20150522085949363.pdfApril 30, 2015
Ms. JoAnne Zulau
City ofEdmonds
121 6mAvenue North
Edmonds, VVA9802U
Project: Edmonds SDWestgate Elementary Portables, Our File No. 2150007.13
Subject: Response to Comments dated April 23, 2015, Plan Check No. BLD20150376
Dear Ms. Zulauf:
This letter is in dated April 23,8O15. regarding the above
referenced project. The comments are included below(verbatim)for your reference. Our
responses are shown inbold after each comment.
The prescriptive sizing chart located in the CDEHandout E72Ashows that 33'of24"
pipe is necessary for 3000 sf of impervious runoff. Please revise sizing on plans,
Response: The project will create 3,167 sf of impervious surface. 24 If of 30 -inch
diameter pipe is shown on the plan. Per the prescriptive sizing chart in COE
Handout E72 A, this length and diameter of pipe meets the requirements for up to
3,500 sf of impervious surface.
2. The new connection bshown auaSTC879O. Will hbeable hoaccommodate three 8^
pipes entering a1the same elevation ontwo sides. Aoageneral rule the pipes should
have aminimum ofG"between the outside diameter ofthe adjacent pipe. Knockout for
an8'diameter pipe iagenerally b t12^indiameher. Please show that these
separations can be attained or indicate that the catch basin will be replaced.
Kyou have any questions, please call mea1(20G) 267-2425.
Si
/~~ —__— Grignon, P.E.
Project Manger
Doug Tapp, AHBL
Steve Zang, Bassetti Architects
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