Report X5352_ 51,,/ C k ca P/
•
GeOP
Engineering,Inc.
Real•World Geotechnlcal Solutions
•Investigation
•Design
•Construction Support
August 19, 2013
Project No. 03-8449 0c)1 72
Stonebridge Homes Job No. 1454 n ST2o /3 /1
Attention: Andy Thomas ,/537(v 5V. `t.50,04,TcM
Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
FOUNDATION SUBGRADE REVIEW
LOT 83—ARLINGTON HEIGHTS NO.3
15352 SW OAKMONT PLACE
CITY OF TIGARD,OREGON
GeoPacific Engineering Inc. visited the site this week to review the single family home foundation
layout on Lot 83. The foundation excavation was carried to hard rock to avoid surcharging the wall
below. In our opinion, the observed subgrade is now 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 3A inch, respectively,
over a span of 20 feet.
At the time of our final site visit, the excavation was complete and exposed stiff fill soils on the front
and hard rock on the lower footing line. These materials are considered adequate to support the
planned foundation loads. Footing-to-slope setbacks are adequate and footing-to-wall setbacks
are also adequate.
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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.
14835 SW 72°3 Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
GeoPacific Engineering, Inc.
Job No.03-8449
Lot 83 Arlington Heights No.3
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:08/30/20/
James D. imbrie, G.E.
Geotechnical Engineer
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FOUNDATION CERTIFICATION
LOT 83 OF "ARLINGTON HEIGHTS NO. 3"
CITY OF TIGARD, WASHINGTON COUNTY, OR
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I ,H-8.5' PUE LOT 82 i 25 I
' SCALE 1" = 20 FEET
PUE = UTILITY EASEMENT
SWE = PUBLIC PEDESTRIAN ACCESS EASEMENT 1.
CURVE TABLE WME = WALL MAINTENANCE EASEMENT '-
CURVE RADIUS DELTA LENGTH CHORD
Cl 14.00' ;012.2813011 3.05' N04'30'30 3.04' PREPARED FOR
STONE BRIDGE HOMES NW
C2' 35.50' 44'03'25° 27.30' N11'16'49°E 26.63' 16869 SW 65TH AVE #505
LAKE OSWEGO, OR 97086
I, NICK WHITE, A:REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE
ACCURATELY STAKED THE FOUNDATION FOR LOT 83 OF °ARLINGTON HEIGHTS NO. 3° WITH HUBS AND TACKS.
08/20/2013
REGISTERED •
PROFESSIONAL JOB NAME: ARUNGTON HEIGHTS AKS ENGINEERING AND FORESTRY, LLC
LAND SURVEYOR 13910 SW GALBREATH DR
JOB NUMBER: 2643 SUITE 100
SHERWOOD, OR 97140
PHONE: 503.925.8799
OREGON DRAWN BY: MEB FAX 503.925.8969
JANUARY 9, 2007 =
NICK WHITE CHECKED BY: NSW ENGINEERING • PLANNING • SURVEYING
70652LS FORESTRY • LANDSCAPE ARCHITECTURE
RENEWS: 6/30/14 DWG NO.: 2643CSTK