NC0024970_Authorization to Construct_20210713

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
Angela D. Charles
Director of Utilities
4322 Westmont Drive
Charlotte, North Carolina 28217
Dear Ms. Charles:
NORTH CAROLINA
Environmental Quality
July 13, 2021
SUBJECT: Authorization to Construct
A to C No. 024970Al2
Charlotte Water
McAlpine Creek WWMF
NPDES Permit No. NC0024970
A letter of request for an Authorization to Construct was received June 28, 2021, by the
Division of Water Resources (Division). 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 64.0 MGD McAlpine Creek WWMF, with discharge of treated
wastewater into McAlpine 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:
Modification of Aeration Tanks 7 through 9 and 20 through 25, including the replacement
of existing anaerobic zone mixers with one (1) 3 HP top -mounted hyperboloid mixer in
each aeration tank, and replacement of the existing aeration systems with new flexible
membrane disc diffuser arrays in each aeration tank, piping and controls; in conformity
with the project plans, specifications, and other supporting documentation comprising the
ATC Permit Application package submitted to the Depailment of Environmental Quality.
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No.
NC0029470 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. NC0029470.
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.
�D_E
NORTH CAROLINA
Department of Environmental Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000

Angela D. Charles, Director of Utilities
July 13, 2021
Page 2 of 3
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 number [phone], 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.
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.

Angela D. Charles, Director of Utilities
July 13, 2021
Page 3 of 3
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,
�DocuSigned by:
M L;,1, Xt;e1-0-
'—B0B410C9F6204F7...
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: Peter Schuler, PE
Brown and Caldwell
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs
Without Engineer's Certificate attached:
cc: Mecklenburg County Health
ecopy: DWI/Ken Pohlig, PE