NC0021369_Authorization to Construct_20130225

NPDES DOCUMENT !;CANNINe COVER :SHEET
Permit:
NC0021369
Columbus WWTP
NPDES
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct
(AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
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Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 25, 2013
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175
ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P.E. John E. Skvarla, III
Governor Director Secretary
Mr. Jonathan Kanipe
Town of Columbus
Post Office Box 146
Columbus, North Carolina 28722
February 25, 2013
SUBJECT: Authorization to Construct
A to C No. 021369A04
Town of Columbus
Columbus WWTP Improvements
SRL Project No. E-SRL-T-11-0087
Dear Mr. Kanipe:
A letter' of request for an Authorization to Construct was received February 21, 2013, 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 0.8 MGD WWTP, with discharge of treated
wastewater into an unnamed tributary of the White Oak 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 0.8 MGD (2.0 MGD peak) automated bar screen with a manual
bypass bar screen; 0.8 MGD (2.0 MGD peak) grit removal system; a new
redundant 45-ft diameter clarifier with 14-ft side wall depth and a loading rate of
252 gpd/ft2; two (2) new 300 gpm RAS/WAS pumps and flow monitors; one (1)
new 233,000 gallon aerated sludge digester/holding tank with a 600 gpm sludge
transfer''pump; and a 600 KW backup generator, 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. NC0021369 issued August 29, 2012, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0021369.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: www.ncwateraualitv.orq
MAR 0 4 2013
DENR-WATER QUALITY
POINT SOURCE BRANCH
One
NorthCarolina
Naturally
An Equal Opportunity1 Affirmative Action Employer

Mr. Jonathan Kanipe
February 25, 2013
Page 2
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 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 Asheville 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: Infrastructure Finance Section,
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

Mr. Jonathan Kanipe
February 25, 2013
Page 3
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.
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].
-Charles Wakild, P.E.
MM:sr
cc: Bob Froneberger, P.E. - W K Dickson & Company, Inc.
Pollc County Health Department
DWQ Asheville Regional Office, Surface Water Protection
DWQ Point Source Branch, NPDES Program
Michelle McKay, E.I.
SRL File