NC0081621_Authorization to Construct_20161219 (4)

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PAT MCCRORY
ilVai;er Resources
ENVIRONMENTAL QUALITY
December 19, 2016
Timothy R. Kiser, PE, Director of Engineering
Water and Sewer Authority of Cabarrus County
PO Box 428
Concord, North Carolina 28026
Dear Mr. Kiser:
DONALD R. VAN DER VAART
S . JAY ZIMMERMAN
SUBJECT: Authorization to Construct
A to C No. 081621A02
Water and Sewer Authority of
Cabarrus County
Muddy Creek V`TWTP
A letter of request for an Authorization to Construct was received September 6, 2016, by
the Division of Water Resources (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 0.15.MGD Muddy Creek WWTP, with discharge of
treated wastewater into the Rocky River in the Yadkin -Pee Dee River Basin.
This authorization results in an increase in design and permitted capacity to 0.30 MGD,
and is awarded for the construction of the following specific modifications:
Replace influent pumps with two (2) new 730 gpm submersible non clog pumps;
replace existing fine screening equipment with a new manual by pass screen and
a 30-inch diameter inclined drum screen with a 1.5 MGD hydraulic capacity;
install two (2) new 730 gpm equalization basin pumps in addition to the two (2)
existing; install an additional flow meter to monitor the flow out of the EQ basin;
modifications to the existing modular package treatment units to include removal
of sludge handling and surge basins and associated mechanical equipment to
expand the aeration volume into four (4) units creating a total capacity of
250,000 gallons with course bubble diffusers; replace the three (3) oldest blowers
with new 1,350 SCFM blowers; install two (2) forty -foot diameter secondary
clarifiers with 12-foot side water depth; install three (3) new 730 gpm RAS
pumps and new RAS and WAS flow meters; install a third cloth filtration unit
with a 400,000 gpd hydraulic capacity; convert four (4) 7,600 gallon secondary
clarifiers to sludge holding tanks for a total of 30,400 gallon capacity; install a
new pre-engineered chemical storage enclosure; replace UV treatment system
with a new 1,460 gpm UV treatment system; in conformity with the project
plans, specifications, and other supporting data subsequently filed and approved
by the Department of Environmental Quality.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail service Center I Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604, Archdale Building 9th Floor
Phone: [phone] / Fax: [phone]

Timothy R. Kiser, PE, Director of Engineering
December 19, 2016
Page 2 of 3
This Authorization to Construct is issued in accordance with Part III, Paragraph A of
NPDES Permit No. NC0081621 issued October 19 2014, and shall be subject to revocation unless
the wastewater treatment facilities are constructed in accordance with the conditions and
limitations specified in Permit No. NC0081621.
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: Division of Water Resources, WQ
Permitting Section — NPDES, 1617 Mail Service Center, Raleigh, NC 27699-1617.
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 T 15A: 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,
and in such a manner, as necessary to comply with the effluent limits specified in the NPDES
Permit.

Timothy R. Kiser, PE, Director of Engineering
December 19, 2016
Page 3 of 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.
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.
If you have any questions or need additional information, please contact Ron Berry at
telephone number [phone].
Sincerely,
e
S. Jay Zimmerman
Director, Division of Water Resources
Attachment: Engineer's Certification
cc: Charles A. Willis Jr., PE, BCEE,
Willis Engineers, 10700 Sikes Place, Suite 115, Charotte, NC 28277
DWR/Mooresville Regional Office, Water Quality Programs
Ron Berry
Michelle McKay, E.I.
Central Files
NPDES File