HomeMy WebLinkAboutNC0060321_Draft Factsheet_20231213NCDEQ / DWR / NPDES
EXPEDITED FACT SHEET - NPDES PERMIT RENEWAL
NPDES Permit NCO060321
Sara Bassett / Compliance & Expedited Permitting Unit / sara.bassettkdeq.nc.gov / December 2023
FACILITY INFORMATION
Applicant/Facility Name
Edward Riggs Jr. / Manager and Owner
First Craven Sanitary District Water Treatment Plant
Mailing Address
P.O. Box 608 Bridgeton, NC 28519
Facility Physical Address
560 NC Highway 55 East New Bern, NC 28560
Max, Monthly Avg Flow (MGD)
0.0614 MGD
Type of Waste
Backwash from greensand and reject from ion exchange
Facility Class
PC-1
County
Craven
Permit Status
Renewal
Regional Office
WaRO
STREAM CHARACTERISTICS
Receiving Stream
UT to Duck Creek
Stream
Classification
SC; Swamp; NSW
Stream Segment
27-103
Outfall Lat.
35.1228N
7Q10 - Summer (cfs)
Tidal
Outfall Long.
77.0033W
7Q 10 - Winter (cfs)
Tidal
Drainage basin
Neuse
30Q2 (cfs)
Tidal
Subbasin
03-04-10
Average Flow (cfs)
Tidal
HUC
030202040404
IWC (%)
100%
303(d) List
No
FACILITY SUMMARY
The First Craven Sanitary District WTP utilizes greensand iron filters and ion exchange water softeners
with a design potable flow rate of 0.720 MGD that draws raw water from three wells. The treatment for raw
water consists of two aerators, two detention tanks, four ion exchange water softeners, four greensand iron
filtration, and declorination. The discharge produced from the treatment plant is backwash discharge from
the greensand iron filters and water softeners.
The existing treatment components at the water treatment plant are the following:
• 4 greensand iron filters
• 4 ion exchange water softeners
• Dechlorination
Chemical usage consists of -
Potassium permanganate
• Chlorine
• OPO4
• Sulfur Dioxide
Fact Sheet for Permit Renewal
Dec 2023 - NPDES Permit NCO060321 - Page 1
RENEWAL SUMMARY
This renewal contains the following changes:
• The limits for Copper, Lead, and Zinc have been removed as the RPA did not show a reasonable
potential to exceed water quality standards; quarterly monitoring has been implemented for these
parameters.
• Duration of Discharge monitoring has been added in Section A. (1) Effluent Table. The frequency
and sample type were selected following the 2020 strategy guidelines.
• Ammonia Nitrogen monitoring has been removed added in Section A. (1) Effluent Table as this
facility has not reported use of chloramines.
• Section A. (3) in the previous permit outlining the previous compliance schedule has been removed.
• The Supplement to Cover Sheet has been updated with the with new max monthly average.
• The facility grade has been added to Section A. (1).
• Monitoring for Total Iron in Section A. (1) Effluent Table has been removed as there is no longer a
water quality standard, per 2012 WTP guidance.
• Section A. (3) has been updated regarding electronic submission of effluent data. Federal
regulations require electronic submittal of all discharge monitoring reports (DMRs).
COMPLIANCE HISTORY
No violations or enforcements in the last permit cycle
NCG59 GENERAL PERMIT ELIGIBILITY (FOR CONVENTIONAL & GREENSAND ONLY)
• This plant utilizes ion exchange components as well as greensand
• Conclusion: Ineligible for NCG59 General Permit.
WHOLE EFFLUENT TOXICITY (WET) TESTING
The current strategy recommends Acute 24-hr Pass/Fail with Mysid Shrimp [TGE3E] WET testing for
this facility. However, Chronic, 7-day Pass/Fail with Mysid Shrimp at an effluent concentration of 90%
[TGP3E] has been applied instead. This facility has not failed any toxicity tests in the last five years.
From Previous factsheet (Brianna Young):
"No evidence in file of why chronic test at 90% effluent pass/fail limit assigned. Spoke with Cindy Moore
9/29/17 for guidance, but she was unable to explain why chronic testing assigned over acute testing. She
believes decision must have been made to assign the 90% chronic value and that the information is missing
from the file. Renewing with updated chronic 90% pass/fail limit language."
REASONABLE POTENTIAL ANALYSIS
A reasonable potential analysis (RPA) was performed for a discharger going to a saltwater stream. A flow
(Qw) of 0.061 MGD was used based on the maximum, monthly average flow between February 2019 and
October 2023.
Based on this analysis, the following permitting actions are proposed for this permit:
Zinc — no reasonable potential to exceed water quality standards; removing limits from permit and
applying quarterly monitoring
Lead — no reasonable potential to exceed water quality standards; removing limits from permit and
applying quarterly monitoring
Copper — no reasonable potential to exceed water quality standards; removing limits from permit
and applying quarterly monitoring
Fact Sheet for Permit Renewal
Dec 2023 - NPDES Permit NCO060321 - Page 2
COMMENTS ON DRAFT PERMIT
Fact Sheet for Permit Renewal
Dec 2023 - NPDES Permit NC0060321 - Page 3