NC0086291_Draft Permit_20180502

ROY COOPER
y.a
Governor
MICHAEL S. REGAN
Secretary
Water Resources LINDA CULPEPPER
EnNironmental Quality Interim Director
May 2,2018
Ms. Anne-Marie Knighton,Town Manager
Town of Edenton
P.O.Box 300
Edenton,NC 27932
Subject: Draft NPDES Permit NC0086291
Beaver Hill WTP(PCNC)
Chowan County
Dear Ms.Knighton:
In response to your request to renew the subject NPDES permit,the Division of Water Resources(DWR or
the Division)hereby transmits this draft for your review and comment.Please review this document to assure
your understanding of the permit limits and monitoring conditions, and to correct errors,if any.
The Division understands that you have made no significant changes to your facility since the last permit
renewal.We have made the following updates to your previous permit:
1. The facility map has been updated.
2. Regulatory citations have been added.
3. Concurrent sampling with quarterly WET testing is no longer required for toxicants.
4. Total Manganese monitoring has been removed because the EPA approved removal of these NC
aquatic life standards as part of 2007-2016 Triennial review.Therefore,there are no limits to compare
monitoring data for these parameters.
5. Total Copper and Total Zinc have been removed because data,including Total Hardness,did not
show reasonable potential to exceed the water quality standard.
6. Due to toxicity failure, a re-opener condition for whole effluent toxicity has been added as descnbed
in Section A. (3.).
7. Toxicity monitoring has been changed to Acute WET Testing which includes: Fathead Minnow
(Pimephales promelas), 24-hour static test,pass/fail,monitonng only,test at 90%.Acute WET
testing is now required because the UT"Filbert Creek"to Edenton Bay is tidal(IWC is incalculable)
and is currently classified as freshwater C;NSW.
8. The following Total Chlonde limits have been applied for this permit renewal with monthly
monitoring:
Parameter Outfall Monthly Average Limit Daily Maximum Limit
Chlonde 001 230 mg/L 230 mg/L
9. A compliance schedule has been added for Total Chloride limits in Section A. (2.).The Total
Chlonde limits will become effective 48 months from the effective date of the permit.
10. The following updates have been added to the Supplement to Permit Cover Sheet facility description:
After construction of upgrades for the removal of total organic carbon(TTHM precursor),to
operate an ion exchange water treatment plant with discharge of wastewaters from media
filter backwash and regeneration with a design potable flowrate of 0.542 MGD and a design
backwash and regeneration flow rate of 0.034 MGD,with water and wastewater treatment
consisting of:
State of North Carolina Environmental Quality
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-9000

Mr.Knighton
May 2, 2018
Page 2 of 2
• well water supply system
• aerator
• retention basin
• two (2)pressure vessels (300 GPM,7-ft diameter),with anion exchange media
(PurolitePlus/9218),includmg a backwash and brine(sodium chloride)regeneration
system
• two(2)vertical turbine variable frequency drive pumps (300 GPM)
• two(2) cation exchange softeners with a high capacity polystyrene cation exchange
resin with 30%bypass capacity around the cation exchange system, including a
backwash and brine(sodium chloride)regeneration system.
Concurrent with this notification,the Division will solicit public comment on this draft by publishing a notice
in newspapers having circulation in the general Chowan County area, as required by the NPDES Program.
Please provide your comments,if any,to me via email [[e-mail]] or write to my attention
care of DEQ/DWR/NPDES Program no later than June 1,2018. Your written comments are welcome but
not mandatory.
Following the mandatory 30-day public comment period,the Division will review all pertinent comments on
your permit draft, and take appropriate action pnor to issuing your NPDES permit final. If you have questions
concernmg this draft,please e-mail me or call my direct line(919) 807-6307.
Sincerely,
tcAtiaCori-ot-tot.a(-------
Derek Denard,Environmental Specialist
Compliance&Expedited Permitting Unit
Division of Water Resources,NCDEQ
Enclosure:NPDES Permit NC0086291 (renewal DRAFT)
he NPDES Program Files
ec DWR/WaRO,Robert Tankard[robert tankdard@ncdenr gov],Robert Bullock[robert bullock@ncdenr gov]
Scott Vinson[scott vinson@ncdenr gov]
DWR/PWS,Turner Momson[turner momson@ncdenr gov]
Town of Edenton,Anne-Marie Knighton,Town Manager[anne-mane kmghton@edenton nc gov]
Corey Gooden,Public Works Director[corey gooden@edenton nc gov
Wastewater Operator Certification Group/Maureen Kinney[Maureen Kinney@ncdenr gov]
Aquatic Toxicology Branch/Susan Meadows[susan meadows@ncdenr gov],Cindy Moore[cindy moore@ncdenr gov]
David E Tuten,Stroud Engineering,P A [Dtuten@StroudEngineer com]

