NC0089630_Authorization to Construct_20240201

DocuSign Envelope ID:23lD6127-7C9D-4AOA-A9C6-94A6D405A5A1
ot�,STATE w
ROY COOPER -
Governor v l
ELIZABETH S.BISER
Secretary
RICHAM E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
February 1, 2024
Mr. Joseph C. Wilson
Chief Engineer
Charlotte Water
5100 Brookshire Blvd.
Charlotte,North Carolina 28216
SUBJECT: Authorization to Construct
A to C No. 089630A06
Charlotte Water
Stowe Regional WWRF
NPDES Permit No. NCO089630
Dear Wilson:
A letter of request for an Authorization to Construct was received October 31,2023,by the
Division of Water Resources (Division). With additional information received on January 30,
2024, 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:
Construction of two (2)440 GPM @ 1% dry solids pressurized solids screening systems, Two (2)
312,000-gallon solids storage tanks, One (1) 8.3 HP WAS storage tank mixer submersible mixer
and one (1) 12.1 HP submersible primary solids storage tank mixer, One (1) odor control slab
consisting of two (2) centrifugal blowers, one (1) duty and one (1) standby, each rated for 12,200
cfm with VFDs, one (1) 12,200 scfm biotrickling filter/bioscrubber vessel, two (2) recirculation
pumps sufficiently sized by the supplier, one (1) 150-gallon nutrient feed tank, one (1) nutrient
feed pump sufficiently sized by the supplier; 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.
[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.
NCO089630 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.
North Carolina Department of Environmental Quality I Division of Water Resources
D E Q�� 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh,North Carolina 27699-1611
Noanica�o�ru 919.707.9000
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DocuSign Envelope ID:231D6127-7C9D-4AOA-A9C6-94A6D405A5A1
Mr. Joseph C. Wilson,PE,Chief Engineer
February 1,2024
Page 2 of 3
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. Also, please email to Nick Coco, PE at
[e-mail].
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.0201. 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.0204.
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

DocuSign Envelope ID:231D6127-7C9D-4AOA-A9C6-94A6D405A5A1
Mr. Joseph C. Wilson,PE,Chief Engineer
February 1,2024
Page 3 of 3
Dam Safety Act. In addition, the specifications must clearly state what the contractor's
responsibilities shall be in compliance 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, PE at
telephone number(919) 707-3609 or by email at [e-mail].
Sincerely,
DocuSigned by:
CE9CD2D3C45B4D4...
Douglas Dowden
Supervisor,NPDES Industrial Permitting Unit
Attachments: Engineer's Certification
cc: NPDES Files
ecopy: Laurin Kennedy, PE
CDM Smith
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs
Without Engineer's Certificate attached:
cc: Mecklenburg County Health

DocuSign Envelope ID:231D6127-7C9D-4AOA-A9C6-94A6D405A5A1
Charlotte Water
Stowe Regional WRRF
Authorization to Construct No. 08963A06
Issued February 1, 2024
NPDES Permit No. NCO089630
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 Resource
Recovery 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:
Construction of two (2)440 GPM @ 1% dry solids pressurized solids screening
systems, Two (2) 312,000-gallon solids storage tanks, One (1) 8.3 HP WAS
storage tank mixer submersible mixer and one (1) 12.1 HP submersible primary
solids storage tank mixer, One (1) odor control slab consisting of two (2)
centrifugal blowers, one (1) duty and one (1) standby, each rated for 12,200 cfm
with VFDs, one (1) 12,200 scfm biotrickling filter/bioscrubber vessel, two (2)
recirculation pumps sufficiently sized by the supplier, one (1) 150-gallon nutrient
feed tank, one (1) nutrient feed pump sufficiently sized by the supplier; 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.
Signature Registration No.
Date
Mail this Certification to: Attn: Ori Tuvia SEAL j
NPDES Industrial Permitting Unit /
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh,NC 27699-1617 --