Report GEDPACIFIC
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Real-World Geotechnical Solutions
Investigation • Design •Construction Support
February 6, 2024
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Project No. 16-4108 ' �4 o,oii y
Stonebridge Job No. 3283
2oZ3 '-
Attention: Andy Thomas
Stonebridge Homes NW LLC 0 0 3 10
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
Email A,rdy(c�stonebridgehomesnw.com; Jim D(a�stonebridgehomesnw.com;
kristen@dmhholdingsca.com
FOUNDATION SUBGRADE REVIEW
LOT 191 RIVER TERRACE CROSSING
15555 S.W. EVERGLADE AVENUE
WASHINGTON COUNTY, OREGON
GeoPacific Engineering Inc. visited the site today to review the single-family home foundation
subgrade at the above address. We understand that the proposed building is a two-story home. In
our opinion, the observed subgrade is adequate for support to an allowable bearing pressure of
1,500 psf.
At the time of our site visit, the excavation was complete and soils exposed in foundation excavation
consisted of predominantly stiff fill rocky soils that could be probed about 1/2 to 2 inches with
moderate pressure using a steel "T" bar probe. 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. The lot is nearly flat with an upslope in the rear property
line. Footing-to-wall and footing-to-slope setbacks were not an issue.
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.
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 72nd Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
• GEOPACIFIC
Job No. 16-4108
Lot 191 River Terrace Crossing
Sincerely,
GeoPacific Engineering, Inc.
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EXPIRES:06/30/20;4 y
James D. Imbrie, G.E.
Geotechnical Engineer