NC0024112_Authorization to Construct_20061221

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
December 21, 2006
The Honorable Joe G. Bennett, Mayor
City of Thomasville
Post Office Box 368
Thomasville, North Carolina 27361-0368
SUBJECT: Authorization to Construct
A to C No. 024112A03
City of Thomasville
Hamby Creek WWTF Improvements
Davidson County
Project No. CS370619-02
Dear Mayor Bennett:
A letter of request for Authorization to Construct was received on December 15, 2006, by
the Division, and final plans and specifications per negotiations with contractor 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 MGD Hamby Creek Wastewater Treatment Plant,
with discharge of treated wastewater into Hamby Creek in the Yadkin -Pee Dee River Basin.
This authorization results in an increase in design and permitted capacity to 6 MGD, and
is awarded for the construction of the following specific modifications:
New influent filter screening equipment; new solids classifier grit removal system; new
oxidation ditch waste treatment system for biological nutrient removal; new final
clarifiers; new effluent filters; new UV disinfection system; new effluent metering
station; new post aeration system; a solids separation system consisting of a new metal
building (1,800 sq. foot) with all solids separation system equipment, two existing
aeration tanks modified to perform as interchange tanks (57,600 cft. each) with aeration
and mixing equipment, provision of two VFD- 3 MGD-RAS pumps; addition of a 15
HP mixer and decanter to digester number 1; a flocculation clarifier; new submersible
pump return sludge pumping stations; new emergency power generating system; new
medium voltage distribution system; upgraded chemical storage and feed facilities; a new
laboratory and administration building addition (960 sq. foot); new controls;
instrumentation and SCADA system; two 350 gpm plant water reuse pumps and
associated waterline; and all associated site work, piping and appurtenances pursuant to
the application received on December 15, 2006, and in conformity with the project plan,
specifications, and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources.
No hCarolina
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper

The Honorable Joe G. Bennett, Mayor
December 21, 2006
Page 2
This Authorization to Construct is issued in accordance with Part III, Paragraph A of
NPDES Permit No. NCO024112 issued June 27, 2005 and shall be subject to revocation unless
the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0024112.
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 North Carolina Division of Water Quality.
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 this Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.
The Winston-Salem 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 Cecil G. Madden, Jr., P.E.,
Construction Grants & Loans, DWQ / DENR, 1633 Mail Service Center, Raleigh, NC 27699-
1633.
Upon classification of the wastewater treatment facilities by the Water Pollution Control
System Operators Certification Commission (WPCSOCC), the Permittee shall designate and
employ a certified operator to be in responsible charge (ORC) and one or more certified
operator(s) to be back-up ORC(s) of the facilities in accordance with 15A NCAC 8G .0201. The
ORC shall visit the facilities in accordance with 15A NCAC 8G .0204 or as specified in this
permit and shall comply with all other conditions specified in these rules.
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.

The Honorable Joe G. Bennett, Mayor
December 21, 2006
Page 3
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division of Water Quality 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 Cecil G. Madden, Jr., P.E. at
telephone number [phone].
Sinnccerely
lan W. Klimek, P.E.
ID:cgm
cc: Mr. Don Garbrick, P.E., Pease Associates, Charlotte
Davidson County Health Department
DWQ Winston-Salem Regional Office, Surface Water Protection
Technical Assistance and Certification Unit
Daniel Blaisdell, P.E.
Point Source Branch, NPDES Program
Cecil G. Madden, Jr., P.E.
Ishwar Devkota, P.E.
SRF