NC0083119_Draft Permit_20190123

s� r ROY COOPCovER
;5 MICHAEL S. REGAN
•ra Sec,eta,y
` '�'" LINDA CULPEPPER
NORTH CAROLINA Duecla
Environmental Quality •
January 23, 2019
Christie Putnam
City of Concord
PO Box 308
Concord, NC 28026
Subject: Draft NPDES Permit NC0083119
Coddle Creek WTP
Grade I Physical Chemical WPCS
Cabarrus County
Dear Ms. Putnam:
The Division has reviewed your request to renew the subject permit. Please review this draft carefully to
ensure a thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
> Regulatory citations have been added.
> Outfall map has been updated.
> Iron has been removed from the Effluent table in Section A.(1) as there are no longer water quality
standards for Iron and the permit renewal application indicates that Iron sulfate or Ferrous sulfate
does not have the potential to be discharged.
> .Electronic DMR codes have been added for their respective parameters in the Effluent table in
Section A. (1).
> Former Footnote#4 in Section A. (1)has been removed as this is no longer required.
> Monitoring frequency for Turbidity has been updated to 2/Month in Section A. (1)per current water
treatment plant guidance. The Daily Max Limit has also been removed as the receiving stream is no
longer impaired for turbidity.
> Zinc has been removed from the Effluent table in Section A. (1) as the permit renewal application
indicates Zinc-orthophosphate or Sweetwater CP1236 does not have the potential to be discharged.
The corresponding footnote has been removed.
> Ammonia Nitrogen has been removed from the Effluent table in Section A. (1) as the permit renewal
application indicates that Ammonia Nitrogen/Chloramines does not have the potential to be
discharged. The corresponding footnote has been removed.
> Section A. (4) and Footnote#1 in Section A. (1)has been updated regarding electronic submission of
effluent data. Federal regulations require electronic submittal of all discharge monitoring reports
(DMRs).
> Whole Effluent Toxicity testing language has been updated in Footnote#4 in Section A. (1).
> The Supplement to Cover Sheet page has been updated to include the maximum, monthly average
flow, stream index and HUC code.
> The Permit Reopener—Whole Effluent Toxicity special condition (Section A. (3))has been removed
as the facility has passed the minimum requirement for toxicity testing over the past three years.
Please note that Coddle Creek is listed as an impaired waterbody on the North Carolina 303(d)Impaired
Waters List. Addressing impaired waters is a high priority with the Division, and instream data will
Q
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-3712

continue to be evaluated. If there is noncompliance with permitted effluent limits and stream impairment
can be attributed to your facility, then mitigative measures may be required.
rWith this notification, the Division will solicit public comment on this draft permit by publishing a notice in
newspapers having circulation in the general Cabarrus County area,per EPA requirements. Please
provide your comments,if any,to me no later than 30 days after receiving 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 the draft,please contact
me at the telephone number listed at the bottom of this page, or via e-mail [[e-mail]].
Sincerely,
C.A --
Sydney Carpenter
NPDES Program
cc: NPDES File
Mooresville Regional Office
Aquatic Toxicology Unit

Permit NC0083119
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
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 Concord
is hereby authorized to discharge wastewater from a facility located at the
Coddle Creek Water Treatment Plant (WTP)
6935 Davidson Highway
Concord
Cabarrus County
to receiving waters designated as an unnamed tributary to Coddle Creek in the Yadkin-Pee Dee River Basin,in
accordance with effluent limitations,monitoring requirements, and other conditions set forth in Parts I,II,III
and IV hereof.
This permit shall become effective .
This permit and authorization to discharge shall expire at midnight on November 30,2023.
Signed this day.
le
A:
Linda Culpepper, Director
Division of Water Resources By Authority of the Environmental Management Commission
Page 1 of 7

Permit NC0083119
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 Concord
is hereby authorized to:
1. Continue to operate a conventional water treatment plant with a discharge of wastewaters from
filter backwash and sedimentation basins to wastewater lagoons. This water treatment plant
currently has a design potable flowrate of 12.0 MGD and a maximum monthly average wastewater
discharge of approximately 0.929 MGD. This facility is located at 6935 Davidson Highway,
Concord in Cabarrus County. Wastewater treatment consist of:
• Two settling lagoons
• Dechlorination with calcium thiosulfate
2. Discharge of treated wastewater from said treatment works at the location specified on the attached
map into an unnamed tributary to Coddle Creek, currently classified C waters [Stream Index: 13-
1.7-6-(5.5)] in sub-basin 03-07-11 [HUC: 0304010501] of the Yadkin-Pee Dee River Basin.
Page 2 of 7

