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Craig
Chaney to"' " AN SI ..
Architect
September 30, 2015
Jennifer Lambert, Engineering Division
City of Edmonds Public Work Department
1215 1h Avenue N.
Edmonds, WA 98020
Re: BLD20150239 — Engineering Plan Review Comments 1 -Revised Scheme
Kemper Residence
9303 Olympic View Drive
Dear Ms. Lambert,
As I indicated to you in an earlier phone call the Kempers have engaged the services of Insight
Engineering to address the drainage issues and complete the civil design for their Residence. The
owner decided to abandon the concept of pervious paving and has increased the impervious
area to above 5000 sf, changing the site classification to a Small Site, Category 2, to give them
the greatest amount of flexibility with paving material selection for aesthetic reasons. The Civil
drawings reflect this change, and show a system designed to provide storm water management
for the 5700 sf of impervious area utilizing the existing 5000 sf of storm water capacity
dedicated to the site and on-site storm water management for the balance. Per our discussion
we are returning these drawings to you ahead of the building review, so that we can get the
reviews back in sync with each other.
Also, please note that the planning comments have been incorporated into the revised site
drawings.
GENERAL:
The site drawings have been revised and configured to address the issues raised in your initial
comment letter. All site drawings but the plot plan are now part of the civil drawing set, Pages
C1 and C2. The issues addressed in your letter should be addressed as indicated in the previous
response letter, and specifically for a few points, as indicated below.
STORM:
1) The footing drains that can provide a minimum of 1% slope to the invert elevation will
discharge to the stormwater detention system. Footing drains below the minimum slope will
drain to the sump and lift station, to be discharged to the stormwater system.
8314 NE 120th Street, Kirkland, WA 98034 . 425.802.5331
2) The retaining wall footings below the stormwater invert and footing drains that cannot
make the invert with a 1% slope will drain to a sump and lift station. See C1, A1.1 and detail
3/A1.1.
3) The owner intends to utilize the existing detention system plus a supplemental system
as indicated on the civil drawings.
a.) We've asked Insight Engineering to inspect the existing system to verify the
working condition of the existing detention system. We request that the system verification
report be made a requirement of permit issuance, or of CO, so that the plan review can continue
while the investigation is underway.
Hopefully the civil design and these revisions will bring the project into conformance with the
City's applicable codes. If you have any questions please don't hesitate to contact me.
Best Regards,
a��,(t�
Craig S. Chaney