Report ..
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GeoPacdic
Engineering.Inc.
Real-World Geotechnical Solutions
Investigation • Design• Construction Support
September 4, 2014
Project No. 13-3103 n
Kurt Dalbey /ti s A/C)/L/-a) l �.._
Spectrum Development
PO Box 1689
Lake Oswego, Oregon 97035
GARAGE WALL FOUNDATION SUBGRADE REVIEW
LUKAR RIDGE LOT 6
TIGARD, OREGON
Reference: Geotechnical Report, Lukar Ridge Subdivision, 14235 SW Fern Street, Tigard,
Oregon, September 6, 2013.
GeoPacific Engineering Inc. visited the site again on September 4`h to review the 8-foot tall gar4age wall
foundation subgrade on Lot 6. In our opinion, the observed subgrade is generally medium stiff to stiff native
soils and is 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, the excavation depths averaged about one foot at the toe to 3 feet at the heel.
Soils probed medium stiff to stiff, about 2 to 6 inches. These soils are considered adequate to support the
planned foundation loads. Footing-to-slope setbacks were not an issue.
Due to relatively impervious clayey silt 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.
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, cFEO PRQ1c
S \ GINEF' ` 4
GeoPacific Engineering, Inc. 14743 91
OREGON
7 v4,4!23 �c-�<<'
James D. Imbrie, G.E.
Geotechnical Engineer EXPIRES:06/30/2015
14835 SW 72nd Avenue Tel (503) 598-8445
Portland, Oregon 97224 Fax(503)941-9281
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GENERIC RETAINING WALL FOR STANDARD PRACTICE VALUES
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L DESIGN vALIES ARE BASED ON STANDARD PRACTICE vAL ES
2. Ali nu/AN•SOIL BEARNG,1500 PSF,PASSIVE•2S0 PSF/FT.GRAPE TCP V.PRECTg1•35
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SOIL RFFCRT,0EOTE04 SITE vl51T REPORTS TO SE CORED TO I7CE
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