NC0046728_Authorization to Construct_20100324

NPDES DOCUMENT SCANNING1 COVER SWEET
NPDES Permit:
NC0046728
Mooresville / Rocky River WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct
(AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Approval
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Permit
History
Document Date:
March 24, 2010
Thies document is printed on reuse paper - ignore airy
content on the reYeriae side

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
March 24, 2010
Mr. John C. Vest, P.E.
Town of Mooresville
P.O. Box 878
Mooresville, North Carolina 28115
SUBJECT: Authorization to Construct U� '
A to C No. 024945A02 ?
Town of Mooresville
Rocky River WWTP Improvements
Project No.CS370409-04
Dear Mr. Vest:
A letter of request for an Authorization to Construct was received September 29, 2009,
by the Division of Water Quality (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 modifications to the existing 5.2 MGD Wastewater Treatment Plant, with
discharge of treated wastewater into Dye Creek in the Yadkin -Pee Dee River Basin.
This authorization results in an increase in design and permitted capacity to 5.5 MGD,
and is awarded for the construction of the following specific modifications:
Installation of 2 MGD package wastewater treatment system, as an interim
expansion to the 5.2 MGD existing WWTP, consisting of a spiral -type fine screen
with 1/4-inch fine openings rated at 5 MGD peak flow, two (2) 0.8 MG gallons
each aeration tanks with fine bubble disk -type diffusers, two (2) 58-ft diameter
clarifiers each with 15-ft side water depth, three (3) 2,300 SCFM blowers, and
three (3) 700 gpm constant speed RAS pumps; modification of the existing
influent pump station consisting of the addition of three (3) 1,740 gpm pumps
with VFDs; three (3) 4,511 gpm secondary effluent pumps; cascade aerator;
effluent filter system consisting of filter influent box and four cloth -media filters
each rated for peak flow of 6 MGD; a UV disinfection system consisting of two
banks each rated for a peak flow of 18 MGD; a 750 kW standby generator; and
associated yard piping and appurtenances, electrical work and control systems to
provide a complete treatment system, in conformity with the project plans,
specifications, and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet www.ncwatenquatity.org
An Equal Opportunity 1 Affirmative Action Employer
NoniethCarolina
atura!!y

Mr. John C. Vest, P.E.
March 24, 2010
Page 2
This Authorization to Construct is issued in accordance with Part III, Paragraph A of
NPDES Permit No. NC0024945 issued September 21, 2009, 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 Division.
In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action, including those as may
be required by the Division, such as the construction of additional or replacement wastewater
treatment or disposal facilities.
The Mooresville Regional Office, telephone number [phone], shall be notified at
least forty-eight (48) hours in advance of operation of the installed facilities so that an on site
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: Construction Grants & Loans,
DWQ/DENR, 1633 Mail Service Center, Raleigh, NC 27699-1633.
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 T15A:8G.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, must properly manage the facility, must document daily operation and
maintenance of the facility, and must comply with all other conditions of T15A:8G.0202.
A copy of the approved plans and specifications shall be maintained on file by the
Permittee for the life of the facility.
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,

Mr. John C. Vest, P.E.
March 24, 2010
Page 3
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.
Prior to entering into any contract(s) for construction, the recipient must have obtained all
applicable permits from the State.
Failure to abide by the requirements contained in this Authorization to Construct may
subject the Permittee to an enforcement action by the Division 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 Seth Robertson, P.E. at telephone
number [phone].
Sincerely,
Coleen H. Sullins
st:sr
cc: James M. Nagel, P.E. — CH2M Hill, 11301 Carmel Commons Blvd., Suite 304
Charlotte, NC 28226
Iredell County Health Department
DWQ Mooresville Regional Office, Surface Water Protection
Technical Assistance and Certification Unit
Point Source Branch, NPDES Program
Steve Tsadwa
SRF File

Town of Mooresville
A To C No. 024945A02
Project No. CS370409-04
March 24, 2010
Engineer's Certification
I, , as a duly registered Professional Engineer in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time)
the construction of the modifications and improvements to the Rocky River WWTP, located on
Johnson Dairy Road in Iredell County for the Town of Mooresville, hereby state that, to the best
of my abilities, due care and diligence was used in the observation of the following construction:
Installation of 2 MGD package wastewater treatment system, as an interim
expansion to the 5.2 MGD existing WWTP, consisting of a spiral -type fine screen
with 1/4-inch fine openings rated at 5 MGD peak flow, two (2) 0.8 MG gallons
each aeration tanks with fine bubble disk -type diffusers, two (2) 58-ft diameter
clarifiers each with 15-ft side water depth, three (3) 2,300 SCFM blowers, and
three (3) 700 gpm constant speed RAS pumps; modification of the existing
influent pump station consisting of the addition of three (3) 1,740 gpm pumps
with VFDs; three (3) 4,511 gpm secondary effluent pumps; cascade aerator;
effluent filter system consisting of filter influent box and four cloth -media filters
each rated for peak flow of 6 MGD; a UV disinfection system consisting of two
banks each rated for a peak flow of 18 MGD; a 750 kW standby generator; and
associated yard piping and appurtenances, electrical work and control systems to
provide a complete treatment system, in conformity with the project plans,
specifications, and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources.
I certify that the construction of the above referenced project was observed to be built within
substantial compliance and intent of the approved plans and specifications.
We understand that the new limits associated with the modifications to expand to 5.5 MGD now
apply.
Signature Registration No.
Date
Send to: Construction Grants & Loans %' �,
DENR/DWQ
1633 Mail Service Center i '` E- ft 1
Raleigh, NC 27699-1633 '1