WQ0034367_Correction_20220829

August 29, 2022
D AVID M. M OHR, PE C HIEF O PERATIONS O FFICER
O NSLOW W ATER AND S EWER A UTHORITY
228 G EORGETOWN R OAD
J ACKSONVILLE, N ORTH C AROLINA 28540
Subject: Permit No. WQ0034367
Correction
Northwest Regional WWTP
High-Rate Infiltration System
Onslow County
Dear Mr. Mohr:
In accordance with your written request received August 22, 2022, we are forwarding herewith a
corrected Page 1 of Permit No. WQ0034367 issued July 1, 2022.
The corrections to the subject permit are as follows:
1. The facility description has been revised to more accurately describe the system:
a. The fine screen grit removal system is served by one 1.3 cubic foot per minute (CFM)
positive displacement blower.
b. The 822,000 gallon post flow equalization basin is served by one 4,943 gallon per minute
(GPM) jet motive mixing pump.
c. The two tertiary disc filter units are served by one 5,000 gallon backwash water supply
tank.
d. The chlorine disinfection system is served by a 2,500 gallon sodium hypochlorite tank with
two 40 gallon per hour (GPH) peristaltic chemical metering pumps.
Please replace Page 1 of Permit No. WQ0034367 issued July 1, 2022 with the enclosed
corrected Page 1.
If you need additional information concerning this permit correction, please contact Lauren Raup-
Plummer at [phone] or [e-mail].
Sincerely,
Richard E. Rogers, Jr., Director
Division of Water Resources
Enclosure

Mr. David M. Mohr
August 29, 2022
Page 2 of 2
cc:OnslowCounty Health Department(Electronic Copy)
Wilmington Regional Office, Water Quality Regional Operations Section (Electronic Copy)
Patrick Beggs - Protection and Enforcement Branch (Electronic Copy)
Laserfiche File (Electronic Copy)
Digital Permit Archive (Electronic Copy)

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENTAL QUALITY
RALEIGH
HIGH-RATE INFILTRATION SYSTEM PERMIT

In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Onslow Water and Sewer Authority
Onslow County
FOR THE
operation of a 1,272,973 gallon per day (GPD) wastewater treatment and high-rate infiltration facility
consisting of the:
continued operation of a 2,000,000 GPD wastewater treatment facility consisting of: a plant drain pump
station with two 1,400 gallon per minute (GPM) submersible pumps; an influent flow meter; one fine screen
grit removal system served by one 1.3 cubic foot per minute (CFM) positive displacement blower; a bypass
manually-cleaned coarse screen; a flow splitter box; an influent composite sampler; two 1,830,000 gallon
sequencing batch reactors (SBRs) served by five 1,156 CFM positive displacement blowers, three 9,886
GPM axial flow jet motive pumps, an SBR influent transfer pump station with two 3,400 GPM centrifugal
pumps, and a waste activated sludge (WAS) pump station with three 516 GPM centrifugal pumps; two
614,000 gallon aerobic sludge digesters served by three 780 CFM positive displacement blowers, a WAS
flow meter, one 4,395 GPM jet-motive mixing pump, two 350 GPM centrifugal sludge transfer pumps, two
250 GPM submersible supernatant pumps, and a supernatant flow meter; an 822,000 gallon post flow
equalization basin with one 4,943 GPM jet motive mixing pump and three 1,400 GPM centrifugal transfer
pumps; a post flow equalization basin flow meter; two tertiary disc filter units with one 5,000 gallon
backwash water supply tank, two 98 GPM primary backwash pumps, and two 98 GPM auxiliary backwash
pumps; a 3,472 GPM ultraviolet (UV) disinfection system consisting of a 1,000 gallon open-vessel UV
tank with three banks in series each containing 32 UV lamps per bank (96 lamps total); a 75,000 gallon
chlorine contact basin served by a 2,500 gallon sodium hypochlorite tank with two 40 gallon per hour
(GPH) peristaltic chemical metering pumps; an 11,500 gallon effluent pump station with three 1,850 GPM
submersible pumps; an effluent residual chlorine analyzer; an effluent sampler with a hose pump; a
turbidimeter; a 1,500 kilowatt (kW) automatically activated auxiliary generator; an alum feed system with
a 7,000 gallon tank and three 40 GPH peristaltic chemical metering pumps; a sodium hydroxide feed system
with a 10,000 gallon tank and three 40 GPH peristaltic chemical metering pumps; a micro-C glycerin feed
system with a 10,000 gallon tank and two 40 GPH peristaltic chemical metering pumps; two synthetically-
lined 5-day upset basins served by the aforementioned plant drain pump station with both basins having an
effective volume of 2,734,829 gallons; and all associated piping, valves, controls, and appurtenances; the
continued operation of a non-potable reuse system for internal use within the treatment plant works deemed
permitted pursuant to 15A NCAC 02U .0113(a)(16) and consisting of: two 170 GPM submersible pumps;
two 800 gallon steel hydropneumatic tanks; and all associated piping, valves, controls, and appurtenances;
the
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