NPDES Permit NC0086291
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 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 Edenton
is hereby authorized to discharge treated wastewater from a facility known as
Beaver Hill Water Treatment Plant (WTP)
Dr. Martin Luther King, Jr. Avenue, Edenton 27932
Chowan County
to receiving waters designated as an unnamed tributary"Filbert Creek"to Edenton Bay, within the
River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set
forth in Parts I, II, III and IV hereof.
The permit shall become effective , 2018.
This permit and the authorization to discharge shall expire at midnight on , 2023.
Signed this day , 2018.
Linda Culpepper, Intenm Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

NPDES Permit NC0086291
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this 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 described herein.
Town of Edenton
is hereby authorized to:
1. continue to operate an ion exchange water treatment plant with discharge of wastewaters from media
filter backwash and regeneration with a design potable flowrate of 0.725 MGD and a design
backwash and regeneration flow of 0 010 MGD, with water and wastewater treatment consisting of;
• well water supply system
• aerator
• retention basin
• two (2)high service pumps (420 GPM)
• two (2) cation-exchange water-softeners, including a backwash and brine (sodium chloride)
regeneration system
located at the Beaver Hill Water Treatment Plant(WTP), Dr. Martin Luther King, Jr. Avenue,
Edenton, Chowan County;
2. after construction of upgrades for the removal of total organic carbon (TTHM precursor), to operate
an ion exchange water treatment plant with discharge of wastewaters from media filter backwash
and regeneration with a design potable flowrate of 0 542 MGD and a design backwash and
regeneration flow rate of 0.034, with water and wastewater treatment consisting of,
• well water supply system
• aerator
• retention basin
• two (2) pressure vessels (300 GPM, 6-ft diameter), with anion exchange media
(PurolitePlus/9218), including a backwash and brine (sodium chloride)regeneration system
• two (2) vertical turbine variable frequency drive pumps (300 GPM)
• two (2) cation exchange softeners with a high capacity polystyrene cation exchange resin
with 30%bypass capacity around the cation exchange system, including a backwash and
brine (sodium chloride) regeneration system; and
3. discharge from said treatment works via Outfall 001 at a location specified on the attached map,
into an unnamed tributary"Filbert Creek"to Edenton Bay [Stream Segment 26-1], currently a
Class C; NSW waterbody within Subbasin 03-01-04 [HUC 030102050101] of the Chowan River
Basin.
Page 2 of 8

NPDES Permit NC0086291
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 filter backwash from outfall 001. Such discharges shall be limited,
monitored and reported' by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS1
CHARACTERISTIC Monthly Daily Measurement Sample Sample
[PARAMETER CODES] Average Maximum Frequency Type Location 2
Flow(MGD)3 50050 Monitor&Report 2/Month Instantaneous 3 E
Total Residual Chlorine(µg/L)4 50060
17 µg/L 4 2/Month Grab E
pH(su) 00400 Not<6 0 or>9 0 2/Month Grab E
standard units
Total Suspended Solids(TSS)(mg/L) C0530 30 0 mg/L 45.0 mg/L 2/Month Grab E
Total Dissolved Solids(TDS) (mg/L) 70295 Monitor&Report Monthly Grab E
Turbidity(NTU) 00070 Monitor&Report Monthly Grab E
Temperature(°C) 00010 Monitor&Report Monthly Grab E
Dissolved Oxygen(DO) (mg/L) 00300 Momtor&Report Monthly Grab E
Salinity(ppth) 00480 Monitor&Report Monthly Grab E
Conductivity(umhos/cm) 00094 Monitor&Report Monthly Grab E
Total Chlonde(mg/L)5 00940 230 mg/L5 230 mg/L5 Monthly Grab E
Total Fluonde(mg/L) 00951 Monitor&Report Monthly Grab E
Ammonia Nitrogen(NH3) (mg/L) C0610 Monitor&Report Monthly Grab E
Total Nitrogen(mg/L)6 C0600 Monitor&Report Quarterly Grab E
Total Phosphorus(mg/L) C0665 Monitor&Report Quarterly Grab E
Acute WET Testing 7 TGE6C Monitor&Report Quarterly Grab E
pH(su) 00400 Monitor&Report Monthly Grab U&D
Temperature(°C) 00010 Monitor&Report Monthly Grab U&D
Dissolved Oxygen(DO)(mg/L) 00300 Monitor&Report Monthly Grab U&D
Salinity(ppth) 00480 Monitor&Report Monthly Grab U&D
Conductivity(umhos/cm) 00094 Monitor&Report Monthly Grab U&D
Footnotes
1 The Permittee shall begin submitting Discharge Monitonng Reports electronically using NC DWR's
eDMR application system See Condition A (5 )
2. E=Effluent; I=Influent, U=upstream at least 50 feet from the outfall, D=downstream at least 100
feet from the outfall.
3 For instantaneous flow monitoring, the duration of the discharge must be reported in addition to the total
flow
4 The Division shall consider TRC effluent values reported below 50 µg/L to be compliant with the permit
However,the Permittee shall continue to record and submit all values reported by a North Carolina-
certified test method(including field certified), even if these values fall below 50 tg/L
5. Compliance with this limit shall commence on , approximately 48 months from the permit
effective date See Compliance Schedule Condition A. (2).
Page 3 of 8

