HomeMy WebLinkAboutObservation of ExcavationKumar & Associates, Inc. 11
'( 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
M Employ" mimed Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
May 15, 2024
RM Construction
Attn: Blake Piland
5030 County Road 154
Glenwood Springs, Colorado 81601
Make(_ buiIdwithrm.com
Project No. 21-7-13 LA
Subject: Observation of Excavation, Proposed Residence, Lot SD-12, Aspen Glen,
115 Sundance Trail, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on May 15, 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 February 6, 2021, Project No. 21-7-131. The current observation was
performed in accordance with our agreement for professional services with RM Construction
dated May 14, 2024.
The residence has been designed to be supported by spread footings placed on the natural gravel
soils and 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 main level from
typically about 3 to 4 feet below the adjacent ground surface. The east side of the excavation
stepped up about 2'/2 feet to a second cut level. The soils exposed in the bottom of the
excavation mainly consisted of silty sandy gravel with cobbles. The western part transitioned
into stiff sandy silty clay which based on our observations could be up to around one foot in
thickness above the gravel soils. No free water was encountered in the excavation and the soils
were slightly moist.
The soil conditions exposed in the excavation 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. There may be settlement potential in the clay area if the bearing
soils are wetted but with the limited thickness should be around one inch or less. Loose and
disturbed soils should be removed in the footing areas to expose the undisturbed natural 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
RM Construction
May 15, 2024
Page 2
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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
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Steven L. Pawlak, P. �
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Kumar & Associates, Inc. 0 Project No. 21-7-131.A