HomeMy WebLinkAboutObservation of Excavation 12.17.2025Kumar ni AeInc.®
Geotechnical and Materials Engin
eers 5020 County Road 1541(+Aand 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
May 3, 2023
Steve & Kim Ochko
4362 County Road 100
Carbondale, Colorado 81623
kim(a-) gouldconstruction.com
Project No. 22-7-595
Subject: Observation of Excavation, Proposed ADU Residence, 4362 County Road 100,
Garfield County, Colorado
Dear Steve & Kim:
As requested, the undersigned representative of Kumar & Associates, Inc. observed the
excavation at the subject site on May 2, 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 11, 2022, Project No. 22-7-595.
At the time of our visit to the site, the foundation excavation had been cut in one level from 2 to
9 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of medium stiff, sandy silt. No free water was encountered in the excavation and the
soils were slightly moist to 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 1,500 psf with the risk of post -construction settlement mainly if the bearing
soils are wetted. 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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kum,
Dani,
Rev.
DEH