NC0020443_AUTHORIZATION to CONSTRUCT_19940527

l 'S
State of North Carolina
Department of Environment,
Health and Natural Resources A • •
Division of Environmental Management
James B. Hunt, Jr., r ry Am2m® E H N F 1
Jonathan B. Howes,, Secretary
A. Preston Howard, Jr., P.E., Director
May 27, 1994
Mr. William C.,Harrell, Town Manager
Town of Columbia
P. O. Box 361
Columbia, North Carolina 27925
SUBJECT: Town of Columbia
Permit No. NCO020443
Authorization to Construct
Wastewater Treatment Facilities
Project No. CS370501-02
Tyrrell County
Dear Mr. Harrell:
The final plans and specifications for the subject project have been reviewed
and found to be satisfactory. .
Authorization is hereby granted for the construction of a new wastewater
treatment facility to include an influent structure with a manual bar screen and grit
chamber; a 0.225 MGD oxidation ditch with dual 25 Hp rotors; dual 26-foot diameter
secondary clarifiers; dual 5 Hp RAS pumps with a capacity of 250 GPM, dual 10 Hp
effluent pumps with a capacity of 450 GPM, a 26-foot diameter aerobic digester with a
7'/z Hp floating mechanical aerator; a 44-foot diameter sludge holding tank with a 20
Hp dual speed floating mechanical aerator; a chlorination building with a laboratory
and electrical room; relocation of existing standby generator to new treatment plant
site; modifications to the existing treatment facility to include conversion of the
existing chlorination facility to a dechlorination facility and installation of a new 1.5
Hp blower for post aeration; modifications to the existing influent pump station,
including replacing the existing dual 5 Hp influent pumps with new dual 5 Hp pumps,
450 GPM pumps; approximately 8,140 Lf. of 8-inch sewer force main between the
existing and new treatment facilities, all associated site work, electrical and
appurtenances at all sites.
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
r

- 2 -
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.
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. NC0020443, issued March 28, 1994 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. NC0020443.
The Permittee 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 Washington 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.
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
lica le, 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.

- 3 -
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. Bill Hoffman, at [phone], extension 615.
Sincerely,
4 Presto ard, Jr., P.E.
Attachment
GJ/nw
cc: McDavid Associates, Inc.
Mr. Don Safrit
Washington Regional Office
Mr. Tom Fahnestock
Mr. Don Evans _
Ms. Valerie Lancaster
y Mr. Gene Johnson
Ms. Cindy Finan
DMU
SRF
f
y