NC0030210_Authorization to Construct_20220819

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Mr. Joseph Wilson
Chief Engineer
Charlotte Water
5100 Brookshire Blvd.
Charlotte, North Carolina 28216
Dear Mr. Wilson:
NORTH CAROLINA
Environmental Quality
August 19, 2022
SUBJECT: Authorization to Construct
A to C No. 030210A04
Charlotte Water
Mallard Creek WRF
NPDES Permit No. NC0030210
A letter of request for an Authorization to Construct was received May 11, 2022, by the
Division of Water Resources (Division). With additional information received on August 16, 2022,
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 12 MGD Mallard
Creek WRF, with discharge of treated wastewater into the Mallard Creek in the Yadkin -Pee Dee River
Basin.
This authorization results in an increase in design and permitted capacity to 16 MGD (skipped
the 14.9 MGD flow tier), provided A to C No. 030210A02 and A to C No. 030210A03 were also
completed, and is awarded for the construction of the following specific modifications:
Liquid Train - Installation of three (3) 27 MGD multirake-type mechanical bar screens, two
(2) 3-foot wide throat Parshall flumes each rated for 30.6 MGD, five (5) 7500 GPM dry -pit
submersible influent pumps, two (2) prestressed concrete flow equalization tanks with one (1)
rated for 5.3 MG storage capacity and the other one (1) rated for 14.7 MG storage capacity,
eight (8) 16 HP submersible mixers for the 5.3 MG equalization tank, one (1) 200 GPM EQ
drain conveyance pump, one (1) 8,000-gallon stainless steel alkalinity storage tank with one
(1) 7.5 HP vertical shaft mixer, three (3) 1.075 GPM alkalinity feed pumps, one (1) activated
carbon adsorption odor control system for influent pump station, 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.
DEQ
NORTH CAROLINA
n.p.rh wm or hmro.m..'r Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611
919.707.9000

Mr. Joseph Wilson, Chief Engineer
August 19, 2022
Page 2 of 4
Solid Train - Replacement of two (2) existing thickening centrifuges with two (2) 767 dry
pounds per hour WAS thickening centrifuges; replacement of one (1) existing dewatering
centrifuge with one (1) 2,500 dry pounds per hour digested sludge dewatering centrifuge;
installation of two (2) 40 GPM thickened WAS pumps; installation of a thickening and
dewatering polymer feed system consisting of two (2) 2,500-gallon polymer storage tanks with
one (1) 3 HP mixer for each tank, two (2) 4 GPM thickening polymer feed pumps, and two (2)
25 GPM dewatering polymer feed pumps; 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: With the fact that the proposed modifications to the liquid train and to the solid train
are designed and stamped by different professional engineers, this permit authorizes the
construction for both trains, but each train has one associated Engineer's Certification. Both
final Engineer's Certification shall be submitted to the Division before the 16 MGD facility may
be operated.]
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No. NC0030210
issued effective February 1, 2020, and shall be subject to revocation unless the wastewater treatment
facilities are constructed in accordance with the conditions and limitations specified in Permit No.
NC0030210.
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.

Mr. Joseph Wilson, Chief Engineer
August 19, 2022
Page 3 of 4
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.
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

Mr. Joseph Wilson, Chief Engineer
August 19, 2022
Page 4 of 4
With Engineer's Certificate attached:
cc: NPDES Files
ecopy: George Anipsitakis, PE
Brown and Caldwell
Email: [e-mail]
George Simon, PE
CDM Smith
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs
Without Engineer's Certificate attached:
cc: Mecklenburg County Health

Charlotte Water
Mallard Creek WRF
Authorization to Construct No. 030210A04
Issued August 19, 2022
NPDES Permit No. NC0030210
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 Mallard Creek Wastewater
Treatment Plant, 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:
Liquid Train - Installation of three (3) 27 MGD multirake-type mechanical bar screens, two (2) 3-foot
wide throat Parshall flumes each rated for 30.6 MGD, five (5) 7500 GPM dry -pit submersible influent
pumps, two (2) prestressed concrete flow equalization tanks with one (1) rated for 5.3 MG storage capacity
and the other one (1) rated for 14.7 MG storage capacity, eight (8) 16 HP submersible mixers for the 5.3
MG equalization tank, one (1) 200 GPM EQ drain conveyance pump, one (1) 8,000-gallon stainless steel
alkalinity storage tank with one (1) 7.5 HP vertical shaft mixer, three (3) 1.075 GPM alkalinity feed
pumps, one (1) activated carbon adsorption odor control system for influent pump station, 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.
This authorization results in an increase in design and permitted capacity to 16 MGD
(skipped the 14.9 MGD flow tier), provided A to C No. 030210A02 and A to C No.
030210A03 were also completed.
[NOTE: With the fact that the proposed modifications to the liquid train and to the solid
train are designed and stamped by different professional engineers, this permit authorizes
the construction for both trains, but each train has one associated Engineer's Certification.
Both final Engineer's Certification shall be submitted to the Division before the 16 MGD
facility may be operated.]
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: Min Xiao, PE
NPDES Industrial Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617

Charlotte Water
Mallard Creek WRF
Authorization to Construct No. 030210A04
Issued August 19, 2022
NPDES Permit No. NC0030210
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 Mallard Creek Wastewater
Treatment Plant, 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:
Solid Train - Replacement of two (2) existing thickening centrifuges with two (2) 767 dry pounds per hour
WAS thickening centrifuges; replacement of one (1) existing dewatering centrifuge with one (1) 2,500 dry
pounds per hour digested sludge dewatering centrifuge; installation of two (2) 40 GPM thickened WAS pumps;
installation of a thickening and dewatering polymer feed system consisting of two (2) 2,500-gallon polymer
storage tanks with one (1) 3 HP mixer for each tank, two (2) 4 GPM thickening polymer feed pumps, and two
(2) 25 GPM dewatering polymer feed pumps; 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 authorization results in an increase in design and permitted capacity to 16 MGD
(skipped the 14.9 MGD flow tier), provided A to C No. 030210A02 and A to C No.
030210A03 were also completed.
[NOTE: With the fact that the proposed modifications to the liquid train and to the solid
train are designed and stamped by different professional engineers, this permit authorizes
the construction for both trains, but each train has one associated Engineer's Certification.
Both final Engineer's Certification shall be submitted to the Division before the 16 MGD
facility may be operated.]
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: Min Xiao, PE
NPDES Industrial Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617
SEAL