HomeMy WebLinkAboutObservation of Excavation 04.25.2022c.
1(+Aandni �cials En®
Geotechnicai and Materials Engineers 5020 County Road 154
Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
1 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
April 25, 2022
Rueben Ruiz
P. O. Box 456
Silt, Colorado 81652
rrtruckingl @hotmail.com
Project No. 20-7-557.01
Subject: Observation of Excavation, Proposed Residence, 6782 County Road 346, Lot 2,
Ruiz Minor Subdivision, Garfield County, Colorado
Dear Rueben:
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on April 25, 2022 to evaluate the soils 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. 20-7-557. The proposed construction
is similar to that assumed for our subsoil study. The building has been designed to be supported
on spread footings sized for an allowable soil bearing pressure of 1,500 psf based on
recommendations provided in our previous report.
At the time of our site visit, the foundation excavation which was essentially complete had been
cut in one level from about 3 to 4'/2 feet below the adjacent ground surface. There was minor cut
at the attached garage floor slab area. The soils exposed in the bottom of the foundation
excavation consisted of stiff, sandy to very sandy silty clay. No free water was encountered in
the excavation and the soils were moist.
The soil conditions exposed in the excavation are generally consistent with those previously
encountered on the site and suitable for support of spread footings designed for the
recommended allowable bearing pressure of 1,500 psf. The risk of foundation movement is
primarily if the bearing soils were to become wetted and precautions should be taken to prevent
wetting. Prior to the footing construction, all loose and disturbed soils should be removed in to
expose the undisturbed natural soils and the subgrade compacted. 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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar &
David A. 'Y
DAY/kac