NC0046302_Draft Permit_20171018

Water Resources
ENVIRONMENTAL QUALITY
Mr. Michael Brandt,
Town of Mayodan
210 W. Main Street
Mayodan, NC 27027
Dear Mr. Brandt:
Town Manager
ROY COOPER
Govei noy
MICHAEL S. REGAN
Seci etay
S JAY ZIMMERMAN
Drt ectoi
October 18, 2017
Subject: Draft NPDES Permit NCO046302
Mayodan WTP
Class PC -1
Rockingham County
The Division has reviewed your request to renew the subject permit. Please review this draft carefully
to ensure your thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
➢ Language has been added to Section A. (1) and Section A. (3) has been added to require
electronic submission of effluent data. Federal regulations require electronic submittal of all
discharge monitoring reports (DMRs).
➢ Regulatory citations have been added to the permit.
➢ Outfall map has been updated.
➢ The expiration month has been changed to November to allow for a full 5 -year permit cycle.
➢ Language has been updated on the Supplement to Permit Cover Sheet per the current water
treatment plant strategy.
➢ The measurement frequency for flow has been changed to 2/month per the current water
treatment plant strategy in Section A. (1).
➢ The total residual chlorine limit has been changed to both daily maximum and monthly average
per the current water treatment plant strategy in Section A. (1).
➢ Monitoring for Total Iron has been removed as there are no longer water quality standards for
iron and the permit renewal application indicates that iron sulfate/ferrous sulfate do not have the
potential to be discharged.
➢ Limits have been added for Total Copper, and monitoring has been changed to monthly based on
a reasonable potential to exceed water quality standards.
➢ The Total Residual Chlorine footnote has been updated.
➢ Quarterly Total Hardness monitoring has been added per the current water treatment plant
strategy.
➢ A flow footnote has been added in Section A. (1) per the current water treatment plant strategy.
➢ The footnote stating monitoring should be performed in conjunction with toxicity testing was
removed as this is no longer required.
➢ Language in Section A. (2) has been updated.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, NC 27699-1617
919 807 6300 919-807-6389 FAX
https•//deq.nc gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits

With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Rockingham 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 919-807-6333, or via e-mail [[e-mail]].
Sincerely,
Bri a Young
Compliance and Expedit Permitting Unit
cc: NPDES Files
ec: Winston-Salem Regional Office
WSS/Aquatic Toxicology Branch
DWR/Public Water Supply Regional Engineer
NC Wildlife Resources Commission

Permit NCO046302
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
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
Town of Mayodan
is hereby authorized to discharge wastewater from a facility located at the
Mayodan WTP
500 East Roach Street
Mayodan
Rockingham County
to receiving waters designated as an unnamed tributary to the Mayo River in the Roanoke 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, 2022.
Signed this day.
S. Jay Zimmerman, P.G.
Director, Division of Water Resources
By Authority of the Environmental Management Commission
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Permit NC0046302
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 Town of Mayodan
is hereby authorized to:
Continue to operate a Conventional water treatment plant with a discharge of wastewaters from
decanted filter backwash and filter wastewater. This water treatment plant currently has a design
potable flowrate of 3.0 MGD and a maximum, monthly average wastewater discharge of 0.025
MGD. This facility is located at Mayodan Water Treatment Facility, at 500 East Roach Street, in
Mayodan in Rockingham County. Wastewater treatment consists of:
Two alternately utilized settling lagoons
Dechlorination (tablets) prior to discharge
2. Discharge from said treatment works at the location specified on the attached map into an Unnamed
Tributary to the Mayo River [Stream Segment: 22-30-(9.5)], a waterbody currently classified WS -IV
CA waters in subbasin 03-02-02 [HUC: 0301010304] in the Roanoke River Basin.
Page 2 of 7

