Report G
Engineering, Inc.
13910 SW Galbreath Drive, Ste. 102
Sherwood, Oregon 97140
Tel (503) 625 -4455 • Fax (503) 625 -4405
January 10, 2012
GeoPacific Project No 12 -2492 > 5 b it — n d /10
Fish Construction ) LiGZ0 �1L._
justinefishconstructionnw.com / ] ,( [ J
1834 SW 58th Ave., Ste. 102
Portland, OR 97221
Phone 503 - 292 -9891
Fax 503 - 297 -5801
FOUNDATION EXCAVATION REVIEW
LOT 31- BRITTANY MEADOWS
TIGARD, OREGON
GeoPacific Engineering Inc. visited the site on yesterday to review the single family home foundation layout on
Lot 31. We understand that the proposed building is a two -story home with a basement In our opinion, the
observed subgrade is generally adequate for support to an allowable bearing pressure of 1,500 psf, with the
possible exception of the SE corner where the storm lateral may interfere with the corner of the foundation. If
the lateral interferes, then it may need to be relocated and granular fill recompacted at this location.
At the time of our site visit, the excavation was complete The excavation consisted of predominantly medium
dense, silty sand, native soil that could be probed about 1 to 3 feet 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. The expected maximum
anticipated total and differential footing movements (generally from soil expansion and/or settlement) are 1
inch and Y. inch, respectively, over a span of 20 feet.
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
through footings which 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.
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. S O .I M�'
Geotechnical Engineer
XPIRES• 06/30/201