HomeMy WebLinkAboutObservation of Excavation 06.19.230
is -An Kuniar & 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 Employee Owned Company www.kumarusa.com
Office Locations: Denver (11% Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 19, 2023
David Gatlin
7004 County Road 312
New Castle, Colorado 81647
dave2 ag tlin(cr�,yahoo.com
Project No. 18-7-520.A
Subject: Observation of Excavation, Proposed Shop Building, 7004 County Road 312,
Garfield County, Colorado
Dear Dave:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 15, 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.
We previously conducted a subsoil study for design of foundations for a residence at this site and
presented our findings in a report dated August 31, 2018, Project No. 18-7-520. The current
observation was performed in accordance with our agreement for professional services to you
dated June 13, 2023.
The proposed shop will be a 30 feet by 50 feet, one-story, steel frame structure with a slab -on -
grade floor located about 60 feet east of the existing house. Foundations consist of two -foot
wide -spread footings designed for an allowable soil bearing pressure of 1,500 psf.
At the time of our visit to the site, the perimeter footing excavation had been cut in one level
from 11/2 to 2%2 feet below the adjacent ground surface which appeared to be about 5 feet below
the original ground surface. The soils exposed in the bottom of the excavation consisted of
brown, medium stiff, slightly sandy silt and clay. No free water was encountered in the
excavation and the exposed soils were moist due to recent rain.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and suitable for support of spread footings designed for an allowable bearing pressure
of 1,500 psf. 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 the previous limited subsurface exploration 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
David Gatlin
June 19, 2023
Page 2
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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
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Kumar & Associates, Inc. Project No.18-7-520.A