HomeMy WebLinkAboutObservation of Excavation 03.14.2025
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
March 14, 2025
Dave Andrus
433 River View Drive, #1605
New Castle, Colorado 81647
dmandrus17@gmail.com
Project No. 24-7-240
Subject: Observation of Excavation, Proposed Residence, Lot 20, Rapids on the Colorado,
Rapids View Lane, Garfield County, Colorado
Dear Dave:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 13, 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 May 22, 2024, Project No. 24-7-240.
The proposed residence will be a wood-frame structure. The residence has been designed to be
supported on spread footings sized for an allowable bearing pressure 1,500 psf.
At the time of our visit to the site, the foundation excavation had been cut to one level from 1 to
3 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff, silty sandy clay. Results of swell-consolidation testing performed on samples
taken from the site, shown on Figure 1, indicate the soils have low compressibility under
conditions of loading and wetting. 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 1,500 psf. Loose disturbed soils should be removed in the footing areas to
expose the undisturbed natural clay soils. Any softened soils and mud from snowmelt should be
Dave Andrus
March 14, 2025
Page2
removed before concrete placement. 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, In
James H. Parsons, P.
Reviewed by:
�� Daniel E. Hardin, P .E.
JHP/
attachments Figure 1 -Swell Consolidation Test Results
Kumar & Associates, Inc. ® Project No. 24-7-240
Kumar & Associates