NC0023884_technical Correction_20141105

Ate-`„
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
Sonja Basinger
Environmental Services Manager
City of Salisbury
1915 Grubb Ferry Rd.
Salisbury, North Carolina 28144
November 5, 2014
John E. Skvarla, III
Secretary
Subject: Error correction
Permit NC0023884
City of Salisbury WWTP
Rowan County
Dear Ms. Basinger:
On October 31, 2014, the Division of Water Resources issued NPDES Permit No. NC0023884 for City of
Salisbury WWTP. It has been brought to our attention that the monitoring frequency for Fecal Coliform in the
new permit is incorrect. Therefore, the Division made a correction to the Effluent Page. The Division also made
a correction and clarification to the location of the liquid chlorination system. Please insert the enclosed
corrected sheets and discard the old sheets. This permit modification becomes effective on the effective date of
the permit.
All other terms and conditions in the original permit remain unchanged and in full effect. These
modifications are issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated
December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this modification are
to you, you have the right to an adjudicatory hearing upon written request within thirty(30)days
following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter
150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, Post Office
Drawer 11666, Raleigh, North Carolina 27604. Unless such demand is made, this decision shall be final and
binding. If you have any questions concerning this permit, please contact Sergei Chernikov at telephone number
[phone].
Thomas A. Reeder
if' Director, Division of Water Resources
cc: Central Files
NPDES Files
Mooresville Regional Office / Water Quality
EPA Region IV (e-copy)
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] Internet: www.ncwaterquality.org
An Equal Opportunity \ Affirmative Action Employer — Made in part by recycled paper

Permit NC0023884
SUPPLEMENT TO PERMIT COVER SHEET
The City of Salisbury is hereby authorized to:
1. Continue to operate and maintain the existing 7.5 MGD Grant Creek Wastewater Treatment Train
consisting of
➢ Influent Parshall flume
> Four mechanical bar screens
➢ Four grit chambers _
➢ Aeration basin with mechanical floating aerators and mixers
D. Two circular clarifiers and two rectangular clarifiers
➢ Four primary clarifiers
D. Two trickling filters
➢ Screw pump lift station
➢ Four aerobic. digesters
➢ Chlorine contact basin with liquid chlorine disinfection
➢ Belt filter press
➢ Standby power generator
➢ Effluent pump station
➢ Flow measurement instrumentation
This treatment train is located on Grubb Ferry Road near Spencer in Rowan County.
2. Continue to operate and maintain the existing 5.0 MGD Town Creek Wastewater TreaLnent Train
consisting of:
> Two mechanical bar screens
➢ Two grit and grease removal units
➢ Two aeration basins with fixed mechanical aerators and mixers
➢ Two secondary clarifiers
➢ Screw pump lift station
➢ Two aerobic digesters
➢ Chlorine contact basin with liquid chlorine disinfection
➢ Standby power generator
➢ Flow measurement instrumentation
> Belt filter press
➢ Effluent pump station
This treatment train is located on Heiligtown Road near East Spencer in Rowan County.
3. Continue to operate and maintain a dechlorination system, ultraviolet system (secondary to liquid
chlorine disinfection), cascade post aerator, Parshall flume, effluent sampling station, standby power
generator and diffuser at the Yadkin River Wastewater Treatment Train.
4. After receiving an Authorization to Construct from the Division, construct and operate a 20.0 MGD
wastewater treatment system.
5. Discharge from the City of Salisbury WWTP at the location specified on the attached map via outfall
001 into the Yadkin River, currently classified WS-V waters in the Yadkin -Pee Dee River Basin.
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Permit NC0023884
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (12.5 MGD)
During the period beginning on the effective date of the permit and lasting until expansion beyond 12.5 MGD, the
Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored' by the
Permittee as specified below:
,EFFLUENT •.. •
CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly- :
Average -
`Weekly
Average
Daily
Maximum
Measurement'
;_ Frequency;
Sample
Type _
Sample
Location'.`
Flow
12.5 MGD7
-
Continuous
- -
Recording
_
Influent or
Effluent
BOD, 5 day, 20 °C
(April 1 to October 31)
15.0 mg/L6
22.5 mg%L--
-----" -
2/Week
Composite
Influent &
Effluent
BOD, 5 day, 20 °C
(November 1 to March 31)
30.0 mg/L6
45.0 mg/L
2/Week
Composite
Influent &
Effluent
Total Suspended Solids
30.0 mg/L6
45.0 mg/L
2/Week
Composite
Influent &
Effluent
NH3 as N
(April 1 to October 31)
6.0 mg/L
18.0 mg/L
2/Week
Composite
Effluent
NH3 as N
(November 1 to March 31)
12.0 mg/L
35.0 mg/L
2/Week
Composite
Effluent
Dissolved Oxygen2
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
200/100 mL
400/100 mL
2/Week
Grab
Effluent
Temperature
Daily
Grab ,
Effluent
pH"
Daily
Grab
Effluent
Total Residual Chlorine¢
28 µg/L
Daily
Grab
Effluent
Total Nitrogen '
(NO2 + NO3 + TKN)
•
Weekly
Composite
Effluent
Total Phosphorus
Weekly
Composite
Effluent
Chronic Toxicity'
Quarterly
Composite
Effluent
Notes:
1. Effluent sampling location is after the Yadkin River Wastewater Treatment Train, except that flow, BOD and
TSS removal efficiency shall be calculated by mathematically aggregating the 'values for the Grant Creek and the
Town Creek Wastewater Treatment Trains. (Refer to A. (6.).)
2. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
3. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
4. Monitoring only applies if chlorine is added to the treatment system. Facility shall report all effluent l'RC values
reported by a NC certified laboratory including field certified. However, effluent values below 50 µg/L will be
treated as zero for compliance purposes.
5. Chronic Toxicity limit (Ceriodaphnia) at 5.3 % with testing in March, June, September and December (see A. (4)).
6. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85 % removal).
7. 7.5 MGD at' Grant Creek treatment train. 5.0 MGD at Town Creek treatment train.
8. 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. (8.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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