HomeMy WebLinkAboutPermit Geo-Tech Report 2007-5-15
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K & A Engineering, Ine,
. 3327 Roanoke Ave" Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
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May 15,.2007
Project: 151.06
Hayden Enterprises, Inc.
2464 SW Glacier Drive #.110
Redmond, OR 97756 '
Subject: Jasper Meadows subdivision--Lot 200
Springfield, OR
Foundation Soils.
PURPOSE AND SCOPE
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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 ~esidence supported by a cast-in-
place concrete spread tooting 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 the east side' of 57'h SI. on a resiaentiallot in the new "Jasper Meadows"
subdivision, The lot is mostly/evel and there are no apparent slope movement hazards,
Foundation preparation involved constructing a level foundation pad on native undisturbed soils, This required
excavating and removing approximately 2:5 to 3.5-feet of loose organic silt, plastic silt, and decomposing
organic siit from the foundation pad area. After the excavation and removal of these soils, approximately 12-
inches of %-inch minus dense graded crushed aggregate was placed and compacted over S-inch minus "pit
run" fill. This served to provide a uniform surface for footing construction, The fill materials were placed in
maximum lifts of 12-inches and compacted using a vibratory steel drum roller, K & A Engineering inspected the
excavated foundation pad prior to the placement of fills,
We tested the in-place density of the crushed aggregate fill,andhaiie determined' that the average dry density
exceeds 95% of maxi~um as,determ.ined by ASTM D69S. The field)est result~ are aftached to this report
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SUMMARY AND RECOMMENDATIONS-,
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The project site, as prepared, is suitable to support the proposed foundations,
allowable bearing capacity of 2,5QO-pounds per square foot
We recomrpend a design
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K & A Engineering, Inc.
The soils present a moderate shrink/swell hazard, Foundaiion loads should bear on undisturbed native silts a
minimum depth of 36-inches below final grade around the perimeter foundation, The prepared foundation pad
meets these recommendations,
Final grading around the foundation pad should raise the grade above the foundation uSing native or imported
silts and should slope away trom 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, En.
K & A Engineering, Inc,
19474
EXPIRES DEe' 3 0 200B
. Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers, .
Client: Hayden Enterprises Jasper Meadows-Lot 200, Springfield, OR
Project: 151,06
Page 2 of 2
May 15, 2007
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Density of .Soil and Soil-Aggregates In-Place
ASTM 02922 and 03017
I Project: 151.06
I Site Address: Jasper Meadows--Lot 200
I 'Permit No-:
I Date: 5/9/2007
I Density Test Type': DT-4,6
I Operator: SS
I Material Type: 3/4" (-) from Springfield Quarry
I Maximum Dry Denstiy, pet 128.0
I Standardization and Reference Cheek" Density I
(Standard Deviations)I(S.D,) 1.71
I" MO. isture, I
(S.D:)
Moist Dry
Density, Density, ;' Water Compaction,
Test No, pcl pel Content, % % Remarks
1 134,8 125,5 7,4 98,1%
2 132,9 122,0 8,9 95,3%
3 . 126,1 116,4 8.3 91.0% .
4 129.9 122.4 . 6.1 95,6%
Average: 95.0%
Std. Dev,: 2,95%
1.53
1 Direcf Transmission (DT) (specify depth, in.) or Air Gap Backscatter (AGS) (specifiy(T)ouchable or (U)ntouchable
mode
Test performed using Seaman Nu.clear Corp model C-300, SN 21113
Client: Hayden Enterprises, Inc,
Project: 151.06
K& A Engineering, Inc,
11/19/2007