NC0025879_Authorization to Construct_20150115

NPDES DOCUMENT SCANNIN` COVER MEET
NPDES Permit:
NC0025879
Robbinsville WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct'.
(AtC)
Permit Modification
Complete File - Historical
Report
Speculative Limits
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
January 15, 2015
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JP06
Town of Robbinsville
Robbinsville Wastewater Treatment Plant
Wastewater Treatment Plant Relocation
A To C No. No. 025879A02
Issued February 28, 2012
Engineer's Certification
I, i) a v cic Lyyr. 1-�' , as a duly registered Professional Engineer in
the State of North Carolina, hdving been authorized to observe (periodically/ )
the construction of the modifications and improvements to the Robbinsville WWTP, located at
the corner of OId Hwy 129 and Knight Street, Robbinsville in Graham County for the Town of
Robbinsville, hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the following construction:
Construction of anew dual -train 0.63 MGD wastewater treatmentplant, with each train
consisting of a 85,000 gallon flow equalization zone with dual 2,7 Hp submersible mixers
and dual 550 gpm pumps, two (2)) 6 3..6 gallon anaerobic zone with each zone having a
3 Hp submerged mixer, a)'fl,500 gallon pre -anoxic zone with dual 3 Hp submerged
mixers, a 2.6%400 gallon aeration zone with coarse bubble diffusers, dual 1,312 gpm
internal recycle (NRCY) pumps, a 53,125 gallon post -anoxic zone with a 3 Hp
submerged mixer, a 4,430 gallon re -aeration zone, a 37-foot diameter clarifier, an airlift
WAS pumping system, a 93,000 gallon sludge digester/storage tank with coarse bubble
diffusers and decanter; three (3) 327 gpm RAS pumps; three (3) 1,625 scfm blowers
(2) automatic backwash disc filter units; backwash pumpgati}ticonsisting of dual
gpm pumps; a dual bank UV disinfection system with each bank rated for 1.58 MG
ultrasonic flow meter; I6-inch ravity outfall to new outfall in Cheoah River; a
laboratory/office building; kW standby generator; and associated air and yard
piping, electrical control systems, in conformity with the project plans,
spe ati , and other supporting data subsequently filed and approved by the
____ D'epartment of Environment and Natural Resources.
r 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. () 3 y 999
Date VI SAS.
Mail this Certification to: Attn: Joseph Gyamfi, P.E.
Tnfrastructure Finance Section
DENR/D WQ
1633 Mail Service Center
Raleigh,, NC 27699-1633
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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman
Governor Director Secretary
February 28, 2012
The Honorable Bobby Smith, Mayor Pro-Tem
Town of Robbinsville
P. O. Box 129
Robbinsville, North Carolina 28771
SUBJECT: Authorization to Construct
A to C No. 025879A02
Town of Robbinsville
Robbinsville WWTP Relocation
Graham County
Dear Mayor Smith:
•
A letter of request for an Authorization to Construct was received October 4, 2011, 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 0.63 MGD Wastewater Treatment Plant, with
discharge of treated wastewater into the Cheoah River in the Little Tennessee River Basin.
This authorization results in no increase in design or permitted capacity and is awarded
for the construction of the following specific modifications:
Construction of a new dual -train 0.63 MGD wastewater treatment plant, with each train
consisting of a 85,000 gallon flow equalization zone with dual 2.7 Hp submersible mixers
and dual 550 gpm pumps, two (2) 26,560}gallon anaerobic zone with each zone having a
3 Hp submerged mixer, a 80,500 gallon pre -anoxic zone with dual 3 Hp submerged
mixers, a 244,250 gallon aeration zone with coarse bubble diffusers, dual 1,312 gpm
internal recycle (NRCY) pumps, a 53,125 gallon post -anoxic zone with a 3 Hp
submerged mixer, a 4,430 gallon re -aeration zone, a 37-foot diameter clarifier, an airlift
WAS pumping system, a 93,000 gallon sludge digester/storage tank with coarse bubble
diffusers and decanter; three (3) 327 gpm RAS pumps; three (3) 1,625 scfm blowers; two
(2) automatic backwash disc filter units; backwash pump station consisting of dual 350
gpm pumps; a dual bank UV disinfection system with each bank rated for 1.58 MGD;
ultrasonic flow meter; 16-inch gravity outfall to new outfall in Cheoah River; a
laboratory/office building; a 600 kW standby generator; and associated air and yard
piping, electrical work and control systems, in conformity with the project plans,
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: www.ncwaterqualitv.org
An Equal Opportunity \ Afrmative Action Employer
North Carolina
Naturally

The Honorable Bobby Smith, Mayor
February 28, 2012
Page 2
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. NC0025879 issued December 2, 2011, and shall be subject to revocation
unless the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0025879. •
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,

The Honorable Bobby Smith, Mayor
February 28, 2012
Page 3
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.
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,
di Charles Wakild, P.E.
jg:sr
cc: David Honeycutt, P.E, McGill Associates, 55 Broad Street, Asheville, NC 28801
Graham County Health Department
DWQ Asheville Regional Office, Surface Water Protection
DWQ, Technical Assistance and Certification Unit
DWQ, Point Source Branch, NPDES Program
Joe Gyamfi, P.E.
AtoC File 025879A02