HomeMy WebLinkAboutObservation of ExcavationKumar & Associates, Inca
'f Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone. (970) 945-7988
fax: (970) 945-8454
email: kaglenwoodCkumarusa.com
An Employee owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
December 10, 2024
Maley Building Corp.
Attn: Jason Brown
P.O. Box 4028
Basalt, Colorado 81621
j asonC&nialeybuilding.com
Project No. 23-7-274.A
Subject: Observation of Excavation, Proposed ADU, 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 December 10, 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 ADU will be located about 60 feet south of the main residence.
At the time of our visit to the site, the foundation excavation had been cut in one level from 3 to
4 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of 3/ -inch road base. We understand about 3 feet of road base was placed below the
current bottom of excavation. Based on a utility trench excavation located about 50 feet to the
east of the ADU, there was some clay soil removed down to the underlying dense gravel soils.
This is similar to the overexcavation and replacement that was performed for the residence. No
free water was observed in the ADU excavation. The fill soils had been compacted and were
moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and should be suitable for support of spread footings designed for the recommended
allowable bearing pressure of 3,000 psf. The bearing soils should be protected from frost and
concrete should not be placed on frozen 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 limited subsurface exploration 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
Maley Building Corp.
December 10, 2024
Page 2
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&+
Daniel F
Rev. by,
DEH/ka
cc: KA Designworks — Erik Hendrix (erik(&ka-designworks.com)
Kumar & Associates, Inc. 0 Project No. 23-7-274.A