HomeMy WebLinkAboutObservation of Excavation 02.09.20221(+AKW= & Asnellifts, Inc. -
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
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
February 9, 2022
SCIB, LLC
Attn: Luke Gosda
0115 Boomerang Road, Suite 5201 B
Aspen, Colorado 81611
luke. o�(a,sunriseco.com
Project No. 21-7-337
Subject: Observation of Excavation, Proposed Residence, Lot 27, Ironbridge, 1526 River
Bend Way, Garfield County, Colorado
Dear Luke,
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on February 9, 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 May 7, 2021, Project No. 21-7-337. The current
observations were performed supplement to and in accordance with our agreement for
professional services with SCIB, LLC dated April 8, 2021.
At the time of our visit to the site, the excavations were complete. The foundation excavation for
the residence had been cut to one main level from about 2%2 to about 4'/2 feet below adjacent
ground level, with a secondary level for the attached garage perimeter footing cut to about
3'/2 feet below adjacent ground level. The excavation for the detached garage had been cut to
one level about 4'/2 feet below adjacent ground level. At foundation levels, the excavations
exposed stiff to very stiff, sandy silt and clay or dense, slightly silty, sandy gravel and cobbles
with small boulders. Some areas of standing water from melted snow were observed in the
excavation and the soils were slightly moist to wet.
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. Any loose and disturbed soils should be removed in the footing
areas to expose the undisturbed natural soils prior to the placement of concrete. The bearing
soils should be protected against water seepage and frost, and concrete should not be placed on
wet or 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
SCIB, LLC
February 9, 2022
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.
David Noteboom, Staff Engineer
Reviewed by:
Steven L. Pawlal
SLP/kac
Kumar & Associates, Inc. y, Project No. 21-7-337