Report 1 7 7 -0/59
GooP; IUC
Engineering, Inc.; .
Real -World Geotechnical Solutions
Investigation • Design • Construction Support
June 21, 2005
Project No. 03 -8183
Attention; Andy
Venture Properties, Inc.
4230 Galewood Street, Suite 100
Lake Oswego, Oregon 97035
Fax No. 503 -670 -9099
RE: SOIL EN ER'S REVIEW OF FOUNDATION EXCAVATION SUBGRADE
LOTS 73 :AND 103 SUMMIT RIDGE
TIGARD, • - EGON
References:
1. GeoPacific Engineering Inc., Geotechnical Investigation, Summit Ridge Development, Tigard, Oregon, dated May 12,
2003.
2. GeoPacific 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 Imbrie, visited the site to review the foundation excavation subgrades for Lots 73,
84, and 103. On Lot 73, the observed native soil is stiff and slope or retaining wall setbacks are not an issue.
On Lot 84, the observed engineered fill is very stiff clay with rock and is adequately setback more than 10 feet
from a 6 -foot tall rear yard rockery retaining wall. On Lot 103, the observed engineered fill is very stiff clay with
rock and is adequately setback aboutl0 feet horizontal from a 9 -foot tall side yard rockery retaining wall.
Some mucking may be required if the subgrade is left exposed to wet weather for a long duration, however the
current subgrade is considered adequate. Based on our observations, it is our opinion that the current
foundation subgrade is suitable for spread foundation support to a maximum allowable bearing pressure of 1,500
psf. Minimum reinforcement has been recommended in the above Reference 2.
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. No deck footing, patio, 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,
GeoPacific Engineering, Inc.
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James D. Imbrie, P.E., C.E.G. .\\,f v 4 � " NciP
Geotechnical Engineer �4,�p� ® ' � � �; os