HomeMy WebLinkAbout2945 Percheron Dr - Special Inspections/Engineering - 11/12/2013�18 o���e�.8022 ��o;o adots
A.G. Wa.ssenaar 5710
303-759-8100 Fax 303-756-2920
Geotechnical and Environmental Consultants �' o www.agwassenaar.com
August 20, 2013
Revised November 12, 2013
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 5, Block 3
Rigden Farm, Filing 17
Fort Collins, Colorado
Project Number 131730
Purpose
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 34'/z feet. The subsurface materials encountered consisted of:
0' to 7' Fill, clay, very stiff, silty, sandy, slightly gravelly, moist, mottled brown
7' to 29' Clay, medium stiff, silty, sandy, slightly calcareous, moist to very moist, brown
29' to 34'/z' Sand and Gravel, very dense, silty, wet, brown
Date of drilling: July 17, 2013
Depth to water: 17 feet at the time of drilling
Destroyed 2 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 (0.5% at a depth of 2 feet and 0.4% at a depth of 7 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 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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