Loading...
Report /14 -r aol'-©Oo?/ Ceorãcutuc Engineering,Inc. Real-World Geotechnical Solutions Investigation•Design•Construction Support July 15, 2014 Project No. 13-3103 Kurt Dalbey Spectrum Development PO Box 1689 Lake Oswego, Oregon 97035 FOUNDATION EXCAVATION REVIEW LUKAR RIDGE LOT 2 14221 SW LUKAR COURT TIGARD, OREGON Reference: Geotechnical Report, Lukar Ridge Subdivision, 14235 SW Fern Street, Tigard, Oregon, September 6,2013. GeoPacific Engineering Inc. visited the site yesterday to review the single family home foundation subgrade on Lot 2. 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, soils exposed in foundation excavation consisted of stiff native soils and very stiff to hard compacted fill that could be probed less than about 1 to 2 inches with medium pressure using a steel "T" bar probe. These soils are considered adequate to support the planned foundation loads. Footing-to-slope setbacks were not an issue. The contractor placed a protective layer of gravel. Due to relatively impervious clayey silt soils encountered throughout the site, all foundations should incorporate appropriate drainage measures in accordance with the International Residential Code. Adequate crawispace drainage is not something that geotechnical consultants can verify; the purpose of our visit is for observations of foundation bearing conditions only. 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 implies '•,•r- ou have any questions, please call. Sincerely, �5 ` GtNFc�,9 o,. ct/147 % .IeJ GeoPacific Engineering, Inc. f • ,' OREGON ' '49114E D.1M�P\�l. James D. Imbrie, G.E. Geotechnical Engineer EXPIRES:06130120,E 14835 SW 72nd Avenue Tel(503)598-8445 Portland,Oregon 97224 Fax(503)941-9281