Permit NC0083 119
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge filter backwash from outfall 001. Such discharges shall be limited
and monitored' by the Permittee as specified below:
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
[Parameter Code] Average Maximum Frequency Type Location
Flow(MGD) [50050] , Continuous Continuous Effluent
TSS [C0530] , 30 mglL 45 mg/L Weekly Grab Effluent
pH [00400] 6.0 s.0-9.0 s.u. Weekly Grab Effluent
Total Residual Chlorine2 [50060] 17 pg/L Weekly Grab Effluent
Total Aluminum(pg/L) [01105] , Quarterly Grab Effluent
Total Manganese(pg/L) [01055] Quarterly Grab Effluent
Total Fluoride [00951] 1,800 pglL Monthly Grab Effluent
Total Phosphorus(mglL) [C0665] Quarterly Grab Effluent
Total Nitrogen(mg/L) [C0600] Quarterly Grab Effluent
Turbidity(NTU) [00070] 2/Month Grab Effluent
Whole Effluent Toxicity Monitoring3 [TGP3B] Monitor&Report Quarterly Grab Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's
eDMR system [see A. (3)].
2. Limit and monitor only if the facility adds chlorine or chlorine derivatives to water that is
eventually discharged. The Division shall consider all effluent TRC values reported below 50
µg/l to be in compliance with the permit. However, the Permittee shall continue to record and
submit all values reported by a North Carolina certified laboratory(including field certified),
even if these values fall below 50 µg/1.
3. Whole Effluent Toxicity testing: Ceriodaphnia dubia 7 day pass/fail test @ 90% concentration.
See Section A. (2.) for toxicity testing requirements. Toxicity testing should be performed during
the months of January,April,July and October.
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 3 of 7

Permit NC0083119
A. (2.) CHRONIC TOXICITY MONITORING(QUARTERLY)
[15A NCAC 02B .0500 et seq.]
The permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the"North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure,"Revised December 2010, or subsequent
versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The testing
shall be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be performed during
the months of January,April,July and October. These months signify the first month of each
three month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted final ,
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form(MR-1) for the month in which it was performed,using the parameter
code TGP3B. Additionally, DWR Form AT-1 (original)is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Environmental Sciences Section
1621 Mail Service Center
Raleigh,N.C. 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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 and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. 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 Environmental Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test,this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina
Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re-
opened and modified to include alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently than required by this permit,the results of such
monitoring shall be included in the calculation &reporting of the data submitted on the DMR&all AT L
Forms submitted.
Page 4 of 7

Permit NC0083119
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival,minimum control organism reproduction, and appropriate environmental controls,
shall constitute an invalid test and will require immediate follow-up testing to be completed no later
than the last day of the month following the month of the initial monitoring.
A. (3.) ELECTRONIC REPORTING OF 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 [Supersedes Section D.(2.) and Section E. (5.)(a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the state's
eDMR application is compliant with EPA's Cross-Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,
signing, and submitting one signed original and a copy of the computer printed eDMR to the following
address:
NC 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.
Page 5 of 7

Permit NC0083119
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: http://www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-
system-npdes-electronic-reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty(60) days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports. The duration of a temporary waiver
shall not exceed 5 years and shall thereupon expire. At such time,monitoring data and reports shall be
submitted electronically to the Division unless the permittee re-applies for and is granted a new
temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit monitoring data
and reports on paper to the Division for the period that the approved reporting waiver request is
effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
https://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.(11.) (d)1
Page 6 of 7

Permit NC0083 119
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].
Page 7 of 7

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City of Concord Facility
lift-X
Coddle Creek WTP Location
Latitude&Longitude:35°25'57"N,80°41'40"W Stream Segment:13-17-6-(5.5) not to scale
USGS Grid: Concord HUC: 0304010501
Receiving Stream: UT to Coddle Creek Stream Class: C NPDES Permit No. NC0083119
Drainage Basin: Yadkin-Pee Dee River Basin Sub-Basin: 03 07-11 ;worth Cabarrus County