HomeMy WebLinkAboutPermit Geo-Tech Report 2007-5-15
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K & A Engineering, Inc,
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
E'nginE'E'ring
May 15, 2007
Project: 151.06
Hayden Enterprises, Inc,
2464 SW Glacier Drive #110
Redmond, OR 97756
Subject: Jasper Meadows subdivision--Lot 212
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,
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 in the new "Jasper Meadows" subdivision, The lot is mostly level
and there are no apparent siope movement hazards,
Foundation preparation involved constructing a level foundation pad on native undisturbed soils, This required
excavating and removing approximately 12 to 24-inches of loose organic silt and undocumented fill 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 3.0 to 5,0-feet of 8-inch minus "pit run" fill.
This served to provide a uniform surtace for footing construction, The fill materials were placed and then
compacted using a vibratory steel drum roller.
We tested the in-place density of the crushed aggregate fill and have determined that the average dry density
exceeds 95% of maximum as determined by ASTM 0698. The field test resuns are attached to this report.
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K & A Engineering, Inc.
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 shrink/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 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 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, .
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K & A Engineering, Inc.
EXPIRES
DEe' 3 0 2008
. Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers.
Client: Hayden Enterprises Jasper Meadows-Lot 212, Springfield, OR
Project: 151.06
Page 2 of 2
June 21, 2007
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Density of Soil and Soil-Aggregates In-Place
ASTM 02922 and 03017
. Project: /151 ,06
Site Address: Jasper Meadows--Lot 212
Permit No: I
Date: 15/16/2007
Density Test Type':IDT-6
Dperator:I,sS
Material Type:13/4" (,) from Springfield Quarry
I Maximum Dry Denstiy, pcf1128,0
I Standardization and Reference Check/A Density / IA Moisture, I
(Standard Deviations) (S,D,) 1.65 (S.D:) 1.49
Moist' Dry'
Density, Density, Water Compaction,
Test No. pel pel Content, % % Remarks
I 1 137,6 I 129.3 I 6.4 I 101,0% I
I 2 139,8 I 129,8' I 7.7 I 101.4% I
I 3 136,7 I 130.3 I 4.9 I 101.8% I
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Average: 101.4%
Std, Dev.: 0.39%
, Direct Transmission (DT) (specify depth, in,) Dr Air Gap Backscatter (AGB) (specifiy(T)ouchable or (U)ntouchable
. mode
Test performed using Seaman Nuclear Corp modei C-300, SN 21113
Client: Hayden Enterprises, Inc,
Project: 151,06
K & A Engineering, Inc,
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11/19/2007