Report Oct 06 2003 9:47RM GeoPacific Engineering, I 503 - 598 -8705 p.1
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Real -World Geotechnical Solutions
Investigation • Design • Construction Support
October 6, 2003
Job No. 00 -4945
Attention: Andrew Thomas
Venture Properties, Inc.
4230 Galewood Street, Suite 100
Lake Oswego, Oregon 97035
Fax No. (503)670 -9099
RE: • GEOTECWNICAL ENGINEER'S FOUNDATION EXCAVATION REVIEW
THORNWOOD LOT 52
CITY OF TIGARD, OREGON
Reference: GeoPacific Engineering Inc., Soil Engineer's Summary at Conclusion of Earthwork,
Thornwood City of Tigard, Oregon, dated March 16, 2003.
GeoPacific Engineer, Jim Imbrie, has visited the above- referenced lot on September 29 The
purpose of our visit was primarily to review the foundation excavation subgrade, and footing proximity
to existing slope faces and terrace cuts. The nearest adjacent footing west (downslope) end for the
subject residence Is approximately 6 feet from the natural slope lace which is approximately 40
percent grade for about 15 feet. The west (lower) end of the excavation is below the base of the fill
slope.
The footing subgrade generally consisted of engineered fill on the front embankment and natural soils
at the lowest (rear) portion of the home. Both soil types probed stiff to very stiff. The current
subgrade Is considered adequate for spread foundation support. Based on our observations, the
foundation subgrade and excavation setbacks should be acceptable for support of the proposed
single - family home. No deck footing subgrades were observed. Some retaining walls are needed in
the middle of the home to retain tall vertical cuts and some backfilling will be necessary.
Our work scope for this phase of geotechnical review pertains to foundation bearing conditions only
and is limited to the conditions existing and exposed at the time of our site visits. If you have any
further questions, please call.
Sincerely,
GeoPacific Engineering, Inc.
7 4�
James D. Imbrie P.E., C.E.G. . • * 1OIRE GbN
Geotechnical Engineer �.� t3, � .03
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7312 SW Durham Road Tel (503) 598 -8445
Portland, Oregon 97224 Fax (503) 598 -8705
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