HomeMy WebLinkAboutFooting Subgrade Observation 09.04.2024CTLITHOMPSON
September 4, 2024
Jonathan Duffy
90 Mountain Shadows Drive
Glenwood Springs, CO 81601
Subject: Footing Subgrade Observation
Duffy Residence
1360 County Road 331
(a.k.a. Parcel 217915300489)
Garfield County, Colorado
Project No. GS06684.000E-345
CTLIThompson, Inc. (CTLIT) visited the site of the Duffy Residence being constructed at
1360 County Road 331 in Garfield County, Colorado on August 16, 2024. The purpose of our
site visit was to observe the footing subgrade soils in the foundation excavation for the resi-
dence. The subgrade soil consisted of structural fill comprised of the on -site sandy clay. A pho-
tograph of the site, prior to fill placement, is below.
Foundation excavation looking northwest
CTLIThompson, Inc. performed a geotechnical engineering investigation for the Duffy
Residence (Project No. GS06684.000-120; report dated August 16, 2024). Our report recom-
mended that the soils below footings be subexcavated to a depth of 2 feet below bottom of foot-
ing elevation and replaced as densely compacted, structural fill. Our representative tested mois-
ture content and density of the structural fill during placement. Our site observations and test re-
sults indicate the structural fill was placed in general conformance with project specifications.
CTLIThompson, Inc.
Denver, Fort Collins, Colorado Springs, Glenwood Springs, Pueblo, Summit County — Colorado
Cheyenne, Wyoming and Bozeman, Montana
Based on our field data, as well as observations during our August 16, 2024, site visit,
CTLIT judges the structural fill is suitable for support of footings designed for a maximum allow-
able bearing pressure of 3,000 psf.
We are available to discuss the contents of this letter. Please contact us if you have
questions or need additional information.
CTLITHOMPSON, I
Ryan R. Barbone,
Division Manager
Reviewed Nb
James D,
Principal Engineer
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JONATHAN DUFFY Page 2 of 2
DUFFY RESIDENCE
CTLIT PROJECT NO. GS06684.00017-345