HomeMy WebLinkAboutObservation of Excavation 04.07.2023rcrt
An Employcc Oçncd Conrpony
5020 County Road 154
Glenwood Springs, CO 8ló01
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
www.kumarusa.com
Office l¡cations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
Apn17,2023
Sam Ruiz
P. O. Box 456
Silt, Colorado 81652
nce@q.com
Project No. 20-7-555.01
Subject: Observation of Excavation, Proposed Residence, Lot 3, Ruiz South Minor
Subdivision, County Road 346, Garfield County, Colorado
Dear Sam:
As requested, a representative of Kumar & Associates observsd the excavation at the subject site
on April 7,2023 to evaluate the materials exposed for foundation support. The findings of our
observations and recommendations are presented in this report. The services are supplemental to
our agreement for professional services to you dated September 25,2020.
We previously conducted a subsoil study for design of foundations at the site and presented our
findings in a report dated November 20,2020, Project No. 20-7-555. The residence will be a
single-story wood frame structure. Ground floors will be structural over crawlspace in the living
area and slab-on-grade in the attached garage. The building has been designed to be supported
on spread footings using an allowable bearing pressure of 2,500 psf, as recommended.
At the time of our site visit, the foundation excavation which was essentially complete had been
cut in one level frorn about 2 to 3 feet beiow the adjacent ground surface. The materials exposed
in the bottom of the excavation consisted of medium hard to hard, sandstone/siltstone bedrock.
No free water was encountered in the excavation and the bedrock materials were slightly moist.
The conditions exposed in the excavaticn are consistent with thcse previously encountered on
the site and suitable for support of spread footings designed for the recornmended allowable
bearing pressure of 2,500 psf. Loose and disturbed materials should be removed in the footing
areas to expose the undisturbed bedrock. 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 materials
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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar &
David A. Young, P.
DAY/kac
l(ffi t ßrültbú,lno."
Gootechniml and Malerials Engineers
and Envimnmentel Scientists