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Report _1 GeoPacific Engineering, Inc, Real -World Geotechnical Solutions Investigation • Design • Construction Support April 15, 2013 GeoPacific Project No. 11 -2373 Attention: Alan Goffmore Pacific Evergreen Homes 7410 SW Oleson Road #133 Portland, OR 97223 Fax 503 - 208 -7127 Alan c(r� PacificEvergreenHomes.com FOUNDATION EXCAVATION REVIEW 77 fS '-c/ Cc rzh Li - r LOT 23 — BRITTANY MEADOWS CITY OF TIGARD, OREGON al©(3 --000 7( GeoPacific Engineering Inc. visited the site today to review the single family home foundation layout on Lot 23. 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 most cuts sloped back. The deeper parts of the excavation consisted of predominantly medium dense native sand soil that could be probed about 1 to 4 inches with medium to heavy pressure using a steel "T" bar probe and the shallow parts exposed stiff silt. 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 sandy soils encountered throughout the site, erosion is the biggest concern. Foundations should also incorporate appropriate drainage measures in accordance with the International Residential Code. Adequate drainage is not something that geotechnical consultants can verify; the purpose of our visit is for observations of foundation bearing conditions only. Some structural backfill is required to support the bank above the daylight basement retaining wall. 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, ���ED PR°Pe GeoPacific Engineering, Inc. �C� / IN EF.p - O ' 147 /` 'A , . l /J>� OR EGO / 4/ •23� *, James D. Imbrie, G.E. M FS D, 114W Geotechnical Engineer EXPIRES: 06/30/2013 14835 SW 72 Avenue Tel (503) 598 -8445 Portland, Oregon 97224 Fax (503) 941 -9281