Report (53) •
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GeoPacifc ,
tngineednp,Inc.
Real-World Geotechnical Solutions
Investigation•Design-construction '"
February 9, 2016
Project No. 12-2704 / 6 5' S(, /4,-,,-,_ (A- rte_,
Stonebridge Project No. 1859
i,"-N.r7--2- 0i5- 002 '7Ci
Stonebridge Homes
- 4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
Email Andvla�stonebridciehomesnw.corrin; JimD(astonebridgehomesnw.com;
kristen(admhholdingsco.com
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RE: FOUNDATION SUBGRADE REVIEW
<z SOUTH VIEW SUBDIVISION LOT 22
4 _ 120es AUTUMNVIEW DRIVE
TIGARD, OREGON
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References: GeoPacific Engineering, Inc., Geotechnical Explorations, Knauss Property
Subdivision, 12035 Southwest Beef Bend Road,Washington County, Oregon, report
dateeAugust 10, 2012.
GecPacific Engineering Inc. visited the site today to review the single family home foundation
subgrade on Lot 22. We understand that the proposed building is a two-story home, on downward
sloping lot. 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.
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P.
At the time of our site visit,the excavation was,rleattyr.complete. The excavation
predominantly stiff engineered fill soils that.i Ss-than 1 to 6 inches with heaovy pressure using
a steel T bar probe. These soils are conskfe ed adequate to support the planned foundation loads.
) Footing-to-slope setbacks were adequate and foundation embedment depths appeared adequate.
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Some structural backfilling will likely be required. --t-�-r'-
'` Due to silty soils encountered throughout the site, all foundations should incorporate
drainage measures. Crawlspaces should be provided with a low-point drain and pass though 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 duringand after
excavation. If footing bearing soils become saturated or disturbed, any softened soil orslough '
should be removed and replaced with crushed aggregate or additional concrete. .
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14835 SW 72^y gvenue • `
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Portland Oregon 97224 — --__ .-----,–__________I
Tel(503
Fax(503)
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Project No. 1_-2704
South View Lot 22
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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EXPIRES:06/30/2:)1.7
James D. Imbrie, P.E., G.E.
Geotechnical Engineer
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