NC0024970_Authorization to Construct_20240614

DocuSign Envelope ID:5046EEB8-6EFF-46B8-93F9-CCD31FF93D00
o,,tHt STATE
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Fy
ROY COOPER u o
Governor
ELIZABETH S.BISER
Secretary *`�`Q.
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
June 14,2024
Joseph C. Wilson,P.E., Chief Engineer
Charlotte Water
5100 Brookshire Blvd
Charlotte,North Carolina 28216
SUBJECT: Authorization to Construct
A to C No. 024970A17
Charlotte Water
McAlpine Creek WWMF
NPDES Permit N.NCO024970
Dear Mr. Wilson:
A letter of request for an Authorization to Construct was received May 17,2024,by the Division of Water
Resources(Division).With additional information received on June 12,2024,final plans and specifications
for the subject project have been reviewed and found to be satisfactory. Authorization is hereby granted
for the construction of modifications to the existing 64 MGD, McAlpine Creek Wastewater Management
Facility, with discharge of treated wastewater into the 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:
• One(1)Final Dewatering Centrate Pump Station consisting of two(2) submersible solids
handling pumps, one(1)duty and one(1) standby, each rated for 350 GPM @ 42 ft TDH with
VFDs.
• Two (2) 66,000-gallon EQ basins, each including one(1)4 HP submersible impeller mixer.
• One(1)Reactor Feed pump station consisting of two (2) submersible solids handling pumps, one
(1)duty and one(1) standby, each rated for 350 GPM @ 116 ft TDH with VFDs.
• One(1)Nutrient Harvesting Facility consisting of:
• One(1) 2,700 ft3 Magnesium Oxide storage silo.
• Two (2) 3,570-gallon Magnesium Oxide make-down tanks, each including one (1) 7.5
HP top entry axial flow mixer.
• Two (2)Magnesium Oxide horizontal centrifugal,open impeller transfer pumps each
rated for 80 GPM @ 65 ft TDH with VFDs.
• Two (2) diaphragm acid feed pumps each rated for 1.67 GPM @ 134 ft TDH.
• One(1)nutrient recovery reactor rated for 2.7 MGD.
• One(1) axial flow reactor recycle pump rated for 11,000 GPM @ 2 ft TDH with VFD.
• One(1) 2.5 HP dewatering screen.
• One(1)vibrating fluidized bed dryer rated for 1,600 lb/hr of Crystal Green®.
• One(1)bucket conveyor rated for 1,600 lb/hr of Crystal Green®.
• One(1) 2.5 HP classifier screen.
• One(1) Crystal Green® storage silo with a total capacity of 1,520 ft3.
• All necessary piping and controls (if applicable); 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 q , North Carolina Department of Environmental Quality (Division of Water Resources
512 North Salisbury Street 11611 Mail Service Center llaleigh,North Carolina 27699-1611
919.707.9000

DocuSign Envelope ID:5046EEB8-6EFF-46B8-93F9-CCD31FF93D00
Mr. Joseph C. Wilson,PE, Chief Engineer
June 14,2024
Page 2 of 3
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No. NC0024970
issued effective January 1, 2024 and shall be subject to revocation unless the wastewater treatment facilities
are constructed in accordance with the conditions and limitations specified in Permit No. NC0024970.
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 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 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 704-235-2100, 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. The
Engineer's Certification form is included with this submittal.
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.All ORC site inspections must be documented in a log
to be on-site and available for review at all times.
A copy of the project plans and specifications shall be maintained on file by the Permittee for
the life of the facility.

DocuSign Envelope ID:5046EEB8-6EFF-46B8-93F9-CCD31FF93D00
Mr. Joseph C. Wilson,PE, Chief Engineer
June 14,2024
Page 3 of 3
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 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,
Do'cIu'Si,,g/ne'd byy:q '^f 'n..''''AA
E
1.1 n VNt C J,6
C464531431644FE...
Michael J. Montebello
NPDES Permitting Branch Chief
Division of Water Resources,NCDEQ
cc: NPDES Files
Mecklenburg County Health
e-copy: John Brinkley, PE, BCEE, D.WRE,CDM Smith
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs

DocuSign Envelope ID:5046EEB8-6EFF-46B8-93F9-CCD31 FF93D00
Charlotte Water
McAlpine Creek WWMF
Authorization to Construct No. 024970A17
Issued June 14,2024
NPDES Permit No.NC0024970
Engineer's Certification
❑ Final Engineering Certification/ ❑ Partial Engineering Certification(mark all that apply)
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 McAlpine Creek Wastewater Management 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 of:
❑ One(1)Final Dewatering Centrate Pump Station consisting of two(2)submersible solids handling pumps,one(1)duty and
one(1)standby,each rated for 350 GPM @ 42 TDH with VFDs.
❑ Two(2)66,000-gallon EQ basins,each including one(1)4 HP submersible impeller mixer.
❑ One(1)Reactor Feed pump station consisting of two(2)submersible solids handling pumps,one(1)duty and one(1)
standby,each rated for 350 GPM @ 116 ft TDH with VFDs.
❑ One(1)Nutrient Harvesting Facility consisting of:
❑ One(1)2,700 ft3 Magnesium Oxide storage silo.
❑ Two(2)3,570-gallon Magnesium Oxide make-down tanks,each including one(1)7.5 HP top entry axial
flow mixer.
❑ Two(2)Magnesium Oxide horizontal centrifugal,open impeller transfer pumps each rated for 80 GPM @ 65
ft TDH with VFDs.
❑ Two(2)diaphragm acid feed pumps each rated for 1.67 GPM @ 134 TDH.
❑ One(1)nutrient recovery reactor rated for 2.7 MGD.
❑ One(1)axial flow reactor recycle pump rated for 11,000 GPM @ 2 ft TDH with VFD.
❑ One(1)2.5 HP dewatering screen.
❑ One(1)vibrating fluidized bed dryer rated for 1,600 lb/hr of Crystal Green®.
❑ One(1)bucket conveyor rated for 1,600 lb/hr of Crystal Green®.
❑ One(1)2.5 HP classifier screen.
❑ One(1)Crystal Green®storage silo with a total capacity of 1,520 ft3.
❑All necessary piping and controls(if applicable);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 substantia
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
NPDESARPA Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh,NC 27699-1617