Loading...
HomeMy WebLinkAboutBuilding Miscellaneous 2011-6-27 @ Branch Engineering, Inc. Corporate Headquarters (541) 746-0637 310 Sib Street Springfield, DR 97477 Salem Engineering Office (503) 779--2577 4310 Cheny Avenue NE Salem, DR 97303 Principals M. Lane Branch, PE Damien Gilbert. PE Renee D. Clough. PE. PLS Rene' Fabricant. PE. SE Ronald J. DeRick, PE. GE www.BrancbEngineering.com June 27, 2011 Bruce Wiechert Custom Homes, Inc. 3073 Skyview Lane Eugene, Oregon 97405 RE: SUBGRADE EvALUATION 6100 GRA YSTONE LOOp (LoT 14) SPRINGFIELD, OREGON Branch Engineering Inc Project No. 10-207 A geotechnical engineer visited the above referenced site on June 21 & 24, 2011, to observe the building pad dig-out and assess the' shrink/swell potential and soil bearing capacity of the subgrade for construction of a single family residence. During the initial visit, the excavator was into fractured basalt and having difficulty excavating the building pad to grade. The relatively flat building pad was excavated 6- to 8-inches exposing hard basalt bedrock. The rock and limited soil has a low to moderate shrink/swell potential. Subsequently, 2- to 4-inches of compacted, %,'-0 crushed aggregate was placed to smooth the pad. The subgrade and aggregate fill are suitable for a conventional perimeter-style foundation, and an allowable soil '--beanngcapacity 00,000 psf. Differential settlements are expected to be less negligible. Footi~g drains ~~.. not required as the subject lot and surrounding properties are relatively flat and near the same elevation. Final perimeter landscape grades shall slope away from the foundation and surface water shall not be allowed to pond adjacent to the foundation. Sincerely, Branch Engineering lnc, Ronald J. Derrick, P.E., G.E. Principal Geotechnical Engineer Expires 12/3112011 CIVIL STRUCTURES TRANSPORTATION GEOTECHNICAL SURVEYING