20070717113410.pdfCITY OF EDMONDS
121 5TH AVENUE NORTH • EDMONDS, WA 98020 • (425) 771-0220 • FAX (425) 771-0221
Website: www.d.edmonds.wa.us
DEVELOPMENT SERVICES DEPARTMENT
Planning • Building • Engineering
July 17, 2007
Travis J. Falk, Project Manager
Wilcox Construction, Inc.
234 5th Avenue South
Edmonds, Washington 98020
GARY HAAKENSON
MAYOR
RE: Bank of Washington @ 202 5`h Avenue South, Edmonds
Request for Alternate Design to Reduce Grade of Horizontal Drainage Piping
Dear Mr. Falk,
The City is in receipt of your request (dated July 13, 2007) to reduce the slope in fall for
sanitary sewer from 2% to 1.5% for approximately 60 feet of drainage line.
The specific governing code provision (2003 Uniform Plumbing Code Section 708.0)
requires a uniform slope of not less than 2% unless where it is impractical due to the
depth of the street sewer, structural features or the arrangement of any building/structure
a slope of not less than 118" of an inch per foot or one percent may be approved by the
Administrative Authority.
Based on the site constraints and pipe location/information provided in your letter the
request for below grade waste lines is hereby Approved with the condition that the
building waste line be a minimum of 4 inches to maintain adequate flow.
Sincerely,
Jeannine L. Graf, C.B.O.
Building Official
Cc: Bank of Washington
Street Address File
• Incorporated August 11, 1890 •
Sister City - Hekinan, Japan
WILCOX CONSTRUCTIONINC.
234 5th Avenue South • Edmonds, WA 98020
Phone (425] 774-4165 • FAX [425] 774-4187
July 13, 2007
The C1% of Edmonds
121 — 5 n Avenue North
Edmonds, Washington 98020
Re: Reduction in fall for sanitary sewer from 2% to 1.5%
Dear Plumbing Engineer,
I am writing this letter to request a variance to the standard 2% slope of the plumbing waste line
(sanitary sewer) requirement. Due to a conflict in the elevation of the existing 6" sewer stub and
the recently installed storm line, there is insufficient elevation to maintain 2% fall in the 3" building
waste line. The new sanitary sewer line has been installed in accordance with the
permit/construction documents and has the standard/required 2% slope to the point of connection
of the plumbing waste line to sanitary sewer connection. The storm was installed per the
permit/construction documents and has been inspected, approved and backfilled. Upon potholing
the existing 6" sewer, it was found to be located perpendicular to and within 5' of the newly placed
storm line. To maintain fall of the 6" sewer and to clear the 8" storm, the new sewer line needed
to be routed over the top of storm pipe (the newly installed section of sewer line has been
inspected and covered as well). This loss of elevation raised the sewer tie in at the
building, resulting in a lack of elevation to obtain the necessary fall in the proposed building waste
line. It will be necessary to reduce the slope from 2% to 1.5%.
We are prepared to increase the size of the building waste line from 3" to 4" if deemed necessary
to maintain adequate flow.
Thank you for your consideration in this matter,
Sincerely,
Travis J. Falk
Project Manager
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