NC0021156_Authorization to Construct_20100824

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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
August 24, 2010
Mr. James Friday, Director of Utilities
City of Mount Holly
P.O. Box 406
Mount Holly, North Carolina 28120
SUBJECT: Authorization to Construct
A to C No. 021156A02
City of Mount Holly
WWTP Improvements
Gaston County
Dear Mr. Friday:
A letter of request for an Authorization to Construct was received April 19, 2010 by the
Division of Water Quality (Division), and 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 4.0 MGD Wastewater Treatment Plant, with
discharge of treated wastewater into the Catawba River 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:
Installation of an influent screening system consisting a tank mounted rotating
inclined drum fine screen, screw conveyor, and dewatering system rated at 6
MGD peak flow, in conformity with the project plans, specifications, and other
supporting data subsequently filed and approved by the Department of
Environment and Natural Resources.
This Authorization to Construct is issued in accordance with Part III, Paragraph A of
NPDES Permit No. NCO021156 issued December 14, 2006, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0021156.
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.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 � Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 O8 Carolina
Phone: 919.807-M \ FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org atlll'll!!l, J
An Equal Opportunity 1 Affirmative Action Employer

Mr. James Friday, Director of Utilities
August 24, 2010
Page 2
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 [phone], 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, this Authorization to Construct and the
approved plans and specifications. Mail the Certification to: Construction Grants & Loans,
DWQ/DENR, 1633 Mail Service Center, Raleigh, NC 27699-1633.
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 H, 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 approved 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.

Mr. James Friday, Director of Utilities
August 24, 2010
Page 3
Prior to entering into any contract(s) for construction, the recipient must have obtained all
applicable permits from the State.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division in accordance with North
Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct 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.
One (1) set of approved plans and specifications is being forwarded to you. If you have
any questions or need additional information, please contact Seth Robertson, P.E. at telephone
number [phone].
Sincerely,
Coleen H. Sullins
st: sr
cc: Christopher Crotwell, P.E. — Carollo Engineers, P.C., 9115 Harris Corners Pkwy,
Suite 440, Charlotte, NC 28269
Gaston County Health Department
DWQ Mooresville Regional Office, Surface Water Protection
Technical Assistance and Certification Unit
Point Source Branch, NPDES Program
Steve Tsadwa
ATC File 021156A02

City of Mount Holly
A To C No. 021156A02
Issued August 24, 2010
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 City of Mount Holly WWTP,
located on Broome Street in Gaston County for the City of Mount Holly, hereby state that, to the
best of my abilities, due care and diligence was used in the observation of the following
construction:
Installation of an influent screening system consisting a tank mounted rotating
inclined drum fine screen, screw conveyor, and dewatering system rated at 6
MGD peak flow, in conformity with the project plans, specifications, and other
supporting data subsequently filed and approve_ d by the Department of
Environment and Natural Resources.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
Signature
Date
Registration N
Send to: Construction Grants & Loans
DENR/DWQ
1633 Mail Service Center
Raleigh, NC 27699-1633