HomeMy WebLinkAboutObservation of ExcavationKw= & Asseckdes, 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 Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
August 29, 2023
Resort Development Building
Attn: Chance Soldoff
99 Elfin Place
Glenwood Springs, Colorado 81601
soldoff5A,aol.com
Project No. 22-7-699
Subject: Observation of Excavation, Proposed Residence, Lot 56, Filing 9, Elk Springs,
3171 Elk Springs Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on August 24, 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 October 26, 2022, Project No. 22-7-699.
The proposed residence is generally the same as described in our previous report and designed
to be supported on spread footings sized for the recommended allowable bearing pressure of
2,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
2 to 6 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of 3/-inch road base which had been compacted. We understand the road base was
used to level the excavation bottom on top of the basalt rock natural soils. No free water was
encountered in the excavation and the soils were slightly moist to moist.
The natural basalt rock soils covered with a relatively shallow depth of road base should be
suitable for support of spread footings designed for the recommended allowable bearing pressure
of 2,000 psf. Loose disturbed soils should be moistened and compacted in the footing areas.
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.
Resort Development Building
August 29, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & As:
Steven L. Pa
SLP/kac
Kumar & Associates, Inc. 1� ; Project No. 22-7-699