NC0031828_NC0031828 Draft Factsheet 2023_20230926

NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO031828
Caroline Robinson / Compliance & Expedited Permitting Unit / caroline.robinsonkdeg.nc. oovv / September 2023
FACILITY INFORMATION
Applicant/Facility Name
Town of Vanceboro (Chad Braxton, Mayor)
Vanceboro WWTP
Applicant Address/Mailing
Address
PO Box 306, Vanceboro, NC 28586
Facility Physical Address/
7749 US Highway 17 (South Main Street), Vanceboro, NC 28586
Permitted Flow (MGD)
0.30 MGD
Type of Waste
Municipal Wastewater Discharge <1 MGD
Facility Class
WW-3
County
Craven
Permit Status
Renewal
Regional Office
WaRO
STREAM CHARACTERISTICS
Receiving Stream
Swift Creek
Stream
Classification
C-Swamp NSW
Stream Segment
27-97-(0.5)
Outfall Lat.
350 17' 42" N
7Q10 - Summer (cfs)
0.75
Outfall Long.
770 08' 53" W
7Q10 - Winter (cfs)
5
Drainage basin
Neuse
30Q2 (cfs)
—
Subbasin
03-04-09
Average Flow (cfs)
270
HUC
030202020506
0
IWC (/o)
38.27% (summer) /
8.51% (winter)
303(d) List
Yes, added to the 303 (d) list
in 1998 for Benthos (Nar,
AL, FW) exceeding criteria.
Remains on the list.
BASIC INFO FOR EXPEDITED PERMIT RENEWAL
Does permit need Daily Max NH3 limits?
No — Already present
Does permit need TRC limits/footnote?
No — Already present
Does permit have toxicity testing?
No — not a complex wastestream
Does permit have any Special Conditions?
Neuse nutrient conditions and effluent mercury analysis
Does permit have instream monitoring?
Yes — U & D for Dissolved Oxygen and Temperature
New expiration date:
Oct 31, 2028
FACILITY SUMMARY
The Town of Vanceboro operates a wastewater treatment plant that serves a population of 1,005 residents.
The Vanceboro WWTP is a minor facility (flow < 1 MGD) with a design capacity and permitted
wastewater discharge of 0.30. The original NPDES permit for this facility was issued in December 1981.
This facility utilizes the following treatment components:
• Manual bar screen
• Grit removal
• Two (2) parallel mechanically operated aerated oxidation ditches
• Three (3) parallel secondary clarifiers
• Tertiary sand filters
• Alum feed for phosphorus removal
Fact Sheet for Permit Renewal
Sept 2023 - NPDES Permit NCO031828 - Page 1

• Polymer feed for alum sludge conditioning
• Gas chlorination
• Chlorine contact chamber
• Dechlorination
• Cascade post aeration
• Automatic samplers
• Flow meter
• Aerobic sludge digesters
• Sludge drying beds
• Standby power
PERMIT MODIFICATIONS SINCE LAST PERMIT:
Mayor Chad Braxton requested relief from the increased monitoring frequency requirements imposed in the
permit renewal. These increased monitoring frequencies were applied to the permit per 15A NCAC 02B
.0508 as the facility was reclassified from WW-2 to WW-3. The facility did not have any significant
component changes, and the classification upgrade was made based on nutrient limits present in the permit
per 15A NCAC 08G .0302(e). Monitoring frequency for facilities with no significant changes to more
advanced treatment technology between permit renewals will not be required to adhere to the increased
monitoring frequencies when facility grade is increased due to presence of nutrient limits in the permit. The
Division is in the process of creating a new policy regarding facilities in this situation.
On September 20, 2019, a Change -Page to Address Modification was submitted to the City of Vanceboro
with the following changes:
Monitoring reduced to weekly in A(1) for pH, dissolved oxygen, BOD, total suspended solids, NH3
as N, fecal coliform, and upstream and downstream temperature as a policy is process to address
these types of facilities and permits
Monitoring reduced to 2/week for TRC in A(1) as a policy is process to address these types of
facilities and permits
Compliance schedule removed in A(1) as footnotes 9 and 10 as increased monitoring no longer
applies
RENEWAL SUMMARY
This renewal contains the following changes:
• Added a reopener condition for all Neuse River discharge permits in Part L A. (6.).
• Updated electronic data submission requirements.
COMPLIANCE HISTORY
Vanceboro WWTP has had three enforcements since 2019 for limit violations and a permit condition
violation. The facility has been issued five NOVs for weekly average and weekly geometric mean
exceedances of BOD, Coliform, and TSS in 2019 and 2023, and six NODS for weekly geometric mean,
monthly average, and weekly average exceedances of coliform, flow, and NH3 as N in 2021 and 2022.
Most recent inspection (August 2023) showed the facility to be in compliance.
COMMENTS ON DRAFT PERMIT
• Robbie Bullock (Washington Regional Office, Environmental Program Consultant) noted that he
had no recommended permit changes for the violations noted.
Fact Sheet for Permit Renewal
Sept 2023 - NPDES Permit NCO031828 - Page 2

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 October 13, 2022 and was submitted with the renewal application
(which was received October 31, 2022). The results of the analysis are shown below:
COMER - Mercury, Total Metal Grab ng/1 1.7 DLYVALUE Effluent
(as Hg) - Concentration
Fact Sheet for Permit Renewal
Sept 2023 - NPDES Permit NCO031828 - Page 3