NPDES Permit NC0086291
6 For a given wastewater sample,TN=TKN+NO3-N+NO2-N,where TN is Total Nitrogen,TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2-N are Nitrate and Nitrite Nitrogen,respectively.
7. Acute WET Testing. Fathead Minnow (Pamephales promelas),24-hour static test,pass/fail, monitoring
only,test at 90%in February,May, August, and November See condition A (4.)
Conditions•
• All samples must be collected from a typical discharge event
• There shall be no discharge of floating solids or foam visible in other than trace amounts
A. (2.) SCHEDULE OF COMPLIANCE (OUTFALL 001) [G.S. 143-215.1(b)]
1 Within one year from the effective day of the permit the Permittee shall submit to the Division of Water
Resources a Corrective Action Plan summarizing the actions to be taken to achieve compliance with the
Total Chloride limits at Outfall 001 and a schedule of activities to implement the Plan.
2 Within two years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
3. Within three years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
4. Within four years from the effective date of the permit submit a report to the Division summarizing actions
taken in accordance with the Corrective Action Plan.
5 Achieve compliance with Total Chlonde limits specified in Section A. (2.)by
Upon approval of the Corrective Action Plan by the Division,the report and actions become an enforceable part
of this permit. Any modifications to the schedule shall be requested to the Division at least ninety(90) days
before the deadline Modifications to the schedule in excess of four months will be subject to public notice.
A. (3.) PERMIT RE-OPENER: WHOLE EFFLUENT TOXICITY [G.S. 143-215.1(b)]
Whole Effluent Toxicity monitoring results indicating aquatic toxicity may result in the Division of Water
Resources re-opening this permit, or requesting by letter that further action be taken Additional metals testing, a
toxicity identification evaluation, a toxicity reduction evaluation, and/or an assessment of discharge treatment
alternatives may be requested
Page 4 of 8

NPDES Permit NC0086291
A. (4.) ACUTE TOXICITY PASS/FAIL MONITORING ONLY (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 2010 or subsequent versions). The monitoring shall be performed as a
Fathead Minnow (Pimephales promelas) 24 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) The tests will
be performed during the months of February,May,August and November.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.
The parameter code for Pamephales promelas is TGE6C. All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form(MR-1) for the month in which it was
performed,using the appropriate parameter code 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 27699-1621
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 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 any month,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,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
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.
Page 5 of 8

NPDES Permit NC0086291
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge monitonng 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.)(a)1
The permittee shall report discharge momtonng data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR) irternet application
Monitoring results obtained dunng 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
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)
Page 6 of 8

NPDES Permit NC0086291
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 electromc 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
Page 7 of 8

NPDES Permit NC0086291
"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 Monitonng Reports, including eDMR submissions These
records or copies shall be maintained for a penod of at least 3 years from the date of the report This penod
may be extended by request of the Director at any time [40 CFR 122 411.
Page 8 of 8

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