NC0042277_Draft Permit_20210209

ROY COOPER
ram .,
Governor F
MICHAEL S.REGAN
Secretary I
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
February 9, 2021
Mr. John Connet,City Manager
City of Hendersonville
160 6th Avenue East
Hendersonville, NC 28792
Subject: Draft NPDES Permit NC0042277
Hendersonville WTP
Grade I Physical Chemical WPCS
Henderson County
Dear Mr. Connet:
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:
1. Language has been updated in Section A.(1) and Section A. (3)to require electronic submission
of effluent data.Federal regulations require electronic submittal of all discharge monitoring
reports(DMRs).
2. Outfall map has been updated.
3. Language on the Supplement to Permit Cover Sheet has been updated (added receiving stream
characteristics and updated facility address).
4. The components list has been updated on the Supplement to Permit Cover Sheet.
5. The facility grade has been added in Section A. (1).
6. Monitoring for TSS, pH, and TRC have been reduced to 2/month in Section A. (1) per current
water treatment plant guidance. These monitoring frequencies were incorrectly changed in the
previous permit renewal.
7. Monitoring for turbidity reduced to monthly in Section A.(1) per current water treatment plant
guidance. This monitoring frequency was incorrectly changed in the previous permit renewal.
8. Monitoring for total zinc and associated footnote have been removed in Section A.(1) as the
facility does not use zinc-orthophosphate in treatment.
9. Monitoring for iron has been removed in Section A. (1) as there is no longer a water quality
standard.
10. Limits for copper have been updated and monitoring frequency has been reduced to quarterly in
Section A. (1).
11. Optional monitoring for ammonia nitrogen and associated footnote have been removed in
Section A. (1)as the facility does not use chloramines in the treatment process.
12. Hardness effluent sample type has been changed to grab sample per current water treatment plant
guidance.
13. Updated the footnotes in Section A.(1).
DE4
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mall Service Center I Raleigh,North Carolina 27699-1617
�� /"� 919.707.9000

14.Toxicity language in Section A. (2) has been updated.
15.The toxicity reopener [formerly Section A. (3)] has been removed per current water treatment
plant guidance.
16.The compliance schedule for Total Copper[formerly Section A.(4)] has been removed.
Please note that the receiving stream is listed as impaired for benthos on the North Carolina 2018 303(d)
Impaired Waters List.Addressing impaired waters is a high priority with the Division, and instream data
will 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.
The EPA approved NC 2015-2019 Water Quality Standard(WQS)Triennial Review includes new
chronic and acute dissolved metal standards for most metals. 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 sampling, upstream of the
discharge,have been added to the permit at a monitoring frequency of quarterly. See Section A.(1)
Effluent Limitations and Monitoring Requirements.
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.
With this notification,the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Henderson 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 fmal permit. If you have questions concerning the draft,please
contact me at 919-707-3619, or via e-mail [[e-mail]].
Sincerely,
r
ro' 4
Brianna Young
NPDES Compliance an Expedited Permitting Unit
cc: NPDES Files
Asheville Regional Office
Wastewater Operator Certification Group
WSS/Aquatic Toxicology Branch
Public Water Supply

Permit NC0042277
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
City of Hendersonville
is hereby authorized to discharge wastewater from a facility located at the
Hendersonville WTP
4139 Haywood Road
Mills River
Henderson County
to receiving waters designated as Brandy Branch in the French Broad 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
This permit and the authorization to discharge shall expire at midnight on February 28, 2026.
Signed this day
S.Daniel Smith
Director,Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

Permit NC0042277
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 Hendersonville
is hereby authorized to:
1. Continue to operate a conventional drinking water treatment facility with a discharge of treated
wastewaters from filter backwash and settling basins. This water treatment plant currently has a
design potable flowrate of 12.0 MGD and a maximum, monthly average wastewater discharge of
approximately 0.283 MGD.This facility is located at the Hendersonville Water Treatment Plant at
4139 Haywood Road in Mills River in Henderson County.Water and wastewater treatment consist
of:
• Two(2) flash mixers
• Five(5) 92,000 gallon flocculators
• Five(5) sedimentation basins
• Four(4) 18,000 gallon multimedia gravity filters
• Transfer pump station
• Two(2) 500,000 gallon clarifiers/ sludge thickeners
• Centrifuge system for sludge dewatering
• Dechlorination system
• Outfall meter with recorder
• Chemical usage consists of:
o Poly-aluminum chloride
o Sodium hydroxide(caustic)
o Chlorine
o Hydrofluosilicic acid
o Sodium bicarbonate
o Poly/orthophosphate blend
2. Discharge from said treatment works at the location specified on the attached map into Brandy
Branch [Stream Segment:6-54-6], a waterbody currently classified WS-III in subbasin 04-03-03
[HUC:060101050403] in the French Broad River Basin.
Page 2 of 8

