HomeMy WebLinkAboutPermit Field Test & Inspection Report 2008-6-26
Jun. 26. 2008 9:02AM
No.2637 P. 2/13
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t'nglnpering
K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
June 26, 2008
c-q~' qit
Project: 151.06
Hayden Enterprises, Inc.
2464 SW Glacier Drive #110
Redmond, OR 97756
.. Subject:
Springfield Buildiflg Permit COM2008-00804
Jasper Meadows subdivision--Lot 237 - S7lf~
5748 Mineral Way-Springfield, OR
Foundation Soils
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PURPOSE AND SCOPE
At your request, K & A Engineering, Inc. has completed a geotechnical investigation of the existing SOils on the
subject property. Our undefstanding is that a wood-framed single-family residence supported by a cast-In-
place concrete spread footing foundation is Pfoposed for construction on this site.
The purpose of our investigation was to determine the suitability of the soils for construction ot the proposed
structure, and provide recommendations for construction of the foundation. The scope of our selVices 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 northwest corner of the
. Mineral Way/South 57. Place intersection. The lot is mostly level and there are no apparent 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 dafk
brown/black, moist, moderately stiff, organic silt, over gray/orange, wet, moderately stiff, plastic ciay 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. After the excavation and removal of the unsuitable soils, approximately 1.5 to
25-feet of "i<-inchminus dense graded crushed aggregate was placed, graded, and compacted on the
foundation pad. This selVed to provide a uniform surface for 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 'I.-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 lest
results are attached to this report.
Jun.26. 2008 9:02AM
No. 2637 P 3/13
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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,OOO.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 Ifom 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.
EXPIRES
Client: Hayden Enterprises Jasper Meadows-Lot 237, Springfield, OR
Project: 151.06
Page 2 012
June 26, 2008
Jun.26. 2008 9:02AM
No. 2637 P .4/13
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Density of Soil and Soil-Aggregates In-Place
ASTM D2922 and 03017
Project: 151.06
Site Address: Jasper Meadows--Lot 237
Permit No:
Date: 6/25/2008
Density TeslType': OT-6
Operator: 55
Material Type: 3/4' (-) from Springfield Quarry
I Maximum Dry Denstiy, pel 128.0
I Standardization and Reference Check ~ Density I
(Standard Deviations) (S.D.) 0.27
It. Moisture, I
(S.D:)
0.6
Moist' Dry'
Density, Density, Wafer Compaction,
Test No. pcl pel Content, % % Remarks
1 141.0 1334 5.7 104.2%
2 131.9 127.7 3.3 99.8%
3 136.1 132.4 2.8 103.4%
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Average: 102.5%
Sid, Dev.: 2.38%
, Direct Transmission (OT) (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, Inc.
6/26/2008