HomeMy WebLinkAboutObservation of Excavation
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
email: kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
July 24, 2025
Brandon Cowhey
571 Riverbend Way
Glenwood Springs, Colorado 81601
cowheybrandon@gmail.com
Project No. 21-7-851
Subject: Observation of Excavation, Proposed Residence, Lot 118, Ironbridge, 227 Silver
Mountain Drive, Garfield County, Colorado
Dear Brandon:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on July 14, 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 December 7, 2021, Project No. 21-7-851.
We understand the proposed residence has been designed to be founded on spread footings
placed on the natural granular soils and sized for an allowable bearing pressure of 3,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in three levels from 1½
to 8½ feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of silty sandy gravel with cobbles and small boulders. The results of a gradation
analysis performed on a sample of the silty sandy gravel (minus 5-inch fraction) obtained from
the site are presented on Figure 1. 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 3,000 psf. 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.