NC0089630_Authorization to Construct_20230125

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Ms. Nicole Bartlett
Engineering Division Manager
Charlotte Water
5100 Brookshire Blvd.
Charlotte, North Carolina 28216
Dear Ms. Bartlett:
NORTH CAROLINA
Environmental Quality
January 25, 2023
SUBJECT: Authorization to Construct
A to C No. 089630A03
Charlotte Water
Stowe Regional WRRF
NPDES Permit No. NC0089630
A letter of request for an Authorization to Construct was received October 10, 2022, by the
Division of Water Resources (Division). With additional information received on January 24, 2023,
final plans and specifications for the subject project have been reviewed and found to be satisfactory.
Authorization is hereby granted for the construction of the new 15 MGD Stowe Regional Water
Resources Reclamation Facility, with discharge of treated wastewater into the Catawba River in the
Catawba River Basin.
This authorization is for a new permitted discharge of 15 MGD, and is awarded for the
following specific construction:
Installation of one (1) primary clarifier distribution structure, one (1) primary sludge pump
station consisting of three (3) 111 GPM primary sludge pumps and two (2) 50 GPM primary
scum pumps, one (1) electrical building associated with the primary sludge pump station, and
one (1) BNR distribution structure; construction of two BNR basins of five -stage ML
fermentation with each basin consisting of four (4) 91,000-gallon anaerobic selectors with eight
(8) 2 HP mixers, one (1) 244,000-gallon pre -anoxic zone with two (2) 5 HP mixers, one (1)
245,000-gallon pre -anoxic zone with two (2) 78 GPM FERM pumps, two (2) 11,600 GPM
ARCY pumps, and two (2) 5 HP mixers, one (1) 245,000-gallon swing zone with two (2) 5 HP
mixers, four (4) 260,000-gallon aerobic zones, one (1) 122,000-gallon deoxygenation zone
with four (4) 11,600 GPM NRCY pumps and two (2) 2 HP mixers, two (2) 173,000-gallon post
anoxic zones with four (4) 5 HP mixers, and one (1) 172,000-gallon reaeration zone;
installation of a RAS/WAS pump station consisting of four (4) 5,764 GPM RAS pumps and
two (2) 125 GPM WAS pumps, three (3) 1,200 GPM plant drain pumps, two (2) 440 GPM
SWAS pumps, and all 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.
D_E
NORTH CAROLINA
nopariment at Environmental quoin],
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street I 1611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

Ms. Nicole Bartlett, Engineering Division Manager
January 25, 2023
Page 2 of 3
[NOTE: This 15 MGD Stowe Regional WRRF project consists of three contracts including
headworks, liquid train (excluding headworks), and biosolids holding and transfer facilities.
Each contract contains one or more stages. The Authorization to Construct permits are being
issued, once for each stage. All the final Engineer's Certification shall be submitted to the
Division before the Stowe Regional WRRF may be operated.]
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No. NC0089630
issued effective December 1, 2019, and shall be subject to revocation unless the wastewater treatment
facilities are constructed in accordance with the conditions and limitations specified in Permit No.
NC0089630.
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 Mooresville Regional Office, telephone number 704-663-1699, 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 T 15A: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.

Ms. Nicole Bartlett, Engineering Division Manager
January 25, 2023
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 Min Xiao, PE at
telephone number [phone] or by email at [e-mail].
Sincerely,
DocuSigned by:
B0B410C9F6204F7...
for Richard E. Rogers, Jr.
Director, Division of Water Resources
by Min Xiao, PE
NPDES Industrial Permitting Unit
With Engineer's Certificate attached:
cc: NPDES Files
ecopy: Michael Benchich, PE
Hazen and Sawyer
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs
Without Engineer's Certificate attached:
cc: Mecklenburg County Health

Charlotte Water
Stowe Regional WRRF
Authorization to Construct No. 089630A03
Issued January 25, 2023
NPDES Permit No. NC0089630
Engineer's Certification
I, , as a duly registered Professional Engineer in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the modifications and improvements to the Stowe Regional Water Resources
Reclamation Facility, located in Mecklenburg County, hereby state that, to the best of my
abilities, due care and diligence was used in the observation of the following construction:
Installation of one (1) primary clarifier distribution structure, one (1) primary sludge pump
station consisting of three (3) 111 GPM primary sludge pumps and two (2) 50 GPM primary
scum pumps, one (1) electrical building associated with the primary sludge pump station, and
one (1) BNR distribution structure; construction of two BNR basins of five -stage ML
fermentation with each basin consisting of four (4) 91,000-gallon anaerobic selectors with eight
(8) 2 HP mixers, one (1) 244,000-gallon pre -anoxic zone with two (2) 5 HP mixers, one (1)
245,000-gallon pre -anoxic zone with two (2) 78 GPM FERM pumps, two (2) 11,600 GPM
ARCY pumps, and two (2) 5 HP mixers, one (1) 245,000-gallon swing zone with two (2) 5 HP
mixers, four (4) 260,000-gallon aerobic zones, one (1) 122,000-gallon deoxygenation zone with
four (4) 11,600 GPM NRCY pumps and two (2) 2 HP mixers, two (2) 173,000-gallon post
anoxic zones with four (4) 5 HP mixers, and one (1) 172,000-gallon reaeration zone; installation
of a RAS/WAS pump station consisting of four (4) 5,764 GPM RAS pumps and two (2) 125
GPM WAS pumps, three (3) 1,200 GPM plant drain pumps, two (2) 440 GPM SWAS pumps,
and all 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.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance, intent and in conformity with all applicable regulations and statutes and
the project plans, specifications, and other supporting documentation comprising the
Authorization to Construct Permit Application package.
[NOTE: This 15 MGD Stowe Regional WRRF project consists of three contracts including headworks, liquid
train (excluding headworks), and biosolids holding and transfer facilities. Each contract contains one or more
stages. The Authorization to Construct permits are being issued, once for each stage. All the final Engineer's
Certification shall be submitted to the Division before the Stowe Regional WRRF may be operated.]
Signature Registration No.
Date
Mail this Certification to: Attn: Min Xiao, PE
NPDES Industrial Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617