WQ0044006_Variance Request Approval_20230111

DocuSign Envelope ID:13ABE311-9COD-4A8B-9E6D-62FE9C1D3EF6 •
ROY COOPER P�t &SqI�"'- 50
Governor 'I' lob.
ELIZABETH S.BISER `A , '" `
Secretary 2�+5"tu+
RICHARD E.ROGERS,JR. NORTH CAROLINA
Director Environmental Quality
January 11, 2023
Carel Vandermeyden, P.E., Deputy Executive Director
Cape Fear Public Utility Authority
235 Government Center Drive
Wilmington, NC 28403
Subject: Variance Request Approval
Cape Fear Public Utility Authority
Rehabilitation & Replacement of Gravity Sewer in Downtown Wilmington Area
(WQ0044006)
New Hanover County
Dear Mr.Vandermeyden:
The Division of Water Resources (Division) has reviewed the submitted variance request
received on November 2, 2022 for the subject project. The Division will grant the variance
request for the use of three interference boxes, as indicated on the provided plans; subject to
the following requirements in accordance with the provisions for alternative design under 15A
NCAC 02T.0105(n):
1. Pursuant to the variance request received from WK Dickson &Co., Inc on behalf of Cape
Fear Public Utility Authority, a variance is granted for the operation of approximately 5
linear feet of 8-inch gravity sewer with 16-inch steel encasement pipe within an
interference box at STA 0+23 on South 5th Avenue, 8 linear feet of 8-inch gravity sewer
with 16-inch steel encasement pipe within an interference box at STA 4+61 on South 5th
Avenue and 7 linear feet of 8-inch gravity sewer with 16-inch steel encasement pipe
within an interference box at STA 0+19 on Dock Street.
2. Gravity sewer lines suspended through conflict/interference boxes to resolve
intersections with storm drains shall be constructed of ductile iron pipe with mechanical
joints, utilizing the materials,testing methods,and acceptability standards meeting water
main standards, in accordance with 15A NCAC 02T.0305(g). These lines shall be
designated as high-priority sewers,subject to the conditions as outlined below:
a. The section of gravity sewer as described above shall be designated as "high-
priority sewer" in accordance with 15A NCAC 02T.0402.
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DocuSign Envelope ID:13ABE311-9COD-4A8B-9E6D-62FE9C1D3EF6
b. High-priority sewers shall be inspected by the permittee or its representative at
least once every six-months in accordance with the permittee's individual
system-wide collection system permit(WQCS00012).
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.
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 Charlie Miller,P.E. at(919) 707-3627 or by email at
[e-mail].
Sincerely,
CDocuSigned by:
I,t.�c 4,,, IUa 41.e
C464531431644FE...
for Richard E. Rogers,Jr.
Director,Division of Water Resources
by Michael Montebello
NPDES Branch Chief, Division of Water Resources, DEQ
CC: Danial Khan, P.E., WK Dickson& Co., Inc. ([e-mail])
Wilmington Regional Office, Water Quality Regional Operations
Municipal Permitting Unit(electronic copy)
Nornvnml Quality I Division Water Resources
512 NorthtbCarolina Salisbury
Departme Streett I
of 1611En Environmental Mail entaService Center I Raleigh.of North Carolina 27699-1611
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DepErtcenl n1 Embomnmmtol(loon / 919.707.9000