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Report 57 z (2 - b /4q = _ CeoPgiihc Engineering, Inc. Real -World Geotechnical Solutions Investigation • Design • Construction Support September 17, 2012 Project No. 10 -2155 Mission Homes NW LLC PO BOX 1689 Lake Oswego, OR 97035 Phone 503 - 927 -1029 Fax 503 - 747 -5729 Email dalbev007@gmail.com FOUNDATION EXCAVATION REVIEW LOT 6 — HIGHLAND HILLS CITY OF TIGARD, OREGON GeoPacific Engineering Inc. visited the site today to review the single family home foundation layout on Lot 6. We understand that the proposed building is a two -story home. 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' inch, respectively, over a span of 20 feet. At the time of our site visit, soils exposed in foundation excavation consisted of moderately compact silt fill and medium stiff native silt that could be probed less than about 1/2 inches with medium pressure using a steel •T" bar probe. These soils are considered adequate to support the planned foundation loads. Footing - to-slope setbacks were not an issue. Crawlspaces should be provided with a low -point drain and pass through pipes should be installed through footings which would otherwise restrict water flow to the low -point drain. Due to relatively impervious clayey silt soils encountered throughout the site, all foundations should incorporate appropriate drainage measures in accordance with the International Residential Code. Adequate crawispace 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. Sincerely, •�Q I EO PROPF '� . � c S ips GeoPacific Engineering, Inc. 1470,FE OREGON / 23 css James D. Imbrie, G.E. 750.1M Geotechnical Engineer EXPIRES: 06/30/20 14835 SW 72 Avenue Tel (503) 598 -8445 Portland, Oregon 97224 Fax (503) 941 -9281