RESPONSE TO ENG COMMENTS 3.pdf10001IN I NOVERNON% Jamommumma
01101110
January 8, 2014
Jeanie McConnell, Engineering Program Manager
City of Edmonds, Engineering Division
121 5th Ave North, Second Floor
Edmonds, WA 98020
C&A Proj # 117-002-14
RE: Harter Residence ADU 9630 238111 St SW - Plan Check #BLD20140871
Response to 3rd Plan Review Comments
Dear Ms. McConnell:
This letter presents our response to the Engineering Division Plan Review Comments for the
subject project dated January 7th, 2015. The responses below correspond to each of the
comments in the January 7th letter.
ENGINEERING DIVISION COMMENTS
Thank you for relocating the infiltration system into a location with suitable soils. The
proposal includes 4 trenches side by side, each 2 -feet in width. City handout E72B - Low
Impact Development Stormwater BMP's states "One pipe per trench. If multiple trenches
are used, the spacing shall not be closer than 10 -feet, measured on center". According to
the City's stormwater engineer, more recent guidance would allow for trench spacing at
6 -foot on center. Alternatively, the infiltration system could be modeled by an engineer
as an 18'x8' facility to confirm that it meets standards. Please revise and resubmit plans
and documents accordingly.
Response: The trenches have been located with increased spacing - 6'0.C. spacing has
been provided peryour comment above.
We trust that our revisions addressed your comments. We have submitted revised plans for
your approval. If you have any questions regarding this response, please call me at (206) 484-
3495.
Regards,
Cecil & Associates, tes, LLC
Roger J. Cecil, P.E.