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Report 0. GeoPacific Euguieerinu Inc Real-World Geotechnical Solutions Investigation• Design•Construction Support • February 5, 2016 Project No. 12-2704 ,-‘5"72 - 00_220Stonebridge Project No. 1866 Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 Fax 503-387-7615 Email Andy©stonebridgehomesnw.corrm; JimDastonebridaehomesnw.com; kristen(admhhoklinasco.corn RE: FOUNDATION SUBGRADE REVIEW SOUTH VIEW SUBDIVISION LOT 29 12085 TURNAGAIN DRIVE TIGARD, OREGON References: GeoPacific Engineering, Inc., Geotechnical Explorations, Knauss Property Subdivision, 12035 Southwest Beef Bend Road, Washington County, Oregon, report dated August 10, 2012. GeoPacific Engineering Inc. visited the site today to review the single family home foundation subgrade on Lot 29. We understand that the proposed building is a two-story home, on upward sloping lot. In our opinion, the observed subgrade is generally adequate for support to an allowable bearing pressure of 2,000 psf. The expected maximum anticipated total and differential footing movements (generally from soil expansion and/or settlement) are less than 1 inch and �/, inch, respectively, over a span of 20 feet. At the time of our site visit, the excavation was nearly complete. The excavation consisted of predominantly hard rock. These materials are considered adequate to support the planned foundation loads. Footing-to-slope setbacks were not an issue and foundation embedment depths appeared adequate. Some structural backfilling will likely be required. Water is flowing onto the lot from above and needs to be collected and properly discharged. Due to silty soils encountered throughout the site, all foundations should incorporate appropriate drainage measures. 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. 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. 14835 SW 72"d Avenue Tel (503)598-8441 Portland, Oregon 97224 Fax(503)941-9281 A project No. 12-2704 South View Lot 29 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 fix, report was prepared. No warranty, express pr implied, is made. If you have any questions, please call. Sincerely, GEOPACIFIC ENGINEERING,INC. tQ`EO P1 OP c:\ GIN6-6:9 , rc 14 E ORES i Al ?d 23 \ � -9*.s D. MOP EXPIRES:06130120 James D. Imbrie, P.E., G.E. Geotechnical Engineer -2-