Report Jan. Li LVI'+ 4: Llrin luo, 4I)/ r. I
GeoP ' fN
Engineering,Inc.
Real-World Geotechnical Solutions
•Investigation
•Design
•Construction Support
January 23, 2014
Project No. 03-8449
Stonebridge Homes Job No. 1465
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Attention: Andy Thomas and Jim Delmore `5�z c t 3 ' '
Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
Email JimDt stonebridgehomesnw.com
FOUNDATION SUBGRADE REVIEW
LOT 94—ARLINGTON HEIGHTS NO. 3
15492 SW SUMMERVIEW DRIVE
CITY OF TIGARD,OREGON
GeoPacific Engineering Inc. visited the site today to review the single family home foundation
subgrade on Lot 94. The foundation excavation reached compact reject rock over most of the
excavation. 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. Footing- to-slope setbacks are adequate and footing-to-wall setbacks are not
an issue.
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 Y2 inch of loose soils is present prior to
pouring concrete.
14835 SW 72n°Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
Jan. 2i. 2U 14 4: 21 VIVI No. 417/ r.
GeoPacif.. �������ee����a, Inc.
Job No.03-8449 . 5 i,,2dl?_0°o?q
Lot 94 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.
,\<8 PROF.
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'I OREGON
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EXPIRES:06!30120.
James D_ Imbrie, G.E.
Geotechnical Engineer
FOUNDATION CERTIFICATION /5+92 5�
LOT 94 OF "ARLINGTON HEIGHTS NO. 3" S-�-^ E J
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CITY OF TIGARD, WASHINGTON COUNTY, OR f'-‘ X13 -vo244�
\ 2 LOT 93 1 ' ; { 611 j.,,,3r., 1194'1j
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LOT 94 "'
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LOT 95
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�1 SCALE 1" = 30 FEET
i C 7.00' 21.50'
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PUE = PUBLIC UTILITY EASEMENT PREPARED FOR
SDE = STORM DRAINAGE EASMENT STONE BRIDGE HOMES NW
SSE = SANITARY SEWER EASEMENT
WME = WALL MAINTAINANCE EASEMENT 16869 SW 65TH AVE #505
LAKE OSWEGO, OR 97086
I, ROBERT RETTIG, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE
I
ACCURATELY STAKED THE FOUNDATION FOR LOT 94 OF "ARLINGTON HEIGHTS NO. 3" WITH HUBS AND TACKS.
Of - 2.Li. —1 Lf
REGISTERED
PROFESSIONAL JOB NAME: ARLINGTON HEIGHTS AKS ENGINEERING AND FORESTRY, LLC
LAND S U R V E�O R 13910 SW GALBREATH DR
JOB NUMBER: 2643 SUITE 100
�� SHERWOOD, OR 97140 AK
PHONE: 503.925.8799
ORrEG
L. ,-
DRAWN BY: MEB FAX: 503.925.8969
JANUARY 11, 2005
ROBERT D. RETTIG CHECKED BY: RDR ENGINEERING - PLANNING - SURVEYING
60124LS
RENEWS: 12/31/14 DWG NO.: 2643CSTK FORESTRY • LANDSCAPE ARCHITECTURE