REVIEWED PLN BLD2020-0865+GEO LETTER+9.14.2020_3.27.03_PMI>
September 4, 2020
Project No. 20190101EO01
Vector One, LLC
P.O. Box 13377
Everett, Washington 98206
Attention: Mr. Carl Clapp
Mr. Matt Bolin
a s s o c i a t e d
earth sciences
i n c o r p o r a t e d
Subject: Geotechnical Plan Review
8344 Olympic View Drive (Lot B)
Snohomish County Tax Parcel No. 27041800109300
Edmonds, Washington
Dear Mr. Clapp and Mr. Bolin:
RECEIVED
Sep 14 2020
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
BLD2020-0865
As requested, Associated Earth Sciences, Inc. (AESI) is pleased to provide this letter regarding
geotechnical plan review for the subject project. This review is based on recommendations
provided in the following documents previously prepared by AESI for the project:
• "Geotechnical Report Update, 83XX Olympic View Drive," dated March 19, 2019.
• "Soldier Pile Shoring Wall Design Recommendations, 83XX Olympic View Drive," dated
July 15, 2020.
The March 19, 2020 report was an update to a previous geotechnical report prepared by Liu
and Associates, Inc. (LAI) titled "Geotechnical Engineering Study, Proposed 3-Lot Short Plat,
8364 Olympic View Drive, Edmonds, Washington," prepared for Mr. Bill Ritter, dated
September 26, 2005. At the time of the 2005 LAI study, the project site consisted of a single
parcel with an existing home. The site was subsequently subdivided into three lots with the
existing home remaining on one of the new lots. Our March 2019 report update addressed
development of the remaining two lots (Lots A and B). At the time of our March 2019 study,
project plans for Lot A had been completed and a geotechnical plan review was completed for
Lot A as part of the updated report. In accordance with a request by the City of Edmonds, this
letter addresses our geotechnical review of project plans for Lot B
Kirkland I Tacoma I Mount Vernon
425-827-7701 1 www.aesgeo.com
We have completed our geotechnical review of the following plans prepared for Lot B:
• "Site Plan, Ritter SP - Lot B," prepared by Omega Engineering, Inc., dated July 1, 2020.
• Architectural plans consisting of Sheets T1.0, A1.0, A1.1, A2.0, A2.1, A3.0, A3.1, A3.2,
A4.0, A4.1, A6.0, A6.1, A6.2, and A6.3 prepared by Architectural Design Associates, PS,
dated June 15, 2020.
• Structural plans consisting of Sheets S1.0, S1.1, and S1.2, prepared by Mitchell
Engineering, dated June 15, 2020.
In our opinion, the plans reviewed reflect the recommendations presented in our above -
referenced geotechnical report update. It should be noted that the original geotechnical report
by LAI recommended use of a catchment wall upslope of the proposed homes to mitigate
landslide hazards associated with the portion of the slope above the homes. The topography
on Lot A is significantly steeper than the topography on Lot B. Slope inclinations on the portion
of the slope above the location of the proposed home on Lot B range from approximately 24 to
27 percent. Given the moderate topography in this area, as well as the subsurface conditions at
the site, it is our opinion that risk of landsliding is low and the catchment wall may be omitted
for Lot B.
If you have any questions regarding this letter, please contact us at your earliest convenience.
Sincerely,
ASSOCIATED EARTH SCEINCES, INC.
Kirkland, Washington
Timothy J. Peter, L.E.G., L.Hg.
Senior Engineering Geologist
TJP/Id - 20190101EO01-5
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Matthew A. Miller, P.E.
Principal Geotechnical Engineer
2