HomeMy WebLinkAboutPermit Field Test & Inspection Report 2008-6-26
Jun.26. 2008 9:03AM
No.2637 P 8/13
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engineer,ing
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K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
June 26, 2008
Project: 151.06
Hayden Enterprises, Inc.
2464 sw Glacier Drive #110
Redmond, OR 97756
Subject: Jasper Meadows subdlvision--Lot 239 - 57\C. MM~~'
5716 Mineral Way-Springfield, OR
Foundation Soils
G. ~-1ir
PURPOSE AND SCOPE
At your request, K & A Engifleering, 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 investigaUOn 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 Jasper Meadows subdivision in the northeast corner of the
Mineral Way/South 57" Street intersection. The lot is mostly level and there are no appafent slope movement
hazards, The original ground surface is low lying and is poorly drained.
Based on the foundation pad excavation, native soils consist of approximately 8 to 16-inches of dark
brown/black, moist, moderately stiff, organic silt, over gray/orange, wet, moderately stiff, plastic clay mixed
with decomposed sandstone.
Foundation preparation involved constructing a level foundation pad on a subgrade consisting of native
undisturbed soils. This required excavating and removing approximately 8 to 16-inches of dark brown organic
silt from the foundation pad area. Aftef the excavation and removal of the unsuitable soils, approximately 1.5 to
2.5-feet of 'I.-inch minus dense graded crushed aggregate was placed, graded, and compacted on the
foundation pad. This served to provide a unifofm surface fOf footing construction at the desired elevation. The
fill materials were placed and then compacted using a vibratory steel drum roller.
We tested the in-place density of the 'Y<-inch minus dense graded crushed aggregate fill and have determined
that the average dry density exceeds 95-percent of maximum as determined by ASTM 0698. The field test
results are attached to this feport.
Jun: 26 2008 9 03AM
No. 2637 P. 9/13
K & A Engineering, Inc.
SUMMARY AND RECOMMENDATIONS
The project site, as prepared, is suitable to support the proposed foundations. We recommend a design
allowable beartng capacity of 2,000-pounds per square foot.
The soils present a moderate shrtnk/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 foufldation 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.
Steve Schultz, E.I.T.
K & A Engineering, Inc.
Client: Hayden Enterprises Jasper Meadows-Lot 239, Springfield, OR
Project: 151.06
Page 2 of 2
June 26, 2008
Jun.26. 2008 9:03AM
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Density 01 Soil and Soil-Aggregates In-Place
ASTM D2922 and D3D17
Proiect 151.06
Site Address: Jasper MeadowsnLot 239
Permit No:
Date: 6/25/2008
Density Test Ty~e': DT-6
Operator: 55
Material Type: 3/4' (-1 from Springfield Quarry
, Maximum Dry Denstiy, pcl 128.0
I Standardization and Reference Check ~ Density I
(Standard Devlatlnns) (S.D.) 0.27
JA Moisture, I
(S.D:)
Moist' Drr'
Density, Density, Water Cnmpaction,
Test NO. pel pc'; Content, % % Remarks
1 140.2 134.7 4.1 105.2%
2 144.0 136.8 5.3 106.8%
3 141.5 135.3 4.6 105.7%
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Average: 105.9%
Std. Dev.: 0.83%
No. 2637 P. 10/13
0.6
I Direct Transmission (DT) (specify depth, in.) or Air Gap Backscatter (AGB) {specifiy(T)ouchable or (U)ntouchable
mode
Test perlormed using Seaman Nuclear Corp model C-300, SN 21113
Client: Hayden Enterprises, Inc.
Project: 151.06.
K & A Engineering, Inc.
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6/26/2008