NC0020761_Technical Correction_20150617

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NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory Donald R. van der Vaart
Governor Secretary
June 17, 2015
Larry Smith
Town Manager
Town of North Wilkesboro
P. O. Box 218
North Wilkesboro,NC 28659
Subject: Technical Correction of NPDES Permit
Permit NCO020761
Thurman Street WWTP
Wilkes County
Class III
SIC 4952
Dear Mr. Smith:
The Division was contacted by Scott Perry, ORC, in regards to the addition of the Total
Residual Chlorine (TRC) narrative and the continued listing of the backup chlorination/dechlorination
system in the June 4, 2015 final permit. Upon further investigation by the Division, the backup
chlorination/dechlorination system reference should have been removed and the addition of the TRC
narrative to the final permit was in error. Mr. Perry was advised there was no permit concerns other
than accuracy at this point, however, Mr. Perry requested that corrected pages be issued to replace the
in error final permit pages.
Enclosed are technical corrected pages for NPDES Permit NC0020761. Please replace the
pages in your current NPDES permit with the corrected pages and discard the removed pages. This
technical correction does not affect any other terms, conditions, or compliance actions covered by the
current permit.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect the
legal requirements to obtain other permits which may be required by the Division of Water Resources
or permits required by the Division of Land Resources,the Coastal Area Management Act or any other
Federal or Local governmental permit that may be required.
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Location:512 N.Salisbury St.Raleigh,North Carolina 27604
Phone:[phone] Fax:[phone]
Internet www.ncdenr.gov
An Equal Opportuni"ffirmative Action Employer

Larry Smith,Town Manager
June 17,2015
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If you have any questions concerning this permit technical correction,please contact Ron Berry
by phone [phone] or by email [e-mail].
S' erely,
. Jay Zimmerman,P.G.
irector, Division of Water Resources
Enclosure: Corrected pages NPDES Permit NC0020761
cc: Winston- Salem Regional Office/Water Quality Programs
Central Files
NPDES File
ecopy: EPA Region IV(Subject SIC 4952)
Email: r4npdespermits(akpa.gov (subject SIC 4952)

Permit NCO020761
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge, are hereby
revoked. [The exclusive authority to operate this facility arises under this permit. The authority to
operate the facility under previously issued permits bearing this number is no longer effective.] The
conditions, requirements, terms and provisions of this permit authorizing discharge under the
NPDES govern discharges from this facility.
Town of North Wilkesboro
is hereby authorized to:
1. Continue to operate an existing 2.0 MGD wastewater treatment facility that includes the
following components:
• Mechanical bar screen with manual bypass bar screen
• Grit chamber
• Influent composite sampler
• Influent pump station with four(4) influent pumps
• Influent flow meter
• Three(3) 0.064 MG primary clarifiers with sludge pump station
• Two (2) 0.5 MG aeration basins with mechanical aerators
• Splitter box
• Four(4) 0.099 MG secondary clarification with RAS and WAS pumps
• Effluent flow meter
• LTV disinfection system
• Effluent composite sampler
• Two (2) 0.279 MG aerobic digestors with blowers
• One (1) 0.03 MG sludge thickener tank with pumps and blower
• One (1) 0.99 MG sludge holding/decant tank with mixer, and truck load out
station and pump
• Six (6) 2,500 ftdrying beds with drain system to headworks(receiving for pump
and haul materials)
• Backup generator
This facility is located at the Thurman Street WWTP (100 Thurman St, North
Wilkesboro)in Wilkes County.
2. Discharge from said treatment works at the location specified on the attached map into
the Yadkin River, currently classified C waters in hydrologic unit 03040101 of the
Yadkin-Pee Dee River Basin.
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Permit NCO020761
(Continued A. (1)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS)
Footnotes:
1. No later than 270 days from the effective date of this permit, begin submitting discharge
monitoring reports electronically using NC DWR's eDMR application system. See special
condition A. (4).
2. U: at least 100 yards upstream from the outfall. D: at least 100 yards downstream from the
outfall. As a member of the Yadkin-Pee Dee River Basin Association, the subject facility is
not responsible for conducting the instream monitoring requirements summarized above.
Should your membership in the Association be terminated, the Division shall be immediately
notified and all instream monitoring requirements will be immediately reinstated.
3. The monthly average effluent BODS and total suspended solids concentrations shall not
exceed 15%of their respective influent value(85%removal).
4. Total Nitrogen (TN) = (NO2-N + NO3-N) + TKN, where (NO2-N + NO3-N) and TKN are
Nitrite/Nitrate Nitrogen and Total Kjeldahl Nitrogen respectively.
5. Chronic Toxicity (Ceriodaphnia) P/F @ 1.6% with testing in January, April, July, and
October, see special condition A. (2). Total Silver shall be sampled to coincide with the
toxicity sample.
6. The permittee shall perform three Effluent Pollutant Scans and four second species toxicity test
during the term of this permit, see special condition A. (3).
b. There shall be no discharge of floating solids or visible foam in other than trace amounts.
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