NC0085812_Permit (Issuance)_20240219

DocuSign Envelope ID: 57D7BA90-92C8-4BC1-B2FB-A50DF3783268
ROY COOPER
Giovernor
ELIZABETH S, BISER
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RICE ARD E_ ROOERS, JR-
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NORTH CAROLINA
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February 19, 2024
Mr. Thomas Mann, CIP Program Manager
Union County Water
500 N. Main St. Suite 600
Monroe, North Carolina 28112
SUBJECT: Authorization to Construct
A to C No. 085812AOI
Union County Water
Grassy Branch Water Reclamation Facility
NPDES Permit No. NCO085812
Dear Mr. Mann:
A letter of request for an Authorization to Construct (ATC) was received December 20, 2023,
by the Division of Water Resources (Division). With latest additional information received on
February 14, 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 0.05 MGD Grassy Branch Water Reclamation Facility, with discharge of treated wastewater
into the Crooked Creek in the Yadkin -Pee Dee River Basin.
This authorization results in increase in design and permitted capacity to 0.12 MGD and is
awarded for the construction of the following specific modifications:
Installation of three (3) 165 GPM @ 30 TDH submersible influent pump station pumps, one
(1) 0.47 MGD perforated plate mechanical bar screen, one (1) 0.47 MGD manual bar screen, one
(1) 74,000 gallons equalization basin (reconfigure existing plant with existing blowers), two (2)
60,000-gallon extended aeration single stage nitrification aerobic tanks, three (3) 200 CFM positive
displacement blowers (also used by the clarifiers and digesters), two (2) 17,629-gallon circular
secondary clarifiers, one (1) disk filter unit with two (2) 39 SQFT disc filters, one (1) UV disinfection
with two (2) 235,000/GPD per bank, one (1) 19,000 gallons sludge holding aerobic digestion tank,
chemical feed building with two (2) 0.027 GPM @ 30 TDH Peristaltic hose pumps, one (1) 2 HP
Vertical Turbine Mixer, and 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.
This ATC is issued in accordance with Part III, Paragraph A of NPDES Permit No.
NCO085812 issued effective May 1, 2022, and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in
Permit No. NC0085812.
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DocuSign Envelope ID: 57D7BA90-92C8-4BC1-B2FB-A50DF3783268
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February 19, 2024
Page 2 of 4
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.
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.

DocuSign Envelope ID: 57D7BA90-92C8-4BC1-B2FB-A50DF3783268
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February 19, 2024
Page 3 of 4
You are reminded that it is mandatory for the project to be constructed in accordance with
the North Carolina Sedimentation Pollution Control Act (§ 113A-50.), and when applicable, the
North Carolina Dam Safety Act (NCGS 143-215). 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 Ori Tuvia at
telephone number [phone] or by email at [e-mail].
Sincerely,
IV
DocuSigned by:
eud.AS Vewo(. w
CE9CD2D3C45B4D4...
by Douglas Dowden
Environmental Programs Supervisor II
Industrial Permitting Unit
Division of Water Resources
cc: NPDES Files
ecopy: Michael Parker, PE
Hazen and Sawyer
Email: [e-mail]
DWR Mooresville Regional Office, Water Quality Programs
cc: Union County Health

DocuSign Envelope ID: 57D7BA90-92C8-4BC1-B2FB-A50DF3783268
Union County Water
Grassy Branch WRF
Authorization to Construct No. 085812A0I
Issued February 19, 2024
NPDES Permit No. NC0085812
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 Grassy Branch Water Reclamation Facility, located in Union 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 three (3) 165 GPM @ 30 TDH submersible influent pump station pumps, one (1)
0.47 MGD perforated plate mechanical bar screen, one (1) 0.47 MGD manual bar screen, one (1)
74,000 gallons equalization basin (reconfigure existing plant with existing blowers), two (2)
60,000-gallon extended aeration single stage nitrification aerobic tanks, three (3) 200 CFM
positive displacement blowers (also used by the clarifiers and digesters), two (2) 17,629-gallon
circular secondary clarifiers, one (1) disk filter unit with two (2) 39 SQFT disc filters, one (1)
UV disinfection with two (2) 235,000/GPD per bank, one (1) 19,000 gallons sludge holding
aerobic digestion tank, chemical feed building with two (2) 0.027 GPM @ 30 TDH Peristaltic
hose pumps, one (1) 2 HP Vertical Turbine Mixer, and 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
Date
Registration No.
Mail this Certification to: Attn: Ori Tuvia
NPDES Industrial Permitting Unit
DEQ/DWR/Water Quality Programs
1617 Mail Service Center
Raleigh, NC 27699-1617
SEAL