HomeMy WebLinkAboutObservation of Excavation 04.18.2024Kumar & Associates, Inc. 0
K Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
April 18, 2024
Maley Building Corp.
Attn: Jason Brown
P.O. Box 4028
Basalt, Colorado 81621
j ason(a)maleybuilding. com
Project No. 23-7-274.A
Subject: Observation of Excavation, Proposed Residence, Lot 7, St. Finnbar Ranch,
30 St. Finnbar Road, Garfield County, Colorado
Dear Jason:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on April 12, 2024 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 June 16, 2023, Project No. 23-7-274. The current observation was
performed in accordance with our agreement for professional services with Maley Building
Corporation dated April 5, 2024.
The proposed residence will be a one- and two-story wood -frame structure. The proposed
residence has been designed to be supported on spread footings 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 one level from
2 to 3 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of a mix of sandy silty topsoil and silty sandy gravel and cobbles. No free water was
encountered in the excavation and the soils were slightly moist to moist.
It was recommended the topsoil encountered in the excavation be sub -excavated to expose the
gravel subsoils. The sub -excavated depth can be backfilled with onsite granular soils moisture
conditioned to near optimum moisture content and compacted to at least 98 percent of maximum
standard Proctor density. The gravel soils exposed in the excavation and below the topsoil 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. Topsoil and
loose disturbed soils should be removed in the footing areas to expose the undisturbed natural
granular 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
Maley Building Corp.
April 18, 2024
Page 2
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,
N. I -AA
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James H. Parsons, U&q/,ZZ,�
Rev. by: SLP
JHP/kac
cc: KA Designworks — Erik Hendrix — (erik ,ka-designworks.co_m)
Kumar & Associates, Inc. 0 Project No. 23-7-274.A