Report GeoP tic
Engineering. Inc.
13910 SW Galbreath Drive, Ste 102
Sherwood, Oregon 97140
Tel (503) 6264455 • Fax (503) 625.4406
February 14, 2012
Project No. 03 - 8449
Stonebridge Homes Job No. 1441
Attention: Dan Velasquez
Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503 - 387 -7615 and 503 - 746 -6214
FOUNDATION EXCAVATION REVIEW
LOT 70 — ARLINGTON HEIGHTS NO.3 /1
16374 SW SUMMERVIEW DRIVE
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site today and yesterday to review the single family home foundation
layout on Lot 70. 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 very stiff
residual soil that could be probed less than about % inches with medium pressure using a steel "T" bar probe.
These soils are considered adequate to support the planned foundation loads. The downslope rockery wall
required deepening the adjacent footing 3 feet below top of wall. Once the area was deepend, footing -to -wall
setbacks were not an issue and foundation embedment depths appeared adequate.
We understand that the proposed residence will be a two- story single - family home with slabs -on- grade. 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.
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.
54 t Ppp�Fss
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147 CA
t e 4 o op
James D. Imbrie, G.E.
Geotechnical Engineer
EXPIRES: 061/1