20070017 Burnstead PRD- Plan memo.DOC
MEMORANDUM
Date:March 26, 2007
To:Karen Stewart, Reid Middleton
From:Jeanie McConnell, Engineering Technician
Subject:Burnstead PRD – Prelim, Completeness Review – pln20070018
The subject application has been reviewed and is found to be incomplete. Additional
information is required to determine if the concept of the proposed drainage system is
acceptable.
Please respond to the following comments from Blaine Chesterfield, Stormwater Program
Manager. Blaine can be reached at 425-771-0220, ext. 1322 should you have specific
questions regarding these comments.
1.Provide additional information with regards to the proposed point drains. Please note
the sizing of the point drains, how will they be constructed and maintained, etc.
2.Page 3 of the drainage report states “the soils onsite were visibly sandy, so the water is
assumed to infiltrate”. Is there data to back this up or is this determination truly based
on assumption?
3.With regards to the existing infiltration facility, Page 3 of the drainage report also
states “this infiltration facilty has historically had problems with ponding”. Please state
why there is a historical problem. Was the design inadequate? Was there a lack of
maintenance on the system? Are the soils poor?
4.The proposed drainage system should have an emergency overflow. Indicate the
proposed location of the emergency overflow and it’s point of release on the plans.
5.Please provide a conceptual maintenance plan for the proposed drainage system.
City of Edmonds