NC0057606_NC0057606 Draft Factsheet 2023_20230926

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO057606
Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinsonkdeq.nc.gov / Sept 2023
FACILITY INFORMATION
Applicant/Facility Name
Town of Stantonsburg (Coley H. Rhodes, Mayor)
Stantonsburg WWTP
Applicant Address
PO Box 10, Stantonsburg, NC 27883
Facility Physical
Address/Mailing Address
7655 Peacock Bridge Road, Stantonsburg, NC 27883
Permitted Flow (MGD)
0.375 MGD
Type of Waste
Municipal, <1 MGD
Facility Class
WW-2
County
Wilson
Permit Status
Renewal
Regional Office
RRO
STREAM CHARACTERISTICS
Receiving Stream
Contentnea Creek
Stream
Classification
C-Swamp NSW
Stream Segment
27-86-(7)
Outfall Lat.
350 34' 59" N
7Q10 - Summer (cfs)
8.33
Outfall Long.
770 48' 00" W
7Q10 - Winter (cfs)
20.83
Drainage basin
Neuse River Basin
30Q2 (cfs)
40.61
Subbasin
03-04-07
Average Flow (cfs)
420.56
HUC
030202030405
IWC (%)
6.52% (summer) /
2.71% (winter)
303(d) List
Yes — added to the 303 (d)
list in 2008 for Benthos
exceeding criteria. Remains
on the list.
BASIC INFO
FOR EXPEDITED PERMIT RENEWAL
Added monthly and weekly NH3 as N limits for the summer
months (April 1— October 31) based on the IWC calculations and
Does permit need Daily Max
2016 NH3 guidance document. The monthly average summer
NH3 limits?
limit for NH3 as N will be 12.2 mg/L and the weekly average
summer limit will be 35 mg/L. No winter limit for NH3 as N is
required.
No — already present; The permit contains primarily UV disinfectio
however, in the event of a UV system failure, Section A. (4) descri
Does permit need TRC
chlorine compounds may be used as a temporary means of disinfect
limits/footnote?
Section A. (4) also states that TRC must be monitored while this dill
method is in use and the TRC values must be reported on the disch
monitoring report. Section A. (4) also states that TRC in the effluen
exceed 28 µg/L while chlorine compound disinfection is in use.
Does permit have toxicity
No — not a complex wastestream
testing?
Does permit have any Special
Yes — total nitrogen loads, total nitrogen allocations, effluent
Conditions?
mercury analysis, Neuse nutrient reopener, and temporary means
of disinfection
Does permit have instream
Yes — U & D for Temperature and Dissolved Oxygen
monitoring?
Fact Sheet for Permit Renewal
Sept 2023 - NPDES Permit NCO057606 - Page 1

New expiration date: I Oct 31, 2028
FACILITY SUMMARY
The Town of Stantonsburg operates a wastewater treatment plant that serves a population of 1,275
residents. Stantonsburg WWTP is a minor municipal facility (flow < 1 MGD) with a design capacity and
permitted wastewater discharge of 0.375. The original NPDES permit for this facility was issued in
February 1984. This facility utilizes the following treatment components:
• Mechanical bar screen
• Wet well with three pumps to oxidation ditch
• Oxidation ditch with drive tube
• Secondary clarifier
• Aerobic digester
• Sludge pumping station
• Intermediate pumping station
• RAS/WAS station
• Gas chlorination in wet well and discharge piping (back up only)
• UV disinfection
• Sodium bisulfate dechlorination (back up only)
• Parshall flume effluent flow measurement
• Back-up generator
• Digester w/blowers
• —1.25 miles of discharge piping
• Cascade post aeration
RENEWAL SUMMARY
This renewal contains the following changes:
• Added Neuse nutrient reopener condition for all Neuse River discharge permits to Part I. A. (6).
• Updated eDMR language for electronic data submission in Part L A. (7).
• Added NH3 as N Summer effluent limits to Part L A. (1).
COMPLIANCE HISTORY
Stantonsburg WWTP has had five enforcements (one in 2019, three in 2021, and one in 2023). This facility
has been issued seven NOVs in 2019 and 2020 for pH, dissolved oxygen, fecal coliform, and flow limit
violations. This facility has been issued one NOD in 2018 for a monthly average exceedance of flow and
one NOD in 2022 for a weekly geometric mean exceedance of fecal coliform. Most recent inspection
(February 2022) showed the facility to be in compliance.
EFFLUENT MERCURY ANALYSIS
The permittee is required to provide one effluent mercury analysis, using EPA Method 1631E, in conjunction with
the next permit renewal application. The analysis should be taken within 12 months prior to the application date.
Any additional effluent mercury measurement conducted from the effective day of this permit and up to the
application date shall also be submitted with the renewal application. Mercury analysis was completed
September 28, 2022 and was submitted with the renewal application (which was received January 27,
2023). The results of the analysis are shown below:
COMER - Mercury, Total Metal Grab ng/1 <1 DLYVALUE Effluent
(as Hg) - Concentration
Fact Sheet for Permit Renewal
Sept 2023 - NPDES Permit NCO057606 - Page 2