NC0068365_Draft Permit_20190724

ROY COOPER
�to SK Governor
~�` MICHAEL S. REGAN
r + Secretary
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LINDA CULPEPPER
Director
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NORTH CAROLINA
Environmental Quality 1
July 24, 2019
Mr. Michael Boaz, Town Manager
Town of Pilot Mountain
124 W Main Street
Pilot Mountain,NC 27041
Subject: Draft NPDES Permit NC0068365
Pilot Mountain WTP
Grade I Physical Chemical WPCS
Surry County
Dear Mr. Boaz:
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. Regulatory citations have been added to the permit.
3. Outfall map has been updated.
4. Language has been updated on the Supplement to Permit Cover Sheet.
5. The components list has been updated on the Supplement to Permit Cover Sheet based on the
permit renewal application.
6. Units of measure have been added in Section A. (1).
7. The facility grade has been added in Section A. (1).
8. Monitoring for turbidity has been reduced to monthly in Section A. (1)per the current water
treatment plant guidance.
9. Limits have been added for copper and monitoring has been increased to monthly in Section A.
(1)per a reasonable potential to exceed water quality standards.
10. Monitoring for total hardness has been added in Section A. (1)per the current water treatment
plant guidance.
11. The instream waste concentration(IWC)has been updated in Sections A. (1) and A. (2)based on
the current maximum monthly average discharge.
12. Updated footnotes in Section A. (1).
13. Toxicity testing language has been updated in Section A. (2).
_1_:_tl .9-S)
North Carolina Department of Environmental Quality I Division of Water Resources
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-9000

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 sampling,upstream of the
discharge,has been added to this permit at a monitoring frequency of quarterly. See Section A.(1.)
Effluent Limitations and Monitoring Requirements.
With this notification,the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Surry 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 919-707-3619, or via e-mail [[e-mail]].
Sincerely,
Brianna Young
Compliance and Expedited Permitting Unit
cc: NPDES Files
Winston-Salem Regional Office
Wastewater Operator Certification Group
WSS/Aquatic Toxicology Branch
Kent Scott, ORC

Permit NC0068365
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 Pilot Mountain
is hereby authorized to discharge treated wastewater from a facility known as
Pilot Mountain Water Treatment Plant (WTP)
953 West Hwy 52 Bypass
Pilot Mountain
Surry County
to receiving waters designated as Toms Creek, withinthe Yadkin-PeeBsin Dee River Basin, in accordance
with effluent limitations,monitoring requirements, and other applicable 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, 2024.
Signed this day
Linda Culpepper
Director, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 8

Permit NC0068365
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.
The Town of Pilot Mountain
is hereby authorized to:
1. Continue to operate a conventional technology water treatment plant with a discharge of wastewaters
from media filter backwash and sedimentation basins. This water treatment plant currently has a
design potable flowrate of 1.5 MGD and a maximum,monthly average wastewater discharge of
0.0104 MGD. This facility is located at the Pilot Mountain WTP, 953 West Hwy 52 Bypass in Pilot
Mountain in Surry County. Water and wastewater treatment consists of:
• Flocculation
• Three(3) settling basins 50,000 gallons each
• Two(2)rapid sand filters
• Two (2) sand drying beds
• Chemicals used include:
o Aluminum sulfate
o Soda ash
o Fluoride
o Zinc-orthophosphate
o Chlorine
2. Discharge from said treatment works via Outfall 001 at a location specified on the attached map,
into Toms Creek [Stream Segment 12-72-14-(4)], a waterbody currently classified C within
Subbasin 03-07-03 [HUC: 0304010109] of the Yadkin Pee-Dee River Basin.
Page 2 of 8

Permit NC0068365
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 via Outfall 001. Such discharges shall be limited
and monitored' by the Permittee as specified below:
LIMITS MONITORING REQUIREMENTS
EFFLUENT CHARACTERISTICS
Parameter Codes 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<6.0 s.u.or>9.0 s.u. 2/month Grab Effluent
Total Residual Chlorine 2 50060 28 pg/L 2/month Grab Effluent
Turbidity(NTU) 00070 Monthly Grab Effluent
Total Copper 01042 161.06 pg/L 180.24 pg/L Monthly Grab Effluent
Total Aluminum(pg/L) 01105 Quarterly Grab Effluent
Total Fluoride(pg/L) 00951 Quarterly Grab Effluent
Total Zinc(pg/L) 01092 Quarterly Grab Effluent
Total Phosphorous(TP) (mg/L) C0665 Quarterly Grab Effluent
Total Nitrogen(TN) (mg/L) C0600 Quarterly Grab Effluent
Hardness—Total as 00900 Monitor&Report Quarterly Grab Effluent
[CaCO3 or(Ca+Mg)]3(mg/L)
Hardness—Total as 00900 Monitor&Report Quarterly Grab Upstream
[CaCO3 or(Ca+ Mg)]4(mg/L)
Chronic WET Testing 5 TGP3B Monitor&Report 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/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/L.
3. Effluent hardness sampling should be performed in conjunction with testing for hardness dependent metals
(cadmium, copper, lead,nickel, silver, 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 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
Page 3 of 8

Permit NC0068365
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.
5. Whole Effluent Toxicity(WET)testing-testing of Ceriodaphnia dubia shall be performed as 7-day pass/fail
test at 4.9%effluent concentration during the months of January,April,July and October[See
Section A. (2)].
Samples shall be taken at the outfall but prior to mixing with the receiving waters.
There shall be no discharge of floating solids or foam in other than trace amounts.
Page 4 of 8

• Permit NC0068365
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 4.9 %. 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
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 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 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.
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,
Page 5 of 8

Permit NC0068365
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 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 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
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.
Page 6 of 8

Permit NC0068365
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-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:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
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Permit NC0068365
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 8 of 8

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NPDES Permit NC0068365 A •�11jy.�/h���i��I►�4j� �
Facility Location Tr��-*k
Receiving Stream:Toms Creek Stream Class: C scale not shown
illa
Stream Segment: 12-72-14-(4) Sub-Basin#:03-07-03i
River Basin:Yadkin Pee-Dee HUC:0304010109 SCALE USGS Quad: Pilot Mountain
County:Surry 1:24,000 36.40028°,-80.48806°