HomeMy WebLinkAboutObservation of Excavation 03.14.20241(+A Kumar &Associates, lac.®
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 OwnW Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
March 14, 2024
Wes Gardner
P.O. Box 1628
Carbondale, Colorado 81623
wes. arg dner(&bridgenetworkcolorado.com
Project No. 22-7-115.A
Subject: Observation of Excavation, Proposed Residence, 9171 Highway 82, Garfield
County, Colorado
Dear Wes:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 14, 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 February 11, 2022, Project No. 22-7-115.
At the time of our visit to the site, the foundation excavation had been cut in one main level
from 12 to 15 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of relatively dense, slightly silty sandy gravel with cobbles and small
boulders. No free water was encountered in the excavation and the soils were slightly moist
to 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 3,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. 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 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. ORE
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Daniel E. Hardin, P.E. .• 3 �� s/;L
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