NC0020761_AUTHORIZATION TO CONSTRUCT_19951222

KP®ES ®OCUWENT SCANNINS COVER SHEET
NPDES Permit: NC0020761
North Wilkesboro / Thurman St WWTP
Document Type: Permit Issuance
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Permit Modification
Engineering Alternatives Analysis
201 Facilities Plan
Instream Assessment (67B)
Correspondence re: draft permit
Permit History Date Range:
Document Date: mr ecea = 3 he�r2b2r199,=:
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content on the reverse side

State of North Carolina j
Department of Environment,
Health and Natural Resources 4C�
Division of Environmental Management _
James B. Hunt, Jr., Governor �®
Jonathan B. Howes, Secretary ® FE FZI
A. Preston Howard, Jr., P.E., Director
December 22, 1995
.n
Ms. Gail Harris, Acting Town Manager �=
Town of North Wilkesboro
P. O. BOX 218 ro wr'
North Wilkesboro, North Carolina 28659 :-
a
SUBJECT: Town of North Wilkesboro u'
;Permit No. NCO020761
Authorization to Construct
Wastewater Treatment Facilities
Project No. E-SBF-T-95-0022
Wilkes County
® Dear Ms: Harris:
The final plans and specifications for the subject project have been reviewed and
found to be satisfactory.
Authorization is hereby granted for the construction and operation of additions
and modifications to the existing wastewater treatment plant with an increase in
capacity to 2.0 MGD to include a new 900 ft., 24 in. parallel interceptor sewer and
appurtenances; a new mechanical bar screen and relocate the existing manual bypass
bar screen; a new grit collector; modification of the existing influent pump station by
the addition of a new 875 gpm, 15 Hp pump to provide a total pump station capacity
of 3.7 MGD; an influent flow meter and recorder; a new 918 ft rectangular primary
clarifier; a new 10 Hp air compressor for primary sludge air lift and primary sludge
pump air supply; conversion of the existing sludge digester to an aeration basin; eight
(8) new 25 Hp floating aerators, 4 in the existing aeration basin and 4 in the new
aeration basin; a new secondary clarifier splitter box; two (2) new 40 ft diameter
secondary clarifiers; expand the existing chlorination tank to provide for dual channels;
new chlorination and sodium bisulfite dechlorination equipment; new 10 Hp motors
and replacement of the impellers on the five (5) existing RAS/WAS pumps to provide
for a total pump capacity of 1400 gpm; a new sludge flow meter; a new scum pump
• station with a 7.5 Hp, 260 gpm pump and a spare pump stored on site; conversion of
the existing anaerobic digester to an aerobic digester and a new 280,000 gallon aerobic
P.O. Box 29535.Raleigh,North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50%recycled/ 10%post-consumer paper

PACE 2
digester with aeration provided by three (3) 1200 scfm blowers; conversion of the
' existing gas holder to 41,000 gallon aerated sludge thickening with aeration provided
by a 100 scfm blower and a standby blower stored on site; two (2) 5 Hp, 340 gpm
sludge transfer pumps; a new 1,000,000 gallon sludge storage tank with a 60 Hp
floating mixer; a sludge truck loading station with one (1) 7.5 Hp, 760 gpm pump
(standby scum pump will double as sludge standby pump); a new exterior insulated
acrylic finish for the existing operations building; modifications to the existing
chlorination/sludge pumping building to increase the wall height to accommodate a
monorail hoist for ton chlorine cylinders; and associated site and electrical work.
Do not proceed with construction until the Authorization-to-Award package,
EEO, and MBE documentation/certification have been reviewed, and you are in receipt
of our approval, if funding is desired for project construction.
Plans and specifications for the upgrade of the influent pump station to a capacity
of 5.0 MGD must be submitted to the Division of Environmental Management - Water
Quality Section when the average daily flow for any month, at the plant, reaches 1.35
MGD.
The Permittee shall employ an actively State certified wastewater treatment plant
operator to be in responsible charge of the wastewater treatment facilities. Such
® operator must hold a valid State Certificate of the grade at least equivalent to the
classification assigned to the wastewater treatment facilities by the Certification
Commission. When a new chief operator must be obtained to be in responsible charge
of the new facilities, it is required that this be done by the time the construction of the
facilities is 50% complete.
The Authorization-to-Construct is issued in accordance with Part III, Paragraph C
of NPDES Permit No. NC0020761, issued October 1, 1995 and shall be subject to
revocation unless the wastewater treatment facilities are constructed in accordance with
the approved plans, specifications, and supporting documents; and are in compliance
with the conditions and limitations specified in Permit No. NC0020761.
The Pemuttee shall have an acceptable sludge analysis and a sludge toxicity
analysis which have been approved by the Division of Environmental Management,
Water Quality Section prior to the disposal of any sludge from the new wastewater
treatment plant. Copies of the analyses, supporting documents, and approvals shall be
submitted to the Division of Environmental Management's Winston-Salem Regional
Office.
The disposing, selling or free distribution of wet, dried, composted sludge or
sludge-like materials from wastewater facilities without prior review and approval by
• this Division is illegal.

PAGE 3
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.
One (1) set of final approved plans and specifications is to be forwarded to you
for your files. The copy of the approved plans and specifications shall be maintained
on file by the Owner for the life of the project.
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 approved plans and
specifications. Mail the Certification to the Permits and Engineering Unit, P. O. Box
29535, Raleigh, North Carolina 27626-0535. (Engineer's Certification Form is
attached.)
® If you have any questions or need additional information, please contact Mr.
Allen Wahab at [phone].
Sincerely,
Prest Howard, Jr., P.E.
Attachment
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cc: Finkbeiner, Pettis & Strout, Inc.
Mr:Don Safrit7
Winston-Salem Regional Office
Mr. Tom Fahnestock
Mr. Don Evans
Ms. Valerie Lancaster
Mr. Bennie Goetze, Jr.
Ms. Kim Brantley
• DMU
SBF