HomeMy WebLinkAboutObservation of Excavation 01.21.2026Kumar & Associates, Inc.® 5020 County Road 154
'( Geotechnical and Materials 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
January 21, 2026
Norsk Builders
Attn: Chris Hjorth
79 Navajo
Carbondale, Colorado 81623
norskbuilders(cDgmail. com
Project No. 17-7-787.A
Subject: Observation of Excavation, Proposed ADU, Lot 23, Stirling Ranch, Skipper Drive
and Schooner Lane, Garfield County, Colorado
Dear Chris:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on January 20, 2026 to evaluate the soils 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 for the residence at the site and
presented our findings in a report dated December 11, 2017, Project No. 17-7-787. We previously
observed the main residence excavation on December 6, 2023 as described in our report dated
December 15, 2023.
At the time of our visit to the site, the ADU construction was nearing completion. The ADU is
located north of the main residence. The excavation for the ADU foundation had evidently been
excavated below the surrounding grade from 2 to 8 feet. The soils previously encountered at the
site and exposed in the cut bank north of the ADU area consist of mostly sandy silt and clay with
basalt rocks. The foundation excavation had been backfilled to near finish grade. No free water
was encountered in the excavation cut located north of the ADU.
Based on our conversation with the contractor, the soils exposed in the ADU excavation were
similar to those encountered in the nearby main residence excavation. No evidence of foundation
or floor slab settlement was observed during our site visit or reported by the contractor.
The soil conditions currently exposed at the site 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.
The recommendations submitted in this letter are based on our observation of the soils exposed
in the area around the ADU and our previous subsurface exploration and observations 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.
Norsk Builders
January 21, 2026
Project No. 17-7-787.A
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, I
24443
Daniel E. Hardin, P. 1 j�c%2L
Rev. by: SLIP
DEH/kacS�ONAL
Kumar & Associates, Inc