NC0024945_authorization to construct_19930611

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Govemor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
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June 11, 1993
Mr. Henry L. Forrest
Charlotte -Mecklenburg Utility Department
5100 Brookshire Boulevard
Charlotte, NC 28216
Subject Permit No. ACA024945
Authorization to Construct
Irwin Creek WWTP-Imp.
Mecklenburg County
Dear Mr. Forrest
A letter of request for an Authorization to Construct was received January 19, 1993 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 improvements to Irwin Creek consisting of the
addition of three new mechanical bar screens, two new forced vortex type grit removal basins and two
parshall flumes for further grit removal and flow measurement, lime addition with all needed equipment
for alkalinity control, two similar additional basins for the activated sludge aeration section with two new
4300 scfm capacity centrifugal blowers, ten declining rate effluent filters, disinfection using sodium
bisulfate and cascade aeration with other changes to the influent pump station and other minor piping
changes with all the necessary piping and appurtenances with discharge of treated wastewater into Irwin
Creek in the Catawba River Basin.
This Authorization to Construct is issued in accordance with Part III, Paragraph C of NPDES
Permit No. NC0024945 issued September 16 1991, and shall be subject to revocation unless the
wastewater treatment facilities are constructed in accordance with the conditions and limitations specified in
Permit No. NC0024945.
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 Perrnittee 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 Mooresville Regional Office, telephone number 704-663-1699, 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.
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. NC0024945
Authorization to Construct
City of Charlotte
June 11, 1993
Page 2
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. Once the facility is classified, the Permittee must
submit a letter to the Certification Commission which designates the operator in responsible charge within
thirty days after the wastewater treatment facilities are 50% complete.
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 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 Randy Kepler, telephone number 919/733-5083.
s.. -ly,
reston ward, Jr., P.E.
cc: Mecklenburg County Health Department
Mooresville Regional Office, Water Quality
Training and Certification Unit
Gannett Fleming