HomeMy WebLinkAboutMiscellaneous Field Test & Inspection Report 2014-1-12 livanch
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Since 1977
January 12, 2014 curl p transportation
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Mr.Derrick Westover s-URV E V IN CL e?.
Bruce Wiechert Custom Homes,Inc
3073 Sky view Lane
Eugene,Oregon 97405
RE BUILDING PAD SUBGRADE EVALUATION
6137 GRAVSTONE Loon
MOUNTAIN GATE WEST SUBDIVISION(PHASE IV)
SPRINGFIELD,OREGON
BRANCH ENGINEERING INC PROJECT NO.13 4117
A geotechnical engineer visited the above referenced site on January 10, 2014 to observe the
building pad excavation and assess the shrink/swell potential of the subgrade soil, and determine
the bearing capacity of the final building pad grade for construction of a single-family residence.
The flat, cut/fill pad has been scraped of vegetation with 6- to 24-inch perimeter cuts to expose a
hard miscellaneous stone fill subgrade. The pad was leveled by covering the subgrade with 2- to 6-
inches of compacted 3/4°-0 crushed aggregate. Testing of the subgrade soil indicated a low
shrink/swell potential(IS 2720 result of <5%).
The April 5, 2004 by Boire Associates Inc.indicates that this lot is in a hard rock cut area as
confirmed by our observations,with the exception of the south half which is filled with a native
stone mixture up to 4-feet in thickness. The slope stability of the lot is good and no other
geologic/geotechnical factors will impede site development as planned. The subgrade is suitable for
a conventional perimeter-style foundation, and an allowable soil bearing capacity of 2,000 psf. We
recommend that the foundation perimeter be backfilled and graded to slope away from the structure
as soon as concrete curing allows. Differential settlements are expected to be less than 1/4-inch
over a span of 20 feet. Footing drains are not required as the subject and adjacent lots area
relatively flat. Surface drainage shall be conveyed to a suitable disposal area, and final perimeter
landscape grades shall slope away from the foundation and surface water not be allowed to pond
adjacent to the foundation.
Sincerely,
Blanch Engineering Inc, PRot
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OREGON :
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EXPIRES: DECEMBER 31, 2015
Ronald J.Derrick,P.E.,G.E-
Principal Geotechnical Engineer
EUGENE-SPRINGFIELD SALEM-KEIZER
310 5t" Street,Springfield, OR 97477 I p- 541.746.0637 I www.branchengineering.com