NC0026051_Authorization to Construct_20101122

ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
November 22, 2010
Mr. Joseph R. Pearce, P.E.
Durham County
5926 NC Highway 55 East
Durham, North Carolina 27713
SUBJECT: Authorization to Construct
A to C No. 026051A02
Durham County
Durham County Triangle WWTP
Project No. CS370575-02
Durham County
Dear Mr. Pearce:
A letter of request for an Authorization to Construct was received July 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 12.0 MGD Wastewater Treatment Plant, with
discharge of treated wastewater into Northeast Creek in the Cape Fear 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 a 0.5 million gallon recycle stream flow equalization basin, a
recycle stream flow equalization basin pump station with dual 800 gpm pumps
and flow meter, two (2) 500,000 gallon sludge holding tanks, a dewatering system
to include three (3) centrifuges each with a 175 gpm sludge feed rate (2 duty and
1 stand-by), and a sludge truck loading facility, 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. NC0026051 issued September 18, 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. NC0026051.
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
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet: www.ncwaterquality.org
An Equal opportunity 1 Affirmative Action Employer
NorthCarolina
Naturally

Mr. Joseph R. Pearce, P.E.
November 22, 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 Raleigh 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 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.
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.
Prior to entering into any contract(s) for construction, the recipient must have obtained all
applicable permits from the State.

Mr. Joseph R. Pearce, P.E.
November 22, 2010
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 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
MM:sr
cc: David M. Heiser, P.E., McKim & Creed, P.A., 1730 Varsity Dr. Raleigh, NC 27606
Durham County Health Department
DWQ Raleigh Regional Office, Surface Water Protection
Technical Assistance and Certification Unit
Point Source Branch, NPDES Program
Michelle McKay, E.I.
SRF File

Durham County
A To C No. 026051A02
Project No. CS370575-02
Issued November 22, 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 Durham County Triangle WWTP,
located on NC Highway 55 in Durham County for the County of Durham, hereby state that, to
the best of my abilities, due care and diligence was used in the observation of the following
construction:
Installation of a 0.5 million gallon recycle stream flow equalization basin, a
recycle stream flow equalization basin pump station with dual 800 gpm pumps
and flow meter, two (2) 500,000 gallon sludge holding tanks, a dewatering system
to include three (3) centrifuges each with a 175 gpm sludge feed rate (2 duty and
1 stand-by), and a sludge truck loading facility, in conformity with the project
plans, specifications, and other supporting data subsequently filed and approved
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 Registration No.
Date
Send to:
Construction Grants & Loans
DENR/DWQ
1633 Mail Service Center
Raleigh, NC 27699-1633
8
EA