NC0024937_Authorization to Construct_20180215

Water Resources
ENVIRONMENTAL QUALITY
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
interim Director
February 15, 2018
Ms. Angela Lee
Director, Charlotte Water
City of Charlotte
4222 Westmont Drive
Charlotte, North Carolina 28216
SUBJECT: Authorization to Construct
A to C No. 024937A03
Charlotte Water
Sugar Creek WWTP
NPDES Permit No.NC0024937
Dear Ms. Lee:
A letter of request for an Authorization to Construct was received October 13, 2017, by the
Division of Water Resources (Division), and 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 20 MGD Sugar Creek WWTP, with discharge of
treated wastewater into the Little Sugar Creek in the Catawba River Basin.
This authorization results in no increase in design or permitted capacity and is awarded for
the construction of the following specific modifications:
Replace existing influent pumps with four (4) new submersible non clog 8,980
GPM 135 HP influent pumps with VFD at main lift pump station, piping and
controls; repurpose existing six (6) aeration basins by adding baffles to divide
aerobic and anoxic zones; install six (6) new vertical single speed 1.5 HP mixers
in anoxic swing zone in existing aeration basins; install six (6) 8,030 GPM 40 HP
submersible axial flow internal mixed liquor recycle pumps with VFD, piping and
controls; construct a new splitter box for aeration basins; construct a new blower
building and install five (5) new high speed 400 HP turbo blowers with VFD and
minimum flow capacity of 3,500 SCFM each at 8.2 psi, piping and controls;
installation of new chemical feed facility including two (2) 8,500 gallons chemical
feed tanks with containment and drain, two (2) 65 GPM 3 HP alum feed
recirculation pumps, two (2) 2 GPM 3 HP alum feed pumps for aeration basins,
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.
In addition to the appropriate construction items approved in this Authorization to
Construct, the following items stated in the application were deemed as maintenance events and
require no approval.
State ofNorth Carolina I Environmental Quality 1 Water Resources
512 N Salisbury Street 1 1617 Mail service Center 1 Raleigh, North Carolina 27699-1617
Phone [phone]

Ms. Angela Lee, Director
February 15, 2018
Page 2 of 3
• Launder covers for two clarifiers with electrical and instrumentation
improvements
• In-kind replacement of aeration diffusers
• Replacement of filter media, gates and valves for filters
• Demolition of chlorine contact chamber
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No.
NC0024937 issued effective October 1, 2017, and shall be subject to revocation unless the
wastewater treatment facilities are constructed in accordance with the conditions and limitations
specified in Permit No. NC0024937.
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 5143-215.6A 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 Mooresville Regional Office, telephone number704-663-1699, 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

Ms. Angela Lee, Director
February 15, 2018
Page 3 of 3
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.
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 Trupti Desai at
telephone number [phone].
Sincerely,
RXW &yz�
Linda Culpepper
Interim Director, Division of Water Resources
With Engineer's Certificate attached:
cc: DWR Mooresville Regional Office, Water Quality Programs
Central Files
ecopy: Mr. Brian R. Thorsvold, P.E.
HDR
Email: [e-mail]
NPDES File
Without Engineer's Certificate attached:
cc: Mecklenburg County Health
DWI/Tony Evans and Ken Pohlig