Report FOUNDATION CERTIFICATION
LOT 118 OF "ARLINGTON HEIGHTS" _
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CITY OF TIGARD, WASHINGTON COUNTY, OREGON
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STATE OF OREGON, HEREBY CERTIFY
THAT I HAVE.A000RATELY STAKED THE I - TRACT °D"
FOUNDATION FOR LOT 118 OF - - 1-- - - - - -
"ARLINGTON HEIGHTS" WITH HUBS AND N
TACKS. Mis ( go /3-o 0 /30 .
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REGISTERE ENGINEERING • PLANNING • LANDSCAPE ARCHITECTURE
PROFESSIONAL JOB NAME: ARLINGTON HEIGHTS FORESTRY • SURVEYING
SURVEY •-!.. LICENSED IN OR & WA
JOB NUMBER: 2643 ' i
AfAer ' :..
13910 SW GALBREAIH
DRAWN BY: BDT /BTB DRIVE SUITE 100
OREGON SHERWOD OR 97140
JANUARY 11, 2005 t PHONE. (503) 925 -8799
ROBERT D. RETTIG CHECKED BY: RDR Y,7d �y �+y,�l��rl�rrl;�i«rV�
60124LS FAX: (503) 925 -8969
RENEWS: 12/31/14 DWG NO.: 2643CSTK OFFICES LOCATED IN SALEM, OR & VANCOUVER, WA
/ 130
Jun, 24. 2013 3:38PM 2.Co�S7 Svc/ 6)"1 No. 3895 P. 1
CeoP*ifIu 101,4k
Engineering, Inc.
Real -World Geotechnical Solutions
• Investigation
• Design
• Construction Support
June 24, 2013
Project No. 03 -8449
Stonebridge Homes Job No. 1489
Attention: Andy Thomas
Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503 387 - 7615
FOUNDATION SUBGRADE REVIEW
LOT 118 — ARLINGTON HEIGHTS NO.3
12687 SW CANYONRIDGE COURT
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site this June to review the single family home foundation
layout on Lot 118. Some soft and organic fill was encountered in the rear footing line of the home.
This material was overexcavated and replaced with compacted granular fill. 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 3f inch, respectively, over a span of 20 feet.
At the time of our final site visit, the excavation was complete and exposed medium stiff to stiff fill
soils on the front and very compact granular reject rock on the rear footing line. Compaction tests
achieved 95 % of the standard Proctor. 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.
Due to relatively impervious soils encountered throughout the site, all foundations should incorporate
appropriate drainage measures in accordance with the International Residential Code. Adequate
crawispace 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 °d Avenue Tel (503) 5984445
Portland, Oregon 97224 Fax (503) 941 -9281
Jun. 24. 2013 3:38PM GeoPacif u cuy n ee iu rr y , I nc.
Job No. 03 -8449
Lot 118 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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OREGON
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EXPIRES: 06150120
James D. Imbrie, G.E.
Geotechnical Engineer