The URL can be used to link to this page

Report 4' GeoP Wit Engineering, Inc. Real -World Geotechnical Solutions Investigation • Design • Construction Support March 20, 2012 Project No. 04 -8996 Lennar Corporation 12013 NE 99th Street, Ste. 1650 Vancouver, WA 98682 Via email: chris.mevers[cr�lennar.com L W,6 fl A4 P /,)t= C r14 , 37 w "y david.cady FOUNDATION EXCAVATION REVIEW Sr �° - a30 LOT 6 — ALPINE VIEW CITY OF TIGARD, OREGON Reference: Soil Engineers' Summary Report, Alpine View Subdivision, Tigard, Oregon, GeoPacific Engineering, Inc. report dated January 30, 2006. GeoPacific Engineering Inc. visited the site on March 19 to review the single family home foundation excavation on Lot 6. We understand that the proposed building is a two -story home. At the time of our site visit, soils exposed in foundation excavation on Lot 6 consisted of predominantly stiff native silt soil. The observed soils are considered adequate to support the planned foundation loads and 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. Footing -to -slope setbacks are approximately 5 feet horizontal and foundation embedment depths appeared adequate. 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. In general, footing excavations should be cleaned such that no more than about 'h inch of loose soils is present prior to pouring concrete. A short length of retaining wall will need to be constructed at the northwest corner of the home between the foundation corner and a Lock -n -Load wall. 14835 SW 72 Avenue Tel (503) 598 -8445 Portland, Oregon 97224 Fax (503) 941 -9281 GeoPacific Engineering, Inc. Job No. 04 -8996 Lot 6 Alpine View Subdivision 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. ■ �tv,V0 PRO�f0 ,� 0GIN4 - /o L 147 f E / af OREGON � 40 D. EXPIRES: 06/30/2013 James D. Imbrie, P.E. Geotechnical Engineer