HomeMy WebLinkAboutPermit Field Test & Inspection Report 2007-3-9
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V . f1 " ./ 3327 Roanoke Ave., Eugene, OR 97408
1/l v\, (541) 684-9399 Voice
(\ -; (541) 684-9358 FAX
engineering
March 9, 2007 '
Project: 151.06
Hayden Enterprises, Inc.
2464 SW Glacier Drive #110
Redmond, OR 97756
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Subject: Jasper Meadows subdivision--Lot 221
Springfield, OR
Foundation Soils~
PURPOSE AND SCOPE
.. At your request, K & A Engineering, Inc. has compl&ted 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 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 east side of 58" SI. in the new "Jasper Meadows"
subdivision. The lot is mostly ievel and there are no apparent slope movement hazards.
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Based on the foundation pad excavation, soils consist of approximately 12-inches of dark brown, loose, organic
silts and silty fills, over 17 -inches of gray, saturated, plastic silts, over saturated, tan, moderately stiff,
weathered and decomposedsandstone.
Foundation preparation involved constructing a levei foundation pad on native undisturbed~oils. The grade
requirements dictated that approximately 36-inches of loose silts, fills, plastic silts, and decomposed sandstone
be stripped and removed from the foundation pad area. Alter the excavation and removal of these soils,
approximately 10 to 18-inches of %'inch minus dense graded crushed aggregate was placed and compacted. ~
This served to provide a uniform surface for footing construction. The fill materials were placed in maximum
lilts 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 tested the in-place density of the crushed aggrygate fill and have determined that the average dry density
exceeds 95% of maximum as aetermined by ASTM 0698. The fieid test results are attached to this report.
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SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to support the proposed foundations. We recommend~a design
allowable bearing capacity of 2,5DD-pounds per square foot
The soils present a moderate shrink/swell hazard, Foundation loads should bear on undisturbed native silts a
minimum depth of 3D-inches below final grade around the perimeter foundation. The prepared foundation pad
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 fhe building official.
Thank you for the opportunity to be of service. Plea.se call us if you have questions or need further assistance.
Respectfully,
Steve Schultz, En,
K & A Engineering, Inc.
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EXPIRES DEI.: ';'\ 0 ~~~m
, Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers.
Client: Hayden Enterprises Jasper Meadows-Lot 221, Springfield, OR
Project: 151.06
Page 2 of 2
March 9, 2007
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Density of Soil and Soil-Aggregates In-Place
ASTM 02922 and 03017
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I Maximum Dry Denstiy, pcf 128.0
I Standardization and Reference Check L'. Density I.
(Standard Deviations) (S,D.)
Project: 151.06
Site Address: Jasper Meadows--Lot 221
Permit No:
Date: 3/9/2007
Density Test Type': DT-6
Operator: SS
Material Type:. 3/4" (-) from Springfield Quarry
0.34
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Test No.
1
2
3
Moist
Density,
pel
128.1
139.3
136,6
Dry
Den.sity,
pel
118.3
127:7
128.9
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Water: Compaction,
Content, % %
8.2 92.4%
9.1 99.8%
6.0 100,7%
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Average: 97.6%
Std. Dev.: 4.53%
1 L'. Moisture, I
(S.D:)
Remarks
1.12
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1 Direct Transmission (DT) (specity 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, Inc.
11/19/2007