WQCS00054_Approval_20190822

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Governor ' µ
MICHAEL S.REGAN
Secretary
LINDA CULPEPPER NORTH CAROLINA
Director Environmental Quality
August 22, 2019
John Shutak, CIP Program Manager
Union County Public Works
500 North Main Street,Suite 500
Monroe, NC 28112
Subject: Variance Request Approval
Poplin Road Pump Station and Equalization Tank
Union County Public Works—WQCS00054
Union County
Dear Mr.Shutak:
The Division of Water Resources (Division) has reviewed the submitted variance request received on
February 7,2019,with additional information received May 13,2019,for the subject project. The Division
will grant the variance request for the modified peaking factor for the Poplin Road Pump Station, in
accordance with the provisions for alternative design under 15A NCAC 02T.0105(n):
1. Pursuant to the variance request received February 7, 2019,with additional information
received May 13, 2019,the permitting of flows through the Poplin Road Pump Station may
utilize a peaking factor of 1.64 for the purposes of the Flow Tracking for Sewer Extensions(FTSE)
form due to the available redundancy for wet weather flows provided by the proposed future
equalization basin to be located at the pump station, per the provided plans, calculations, and
supplementary documentation.This approval is subject to the following conditions:
a. The approved modified design peaking factor may not be utilized for the purposes of
calculating FTSE flows through the Poplin Road Pump Station until the proposed
equalization basin is permitted, constructed,operational,and the Engineer's
Certification has been received by the Division. [15A NCAC 02T.0116]
b. The dry-weather average daily and peak flows shall be assessed annually to verify the
design peaking factor approved above, as well as ensure that the dry-weather peak
flows remain less than or equal to the firm capacity of the pump station (3.64 MGD).
This analysis shall also include documentation verifying that the equalization basin is
effectively mitigating wet weather flows.The annual data verification for each calendar
year shall be submitted to the Division's Central Office staff no later than June 30th of
the following year.Should the data demonstrate that the above reduced peaking factor
is no longer appropriate,this variance approval shall be reevaluated.
Regardless of the variance approval, in the event that the wastewater collection 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 this Division, such as the construction of
additional or replacement facilities.
DE Q� North Carolina Department of Environmental Quality I Division of Water Resources
vv 512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
NORTH CAROLINA
o.o.b.in s ...etal o.w+ ird 919.707.9000

Union County Public Works—WQCS00054
August 22,2019
All other elements of this project shall be constructed in accordance with all applicable rules and statues
including, 15A NCAC 2T;the Division of Water Resources' (Division) Gravity Sewer Minimum Design
Criteria adopted February 12, 1996 as applicable; and the Division's Minimum Design Criteria for the
Fast-Track Permitting of Pump Stations and Force Mains adopted June 1, 2000 as applicable. Approval
of the variance request does not constitute approval of the permit.
If you have any questions, please contact Christyn Fertenbaugh, P.E. at 919-707-3625 or via email at
[e-mail].
Sincerely,
JAfest--
for Linda Culpepper
Director, Division of Water Resources
by Deborah Gore, PERCS Supervisor
Division of Water Resources, NCDEQ
cc: Keller Schnier, P.E., Brown and Caldwell ([e-mail])
Mooresville Regional Office, Water Quality Section Regional Operations(electronic)
Water Quality Central Files—WQCS00054
PERCS Files(electronic copy)