HomeMy WebLinkAboutObservation of Excavation 11.24.20211(+AGeotedmical 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 Entp{oyOO OWMd COMPany www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
November 24, 2021
SGJD, LLC
Attn: Jim Detterick
4894 Meadow Lane
Vail, Colorado 81657
(j im. detterick(a,mac. com)
Project No. 21-7-291
Subject: Observation of Excavation, Proposed House, Buck Point Ranch, 723 County
Road 121, Garfield County, Colorado
Dear Jim:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on November 24, 2021 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 24, 2021, Project No. 21-7-291.
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
about 3 to 10 feet below the adjacent ground surface. The soils exposed in all levels in the of the
excavation consisted of a dense, clayey sandy gravel. Footing areas of the excavation were
covered by frost protection blankets under which was a layer of compacted road base over the
native sandy clayey gravel. No free water was encountered in the excavation and the soils were
moist to very 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 an allowable bearing pressure
of 2,000 psf on the natural granular soils. Any loose and disturbed soils should be removed in
the footing areas to expose the undisturbed natural soils prior to the placement of concrete. The
bearing soils should be protected against 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
SGJD, LLC
November 24, 2021
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 & Associates, Inc.
David Noteboom, Staff Engineer
Reviewed by:
Da
WC
Kumar & Associates, Inc. 0 Project No. 21-7-291