HomeMy WebLinkAboutObservation of Excavation 12.18.20251(+AKumar ni Associates, 5020 County Road 154
Geotechnical and Materialss Engineers Glenwood Springs, CO 81601
and Environmental Scientists phone: (970) 945-7988
email: kaglenwood@kumarusa.com
www.kumarusa.com
An employee Owned Company
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
December 18, 2025
RC Schneider Construction, Inc.
Attn: Bob Schneider
218 Valley Road
Carbondale, Colorado 81623
reschneiderconstCaDamail. com
Project No. 23-7-298.A
Subject: Observation of Excavation, Proposed Residence, Lot 67, Filing 9, Los Amigos
Ranch, 3426 Elk Springs Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on December 8, 2025 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 July 27, 2023, Project No. 23-7-298.
We understand that the proposed residence has been designed to be founded on spread footings
placed on the natural basalt rock soils and sized for an allowable bearing pressure of 2,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in two levels from 3 to
5 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of basalt gravel, cobbles, and boulders in a sandy silt matrix. 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 2,000 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
(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, I _
Robert L. Duran, 37322
Rev. by: SLPYA
•.1
RLD/kacs�ti "''C