HomeMy WebLinkAboutPermit Field Test & Inspection Report 2007-8-20
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K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 97408
(541) 684-9399 Voice
(541) 684-9358 FAX
engineering
August 20, 2007 '
Project: 151.06
Hayden Enterprises, Inc
2464 SW Glacier Drive #110
Redmond, OR 97756
Subject Jasper Meadows subdlvlslon--Lot 261 - 57 ~5 - fV/V\,'c.r. c- B' - $73
Springfield, OR
Foundation SOils
PURPOSE AND SCOPE
At your request, K & A Engmeering, Inc has completed a geotechnical mvestlgatlon of the eXlstmg sOils on the
subject property Our understanding is that a wood-framed single-family residence supported by a cast-ln-
place concrete spread footing foundatIOn is proposed for construction on this site
The purpose of our mvestlgatlOn 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 m the new "Jasper Meadows" subdivision The lot IS mostly level
and there are no apparent slope movement hazards.
Foundation preparation mvolved constructmg a level foundation pad on native undisturbed sOils ThiS required
excavatmg and removing unsUitable SOils from the foundation pad area After the excavation and removal of
these SOils, approximately 1 O-foot of %-mch minus dense graded crushed aggregate was placed and
compacted over 8-inch mmus "Pit run" fill The "pit run" typically consisted of a dense graded crushed gravely
Silt With cobbles up to 8-inches This served to provide a Uniform surface for footmg construction, The fill
matenals were placed and then compacted using a Vibratory steel drum roller
We tested the m-place denSity of the crushed aggregate fill and have determmed that the average dry denSity
exceeds 95% of maximum as determined by ASTM 0698, The field test results are attached to thiS report
...
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 gradmg around the foundation pad should raise the grade above the foundation usmg 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,
Steve Schultz, E I T
K & A Engmeering, Inc
EXPIRES
DEC' 30 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 261, Springfield, OR
Project' 151 06
Page 2 of 2
August 20, 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 261
I Permit No: I
I Date: i 8/16/2007
I DensIty Test Type1:jDT-4,6
I Operator: j SS
I Material Type:j3/4" (-) from Springfield Quarry
I Maximum Dry Denstiy, pctj 1280
Standardization and Reterence Check' A Density
(Standard Deviations) (S.D.) 0 89
'A Moisture, .
(S.D:)
1.76
Moist Dry
Density, Density, Water Compaction,
Test No. pet pet Content, % % Remarks
1 128,3 1204 I 66 940%
2 129,2 1227 I 53 959%
3 129.7 1232 I 53 962%
4 131 2 1246 .1 53 973%
I
I
I
I
I
I
Average 959%
Std Dev 1 38%
1 Direct TransmIssion (DT) (specify depth, In ) or Air Gap Backscatter (AGB) (speclfly(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