HomeMy WebLinkAboutObservation of Excavation 11.30.20211(+AGeotechnicai 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
November 30, 2021
James Gornick Building Specialists
Attn: Jim Gornick
1005 Cooper Avenue
Glenwood Springs, Colorado 81601
j gornick 198 8 ", gtnail. com
Project No. 20-7-641
Subject: Observation of Excavation, Proposed Residence, Lot E-53, Aspen Glen,
22 Kingfisher Lane, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on November 30, 2021 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 4, 2020, Project No. 20-7-641.
We understand the proposed residence has been designed to be founded on spread footings
bearing on the natural granular soils and sized for an allowable bearing pressure of 2,500 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level about
2 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of relatively dense silty sandy gravel and cobbles. 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 2,500 psf. Loose and disturbed soils should be moistened and compacted or
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 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
James Gornick Building Specialists
November 30, 2021
Page 2
(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.
Robert L. Duran, P
Rev. by: SLP
RLD/kac
Kumar & Associates, Inc. Project No. 20-7-641