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GeoPettliC
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1oo10mw Galbreath Drive, Ste, 102
Sherwood, Oregon 97140
Tel (503) 625-4455 • Fax (503) 6254405
July 25. 2011
GeoPacific Project No. 11
Attention: Alan Goffmore '
Pacific Evergreen Homes
7410 SW Oleson Road #133
Portland, OR 97223
Fax 503-208-7127
AlanpPao0cEver,gOeeDfomescgm
FOUNDATION EXCAVATION REVIEW
LOT 28 — BRITTANY MEADOWS
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site on today to review the single family home foundation
layout on Lot 28 We understand that the proposed building is a two 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 3 /4 inrh, roypedive|y, over a span of 20 feet.
At the time of our site visit, the excavation was complete and consisted of predominantly very stiff to
hard compacted fill soil that could be probed 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 are not an issue and foundation embedment depths appeared adequate.
Due to silty clay soils encountered throughout the site, all foundations should incorporate
appropriate drainage measures. Crawlspaces should be provided with a low-point drain and pass
through pipes should be installed 1hrough•footingsvvhioh would otherwise restrict water flow to the
low-point drain,
Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after •
excavation. If footing bearing soils become saturated or dioturbed, any softened soil or slough
should be removed and replaced with crushed aggregate or additional concrete.
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. Geo Pacifc Engineering, inc. |
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Job No. 11-2373
Lot 28 Brittan Meadows
Our work scope pertains hoe 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 i
and budged. Geo Pacific attempted to execute these services in accordance with generally accepted .
professional principles and practices in the fields of geotechnical engineering and engineering i
geology at the time the report was prepared No warranty, express or implied, is made, If you have .
any questions, please call i
Sincerely,
Geo Pacific Engineering, Inc.
ArA OREGON 1- 7 .
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James D. Imbrie, G.E.
Geotechnical Engineer
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