NC0020648_authorization to construct_19950209

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
February 9, 1995
Mr. Jerry Cutler
City of Washington
PO Box 1988
Washington, NC 27889
[DEHNR
Subject: Permit No. 4g x
Authorization to Construct
iaty,: Wat7
Wastewater Treatment Facility
ti eauf©t't"County
Dear Mr. Cutler:
A letter of request for an Authorization to Construct was received November 30, 1994 by the
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 a waste sludge pump station with dual
100 gpm pumps and force main at National Spinning WWTP with piping to the Washington WWTP.
At the existing Washington WWTP, authorization is hereby granted to convert an existing
anaerobic sludge digester to a sludge mixing tank with lime addition, construct a recirculation pump and
decant draw off box for National Spinning's sludge and construct a new sludge thickening lagoon pump
station with dual 100 gpm pumps to return supernatant to National Spinning's equalization basin.
Additionally, construct a 60,000 gallon mudwell with supernatant return lines to the splitter box at the head
of the Washington WWTP, install new lime slurry piping to sludge mixing tanks with line cleanouts, add
coarse bubble mixing to the existing sludge mixing tank and install approximately 2850 feet of 20 inch
outfall line across Kennedy Creek to the Tar River ending in a subaquaous diffuser and all related piping
and appurtenances.
The Washington WWTP is also hereby rerated and uthorized to discharge 3.2 MGD through the
continued operation of the existing influent metering vault, mechanical bar screen, automatic aerated grit
chamber, splitter box, aeration basin, activated sludge oxidation ditch, three secondary clarifiers with scum
removal and pumped sludge return, three tertiary deep -bed denitrification sand filters with methanol
storage/feed system, dual parallel chlorine contact chambers with flow paced gaseous chlorine feed, sulfur
dioxide dechlorination system, post aeration, lime storage tower and dual lime injection vaults, caustic
soda and polymer feed system, aerobic digester, four concrete sludge thickening lagoons, sludge
recirculation pump station and effluent pump station.
The facility is required to keep sludge from National Spinning and Washington WWTP separate at
all times. No mixing will occur in the sludge thickening lagoons or in the sludge mixing tanks of the two
sludges.
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

Permit No. NC0020648
Authorization to Construct
City of Washington
February 9, 1995
Page 2
No land disturbing activities will take place in Kennedy Creek or the Tar River between February
15 and May 30 of the year. Sedimentation and erosion control measures shall be designed and
implemented to protect streams from silt and soil deposition.
After completion of the new outfall line to the Tar River, the permittee shall place signs to inform
the public as to the location of the discharge line. Signs need to meet requirements of appropriate
regulatory agencies (NC Wildlife & US Coast Guard) and must be in place before discharge
commences.
This Authorization to Construct is issued in accordance with Part III, Paragraph C of NPDES
Permit No. NC0020648 issued November 2, 1993 and shall be subject to revocation unless the
wastewater treatment facilities are constructed in accordance with the conditions and limitations specified in
Permit No. NC0020648.
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 North Carolina Division of Environmental Management.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Perminee shall take immediate corrective action, including those as may be required by this
Division, such as the construction of additional or replacement wastewater treatment or disposal facilities.
The Washington Regional Office, telephone number 919/946-6481, shall be notified at least forty-
eight (48) hours in advance of operation of the installed facilities so that an in -place 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 the Permits and Engineering Unit, P.O. Box 29535, Raleigh, NC
27626-0535.
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 Title 15A, Chapter 8A, .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, and
must properly manage and document daily operation and maintenance of the facility and must comply with
all other conditions of Title 15A, Chapter 8A, .0202.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the
life of the facility.
Failure to abide by the requirements contained in this Authorization to Construct may subject the
Permittee to an enforcement action by the Division of Environmental Management in accordance with
North Carolina General statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct dncs rot preclude.
with any and all statutes f es regulations,hae or jurisdiction
uhich may be inposed by other govePerrnittee from rnment
agencies (local, state. �) which
a WWI

Permit No. NC0020648
Authorization to Construct
City of Washington
February 9, 1995
Page 3
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contact Charles Alvarez, telephone number 919/733-
5083.
Sincerely,
. restoard, Jr., P.E.
cc: Beaufort County Health Department
Washington Regional Office, Water Quality
Training and Certification Unit