HomeMy WebLinkAboutObservation of Excavation 10.26.2023K+AKumar & Associates, Inc.
Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Ernployee Owned Compony www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
October 26, 2023
Compass Construction Management
Attn: Scott Dewind
P.O. Box 78
Basalt, Colorado 81621
Scott(ci)compasscm.com
Project No. 23-7-618
Subject: Excavation Observation, Proposed Metal Building, 6283 County Road 100,
Garfield County, Colorado
Dear Scott:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on October 26, 2023 to evaluate the soils exposed for foundation support. The
findings of our observations and recommendations for the foundation design are presented in
this report.
At the time of our visit to the site, the foundation excavation had been cut to one level from
about 1 %2 to about 3'h feet below the adjacent ground surface. The soils exposed in the
excavation consisted of a medium stiff to stiff sandy silty clay in the southwest and northeast
portions of the excavation and basalt cobbles in a white calcareous sandy silty matrix in the
southeast and northwest portions of the excavation. In some of the clay areas, probing indicated
that the cobbles were less than about 1 foot below footing grade. There were two individual pad
excavations on the west side of the building area. No free water was encountered in the
excavation and the soils were dry to slightly moist.
The soil conditions exposed in the excavation are suitable for support of spread footings
designed for an allowable bearing pressure of 1,500 psf on the undisturbed natural soils. Any
loose and disturbed soils should be removed in the footing areas to expose the undisturbed
natural soils prior to the placement of concrete. Other recommendations presented in our
previous report which are applicable should also be observed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and our experience in the area. 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.
Compass Construction Management
October 26, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
David Noteboom, Staff Engineer
Reviewed by:
Daniel E. Hardin,
DEH/kac
Kumar & Associates, Inc. Project No. 23-7-618
