HomeMy WebLinkAboutObservation of ExcavationKumar A Assoefates, Inc.
'( 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 Owner! Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
August 1, 2023
Brandon Cowhey
571 Riverbend Way
Glenwood Springs, Colorado 81601
cowheybrandon@ gmail. com
Project No. 22-7-115
Subject: Observation of Excavation, Proposed Garage and Root Cellar, 9174 Highway 82,
Garfield County, Colorado
Dear Brandon:
As requested, the undersigned representative of Kumar & Associates, Inc. observed the
excavation at the subject site on July 31, 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 February 11, 2022, Project No. 22-7-115.
The proposed garage and root cellar are one-story wood frame structures which are set into the
hillside on the east side and will walk out to the west. Foundations were designed for 3,000 psf
allowable soil bearing pressure.
At the time of our visit to the site, the foundation excavation for the two adjacent structures had
been cut in two levels from 2%2 to 11 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 scattered small boulders. No free water was encountered in the excavations 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 3,000 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 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 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.
Brandon Cowhey
August 1, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, I
F-
Daniel E. HardirVA. ill /;?-,7
DEH/kac
cc: Wes Gardner
Kumar & Associates, Inc. ® Project No. 22-7-115