Report (59) RUN
Real-World Geotechnical Solutions
Investigation•Design•Construction Support
December 21, 2015
Project No. 13-3243
Pacific Evergreen Homes
7410 SE Oleson Road#133
Portland, OR 97223
Phone 503-664-6423
Fax Via email: alairaofirrareglgmail.com
Subject: FOUNDATION SUBGRADE REVIEW
Graceland Lot 3
Tigard, Oregon
GeoPacific Engineering Inc. visited the site December 215' to review the single family home
foundation subgrade on Lot 3. We understand that the proposed building is a two-story home. In our
opinion, the observed subgrade is marginally adequate for support to an allowable bearing pressure
of 1,500 psf. 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.
At the time of our site visit, the excavation was nearly complete and soil subgrade exposed in
foundation excavation consisted of predominantly medium stiff native soils that probed stiff at about
12 to 36 inches deep with moderate pressure using a steel "T" bar probe. Some loose soils were
observed near the front of the garage and a gopher hole is present on the south side of the garage
near the middle; these items should be corrected. Footing-to-wall and footing-to-slope setbacks are
not an issue and foundation embedment depths appeared adequate.
Due to relatively impervious silty and clayey soils encountered throughout the site, all foundations
should incorporate appropriate drainage measures in accordance with the International Residential
Code. Adequate crawlspace drainage is not something that geotechnical consultants can verify, the
purpose of our visit is for observations of foundation bearing conditions only.
Our work scope pertains to a geotechnical engineer's foundation excavation 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. / PROFF
Sincerely, ��/, GINEF�S/p
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GeoPacific Engineering, Inc.
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James D. Imbrie, G.E. 23
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Geotechnical Engineer
EXPIRES:06/30/201Z
14835 SW 72nd Avenue Tel(503)5988445
Portland,Oregon 97224 Fax(503)941-9281