HomeMy WebLinkAboutObservation of ExcavationD.
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Kumar nj Alates, s En 5020 County Road 154
Geotechnical and and MaterialsEngineers Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945 7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Employee Owned Company www.kumarusa c m
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
July 19, 2024
Smith Mountain Builders
Attn: Eric Mason
1011 Heritage Drive
Carbondale, Colorado 81623
smithmou ainbuildersAwnaii.coin
Project No. 20-7-537.A
Subject: Observation of Excavation, Proposed Residence, 1515 Elk Springs Drive, Lot 73,
Los Amigos Filing 7, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on July 15, 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 October 26, 2020, Project No. 20-7-537. The observations were
performed in accordance with our agreement for geotechnical engineering services to Smith
Mountain Builders dated July 11, 2024.
At the time of our initial visit to the site, the basement level was being excavated. We visited
the site four days later and observed the excavation had been completed. The foundation
excavation had been cut in multiple levels from 4 to 10 feet below the adjacent ground surface.
The soils exposed in the bottom of the excavation consisted of basalt rocks in a calcareous matrix
in the deeper portions of the excavation and sandy silty clay soil in the shallower parts of the
excavation. No free water was encountered in the excavation and the soils were slightly moist
to moist. Some loose soil was observed in the lower, basement area of the excavation. This
material should be removed below footing areas or moistened and compacted if below slab areas.
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 the recommended allowable
bearing pressure of 2,000 psf. Some loose and disturbed soils were observed in the southern
basement area. The loose soils should be removed from below footing areas to expose the
undisturbed natural soils. In below -slab areas, the loose soils can be removed or moistened
and compacted. 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
SmithMountain Builders
July 19, 2024
Page 2
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, IX -
Daniel
E. Hardin, I
Rev. by: SLP
DEH/kac
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Kumar & Associates, Inc. 0 Project No. 20-7-537.A