HomeMy WebLinkAboutObservation of Excavation 06.25.24K+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 Employee wed Com;mny www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 25, 2024
Red House Architecture
Attn: Bruce Barth
815 Blake Avenue
Glenwood springs, Colorado 81601
bruce&redhousearchitecture.com Project No. 21-7-220.A
Subject: Observation of Excavation, Proposed Residence, Lot 26, Filing 9, Elk Springs,
0129 Kingbird, Garfield County, Colorado
Gentlemen:
As requested by Kurt Kelly, a representative of Kumar & Associates, Inc. observed the
excavation at the subject site on June 24, 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. We previously conducted a subsoil study for design of foundations at
the site and presented our findings in a report dated March 17, 2021, Project No. 21-7-220.
At the time of our visit to the site, the foundation excavation had been cut in one level from
about 4 to 6 feet below the adjacent ground surface and exposed dry, very hard basalt rock below
the topsoil. The bottom of the excavation was irregular grade and we understand that a few
inches of compacted 3/-inch road base is proposed to level the bottom in footing areas.
The basalt exposed in the excavation is consistent with that previously encountered on the site
and covered with a few inches of compacted road base are suitable for support of spread footings
designed for the recommended allowable bearing pressure of 2,500 psf. Loose disturbed
material in the footing areas should be removed and the road base compacted to at least 98% of
standar Proctor density at near optimum moisture content. 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 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 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.
Steven L. Pawlak, P. `n i5222
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