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 29, 2025
Silverado Builders LLC
Attn: Travis Jadwin
1647 County Road 109
Glenwood Springs, Colorado 81601
Project No. 25-7-490
Subject: Excavation Observation, Proposed Covered Patio, Five "Big Foot" Piers, 380
Equestrian Way, Lot E-7, Aspen Equestrian Estates, Carbondale, Colorado
Dear Travis:
As requested, a representative of Kumar & Associates observed the excavations at the subject
site on July 21, 2025 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations for the foundation support are presented in this report. The
services were performed in accordance with our agreement for professional engineering services
to Silverado Builders LLC, dated July 21, 2025.
Proposed piers will support a covered patio on the south side of the existing residence. An
assumed allowable soil bearing pressure of 1,500 psf was used for the foundation design.
At the time of our visit to the site, five foundation pier excavations had been cut in one level about
3 to 3½ feet below the adjacent ground surface. The soils exposed in the bottom of the
excavations consisted of medium dense, silty sandy gravel with cobbles. The results of a
gradation analysis performed on a sample of the silty sandy gravel (minus 3-inch fraction)
obtained from the site are presented on Figure 1. No free water was encountered in the
excavations, and the soils were moist.
Considering the conditions exposed in the excavations and the nature of the proposed
construction, spread footings placed on the undisturbed natural soil designed for an allowable soil
bearing pressure of 1,500 psf can be used for support of the proposed patio cover. Footing pads
should be a minimum width of 2 feet for columns. Loose and disturbed soils in footing areas
should be removed and the bearing level extended down to the undisturbed natural soils. Exterior
footings should be provided with adequate soil cover above their bearing elevations for frost
protection. Structural fill placed within floor slab areas can consist of imported ¾ inch road base
Kumar & Associates