1630. Instream samples shall be collected
3/week from June 1-September 30 and weekly throughout the rest of the year. As a participant in the
Yadkin-Pee Dee River Basin Association, the subject facility is not responsible for conducting the
instream monitoring requirements above. Should your membership in the Association be terminated,
you shall notify the Division immediately and the instream monitoring requirements will be
reinstated.
Notes continued on next page.
Page 3 of 10

Permit NC0024333
Notes (continued):
3. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15%of the respective
influent value (85%removal).
4. 2/Week sampling must occur on any two non-consecutive days during the calendar week.
5. Limit and monitor only applicable if the facility adds chlorine to water that is eventually discharged. The
Division shall consider all effluent TRC values reported below 50 pg/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 pg/l.
6. The quantitation level for cyanide shall be 10 µg/L. Values reported less than 10 µg/L shall be considered
zero for compliance purposes.
7. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium, copper, lead, nickel, silver, and zinc).
8. Chronic Toxicity (Ceriodaphnia) P/F at 90%; tests shall be conducted in March, June, September and
December [see Part A. (3.) for further details]. Chronic toxicity sampling shall coincide with metals sampling.
9. The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A.(4.)].
10. The Permittee shall sample instream hardness, upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream. If the Permittee is a member of 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.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) 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]
During the period beginning upon receipt of the Engineer's Certification for completion of the expansion to 12.5
MGD and permit expiration, the Permittee is authorized to discharge municipal wastewater from outfall 001.
Such discharges shall be limited and monitored8 by the Permittee as specified below:
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code
Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location2
Flow 50050 12.5 MGD Continuous Recording I or E
BOD5(20°C)3
(April 1 October 31) C0310 5.0 mg/L 7.5 mg/L 2/Weeke Composite I and E
BOD5(20°C)3
(November 1 March 31) C0310 10.0 mg/L 15.0 mg/L 2/Week4 Composite I and E
Total Suspended Solids3 C0530 30.0 mg/L 45.0 mg/L 2/Week4 Composite I and E
Ammonia(NH3 as N) C0610 1.0 mg/L 3.0 mg/L 2/Week4 Composite E
(April 1 -October 31)
Ammonia(NH3 as N)
(November 1 March 31) C0610 2.0 mg/L 6.0 mg/L 2/Week4 Composite E
Dissolved Oxygen 00300 Daily Average >_ 5.0 mg/L Daily Grab E
Fecal Coliform 31616 200/100 mL 400/100 mL 2/Week4 Grab E
(geometric mean)
Total Residual Chlorines 50060 17 µg/L Daily Grab E
Temperature, °C 00010 Monitor and Report Daily Grab E
pH 00400 Between 6.0 and 9.0 standard units Daily Grab E
Conductivity, umhos/cm 00094 Monitor and Report Daily Grab E
Oil&Grease, mg/L 00556 Monitor and Report Monthly Grab E
Table continued on next page.
Page 4 of 10

Permit NC0024333
PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
Parameter Code
Monthly Weekly Daily Measurement Sample Sample
Average Average Maximum Frequency Type Location2
Total Nitrogen, mg/L C0600 Monitor and Report Monthly Composite E
Total Phosphorus,mg/L C0665 Monitor and Report Monthly Composite E
Cyanide6 00720 5.1 µg/L 22.5 µg/L Monthly Grab E
Fluoride, µg/L 00951 Monitor and Report Quarterly Composite E
Chlorides, µg/L 00940 Monitor and Report Quarterly Composite E
Total Hardness[as 00900 Monitor and Report Quarterly Composite
CaCO3], mg/L' E
Chronic Toxicity8 TGP3B See Note 7 Quarterly Composite E
Effluent Pollutant Scan NC01 Monitor and Report Footnote 9 E
Dissolved Oxygen 00300 Monitor and Report Footnote 2 Grab U, D
Temperature 00010 Monitor and Report Footnote 2 Grab U, D
Fecal Coliform 31616 Monitor and Report Footnote 2 Grab U, D
Conductivity 00094 Monitor and Report Footnote 2 Grab U, D
Total Hardness[as 00900 Monitor and Report QuarterlyGrab U
CaCO3], mg/L" Po
Notes:
1.The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application
system. See Special Condition A. (6.).
2. Sample Locations: I—Influent, E—Effluent, U: upstream at Walkup Avenue. D: downstream—(1) below
discharge at NCSR 1006 and (2) below Stewarts Creek at NCSR 1630. Instream samples shall be collected
3/week from June 1-September 30 and weekly throughout the rest of the year. As a participant in the
Yadkin-Pee Dee River Basin Association, the subject facility is not responsible for conducting the
instream monitoring requirements above. Should your membership in the Association be terminated,
you shall notify the Division immediately and the instream monitoring requirements will be
reinstated.
3.The monthly average BODs and Total Suspended Solids concentrations shall not exceed 15% of the respective
influent value (85% removal).
4. 2/Week sampling must occur on any two non-consecutive days during the calendar week.
5. Limit and monitor only applicable if the facility adds chlorine to water that is eventually discharged. The
Division shall consider all effluent TRC values reported below 50 pg/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 pg/l.
6.The quantitation level for cyanide shall be 10 µg/L. Values reported less than 10 µg/L shall be considered
zero for compliance purposes.
7. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium, copper, lead, nickel, silver, and zinc).
8. Chronic Toxicity(Ceriodaphnia) P/F at 90%; tests shall be conducted in March, June, September and
December [see Part A. (3.) for further details]. Chronic toxicity sampling shall coincide with metals sampling.
9.The Permittee shall perform three Effluent Pollutant Scans during the term of this permit [see A.(4.)].
10.The Permittee shall sample instream hardness, upstream of the facility's discharge. The sample shall be
representative of the hardness in the receiving stream. If the Permittee is a member of 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.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 5 of 10

