NC0025011_Authorization to Construct_19950724

Department of Environment, 5?'iIl
State of North Carolina
rt Health and Natural Resources A4
Division of Environmental Management
James B. Hunt, Jr_ Governor
Jonathan B. Howes, Secretary 1S%J F=1
A. Preston Howard, Jr., RE., Director
V
July 24, 1995
IME 2 5-
Nk. Victor D. Sharpe
Interim City Manager
City of Elizabeth City
P. O. Box 347'-=
Elizabeth City, North Carolina 27909-0347
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SUBJECT: City of Elizabeth City
Permit No. NCO025011
Authorization to Construct
Wastewater Treatment Facilities
SRF Project No. CS370546-04
SBF Project No. E-SBF-T-95-0016
Pasquotank County
Dear Mr. Sharpe:
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 4.5 MGD wastewater
treatment facility, designed for biological nutrient removal, at the site of the City of
Elizabeth City's existing 2.5 MGD trickling filter plant to consist of a new influent
structure containing a mechanical bar screen, manually-cleaned bypass bar screen,
aerated grit removal unit, and Parshall flume; nutrient removal/aeration basin sized for
13 hours total hydraulic detention time at design flow, divided into four (4) non-
aerated cells with submersible mixers and six (6) aeration cells with jet aerators and
mixed-liquor recirculation pumps; new blower building with four (4) 2,300 cfm
centrifiigal blowers; RAS/WAS pump station with sludge return capacity of 6.75
MGD; clarifier splitter box; two (2) 90-ft. diameter by 14-ft. SWI) secondary
clarifiers; new chlorine contact tank, modifications to existing chlorination system;
sulfur dioxide storage and feed facilities with injector and effluent mixer for
dechlorination, effluent weir box with ultrasonic flow meter and totalizer; effluent
reaeration tank with floating aerator; dual 24" gravity effluent outfhll pipes with
submerged diffusers, paralleling the existing 30" effluent outfall which will remain in
P.O.Box 29535,Raleigh,North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal opportunity Affirmative Action Employer 50%recycled/ 10%post-c onsumer paper

PAGE 2
service; polymer mixing equipment; gravity belt thickener; sludge (lime) stabilization
facilities and tank truck loading station; conversion of the existing digesters (2) and
primary clarifiers (2) to sludge storage tanks; clarifier scum pumps; pumps to
recirculate belt thickener filtrate and wastewater from drained tanks back to aeration
basin; non-potable water system and dual water reuse pumps for plant washdown and
lime slurry make-up water; new 2,900 SF operations/laboratory building; automatic
sampling equipment and instrumentation, including SCADA system for process
monitoring; on-site generator for standby power; and all associated site work, yard
piping, 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.
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. NC0025011, issued March 28, 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. NC0025011.
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.

PAGE 3
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. Bill
Hoffman, at [phone], extension 615.
Sincerely,
gestok-Wward, Jr., P.E.
Attachment
RPT:vk
cc: Piedmont, Olsen, Hensley
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• Washington Regional Office
Mr. Tom Fahnestock
Mr. Don Evans
Ms. Valerie Lancaster
Mr. Robert Teulings
Ms. Kim Brantley
DMJ
SRF
SBF