HomeMy WebLinkAboutObservation of Excavation 11.12.2021If
Kum � ni Associates, h�c.-
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
November 12, 2021
Red House Architecture
Attn: Bruce Barth
815 Blake Avenue
Glenwood Springs, Colorado 81601
bruce(d,redhousearchitecture. com
Project No. 21-7-454
Subject: Observation of Excavation, Proposed Residence, Lot 20, Teller Springs,
280 Lariat Lane, Garfield County, Colorado
Dear Bruce:
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on November 10, 2021 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation support are presented in this report. The
services were performed in accordance with our agreement for professional engineering services
to Red House Architecture dated May 13, 2021. We previously performed a subsoil study at this
site dated July 7, 2021, Project No. 21-7-454.
The proposed construction is similar to that discussed in our previous report. The building has
been designed to be supported on spread footings using an allowable soil bearing pressure of
3,000 psf as recommended.
At the time of our visit to the site, the foundation excavation had been cut in 3 levels from 2 to
12 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
typically consisted of dense, slightly silty sandy gravel with cobbles and small boulders. 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 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
Red House Architecture
November 12, 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.
Shane M. Mello, Staff Engineer
Reviewed by:
Dat
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Kumar & Associates, Inc. ® Project No. 21-7-454