Permit NC0042277
PART I.
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B.0400 et seq., 15A NCAC 02B.0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge treated backwash wastewater from outfall 001. Such discharges shall be
limited and monitored' by the Permittee as specified below:
EFFLUENT CHARACTERISTICS LIMITS MONITORING REQUIREMENTS
Parameter Code Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow(MGD) 50050 Continuous Recording Effluent
Total Suspended Solids C0530 30.0 mg/L 45.0 mg/L 2/Month Grab Effluent
pH 00400 Not more than 9.0 s.u.nor 2/Month Grab Effluent
less than 6.0 s.u.
Total Residual Chlorine 2 50060 17 pg/L 2/Month Grab Effluent
Turbidity(NTU) 00070 Monthly Grab Effluent
Aluminum(pg/L) 01105 Quarterly Grab Effluent
Total Copper 01042 15.28 pg/L 20.06 pg/L Quarterly Grab Effluent
Fluoride(mg/L) 00951 Quarterly Grab Effluent
Manganese(pg/L) 01055 Quarterly Grab Effluent
Total Nitrogen(mg/L) C0600 Quarterly Grab Effluent
TN=(NOrN+NO3-N)+TKN
Total Phosphorus(mg/L) C0665 Quarterly Grab Effluent
Hardness(mg/L) 34 00900 Quarterly Grab Effluent
Total as[CaCO3 or(Ca+ Mg)]
TotalsHardn ss(mg/L) 34 00900 Quarterly Grab Upstream
Total as[CaCO3 or(Ca+ Mg)]
Chronic Toxicity9 TGP3B Quarterly Grab Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the NC DWR's eDMR
application system[see Section A.(3)].
2. 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/1.
3. Effluent Hardness sampling should be performed in conjunction with testing for hardness dependent metals
(copper and zinc).
4. 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 Perm ittee 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.
Page 3 of 8

Permit NC0042277
5. Chronic 7 day test,P/F,(Ceriodaphnia dubia)at 90%during the months of February,May,August,and
November[see Section A.(2)].
All samples collected must be of a representative discharge.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 8

Permit NC0042277
A. (2) CHRONIC TOXICITY PASS/FAIL 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 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
h below all treatment processes.
effluent discharge
�
All toxicity testing results required as part of this permit condition will be entered electronically using
the Division's eDMR system for the month in which it was performed,using the parameter code
TGP3B.Additionally,DWR Form AT-i(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, [e-mail].
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 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,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 Resources indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
Page 5 of 8

Permit NC0042277
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-DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs) and program
reports.The fmal 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)l
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. The eDMR system may be
accessed at:https://deq.nc.gov/about/divisions/water-resources/edmr.
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
following address:
NC DEQ/Division of Water Resources /Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting" section below.
Page 6 of 8

Permit NC0042277
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 21,2025,the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports;and
• Clean Water Act(CWA)Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see"How to Request a
Waiver from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time
of each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from N PDES-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-d ischarge-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.
Page 7 of 8

Permit NC0042277
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)j
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/ed mr
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 quaked 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 offines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D.(6.)I
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 8 of 8

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NPDES Permit NC0042277 A �'�r ktOill�i IN iii ►im��
Facility Location "pa. i`�
Receiving Stream: Brandy Branch Stream Class:WS-III scale not shown
Stream Segment:6-54-6 Sub-Basin#:04-03-03 AV
River Basin: French Broad HUC:060101050403 SCALE USGS Quad:Skyland
County: Henderson 1:24,000 35.38528°,-82.55833°