Correspondence Preili
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13910 SW Galbreath Drive, Suite 102
Sherwood, Oregon 97140
Tel (503) 625 -4455 • Fax (503) 625 -4405
June 10, 2011
Project No. 10 -2155
Mission Homes NW LLC
PO BOX 1689
Lake Oswego, OR 97035
Phone 503 - 927 -1029 40O•N�'15 LA)
Fax 503 - 747 -5729 1,2 �' � S
Email dalbev007(cr.gmail.com
• FOUNDATION EXCAVATION REVIEW (/I� S J � f3 I / — 0 Q o 6 3
LOT 7 — HIGHLAND HILLS
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site today to review the single family home foundation layout on Lot 7.
We understand that the proposed building is a two -story home. In our opinion, the observed subgrade is
generally 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, soils exposed in foundation excavation consisted of predominantly native silt and
thin, compact silt fill that could be probed less than about 1 inch with medium pressure using a steel "T" bar
probe. These soils are considered adequate to support the planned foundation loads. Footing -to -slope
setbacks were not an issue. Crawlspaces should be provided with a low -point drain and pass through pipes
should be installed through footings which would otherwise restrict water flow to the low -point drain.
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.
Sincerely,
GeoPacific Engineering, Inc.
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James D. Imbrie, G.E. ExPI ES. 06130
Geotechnical Engineer
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