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To: Richard L. White
The White House Collection
13817 SW Benchview Terrace
Tigard, Oregon 97223
Date: January 30, 20187 7
Fro m: StigVV}deU, PE
Associate
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EXPIRES: 6-30—
��E: Sherman Engineering Project:#P17-0Q63 —
Smart Residence
lZO755VVRose Vista Dr �--
Tigard, OR 97223
This memo is in response to the inspection report by David Young ofthe [itvof Tigard.
VVehave revievxedthe |ocahonand details for the Lida box aYthe front nfthe above
referenced pject. The attachment of the planter to the standard wall construction
shown in detail A2 is acceptable.
If you have any questions please give us a call.
File K4em0'0l3O18'Smart Residence.doC
CooP l,17„,„
Engineering,Inc.
Real-World Geotechnical Solutions
February 13, 2018 Investigation• Design • Construction Support
Project No. 18-4849
Rafe Veenker
The Hollman Company
3011 SW Riverfront Terrace
Wilsonville, OR 97070
phone503-701-3265
Email rafeOhollmanco.corn
FOUNDATION SUBGRADE REVIEW
12075 SW ROSE VISTA DRIVE
TIGARD, OREGON
GeoPacific Engineering Inc. visited the site yesterday and last week to review the single family home
foundation subgrade at the above address. We understand that the proposed building is a two-story
home. In our opinion, the observed subgrade is adequate for support to an allowable bearing
pressure of 1,500 psf.
At the time of our site visit, the excavation was complete and soils exposed in foundation excavation
consisted of predominantly stiff native silt soils that could be probed about 3 to 6 inches with
moderate pressure using a steel "T" bar probe. 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. It should be noted that the on-site soils are very moisture
sensitive and will soften significantly in wet weather conditions if not adequately protected. Also
some structural backfilling of vertical steps is anticipated to laterally support the exposed cuts.
Due to relatively impervious silty and clayey 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.
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
Portland, Oregon 97224 Tel(503)598-8445
Fax (503)941-9281
f GeoPacific Engineering, Inc.
Job No. 18-4849
12075 SW Rose Vista Drive
Sincerely,
GeoPacific Engineering, Inc.
oF 14743P /
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V OREGON
(4/44. 3
EXPIRES:061301210
James D. Imbrie, G.E.
Geotechnical Engineer
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STAKEOUT
AdORIG.DATE: 1/18/18 a7 /1 G V/
DRAWN BY: BB LOT2, COLONIAL VIEW CENTERLINE CONCEPTS
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