bld20140415_Stormwater # 1.pdfZulauf, JoAnne
From: Zulauf, JoAnne
Sent: Monday, June 09, 2014 2:54 PM
To: Bryan Krannitz (Bryan@krannitzgehl.com)
Subject: Jacobsen blc120140415
Bryan,
These are the comments from our Stormwater Engineer, Jerry Shuster.
For this permit application I reviewed the following:
• Drainage Report for Jacobsen Redevelopment, SFR, Donna Breske, PE, 4/17/2014
• Plan sheet C1.
Drainage Report
1. Page 5, Downstream Analysis— Note that the stormwater system on Hanna Park Road is a privately owned and
maintained system. Permission may be needed from the other owners of the road to connect to this system. At
minimum, a conveyance check for the 100 year un -detained flow plus the existing flows should be included to
check this system's capacity. The City's Geographic Information System map indicates this private system on
Hanna Park Road connects to City catch basin number 8-156 (http://maps.edmondswa.gov/Default.htm). The
outlet to this catch basin is a 6 inch diameter pipe. A conveyance check should be done % mile downstream of
the connection to the City system.
2. Page 6, Small Site Minimum Requirement 5: On -Site Stormwater Management and Impervious Area Exhibit —
The text and the exhibit discuss the use of "Flow Dispersion" for two sections of patio and the "pond overflow."
The plans do not indicate a designed flow dispersal system per the Ecology's 2005 Stormwater Management
Manual for Western Washington (SWMMWW). Their location is unclear. In addition, the "Drainage Control"
section of the geotechnical report for project (Geospectum Consultants, Inc., December 2013, page 11)
recommends "Roof drains ... and out buildings should be tightlined into the storm drains system (no discharge to
the ground) or to a non-erosive discharge point below the bluff slope."
3. Page 6, Small Site Minimum Requirement 7: Flow Control —The WWHM modeling should use the "Puget East
36" precipitation file per Section 5.7.3.1of the Edmonds Stormwater Code Supplement.
4. Appendix B - The soil management exhibit needs a legend for the various letters.
Plan Sheet C1
5. Detention System Section -The City has anew detail for detention control structures that does not use a shear
gate. See:
http://www.edmondswa.gov/images/COE/Services/Permits and Development/Standard Details/Storm Draina
ge/E5-4 FLOW CONTROL STRUCTURE.pdf
Jerry Shuster, P.E.
Stormwater Engineering Program Manager
Jerry. ShusterPedmondswa.gov
425-771-0220 x1323
Please contact him with any questions you may have.
Thank you.
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Joanne.Zulauf@edmondswa.gov