Report GeoP die
Engineering,Inc.
Real-World Geotechnical Solutions
•Investigation
•Design
•Construction Support
May 29, 2014
Project No. 03-8449
Stonebridge Homes Job No. 1484 h S7 2 e 1 4, -0003.7
Attention: Andy Thomas and Jim Delmore
Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
Email andy(stonebridgehomesnw.com; JimD @stonebridgehomesnw.com
FOUNDATION SUBGRADE REVIEW
LOT 113—ARLINGTON HEIGHTS NO. 3
12723 SW WILLOW POINT LANE
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site this week to review the single family home foundation
subgrade on Lot 113. The foundation excavation reached medium stiff to stiff native soils over most of
the excavation. In our opinion, the observed subgrade is generally adequate for support to an
aliowable 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 3/4 inch,
respectively, over a span of 20 feet. Footing- to-slope setbacks are adequate and footing-to-wall
setbacks need a cast-in-place concrete landscape wall to support an adjacent rockery wall in the
western corner.
Due to relatively impervious 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. We observed some placement of crushed aggregate to protect the subgrade from wet
weather. If footing bearing soils become saturated or disturbed, any softened soil or slough should
be removed and replaced with crushed aggregate or additional concrete. In general, footing
excavations should be cleaned such that no more than about 1/2 inch of loose soils is present prior to
pouring 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 72nd Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
+► GeoPacific Engineering, Inc.
Job No.03-8449
Lot 113 Arlington Heights No.3 )74_;7--
Sincerely, --
GeoPacific I ineering, Inc.
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OREGON
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EXPIRES:08/30/20/5
James D. Imbrie, G.E.
Geotechnical Engineer
FOUNDATION CERTIFICATION irs •1+'
LOT 113 OF "ARLINGTON HEIGHTS NO. 3" 000317
CITY OF TIGARD, WASHINGTON COUNTY, OR
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REGISTERED \ I, ROBERT RETTIG, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON,
PROFESSIONAL HEREBY CERTIFY THAT I HAVE ACCURATELY STAKED THE FOUNDATION FOR LOT 113 OF
LAND UR Y O R "ARLINGTON HEIGHTS NO. 3" WITH HUBS AND TACKS.
PREPARED FOR ARLINGTON HEIGHTS
OI(E N STONE BRIDGE HOMES NW DRAY' BY:MEB CHECKED BY:RDR Dwc:2643CSTK !JOB: 2643
J NUARY 11, 2005 16869 SW 65TH AVE #505 AKS ENGINEERING & FORESTRY, LLC
ROBERT O. RETTIG LAKE OSWEGO, OR 97086 13910 SW GALBREATH DR SUITE 100
60124LS SHERWOOD, OR 97140 www.aks-eng.com
RENEWS: 12/31/14 PHONE: 503.925.8799 FAX: 503.925.8969 11±9( .