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GEOPACIFIC
Real-World Geotechnical Solutions
Investigation • Design •Construction Support
February 8, 2021
Project No. 21-5719
Westland—Jim Standring
12670 SE 68th Avenue, Suite 400
Tigard, Oregon 97223
Via email: jswestlandCa�aol.com
SUBJECT: GEOTECHNICAL REVIEW FOR WEAK SOILS
6695 SW ALFRED STREET
TIGARD, OREGON
GeoPacific Engineering Inc. has visited the site to review the single-family home soil conditions at the
subject address. We understand that the proposed building is a two-story home. In our opinion, the
observed subsoils are generally adequate for support to an allowable bearing pressure of 1,000 psf; which
means that footing need to be 50 % larger to reduce the bearing pressures. The expected maximum
anticipated total and differential footing movements (generally from soil expansion and/or settlement) are 1
inch and inch, respectively, over a span of 20 feet.
The subgrade is anticipated to consist of predominantly medium stiff, native, Willamette Valley SILT.
Footing-to-slope setbacks should not be an issue. The potential for ground freezing is high in the next few
days.
Our work scope pertains to a geotechnical engineer's weak soils review only and the conditions existing
and exposed at the time of our site visit. Within the limitations of scope, schedule and budget, GeoPacific
attempted to execute these services in accordance with generally accepted professional principles and
practices in the fields of geotechnical engineering and engineering geology at the time the report was
prepared. No warranty, express or implied, is made. If you have any questions, please call.
Sincerely,
GEOPACIFIC ENGINEERING, INC.
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EXPIRES:06/30/2 `2.1
James D. Imbrie, G.E., C.E.G.
Principal Geotechnical Engineer
14835 SW 72nd Avenue Tel (503) 598-8445
Portland, Oregon 97224 Fax(503)941-9281