HomeMy WebLinkAboutObservation of Excavation 08.18.2023I(+rtHffi,ffiffi*ifü*-"
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5020 County Roail 154
Glenwood Springs, CO 81ó01
phone: (970) 945-7988
fax: (970) 945-8454
ernail : kaglenwood@kumarusa.com
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Offrce Locations: Denver (HQ), Parlier, Colo¡aclo Springs, Foú Collins, Glenwood Springs, and Summit County, Colorado
August 18,2023
Charlie Ellsworth
P. O. Box 1167
Silt, Colorado 81652
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Project No.23-7-226
Subject:Observation of Excavation, Proposed Steel Building,670 County Road 266,
Garfield County, Colorado
Dear Charlie,
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on August 16,2023 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 May 8, 2023, Project No.23-7-266.
The proposed construction is sirnilar to that discussed in our previous report. The building has
been designed to be supported on spread footings bearing on the natural fine-grained soils sized
using an allowable bearing pressure of 1,500 psf based on recommendation provided in our
report, with some risk of settlement'
At the time of our visit to the site, the foundation excavation had been cut in 2 levels from I to
5 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff, silty sandy clay with scattered gravel and cobbles. Four to six inches of
screened rock had been placed over the natural soils in the slab-on-grade areas. 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 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
Charlie Ellsworth
August 18,2023
Page 2
(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 & Associ lnc.
Mello, Staff Engineer
Reviewed by:
Robert L. Duran, P
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Kumar & Associates, lnc. A Project No.23-7-226