NC0020354_Authorization to Construct_20210604

June 4, 2021

John Poteat
Utilities Director
635 East Street
Pittsboro, North Carolina 27312

SUBJECT: Authorization to Construct
A to C No. 020354A03
Town of Pittsboro
Pittsboro WWTP
NPDES Permit No. NC0020354
Dear Mr. Poteat:

A letter of request for an Authorization to Construct was received August 10, 2018, by the
Division of Water Resources (Division). With additional information received on May 25, 2021,
final plans and specifications for the subject project have been reviewed and found to be
satisfactory. Authorization is hereby granted for the construction of modifications to the existing
0.75 MGD Pittsboro WWTP, with discharge of treated wastewater into Robeson Creek in the Cape
Fear River Basin.

This authorization results in no increase in design or permitted capacity and is awarded for
the construction of the following specific modifications:

Construction of a new headworks structure including dual 7.5 MGD peak hour mechanical
bar screens with bypass manual bar screen, dual 7.5 MGD peak hour vortex grit removal systems
with grit classifier systems and Parshall flume flowmeter, one (1) 250 gpm @ 60 TDH suction-lift
grit lift pump with VFD, and one (1) 250 gpm @ 63 TDH suction-lift grit lift pump with VFD;
Construction of a transfer pump station including three (3) 1,600 gpm @ 230 TDH suction-lift
pumps with VFDs, and relocated existing dual 1,500 gpm @ 56 TDH equalization suction-lift
pumps rehabilitated with 40 Hp motors; Construction of new odor control system including an air
scrubber unit and a liquid chemical feed system comprised of two (2) 0.28 gpm @ 20 psig chemical
metering pumps and a 5,300 gallon chemical storage tank; Decommissioning of the existing
influent climber screen, influent pump station, equalization pumps, aeration/clarifiers basins 1 and
2, WAS pumps, tertiary filters, rotary drum thickening, chemical feed systems once the new
headworks and transfer pump station is operable; Conversion of existing 0.3 MG Aeration
Basin/Clarifier #1 to Equalization Tank 3, existing 0.3 MG Aeration Basin/Clarifier #2 to
Equalization Tank 4, and existing 0.150 MG sludge digester tank to Equalization Tank 5;
Installation of new coarse aeration diffusers in Equalization Tank 3 and 4; Construction of a new
drain pump station for Equalization Tanks 3 & 4 including two (2) 600 gpm @ 25 TDH
submersible pumps; Installation of a new refrigerated composite sampler; Installation of a new
emergency 750 kW generator with automatic transfer switch; Construction of a new 30-foot x 30-
foot Administration Building; Installation of an electrical and SCADA control system, and all

John Poteat, Utilities Director
June 4, 2021
Page 2 of 3

necessary piping and controls; in conformity with the project plans, specifications, and other
supporting documentation comprising the ATC Permit Application package submitted to the
Department of Environmental Quality.

This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No.
NC0020354 issued effective June 1, 2021, and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in
Permit No. NC0020354.

It is the Owner’s responsibility to ensure that the as-constructed project meets the
requirements of all applicable regulations and statutes, the ATC Permit Application package, and
all of the requirements contained herein. Failure to comply may result in penalties in accordance
with North Carolina General Statute §143-215.6A through §143-215.6C.

The sludge generated from these treatment facilities must be disposed of in accordance
with G.S. 143-215.1 and in a manner approved by the Division.

In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those as may
be required by the Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.

The Raleigh Regional Office, telephone number 919-791-4200, shall be notified at least
forty-eight (48) hours in advance of operation of the installed facilities so that an on-site inspection
can be made. Such notification to the regional supervisor shall be made during the normal office
hours from 8:00 a.m. until 5:00 p.m. on Monday through Friday, excluding State Holidays.

Upon completion of construction and prior to operation of this permitted facility, a
certification must be received from a Professional Engineer certifying that the permitted facility
has been installed in accordance with the NPDES Permit and the ATC Permit Application package.
Mail the Certification to: Division of Water Resources, WQ Permitting – NPDES, 1617 Mail
Service Center, Raleigh, NC 27699-1617.

Upon classification of the facility by the Certification Commission, the Permittee shall
employ a certified wastewater treatment plant operator to be in responsible charge (ORC) of the
wastewater treatment facilities. The operator must hold a certificate of the type and grade at least
equivalent to or greater than the classification assigned to the wastewater treatment facilities by
the Certification Commission.

The Permittee must also employ a certified back-up operator of the appropriate type and
grade to comply with the conditions of T15A:8G.0202. The ORC of the facility must visit each
Class I facility at least weekly and each Class II, III and IV facility at least daily, excluding
weekends and holidays, must properly manage the facility, must document daily operation and
maintenance of the facility, and must comply with all other conditions of T15A:8G.0202.

John Poteat, Utilities Director
June 4, 2021
Page 3 of 3

A copy of the project plans and specifications shall be maintained on file by the
Permittee for the life of the facility.

During the construction of the proposed additions/modifications, the Permittee shall
continue to properly maintain and operate the existing wastewater treatment facilities at all times,
and in such a manner, as necessary to comply with the effluent limits specified in the NPDES
Permit.
You are reminded that it is mandatory for the project to be constructed in accordance with
the North Carolina Sedimentation Pollution Control Act, and when applicable, the North Carolina
Dam Safety Act. In addition, the specifications must clearly state what the contractor’s
responsibilities shall be in complying with these Acts.

Prior to entering into any contract(s) for construction, the recipient must have obtained all
applicable permits from the State.

The issuance of this ATC does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government agencies
(local, state, and federal) which have jurisdiction.

If you have any questions or need additional information, please contact Nick Coco at
telephone number [phone].

Sincerely,

for S. Daniel Smith
Director, Division of Water Resources

by Min Xiao, PE
NPDES Industrial Permitting Unit

With Engineer’s Certificate attached:
cc: NPDES Files

ecopy: Charles W. Davis, PE
The Wooten Company
Email: [e-mail]
DWR Raleigh Regional Office, Water Quality Programs

Without Engineer’s Certificate attached:
cc: Chatham County Health

ecopy: DWI/Ken Pohlig, PE