HomeMy WebLinkAboutObservation of Excavation 12.05.20221(+AKupw & Associates, In. ®
Geotedinical 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
December 5, 2022
Uriel Mellin
144 Cliffrose Way
Glenwood Springs, Colorado 81601
uriel.mellinL&hotmail.com
Project No. 22-7-441
Subject: Observation of Excavation, Proposed Addition to Existing Residence,
1452 County Road 259, Between Silt and Rifle, Garfield County, Colorado
Dear Mr. Mellin:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on December 4, 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 September 29, 2022, Project No. 22-7-441.
The addition will be on the south side of the existing house. New foundations are designed for
an allowable soil bearing pressure of 1,500 psf based on our previous report.
At the time of our visit to the site, the foundation excavation had been cut in one level from 2 to
3 %Z feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of loose to medium stiff, silty sand and clay. No free water was encountered in the
excavation and the soils were slightly moist to moist. The new footings were in place and the
foundation walls were formed.
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 1,500 psf. 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
(MOBC) developing in the future. If the client is concerned about MOBC, then a professional in
this special field of practice should be consulted.
Uriel Mellin
December 5, 2022
Page 2
If you have any questions .or need further assistance, please call our office.
Sincerely,
Kumar & Associates,
Daniel E. Hardin, l&E. X
Rev. by: SLP
DEH/kac
Kumar & Associates, Inc. 0 Project No. 22-7-441