Report -ul. 26. 2( 12 9: 1190 ti:, 3952
GeoP
Engineering,Inc.
Real-World Geotechnical Solutions
•Investigation
•Design
•Construotion Support
July 17, 2013
Project No. 03-8449 J �`� S`� S'(two/a-iv/el.,-
Stonebridge Homes Job No. 1428 L' _
Attention: Andy Thomas 729( 3`
Stonebridge Homes 6 1 S-7
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
FOUNDATION SUBGRADE REVIEW
LOT 55—ARLINGTON HEIGHTS NO.3
15154 SW SUMMERVIEW DRIVE
CITY OF TIGARD, OREGON
GeoPacific Engineering inc. visited the site this week to review the single family home foundation
layout on Lot 55. Some soft and organic fill was encountered in the rear footing fine of the home. This
material was removed. 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 Y4
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 stiff native soils 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.
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 7200 avenue Tel(503)5984445
Portland,Oregon 97224 fax(503)941-9281
u 1. 26. 2013 9: 20AM GeoPacific°tn95 neerin 2 Inc.
•
9 9�
Job No.03-8449
Lot 55 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 geotechni3al 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.
��, PRO/ 5
147
7 OREGON
444 AlPka
e1 SD, M#I
EXPIRES:06/30/20/5
James D. Inibrie, G.E.
Geotechnic;,l Engineer
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PREPARED FOR FOUNDATION CERTIFICATION
STONE BRIDGE HOMES NW ■
16869 SW 65TH AVE #505 ',, LOT 55 OF "ARLINGTON HEIGHTS NO. 3"
LAKE OSWEGO, OR 97086 ■ CITY OF TIGARD, WASHINGTON COUNTY, OR 3
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I, ROBERT RETTIG, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE
ACCURATELY STAKED THE FOUNDATION FOR LOT 55 OF "ARLINGTON HEIGHTS NO. 3" WITH HUBS AND TACKS.
o7-ZS- l3
REGISTERED ENGINEERING • PLANNING • LANDSCAPE ARCHITECTURE
PROFESSIONAL JOB NAME: ARLINGTON HEIGHTS FORESTRY • SURVEYING
LANK U ' YOR _ 4 -91. LICENSED IN OR & WA
JOB NUMBER: :::3
13910 SW GALBREATH
- Ar DRAWN BY: DRIVE, SUITE 100
ORE ON SHERWOOD, OR 97140
JANUARY 11, 2005 ' PHONE. (503) 925-8799
ROBERT D. RETTIG CHECKED BY: RDR ,Iv„yr�rr�►.�ifrsr�,rlclrvr
60124LS FAX FAX: (503) 925-8969
RENEWS: 12/31/14 DWG NO.: 2643CSTK OFFICES LOCATED IN SALEM, OR ∎* VANCOUVER, WA