HomeMy WebLinkAboutObservation of Excavation 12.01.25Kumar & Associates, Inc.® 5020 County Road 154
K
+A Geotechnical and Materials Engineers Glenwood Springs, CO 81601
and Environmental Scientists phone: (970) 945-7988
email: kaglenwood@kumarusa.com
www.kumarusa.com
An Employee la1M ed Compony
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
December 1, 2025
Western Slope Builders
Attn: Taylor Parsons
6873 Highway 82
Glenwood Springs, Colorado 81601
taylor(cDwesternslopebuilders.com
Project No. 21-7-608.A
Subject: Observation of Excavation, Proposed Residence, Lot 31, Filing 5, Los Amigos
Ranch, 587 Elk Springs Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on November 28, 2025 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 August 31, 2021, Project No. 21-7-608. The current
observation was performed in accordance with our agreement for professional services with
Western Slope Builders dated November 4, 2025.
The proposed residence has been designed to be supported on spread footings sized for the
recommended allowable bearing pressure of 2,500 psf.
At the time of our visit to the site, the excavation for the residence had been cut in 2 levels from
about 4 to 12 feet below the adjacent ground surface with a step of about 2 feet between levels
near the downhill south side. The soils exposed in the bottom of the excavation consisted of
basalt cobbles and boulders in a calcareous sand silt matrix. CDOT Class 6 road base of
around 1 to 2 feet deep had been placed and compacted to develop the design bearing levels.
The garage area had been rough cut into the basalt rock soils. No free water was encountered
in the excavation and the soils were slightly moist.
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 2,500 psf. Loose disturbed soils (such as in the garage area) should be
removed as much as practical and base course placed and compacted to at least 95% of
standard Proctor density at near optimum moisture content. The bearing soils should be
protected from frost and concrete should not be placed on frozen soils. 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
Western Slope Builders
December 1, 2025
Project No. 21-7-608.A
Page 2
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,
Steven L. Pawlak,
SLP/kac
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