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 #11 Q
Redmond, OR 97756
Co."
p~""" ,tl:' 5" 7tt
Subject Jasper Meadows subdivlslon--Lot 260 )773
Springfield, OR
Foundation Salls
PURPOSE AND SCOPE
At your request, K & A Engineering, Inc has completed a geotechnical investigation of the eXisting salls on the
subject property" Our understanding IS that a wood-framed single-family residence supported by a cast-In-
place co~crete 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 proposea-
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 slope movement hazards.
Foundation preparation Involved constructing a level foundation pad on native undisturbed salls This reqUired
excavating and removing approximately 12 to 36-inches of loose organic silt and decomposing organic Silty fill
from the foundation pad area After the excavation and removal of these sOils, approxImately 12-lnches of 3;4-
Inch minus dense graded crushed aggregate was placed and compacted over 8-lnch minus "pit run" The "pit
run" tYPically conSisted of a dense graded crushed gravely Silt with cobbles up to 8-lnches ThiS served to
provide a uniform surface for footing construction, The fill materials wer~ placed in maximum lifts of 12-lnches
and 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 results are attached to thiS report.
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SUMMARY AND RECOMMENDATIONS
The project Site, as prepared, IS SUitable to support the proposed foundations We recommend a deSign
allowable bearing capacity of 2,50Q-pounds per square foot.
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K & A Engineering, Inc.
The sOils present a moderate shrink/swell hazard Foundation loads should bear on undisturbed native silts a
minimum depth of 36-mches below fmal grade around the perimeter foundation The prepared foundation pad
meets these requirements
Fmal 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 Engineering, Inc
EXPIRES DEe' 3 0 2008
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. Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers
Client Hayden Enterprises Jasper Meadows-Lot 260, 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
Project: 151 06
Site Address: Jasper Meadows--Lot 260
Permit No:
Date: 8/16/2007
Density Test Type1: DT-4,6
Operator: I 55
Material Type:13/4" (-) from Spnngfleld Quarry
I Maximum Dry Denstiy, pCfl128,O
Standardization and Reference Check ~ Density
(Standard Deviations) (S.D ) 089
~ Moisture,
(S.D:)
1 76
Moist Dry
Density, Density, Water Compaction,
Test No. pcf pcf Content, % % Remarks
1 1308 1230 63 961%
2 1298 121 6 67 950%
3 130,3 122,1 67 I 95.4%
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Average 955%
Std Dev 056%
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 Enterpnses, Inc
Project. 151 06
K & A Engmeenng, Inc.
11/19/2007