NC0086797_Fact Sheet_20180427

DENR/DWR
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES PERMIT NC0086797
Facility Information
Applicant/Facility
Name:
Town of River Bend/Town of River Bend WTP 1 & 2
Applicant Address:
Town of River Bend; 45 Shoreline Dr; River Bend, NC 28562
Facility Address:
52 & 27 Shoreline Dr; River Bend, NC 28562
Permitted Flow:
No permitted flow; maximum monthly average flow Outfall 001=
0.016 MGD, Outfall 002 = 0.015 MGD
Type of Waste:
Treated backwash/rinse wastewater from sand filters
Facility/Permit Status:
Class I /Active; Renewal
County:
Craven County
Miscellaneous
Receiving Stream:
Outfall 001:
Plantation Canal
Outfall 002: UT to
Plantation Canal
Stream Classification:
SB, Sw, NSW
Subbasin:
03-04-11
Index No.:
27-101- 31
Drainage Area (mi2):
Tidal
HUC:
030202040302
Summer 7Q10 cfs
Tidal
303 d Listed?
No
Winter 7Q 10 (cfs):
Tidal
Re Tonal Office:
Washington
30Q2 (cfs):
Tidal
State Grid / USGS
Quad:
G30SW
Pollocksville, NC
Average Flow (cfs):
Tidal
Permit Writer:
Anjali Orlando
IWC (%):
100%
Date: Revised
04/12/2018
BACKGROUND
The Town of River Bend operates two potable water sand filtration treatment plants for its wells
with a combined drinking water capacity of 1 MGD (55% from WTP#1,45% from WTP#2) that
serves the River Bend community. Treated backwash/rinse wastewater discharges through Outfall
001 to Plantation Canal and through Outfall 002 to an unnamed tributary to Plantation Canal; both
class SB, Sw, NSW waters in the Neuse River Basin. The wastewater is drinking water filter
backwash water. Treatment consists of filtration using birm media, sedimentation, and
dichlorination before discharging into the plantation canal, thus the facility is similar to a
conventional water treatment plant.
HISTORY
2008 — Renewal permit issued with some changes from previous permit which applied
Greensand Filter 2004 WTP Strategy guidelines. Permit limited for: Flow, TSS, TRC,
and pH. Settleable solids and turbidity requirements were removed. TRC limit was
corrected to saltwater WQS.
2009 — Issued technical correction for TSS narrative.
2012 — Installed effluent flow meters, began using for reported flow.
2013- Permit was amended to meet the 2009 WTP Permitting Strategy and Guidelines, and also
the 2013 Neuse River Permitting Strategy.
Fact Sheet
NPDES NC0086797
Page 1 of 4

- Flow limit was removed, monitoring was reduced to 2/month, footnotes revised to
reflect operation and reporting.
- Iron monitoring was removed.
- Manganese quarterly monitoring was added.
- Turbidity 2/month monitoring was added.
- TN and TP monitoring was reduced to semi-annual.
- Total Kjeldahl Nitrogen, Nitrite/Nitrate Nitrogen, TMF, TN Load, and special
condition A. (2) was removed.
PROCESS
WTP# 1
Well water is treated with sodium hydroxide, injected with air, and then introduced to a sand filter
unit. There are two wells (#1 & 92) and each well has its own sand filter unit system. Filtered water
combines from the two units, is chlorinated, is treated with a phosphate corrosion inhibitor, and
enters the drinking water distribution system. Each filter is backwash/rinsed as deemed necessary
by the operator. The source of backwash water is from the potable water system. Well water is
used for the rinse cycle.
Backwash/rinse wastewater from each unit flows to a shared treatment system. This system
consists of liquid dechlorination, followed by a settling basin, and then pumps the treated
wastewater through an effluent meter to Outfall 001. Effluent grab sampling is through an
automated system. As needed a contractor removes the collected sludge from the settling basin.
WTP#2
Well (93) water is treated with sodium hydroxide, injected with air, and then introduced to four
sand filter units. Filtered water combines from the four units, is chlorinated, is treated with a
phosphate corrosion inhibitor, and enters the drinking water distribution system. Each filter is
backwash/rinsed as deemed necessary by the operator. The source of backwash/rinse water is from
the potable water system.
Backwash/rinse wastewater from each unit flows to a shared treatment system. This system
consists of liquid dechlorination, followed by a settling basin, and then pumps the treated
wastewater through an effluent meter to Outfall 002. Effluent grab sampling is through an
automated system. As needed a contractor removes the collected sludge from the settling basin.
COMPLIANCE
The facility has had numerous limit violations daily max exceeded for total chlorine reported on
their DMRs. There has been No Action, BPJ taken by Washington Regional Office.
PERMITTING STRATEGY
Since the facility does not use Greensand, but uses Birm Filter Media and does have
sedimentation and filtration as part of their processes, and they have marked on their application
"Conventional- Iron and Manganese Removal", we have changed the strategy from solely
Greensand, which was applied in 2008 and 2013, to a hybrid of Conventional/Greensand and
added acute WET testing to better determine their eligibility for the NCG59 general permit at the
next permit renewal cycle.
Fact Sheet
NPDES NC0086797
Page 2 of 4

SUMMARY OF 2018 CHANGES
Regulatory Citations were added
Because the receiving stream is tidal, Acute WET testing (quarterly, grab, effluent)
was added to the Parameter Table in Part L A (L) and the coordinating footnote 95
added below the table. testing of Mysidopsis Bahia shall be performed as 24-day
pass/fail test at 90% effluent concentration, during March, June, September and
December.
• Condition A. (2.) for Acute Toxicitiy Pass/Fail Monitoring Only (Quarterly) was added to
the list of conditions.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please
contact Anjali Orlando at [phone] or email [e-mail].
REGIONAL OFFICE COMMENTS
Fact Sheet
NPDES NCO086797
Page 3 of 4

NAME:
DATE:
SUPERVISOR:
DATE:
Addendum 12/11/13 - Final Permit
Electronic DMR (eDMR) Compliance Special Condition
To facilitate US EPA guidance on meeting future eDMR reporting, a special condition outlining
Permittee's options, the web site for obtaining forms, and the compliance date, May 1, 2014, was
added to the final permit. The Permittee may apply for a temporary waiver request to comply with
eDMR by March 1, 2013 (60 days prior to the eDMR compliance date), and will be granted a
waiver if the Permittee meets the waiver criteria. If no waiver is applicable the Permittee must
begin submittal of DMR electronically 90 days after the permit effective date. The Permittee will
also be required to submit a signed printed copy of the monthly eDMR to the Division to comply
with current US EPA's Cross -Media Electronic Reporting Regulation. A footnote was added to A.
(1) effluent page for reference to eDMR special condition.
NAME: DATE:
Fact Sheet
NPDES NC0086797
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