HomeMy WebLinkAboutPermit Field Test & Inspection Report 2007-3-9
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K & A Engineering, Inc.
3327 Roanoke Ave., Eugene, OR 9740B
(541) 6B4-9399 Voice
(541) 6B4-935BFAX
E'nginE'E'ring
March 9, 2007
Project: 151.06
Hayden Enterprises, Inc,
2464 SW Glacier Drive #110
Redmond, OR 97756
Subject: , Jasper Meadows subdivision,-Lot 220
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 on the east side of 58th SI. in the new "Jasper Meadows"
subdivision, The lot is mostly level and there are no apparent slope movement hazards.
Based on the foundation pad excavation, soils consist of approximately 18-inches of dark brown, loose, organic
silts and silty fills, over 10-inches of gray, saturated, plastic silts, over saturated, tan, moderately stiff,
weathered and decomposed sandstone,
Foundation preparation involved constructing a level foundation pad on native undisturbed soils, The grade
requirements dictated that approximately 36,inches of loose'silts, fills, plastic silts, and decomposed sandstone
be stripped and removed from the foundation pad area, After the excavation and removal of these soils,
approximately 10 to 18,inches of 3;4-inch minus dense graded crushed aggregate was placed and compacted,
This served to provide it'uniform surface for footing construction, The fill materials were placed in maximum
lifts of 12,inches and compacted using a vibratory steel drum roller. We inspected the foundation pad '
excavation, prior to placement of the granular fills,
We tested the in, place density of the crushed aggregate fill and have deiermined 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/sweli hazard, Foundation loads should bear on undisturbed native silts a
minimum depth of 30-inches below final grade around the perimeter foundation, The prepared foundation pad
meets these requirements,
Final grading around the foundation pad shouid raise the grade above the foundation using native or imported
silts and should slope away from the foundation.
We recommend approval 01 the loundation 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,
Respectfuliy,
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Steve Schultz, E.I.~
K & A Engineering, Inc,
EXPIRES IDEe' 3 0 200~
. Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers,
Client: Hayden Enterprises ' Jasper Meadows-Lot 220, Springfieid, OR
Project: 151,06
, Page 2 of 2
March g, 2007
Density of Soil and Soil-Aggregates In-Place
ASTM 02922 and 03017
Project: 151,06
Site Address: Jasper MeadowsnLot 220
Permit No:
Date: 3/9/2007
Density Test Type ': DT-6
Operator: SS
Material Type: 3/4" (-) from Springfield Quarry
I Maximum Dry Denstiy, pCf128,O
I Standardization and Reference Check A Density
(Standard Deviations) (S,D,) 0,34
I A Moisture, I
(S,D:)
1,12
Moist Dry
Density, Density, Water Compaction,
Test No, pcf pcf Content, % % Remarks
1 134,5 122,6 9.7 95,8%
2 143,2 131,5 8,9 102,7%
3 129.4 121.1 6,9 94,6%
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Average: 97,7%
Std, Dev,: 4,39%
1 Direct Transmission (DT) (specify depth, in:) or Air Gap Backscatter (AGB) (specifiy(T)ouchable or (U)ntouchable
mode
Test pertormed using Seaman Nuclear Corp model C,300, SN 21113
Client: Hayden Enterprises, Inc,
Project 151,06
K & A Engineering, Inc.
11/19/2007