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From: Rio
Date:
CJBI&ECONDISMA
GEOTECH
CONSULTANTS, INC.
13256 N.E.20th St.(Northup Way),Suite 16 February 10, 1995
Bellevue,WA 98005
(206)7475618
FAX 7478561 JN 95043
O'Keefe Development Corporation
7900 Southeast 28th Street, Suite 400
Mercer Island, Washington 98040 IX7Y OF REN ON
�}E C E I V ED
Attention: Tom Lee
JUN Z 7 1995
Subject: Geotechnical Engineering Study
Proposed Commercial Development BUILDING DIVISION
Southwest 34th Street at Springbrook Creek
Renton, Washington
Dear Mr. Lee:
We are pleased to present this geotechnical engineering report for the proposed warehouse
to be constructed on Southwest 34th Street in Renton, Washington. The scope of our work
consisted of exploring site surface and subsurface conditions, and then developing this
report to provide design criteria for foundations and pavements, and recommendations for
general earthwork. You authorized our work by accepting our proposal, P-3479, dated
January 13, 1995.
The subsurface conditions of the proposed building site were explored with seven test pits.
All of these test pits encountered a thick layer of gravelly, slightly silty, sand fill. The
maximum depth of the fill was 9.5 feet, and the minimum depth was approximately 6 feet. In
the center and northern portions of the site, the fill was underlain with 4 to 5 feet of organic
silt and amorphous peat. The soils below the maximum depth explored are anticipated to
be relatively loose, interlayered sands and silts. The soils below the fill soils are moderately
compressible. It is our professional opinion that the building may be supported on
conventional foundations supported on the existing fill soils. The post-construction,
long-term settlement due to the old fill, new fill, and building loads is anticipated to be on the
order of 4 inches. The thick layer of fill will tend to reduce differential settlement. However,
construction on the site without preloading involves some risk. To reduce this risk, the site
would need to be preloaded with at least 6 feet of additional fill. The greater than normal
preload height is suggested because of the presence of organic soils and the additional
weight of both the dock-high and existing fill soils.
�S� 3 36
t4
FEB 17 1995