HomeMy WebLinkAboutObservation of ExcavationI( A Kumar & Associates, Inc.®Geotechnical and Materials Engineers+ and Environmental Scientists
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An Employee Owned Company
5020 County Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email: kaglenwood@kumarusa.com www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
July 22, 2022
Barrett Cyr
P.O. Box 9064
Aspen, Colorado 81612
barrett@cyrandcompany.com
Subject:
Project No. 21-7-620
Observation of Excavation, Proposed Residence, Lot 6, St. Finnbar Farm
Subdivision, 34 St. Finnbar Farm Road, Garfield County, Colorado
Dear Barrett:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on July 21, 2022 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 October 7, 2021, Project No. 21-7-620.
The proposed residence will be a one-story structure over a crawlspace. The attached garage
will have a slab-on-grade floor.
At the time of our visit to the site, the foundation excavation was complete and 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 slightly silty, sand, gravel and cobbles. The exposed sub grade had
been well-compacted. No free water was encountered in the excavation and the soils were
slightly moist to 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 2,000 psf. 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 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
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.
