Report 09/08/2005 09:36 5035988705 GEOPACIFIC ENG INC PAGE 01
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Real -World Geotechnical Solutions
Investigation • Design • Construction Support
September 8, 2005
Project No. 03 -8183
Attention: Andy
Venture Properties, Inc.
4230 Galewood Street, Suite 100
Lake Oswego, Oregon 97035
Fax No. 503 - 870 -9099
RE: SOIL ENGINEER'S REVIEW OF FOUNDATION EXCAVATION SUBGRADE
LOT 93 AND 18 SUMMIT RIDGE
TIGARD, OREGON
References:
1. GeoPaabc Engineering Inc., Geotechnlcal Investigation, Summit Ridge Development, Tigard, Oregon, dated May 12,
2003.
[. cuaoeaeItie Engineering Inc., Soil and Wall Engineer's Summary at Conclusion of Earthwork, Summit Ridge Development
- Phase 1, Tigard, Oregon, Revised January 21, 2004 (should state 2005).
GeoPacific Engineer, Jim Imbue, visited the site to review the foundation excavation subgrades on the above -
referenced lots. The observed fill soils are compact silty clay with rock. Some mucking may be required if the
subgrade is left exposed to wet weather for a long duraltinn. Rased on our observations, it is our opinion that
the current foundation subgrade is adequate for spread foundation support to a maximum allowable bearing
pressure of 1,500 psf. Minimum reinforcement has been recommended in the above Reference 2. The existing
rockery wall at the roar of the lots is close to the foundation, however the g,adeb !now Imen excavated to a depth
such that the foundations are below the wall's zone of influence.
Our work scope pertains to a geotechnlcal engineer's foundation excavation review only and the conditions
existing and exposed at the time of our site visit. If pad footings a located near vertical cuts, within e 1 H:1 V
plane, then the cuts should be supported by backfilling or other means. No deck feinting, natio, or other
appurtenant structure subgrades were observed. Our work was performed to the current local standards of
practice. No other warranty is herein expressed or implied, If you have any questions, please call.
Sincerely,
GeoPaclflo Engine. tni 0 F
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James D. Imbrie, P.E., tgt
Geotechnical Engineer