HomeMy WebLinkAboutExcavation Observation 06.11.24
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 11, 2024
Chris Laven
998 County Road 117
Glenwood Springs, Colorado 81601
chris@ICGAspen.com
Project No. 24-7-352
Subject: Observation of Footing Excavations, Proposed Barn, 998 County Road 117,
Garfield County, Colorado
Dear Chris:
As requested, a representative of Kumar & Associates, Inc. observed the footing excavations
at the subject site on June 6, 2024 to evaluate the soils exposed for foundation support. The
findings of our observations and recommendations for the foundation design are presented in
this report. The services were performed in accordance with our agreement for professional
engineering services to you dated June 6, 2024.
The barn will be a one-story wood frame structure with a slab-on-grade floor. The barn structure
will be supported by 8 concrete pad footings. The foundations were designed for an allowable
soil bearing pressure of 2,000 psf. Foundation retaining walls were designed for a lateral earth
load based on an equivalent fluid unit weight of 45 pcf.
At the time of our visit to the site, the foundation pad excavations had been cut in multiple levels
from 2½ to 3½ feet below the adjacent ground surface. The soils exposed in the bottom of the
excavations consisted of stiff, sandy, silty clay. Results of swell-consolidation testing performed
on a sample of the clay taken from the site, shown on Figure 1, indicate the soils have a low to
moderate compressibility potential under conditions of light loading and wetting. No free water
was encountered in the excavation and the soils were slightly moist to moist.
The soil conditions exposed in the excavation are suitable for support of spread footings
designed for the assumed allowable bearing pressure of 2,000 psf. Loose and disturbed soils
should be removed in the footing areas to expose the undisturbed natural soils.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation at the site. Variations in the subsurface conditions below the
excavation could increase the risk of foundation movement. We should be advised of any
variations encountered in the excavation conditions for possible changes to recommendations
contained in this letter. Our services do not include determining the presence, prevention or
possibility of mold or other biological contaminants (MOBC) developing in the future. If the
client is concerned about MOBC, then a professional in this special field of practice should be
consulted.
Kumar & Associates