NC0085359_Revised Residential Flow Reduction Approval_20180126

Water Resources
ENVIRONMENTAL DUALITY
January 26, 2018
Crystal 0. Panico, P.E., New Development Program Manager
Union County Public Works
500 N. Main Street, Suite #500
Monroe, NC 28112
Subject: Twelve Mile (NC0085359) & Crooked Creek WWTP (NC0069841)
Revised Residential Flow Reduction Approval
Union County
Dear Ms. Panico:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
On December 4, 2017, the Division of Water Resources (Division) received a revision request for the
previously approved adjusted daily sewage flow rate (flow reduction) that would apply to all permitted
but not yet tributary residential connections and all future residential connections within the Twelve
Mile WWTP and Crooked Creek WWTP service areas.
In accordance with 15A NCAC 02T .0114(f)(2), the Division has evaluated the revision request and based
on the data submitted and the Division of Water and Infrastructure (DWI) guidance, the Division hereby
approves for use by Union County Public Works a revised adjusted daily sewage design flow rate with
the following conditions:
• The flow reduction is applicable to residential single family dwellings only.
• The minimum flow for 1 and 2 bedroom dwellings shall be 190 gallons per day.
• Each additional bedroom above two bedrooms shall increase the volume by 95 gallons per day
per bedroom.
• This flow reduction shall not apply to sewer extension applications and/or permits for any other
public or private organizations whose wastewater flows are or might become tributary to the
Union County collection system (WQCS00054).
• For permitting purposes, allocations may be permitted utilizing a flow of 285 gallons per day
per lot. The number of total bedrooms shall be stated in the permit based on the indicated
average of 3 -bedrooms per lot, and a modification to the permit shall be completed prior to
construction of additional bedrooms above the specified total.
o The number of bedrooms installed shall be tracked by Union County Public Works. The
current total of bedrooms installed shall be submitted with each engineering
certification (partial or final) and with any permit modification application packages.
Future sewer extension applications should be made using the flow reduction amount stated above. All
other aspects of the permitting process remain unchanged, and all applications must be in compliance
with the statues, rules, regulations and minimum design criteria as certified by the owner and engineer.
-^Nothing Comparesr--.,.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

Union County
NCO085359 & NCO069841
Regardless of the adiusted design daily wastewater flow rate, at no time shall the wastewater flows
exceed the effluent limits defined in the NPDES Permit for the treatment facility or exceed the capacity
of the sewers downstream of any new sewer extension or service connection(s).
The granting of this flow reduction does not prohibit the Division from reopening, revoking, reissuing
and/or modifying the flow reduction as allowed by the laws, rules, and regulations contained in 15A
NCAC 02T, NCGS 143-215.1, or as needed to address changes in State and/or Federal regulations with
respect to wastewater collection systems, protection of surface waters and/or wastewater treatment.
If you have any questions, please contact Christyn Fertenbaugh, P.E., at [phone], or via email at
[e-mail].
Sincerely, y
for Linda Culpepper
Interim Director, Division of Water Resources
by Deborah Gore, Supervisor
Pretreatment, Emergency Response and Collection Systems Branch
Cc: Mooresville Regional Office, Water Quality Regional Operations
Twelve Mile (NC0085359) and Crooked Creek (NC0069841)
PERCS (electronic copy)
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