NC0021474_Permit (Issuance)_20240417

DocuSign Envelope ID: CE821C86-9EOC-4853-A111-423C36AB31El
ROY COOPER
Ciovfvnor
ELIZABETH S, BISFR
Sfrretnry
RICE ARD E_ ROOERS, JR.
D+rprror
NORTH CAROLINA
Erolroflmercral Quality
April 17, 2024
Mr. Chris Rollins, City Manager
City of Mebane
106 E. Washington Street,
Mebane, North Carolina 27302
SUBJECT: Authorization to Construct
A to C No. 021474A04
City of Mebane
City of Mebane WWTP
NPDES Permit No. NCO021474
DWI Project No. SRP-W-ARP-0177
Dear Mr. Rollins:
A letter of request for an Authorization to Construct was received September 15, 2023, by
the Division of Water Resources (Division). With additional information received on April 9, 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
2.5 MGD City of Mebane WWTP, with discharge of treated wastewater into the Moadams Creek
in the Cape Fear River Basin.
This authorization results in an increase in design and permitted capacity to 4 MGD, and is
awarded for the construction of the following specific modifications:
• Four (4) 4,350 GPM @ 41 TDH submersible centrifugal influent pump station pumps
• One (1) 9.4 MGD spiral bar screen, One (1) 9.4 MGD element screen, one (1) 9.4 MGD
Manual bar screen, one (1) 12 MGD vortex grit removal system.
• One (1) 903,000 gallons Equalization basin with two (2) 1500 GPM @ 20 TDH
submersible centrifugal drain pumps and three (3) 250 CFM blowers (also used by the
aerated sludge holding tank) (the equalization basin and pumps are a deductive
alternate)
• Two (2) five -stage biological nutrient removal (BNR) basins, each five -stage BNR will
have three (3) 125,000 gallons anaerobic zones, two (2) 432,000 gallons 1st anoxic
zones, one (1) 1,334,000 gallons aerobic zone, one (1) 235,000 gallons 2nd anoxic
zones and one (1) 42,000 gallons re -aeration zones, three (3) 2.01 HP submersible
anerobic zone mixers, two (2) 5.5 HP submersible 1st anoxic zone mixers, one (1) 5.5 HP
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NORTH CAROLINA 919.707 9000
DWalmenf of Environmental quality

DocuSign Envelope ID: CE821C86-9EOC-4853-A111-423C36AB31E1
April 17, 2024
Page 2 of 5
submersible 2nd anoxic zone mixers, and one (1) 1.5 HP submersible aeration zone
mixers. In addition, three (3) 210 CFM reaeration zone blowers, two (2) 174 CFM post
aeration blowers for both five -stage BNRs.
• Two (2) 95 feet diameter and 17 feet deep circular secondary clarifiers, four (4) 2,110
GPM @ 31 TDH submersible centrifugal RAS pumps, two (2) 200 GPM @ 36 TDH
progressing cavity WAS pumps.
• Four (4) 2,076 square feet deep bed denitrification filters, two (2) 650 GPM @ 29 TDH
end suction centrifugal denitrification filters pumps, two (2) 3,114 GPM @ 28 TDH
denitrification filter backwash end suction centrifugal pumps, two (2) 2,597 CFM
denitrification filter backwash blowers.
• One (1) aerated 3,848 square feet sludge holding tank, three (3) 60 HP submersible
aerated sludge mixers.
• Two (2) 7.3 MGD UV light disinfection parallel channels.
• 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. NCO021474
issued effective November 1, 2023, and shall be subject to revocation unless the wastewater
treatment facilities are constructed in accordance with the conditions and limitations specified in
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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 Winston-Salem Regional Office, telephone number 336-776-9800, 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.

DocuSign Envelope ID: CE821C86-9EOC-4853-A111-423C36AB31E1
April 17, 2024
Page 3 of 5
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.
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.

DocuSign Envelope ID: CE821C86-9EOC-4853-A111-423C36AB31E1
April 17, 2024
Page 4 of 5
If you have any questions or need additional information, please contact Ori Tuvia at
telephone number [phone] or by email at [e-mail].
Sincerely,
Ev
DocuSigned by:
b+s V bw"
CE9CD2D3C45B4D4...
by Douglas Dowden
Environmental Programs Supervisor II
Industrial Permitting Unit
Division of Water Resources
cc: NPDES Files
ecopy: David Honeycutt, PE
McGill Associates, PA
Email: [e-mail]
DWR Winston Salem Regional Office, Water Quality Programs
cc: Alamance County Health
DWI/ Julia Byrd

DocuSign Envelope ID: CE821C86-9EOC-4853-A111-423C36AB31Ell
City of Mebane
City of Mebane WWTP
Authorization to Construct No. 021474A04
Issued April 17, 2024
NPDES Permit No. NCO021474
Engineer's Certification
❑ Final Engineering Certification / ❑ Partial Engineering Certification (mark all that apply)
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 Mebane Wastewater Treatment Plant,
located in Alamance County, hereby state that, to the best of my abilities, due care and diligence was
used in the observation of the following construction of :
❑ Four (4) 4,350 GPM @ 41 TDH submersible centrifugal influent pump station pumps
❑ One (1) 9.4 MGD spiral bar screen, One (1) 9.4 MGD element screen, one (1) 9.4 MGD Manual bar screen, one
(1) 12 MGD vortex grit removal system.
❑ One (1) 903,000 gallons Equalization basin with two (2) 1500 GPM @ 20 TDH submersible centrifugal drain
pumps and three (3) 250 CFM blowers (also used by the aerated sludge holding tank) (the equalization basin and
pumps are a deductive alternate)
❑ Two (2) five -stage biological nutrient removal (BNR) basins, each five -stage BNR will have three (3) 125,000
gallons anaerobic zones, two (2) 432,000 gallons 1st anoxic zones, one (1) 1,334,000 gallons aerobic zone, one
(1) 235,000 gallons 2nd anoxic zones and one (1) 42,000 gallons re -aeration zones, three (3) 2.01 HP
submersible anerobic zone mixers, two (2) 5.5 HP submersible 1st anoxic zone mixers, one (1) 5.5 HP
submersible 2nd anoxic zone mixers, and one (1) 1.5 HP submersible aeration zone mixers. In addition, three (3)
210 CFM reaeration zone blowers, two (2) 174 CFM post aeration blowers for both five -stage BNRs. ❑ Two
(2) 95 feet diameter and 17 feet deep circular secondary clarifiers, four (4) 2,110 GPM @ 31 TDH submersible
centrifugal RAS pumps, two (2) 200 GPM @ 36 TDH progressing cavity WAS pumps.
❑ Four (4) 2,076 square feet deep bed denitrification filters, two (2) 650 GPM @ 29 TDH end suction centrifugal
denitrification filters pumps, two (2) 3,114 GPM @ 28 TDH denitrification filter backwash end suction
centrifugal pumps, two (2) 2,597 CFM denitrification filter backwash blowers.
❑ One (1) aerated 3,848 square feet sludge holding tank, three (3) 60 HP submersible aerated sludge mixers.
❑ Two (2) 7.3 MGD UV light disinfection parallel channels.
❑ 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