HomeMy WebLinkAboutMiscellaneous Field Test & Inspection Report 2008-9-8
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'No.2775 P. 5 '
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K & A Engineering, Jne,
3327 Roanoke Ave" Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
enginepring
. September 8, 2008
Subject: Jasper Meadows subdivision,.Lot 245
Springfield, OR
Foundation Soils
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ProjeCt: 151.06 .
Hayden Enterprises, Inc,
2464 SW Glacier Drive #110
. Redmond, OR 97756
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,
The purpose of our investigation was to determine the suilability 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.
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FOUNDATION PAD PREPARATION
The project site is located on a residential lot in the Jasper Meadows subdivision on thewest side of South 57-
Place, The lot has a very gentle(l to 4-percent) west-facing slope, There is no apparent slope movement
hazard. The original ground surface was low lying and poorly drained, .
Based' on the foundation pad excavation, native soils consist of approximately 1 to 2-feet of brown, dry, loose,
organic silt, over multicolored, damp, moderately stiff, plastic clay with inclusions of decomposed sandstone,
There is a small amount of fill on some areas of the site as a result Of it being side-cast during the construction
of the subdivision infrastructure,
Foundation support preparation involved constructing a level foundation pad on a subgrade consisting of native
undisturbed soils. This required'excavating and removing approximately 1 to 2,5-feet of side-cast fill and
organic silt to reach gray plastic clay and decomposed sandstone in the foundation pad area~ After the
excavation and removal of the unsuitable soils, approximately 2 to 4-leet of "pit-run" was placed, graded, and
compacted in the foundation pad area, The "pit-run" consists of well graded silty crushed quarry stone with
crushed rock up to approximately 3-inches. An approximately 4 to 1 a-inch lift of :y.-inch minus dense graded
crushed aggregate was then placed, graded, and compacted over the "pit-run" fill. This served to provide a .
uniform surface for footing construction at the desired elevation. The fill materials were compacted using a .
vibratory steel drum roller.
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'No. 2775 P 6
K & A Engineering, Inc..
We tested the in-place density of the 3;\-inch minus dense graded crushed aggregate fill and have determined
that the average dry density exceeds 9S'percent 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 2,000-pounds per square foot '
The soils present a moderate shrink/swell hazard. . Foundation loads should bear on undis1urbed native clay and
decomposed sandstone a minimum depth of 36-inches below final grade around the perimeter foundation. The
prepared foundation pad meets these recommendations,
Finai grading around the foundation pad should raise the grade above the toundation 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,
Client: Hayden Enterprises . JasperMeadowS-lot 245, Springfield. OR
Project: 151,06
Page 2 of ~
September 8. 2008
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No.2775 P 7
Density of Soli and Soli-Aggregates In-Place
ASTM 02922 and 03017
, Project: 151,06 l
Site Address: Jasper Meadows--Lot 245 j
I Permit No:
I Date: 1915/2008 J
I Density Test Type':IDT'4 J
I Operator:ISS I
I Material Type:13/4" (-) from Springfield Quany J
1 Maximum Dry Denslly. pc1l130.0 J
I Standardization and Reference CheCklll. Density I Ill. Moisture, I I
(Standard Deviations) (S.D,) 0.35 (S.D:) . 1.46
Moist Dry
Density. Density, Water Compaction,
Test No, pel pel Conten~ % % Remarks
1 134,7 130.4 3,3 100,3%. I
2 133,9 129,0 I 3,8 99,2% I
3 129,1 124.7 I 3,5 95,9% I
4 134.4 129.7 I 3,6 I 99,8% I
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Average: 98,8%
Std, Dev,: 1.96%
1 Direct Transmission (DT) (specify depth, in,) or Air Gap Backscatter (AGB) (specifiy(T)ouchable or (U)ntouchable
mode
Test performed using Seaman Nuclear Corp model C-300, SN 21113
Client: Hayden Enterprises, Inc, .
Project: 151.06
. K & A Engineering, fnc, "
9/8/2008'