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Report Jul. 13. 2011 5:08PM No. 1980 P. 1 .J GeoP ifs Engineering, Inc. 13910 SW Galbreath Drive Sherwood, Oregon 97140 Tel (503) 6254455 • Fax (503) 625-4405 July 13, 2011 Project No 03 -8449 M S Zd If c9 C ©e Attention: Blake Agate Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 Fax 503 - 387-7615 FOUNDATION EXCAVATION REVIEW LOT 66 — ARLINGTON HEIGHTS NO. 3 CITY OF TIGARD, OREGON GeoPacific Engineering Inc. visited the site yesterday and today to review the single family home foundation layout on Lot 66. 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 a/4 inch, respectively, over a span of 20 feet. The excavation was 1 to 3 feet deep to bench and level the lot. At the time of our site visit, soils exposed in the bottom of the foundation excavation consisted of predominantly compact rocky fill soil. These soils are considered adequate to support the planned foundation loads. Footing -to- slope setbacks were at least 5 feet horizontal on a gentle slope and foundation embedment depths appeared adequate. Due to silty clay soils encountered throughout the site, all foundations should incorporate appropriate drainage measures. Crawispaces 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. 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 future wet weather. Jul. 13. 2011 5:09PM 1No, 1980 P. 2 GeoPacific Engineering, Inc. Job No. 03 -8449 Lot 66 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 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, GeoPacific Engineering, Inc. PROpp . iNE�C & Lam-, ORM A z'j Es a.t M s EXPIRES: 06130120,1 , James D. Imbrie, G.E. Geotechnical Engineer