HomeMy WebLinkAboutPermit Field Test & Inspection Report 2007-3-1
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No,2169
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K & A Engineering, Inc,
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
March 1, 2007
HaYden Enterprises, Inc,
2464 SW Glacier Drive #110
Redmond, OR 97756
PrOject: 151,06
SUbject Jasper Meadows subdivision--Lot 201
Springfield, OR
Foundation Soils
PURPOSE AND SCOPE
At your request, K & A Engineering, Inc, has completed a geotechnical investigation of the existing soils on the
subject property, Our understanding is that a wood-framed single-family residence supported by a cast-in-
place concrete spread footing foundation is proposed for construction on this site.
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The purpose of our investigation was to determine the suitability of the soils for construction of the proposed
structure, and proVide recommendations for construction of the foundation, The scope of our services is limited
to general suitability with respect to bearing capacity and expansive soils,
FOUNDATION PAD PREPARATION
The project site is located on a residential lot on the north side .of Cinder St. in the new" Jasper Meadows'
subdivision, The lot is level and there are no apparent slope movement hazards,
Based on the foundation pad excavation, soils consist of approximately 25-inches of dark brown, loose, organic
silts, over moist, tan, decomposed sandstonE!-, ____._. .__
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Foundation preparation involved constructing a level foundation pad on native undisturbed soils, This required
stripping and removing approximately 25-inches Of loose silts in the foundation pad area, After the excavation
and removal of the unsuitable SOils, approximately 12 to 18-inches of 8-inch minus crushed quarry "pit run"
was placed and compacted on the foundation pad area, followed by 12-inches of o/.,-inch minus dense graded
crushed aggregate. This served to provide a unfform surface for footing construction. The fill materials were
pi aced in maximum lifts of 12-inches and compacted using a vibratory steel drum roller, We inspected the
foundation pad excavation, prior to placement of the granular fills,
We inspected the placement of the 8-inch minus crushed quarry "pit-run" and the o/.,-inch minus dense-graded
crushed aggregate, The "pit-run" was too large to test for maximum dry denSity and optimum water content by
conventional laboratory testing, therefore, adequate compaction was determined in the fieid by visual inspection
of the compaction effort
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No.2169 P 2
K & A Engineering, Inc.
We tested the in-place density of the crushed aggregate fill and have dete/)1Jined that the average dry density
exceeds 95% of maximum as determined by ASTM 0698, The field test results are attached to this report
SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to suPPOrt the proposed foundations, We recommend a design
allowable bearing capacity of 2,500-pounds per square foot.
The soils present a mOderate shrinll/swell hazard, Foundation loads should bear on undisturbed native silts a
minimum depth of 36-inches below final grade around the perimeter foundation, The prepared foundation Dad
meets these requirements.
Final grading around the foundation pad should raise the grade above the foundation uSing native or imported
silts and should slope away from the foundation.
We recommend approval of the foundation pad, as constructed, by the building official.
Thank you for the Opportunity to be of service. Please call us if you have questions or need further aSsistance,
RespeCtfUlly,
Steve Schultz, E.I, T
K & A Engineering, Inc.
'EXPIRES
Client Hayden Enterprises Jasp~r Meadows-Lot 201 , Springfield, OR
Project: 15106
Page 2 of 2
March 1, 2007