Permit NC0024333
A. (3.) 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 90 %.
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, ATForms.ATB(Zincdenr.gov.
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 6of10

Permit NC0024333
A. (4.) EFFLUENT POLLUTANT SCAN
[G.S. 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: 2022, 2023, and 2024.
Analytical methods shall be in accordance with 40 CFR Part 136 and shall be sufficiently sensitive to
determine whether parameters are present in concentrations greater than applicable standards and
criteria. Samples should be collected with one quarterly toxicity test each year, and must represent
seasonal variation [i.e., do not sample in the same quarter every year]. Unless otherwise indicated,
metals shall be analyzed as"total recoverable."
Ammonia(as N) C0610 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 C0541 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 C0665 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 C0034 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 C0626
Silver 01077 2,4-dimethylphenol 34606 1,2-diphenylhydrazine 34346
Thallium 01059 4,6-dinitro-o-cresol 34657 Fluoranthene C0376
Zinc 01092 2,4-dinitrophenol 34616 Fluorene 34381
Cyanide 00720 2-nitrophenol 34591 Hexachlorobenzene C0700
Total phenolic compounds 32730 4-nitrophenol 34646 Hexachlorobutadiene C0702
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 C0526 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 C0551
1,1-dichloroethane 34496 Benzo(k)fluoranthene 34242
1,2-dichloroethane 32103 Bis(2-chloroethoxy)methane 34278
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"
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
Page 7 of 10

Permit NC0024333
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that
Municipal facilities that are subject to the Effluent Pollutant Scan requirements listed above are also
subject to additional toxicity testing requirements specified in Federal Regulation 40 CFR
122.21(j)(5). The US EPA requires four (4) toxicity tests for a test organism other than the test
species currently required in this permit. The multiple species tests should be conducted either
quarterly for a 12-month period prior to submittal of the permit renewal application, or four tests
performed at least annually in the four and one half year period prior to the application. These tests
shall be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple
species toxicity test results shall be filed with the Aquatic Toxicology Branch at the following address:
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 Z 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.) MERCURY MINIMIZATION PLAN (MMP)
[G.S. 143-215.1(b)]
The Permittee shall develop and implement a mercury minimization plan during this permit term.
The MMP should place emphasis on identification of mercury contributors and goals for reduction.
Results shall be summarized and submitted with the next permit renewal. Performance of the
Mercury Minimization Plan will meet the requirements of the TMDL (Total Maximum Daily Load) for
mercury approved by USEPA on October 12, 2012, unless and until a Waste Load Allocation specific
to this facility is developed and this NPDES permit is amended to require further actions to address
the Waste Load Allocation.
A. (6.) 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.) 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 electronically using eDMR. The eDMR system allows permitted facilities to enter
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Permit NC0024333
monitoring data and submit DMRs electronically using the internet. Until such time that the state's
eDMR application is compliant with EPA's Cross-Media Electronic Reporting Regulation (CROMERR),
permittees will be required to submit all discharge monitoring data to the state electronically using
eDMR and will be required to complete the eDMR submission by printing, signing, and submitting
one signed original and a copy of the computer printed eDMR to the following address:
NC 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 above. See "How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• 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:
httpps://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
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Permit NC0024333
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.
111.1 (d)l
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following
web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or persons
who manage the system, or those persons directly responsible for gathering the information, the
information submitted is, to the best of my knowledge and belief true, accurate, and complete. I am
aware that there are significant penalties for submitting false information, including the possibility of
fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.11
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 10 of 10

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Outfall & Stream Information 4 Facility
Latitude: 34°59'48" Sub-Basin: 03-07-14 Location ' 4'-
Longitude: 80°29'28"
USGS Quad: H17NW
Stream Class: C
City of Monroe
Receiving Stream: Richardson Creek
No
Permitted Flow: 10.4 and 12.5 MGD rt h NC0024333
Wastewater Treatment Plant
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