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Report (12) 4 GeoPacific infinsEcm Real-World Geotechnical Solutions Investigation• Design •Construction Support October 26, 2015 Project No. 12-2704 Stonebridge Project No. 1856 tit r295 - ux47 Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 Fax 503-387-7615 Email Andyastonebridgehomesnw.com; JimDAstonebridgehomesnw.com; kristen(c�dmhholdingsco.corn RE: FOUNDATION SUBGRADE REVIEW SOUTH VIEW SUBDIVISION LOT 19 12�073�A_U�T anallaaSTiREET —'T'IGARD, 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 on yesterday to review the single family home foundation subgrade on Lot 19. We understand that the proposed building is a two-story home, garage under layout on an upward sloping lot. 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 '/4 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 very stiff residual soil that could be probed less than 2 to 24 inches with heavy pressure using a steel "T" bar probe. These soils are considered adequate to support the planned foundation loads. Footing-to-slope setbacks were adequate and foundation embedment depths appeared adequate. Some structural backfilling will likely be required. Due to rocky and 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"` Avenue Tel (503)598-8445 Portland, Oregon 97224 Fax (503)941-9281 } Project No. 12-2704 South View Lot 19 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. PROFeS �? GINFsv cc 47a i Ir OREGON v:CIN 23 1c'A, i EXPIRES:06/30120/7 James D. Imbrie, P.E., G.E. Geotechnical Engineer - 2 -