HomeMy WebLinkAboutObservation of Excavationl(+A Kumar
& Associates, Inc."Geotechnical and Materials Engineers
and Environmental Scientists
� ::: �
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
March 11, 2022
Michael & Barbara Gerber
138 Club Lodge, Aspen Glen
Carbondale, Colorado 81623
gerber@me.com
Subject:
Project No. 20-7-674.A
Observation of Excavation, Proposed Residence, Lot WP-9, Aspen Glen,
170 Midland Loop, Garfield County, Colorado
Dear Mr. & Mrs. Gerber:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 11, 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 November 23, 2020, Project No. 20-7-674.
The house construction is similar to that described in our previous report.
At the time of our visit to the site, the foundation excavation had been cut in three levels from
3 to 6 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of slightly silty, sandy gravel with cobbles and small boulders. No free water was
encountered in the excavation and the soils were slightly moist. The subgrade was being
protected with insulated construction blankets and the subgrade was not frozen.
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. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. 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
Michael & Barbara Gerber
March 11, 2022
Page2
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.
Daniel E. Hardin, P .E.
DEH/kac
cc: Dean Seader (division6.41lc@hotmail.com)
Kumar & Associates, Inc. ® Project No. 20-7-674.A