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Report GeoP if Engineering, Inc. Real -World Geotechnical Solutions Investigation • Design • Construction Support July 11, 2012 GeoPacific Project No. 11 -2373 p Pacific Evergreen Homes 7410 SW Oleson Road #133 Portland, OR 97223 Fax 503 - 208 -7127 Alan u( PacificEvergreenHomes.corn FOUNDATION SUBGRADE REVIEW LOT 10 — BRITTANY MEADOWS CITY OF TIGARD, OREGON GeoPacific Engineering Inc. visited the site on today to review the single family home foundation subgrade on Lot 10. 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 3 /4 inch, respectively, over a span of 20 feet. At the time of our site visit, the excavation was complete and consisted of predominantly very stiff to hard compacted fill soil that could be probed about 1 inch with medium pressure using a steel "T" bar probe. These soils are considered adequate to support the planned foundation loads. Footing - to -slope setbacks are not an issue and foundation embedment depths appeared adequate. 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. Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after excavation. If footing bearing soils become saturated or disturbed, any softened soil or slough should be removed and replaced with crushed aggregate or additional concrete. 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 72 Avenue Tel (503) 598 -8445 Portland, Oregon 97224 Fax (503) 941 -9281 • GeoPacific Engineering, Inc. Job No. 11 -2373 Lot 10 Brittany Meadows Sincerely, GeoPacific Engineering, Inc. \y; a PRQfFS GtNEF 4W 14 E i / • IRE I EXPIRES: 06130120L James D. Imbrie, G.E. Geotechnical Engineer