HomeMy WebLinkAbout2426 Copper Crest Ln - Special Inspections/Engineering - 08/15/2013Zq zG O.of6y`r C�fP-5 -L-
A.G.
enaar
Geotechnical and Environmental Consultants
Meritage Homes of Colorado, Inc.
6892 South Yosemite Court, Suite 1-201
Centennial, Colorado 80112
Attention: Mr. Michael Bird
Subject: Soil and Foundation Study
Proposed Residential Structure
Lot 7, Block 12
Kechter Crossing
Fort Collins, Colorado
Project Number 130421
Purpose
2180 South Ivanhoe Street, Suite 5
Denver, Colorado 80222-5710
303-759-8100 Fax 303-756-2920
www.agwassenaar.com
August 15, 2013
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As requested, we have performed a soil and foundation study at the subject site. The purpose of our
study was to observe subsurface conditions encountered and to recommend geotechnical design
criteria for the design and construction of the foundation for the proposed residence. This letter
presents a summary of our findings and recommendations.
Subsurface Conditions
The field exploration included drilling a 4-inch diameter auger boring near the center of the lot to a
depth of approximately 20 feet. The subsurface materials encountered consisted of:
0' to 7' Fill, clay, medium stiff, silty, sandy, moist, mottled brown
7' to 20' Clay, stiff, silty, very sandy, moist to wet, brown to rust brown to olive brown
Date of drilling: June 27, 2013
Depth to water: 18 feet at the time of drilling
16 feet 5 days after drilling
Laboratory Testing
Samples obtained during drilling were returned to the laboratory. They were visually classified and
testing was assigned to selected samples in an effort to evaluate the engineering properties of the
subsurface materials encountered. Site specific laboratory swell/consolidation tests exhibited low
measured swell (0.1% at a depth of 7 feet and 0.7% at a depth of 14 feet) upon an increase in
moisture content under a load of 1,000 pounds per square foot (psf). Based upon visual observation
of the subsurface conditions encountered and laboratory testing for this and/or adjacent lots, it is our
opinion that the subsurface materials generally exhibit low to moderate potential for expansion. Refer
to the Colorado Geological Survey Special Publication 43 for a description of expansive soils and
their impact on structure performance.
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