HomeMy WebLinkAboutPermit Geo-Tech Report 2008-2-15
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(541) 684-9399 Voice
. (541) 684-9358 FAX
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February 15, 2008
Douglas Larson
1830 Friendly SI.
Eugene, DR 97402
Project: 32.08
Subject:. Springfield Building Permit Number: LDP2008.00006
2595 16th SI.
Springfield, OR
Foundation Soils
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PURPOSE AND SCOPE
At your request, K & A Engineering, Inc. ha~ completed a geotechnical investigation of the existing soiis 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 CONSTRUCTION
The project site is located on a residential lot in a new subdivision on the east side of 16th Street in Springfield,
Oregon, The lot is mostly level and shows no signs of drainage or slope movement hazards,
Based on a test pit excavated on the wesi side of thefoundation pad, soils consist of approximately 5 to 8-
inches of dark brown, moist, loose, organiC silt, over tan, moist, moderately stiff to stiff, moderately plastic,
sandy silt.
Foundation pad preparation involved constructing a level foundation pad below the footing elevation on suitable
native undisturbed soils, This required stripping and removing approximately 6 to 18-inches of loose organic.
silt and sandy silt in the foundation pad area. After the excavation and removal of unsuitable soils and soils
required to achieve the desired elevation, approximately 2 to 4-inches of 'I.-inch minus dense graded crushed
aggregate was placed on the foundation pad to provide a uniform surface for footing construction,
The limited depth of the dense graded crushed aggregate did not warrant any in:place density tests.
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RECOMMENOATIONS
General Suitability
The site is suitable for construction of the proposed, foundation, There are no significant geologic or other.
hazards, We recommend acceptance of the foundation pad, as constructed, by the local building official.
Foundation Support
Undisturbed foundation soils at this site will provide an allowable bearing capacity of 1 ,500 pounds per square
foot Conventional cast-in-place concrete spread and strip footings may be used for foundations,
Expansive Soils
The soils present a moderate shrink/swell hazard, Foundation loads should bear on undisturbed native silts a
minimum depth of 24-inches below final grade around the perimeter foundation, The prepared foundation pad
meets these requirements.
LIMITATIONS OF THIS REPORT
This report has been prepared lor the exclusive use of Douglas Larson and his design consultants for the
subject proposed structure, '
This geotechnical investigation, analysis, and recommendations meet the standards of care of competent
geotechnical engineers providing similar services at the time these services were provided, We do not warrant
or guarantee these recommendations, site surtace, or subsurtace conditions,
Thank you for the opportunity to be of service, Please call us if you have questions or need further assistance,
Respectfully,
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Steve Schultz, ELT.
K & A Engineering, Inc,
EXPIRES
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Project: 32,08
Client: Douglas Larson
2595 16th Street-Springfield, OR
Page 2 of 2
February 15, 2008