HomeMy WebLinkAboutObservation of Excavation 07.15.2020Kumar & Asmintes, Inc. "I
1(+A 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 Chemed Company www.kumarasa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
July 15, 2020
Uriel Mellin
144 Cliffrose Way
Glenwood Springs, Colorado 81601
uriel.mellinAhotmail.com Project No. 18-7-635
Subject: Observation of Excavation, Proposed Residence, Lot 23, Callicotte Ranch,
Callicotte Ranch Drive, Garfield County, Colorado
Dear Uriel:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 30, 2020 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 November 13, 2018, Project No. 18-7-635.
At the time of our visit to the site, the foundation excavation had been cut in two levels from 2 to
6 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff silty sandy clay in the northern portion of the excavation and basalt rocks in a
sandy silt matrix in the southern portion. 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 1,500 psf. Loose and disturbed soils should be moistened and compacted or
removed in the footing areas to expose the undisturbed natural 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 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.
OR
Daniel E. Hardin, P.E. _ °•
Rev. by: SLP
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cc: Patrick Stuckey (stucarc SLAIC i