bld20130598_thompson-rev1.docx
City of Edmonds
TH
121 5 AVENUE NORTH • EDMONDS, WA 98020 • (425) 771-0220 FAX(425) 771-0221
Website: www.ci.edmonds.wa.us
PUBLIC WORKS DEPARTMENT
Engineering Division
Plan Review Comments
Plan Check : Date:
# BLD20130598 Aug 26, 2014
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Project Name/Address:
Thompson New Single Family Residence 1024 9 Ave S
Contact Person/Address/Fax:
Marc Thompson marc@evertttirefactory.com
Reviewer: JoAnne ZulaufDivision:Engineering
During review of the subject submittal, it was found that the following information, corrections, or
clarifications would need to be addressed. All Handouts and Standard Details referred to in these
comments can be accessed at our website www.edmondswa.gov under “Permit Assistance”:
Stormwater Revision:
1. Plans show 4695 sf of impervious surface directed to the detention system. The revised
system has been designed using simplified sizing is for 4500 sf of impervious runoff.
Please revise detention design using the simplified sizing tools for 5000 sf or provide an
engineered system.
2. Add call out for each stretch of pipe; length, material, size.
3. Revise permeable pavement notes to be consistent with City of Edmonds requirements
found in handout E72 LID;
The pavement shall not receive stormwater run-on from other areas
Aggregate depth (for storage) must be at least 3 inches.
For sites with more than 5,000 sf of impervious area with subgrade slopes greater than 2 percent, the flow control
standard is not achieved. The mitigated area shall be calculated using the flow control credit (Table 4).
Aggregate shall be washed gravel with a minimum void volume of 20 percent.
Slope of the subgrade underlying the permeable pavement shall be less than 5 percent.
No underdrain or impermeable layer shall be used.
For subgrade slopes greater than 2 percent, higher flow control credit may be achieved if you design the system
with subsurface, low permeability check dams to ensure water storage along the sloping subbase.
4. Please show where the driveway trench drain connects to the detention system.
5. Add driveway slopes back to the drawing.
Please resubmit 3 copies of the revised plans/documents to a Development Services Coordinator. Please
contact me at 425-771-0220 if you have specific questions regarding these plan corrections.
DATE FAXED/E-MAILED 7/2/2017 PAGE ___ OF __
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