RESUB 1-BLD2024-0804+Geotechnical_Vault Cover Sheet+7.29.2024_10.14.42_AM+4406519BLD2024-0804 RESUB
Jul 30 2024
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
PmGE@
P O R A T E D
Geotechnical & Earthquake
Engineering Consultants
July 26, 2024
File No. 22-237.200
HBRE Investments
Attn: Augustus Bukowski
1951 3rd Avenue West
Seattle, WA 98119
Subject: Geotechnical Plan Review
Detention Vault
310 Daley Street, Edmonds, Washington
Dear Mr. Bukowski:
As requested, PanGEO reviewed the geotechnical engineering aspects of the current
detention vault plans and calculations for the above -referenced project. Our review
includes the following:
• Detention vault structural plan V 1.0 last revised on July 19, 2024 by Built
Engineering; and
• Structural calculations by Built Engineering.
The reviewed plan and calculations used an allowable soil pressure of 2,000 psf and an
active earth pressure of 35 pcf for design. PanGEO did not prepare a geotechnical design
report for the proposed project. The test pits excavated during infiltration testing
encountered 2 to 3 feet of topsoil/fill overlying medium dense to dense sand and silty
sand that extended to at least 8 feet below the surface. Based on the current plan, the
vault bottom is located at about 7 to 10 feet below the surface, and the vault subgrade soil
is anticipated to be native, medium dense to dense sand/silty sand. As such, in our
opinion, the soil design values used in the design is considered appropriate and the vault
subgrade should provide at 2,000 psf allowable bearing pressure.
3213 Eastlake Ave E, Ste B
Seattle, WA 98102
Tel:(206) 262-0370
www.pangeoinc.com
Geotechnical Plan Review
Detention Vault: 310 — Daley Street, Edmonds, Washington
July 26, 2024
Sincerely,
7161024
Michael H. Xue, P.E.
Principal Geotechnical Engineer
22-237 310 Daley St, Edmonds - Plan Review July 2024.doc 2 PanGEO, Inc.