Permit NCO046302
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored'
by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
Parameter Code
LIMITS
MONITORING REQUIREMENTS
Monthly Daily
Average Maximum
Measurement
Frequency
Sample Type
Sample
Location
Flow 2 50050
2/Month
Instantaneous
Effluent
Total Suspended Solids C0530
30 0 mg/L 45.0 mg/L
2/month
Grab
Effluent
pH 00400
z 6.0 s u and <— 9.0 s.0
2/month
Grab
Effluent
Total Residual Chlorine 3 50060
17 pg/L
2/month
Grab
Effluent
Turbidity 00070
2/month
Grab
Effluent
Aluminum 01105
Quarterly
Grab
Effluent
Total Copper 01042
7 88 pg/L
10 47 pg/L
Monthly
Grab
Effluent
Total Manganese 01055
Quarterly
Grab
Effluent
Hardness — Total as
[CaCO3 or (Ca + Mg)] 4,5 00900
Quarterly
Grab
Effluent
Hardness — Total as
45
[CaCO3 or (Ca + Mg)] 0 00900
Quarterly
Grab
Upstream
Whole Effluent Toxicity
Monitoring TGA3B
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 Duration of discharge should be noted in log books and a Total daily discharge reported in the DMR.
3 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/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 µg/l
4. Effluent Hardness sampling should be performed in conjunction with testing for hardness dependent
metals (cadmium, copper, lead, nickel, silver, and zinc)
5 The Permittee shall sample mstream 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 mstream 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 mstream hardness test results with its permit renewal application package. If
Coalition membership is cancelled or the Coalition terminates mstream hardness sampling at the
Page 3 of 7

Permit NC0046302
approved station, the Permittee will immediately notify the Division and resume sampling for instream
hardness, upstream of its discharge.
6. Ceriodaphnia dubia 48 hour acute pass/fail test @ 90% concentration. See Condition A. (2.) for toxicity
testing requirements. Toxicity testing should be performed during the months of March, June, September
and December.
All samples collected should be of a representative discharge.
There shall be no floating solids or foam in other than trace amounts.
A. (2.) ACUTE TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[15A NCAC 02B.0500 et seq.]
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A
Single Effluent Concentration" (Revised December` 20,10 or subsequent versions). The monitoring shall
be performed as a Ceriodaphnia dubia 48 hour static test. The effluent concentration at which there
may be at no time significant acute mortality is 90% (defined as treatment two in the procedure
document). Effluent samples for self-monitoring purposes musf be obtained during representative
effluent discharge below all waste treatment. 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.
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
TGA3B. Additionally, DWR Form AT -2 (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 27699-1623
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.
3
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
Water Sciences Section at the address cited above.
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Permit NCO046302
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 either these monitoring requirements 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.
Should it be determined by the North Carolina Division of Water Resources that the facility's discharge
frequency and duration enable chronic sampling according to either the North Carolina Ceriodaphnia
Chronic Whole Effluent Toxicity Procedure or to Section 8.3, in Methods EPA -821-R-02-013, the
permit may be re -opened and modified to include chronic toxicity tests.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival 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.)
• 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:
NC DEQ / Division of Water Resources / Water Quality Permitting Section
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Permit NC0046302
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: https://www.federalregister.gov/documents/2015/10/22/2015-24954/national-
pollutant-discharge-elimination-"s, std em-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
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Permit NC0046302
temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit monitoring data
and reports on paper to the Division for the period that the approved reporting waiver request is
effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section
B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting
purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account
and login credentials to access the eDMR system. For more information on North Carolina's eDMR
system, registering for eDMR and obtaining an eDMR user account, please visit the following web
page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
7 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.)]
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

Town of Mayodan
Mayodan WTP
NPDES Permit NCO046302
Receiving Stream: UT to Mayo River Stream Class: WS -IV; CA
Stream Segment: 22-30-(9.5) Sub -Basin #: 03-02-02
River Basin: Roanoke HUC: 0301010304
County: Rockingham
SCALE
1:24,000
Facility Location
scale not shown
USGS Quad: Mayodan
36.4216670, -79.967777780