Report CeoP i
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Real -World Geotechnical Solutions
Investigation • Design • Construction Support
July 19, 2012
GeoPacific Project No. 11 -2373
•
Pacific Evergreen Homes
7410 SW Oleson Road #133
Portland, OR 97223
Fax 503 - 208 -7127
Alan @PacificEvergreenHomes.com
FOUNDATION SUBGRADE REVIEW
LOT 9 — BRITTANY MEADOW
CITY OF TIGARD, OREGON �, ►i
GeoPacific Engineering Inc. visited the site on today to review the single family home foundation
subgrade on Lot 9. 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 3 / inch, respectively, 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 1/2 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 relatively impervious silty and clayey soils encountered throughout the site, all foundations
should incorporate appropriate drainage measures in accordance with the International Residential
Code. Adequate crawlspace drainage is not something that geotechnical consultants can verify; the
purpose of our visit is for observations of foundation bearing conditions only.
Care should be taken to avoid saturation or disturbance Of footing subgrade soils during and after
excavation. If footing bearing soils become saturated or disturbed, any softened soil or slough
should be removed and replaced with crushed aggregate or additional concrete.
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.
14835 SW 72 Avenue Tel (503) 598 -8445
Portland, Oregon 97224 Fax (503) 941 -9281
GeoPacific Engineering, Inc.
Job No. 11 -2373
Lot 9 Brittany Meadows
Sincerely,
GeoPacific Engineering, Inc.
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EXPIRES: 06/30/20
James D. Imbrie, G.E.
Geotechnical Engineer