HomeMy WebLinkAboutObservation of Excavation 11.15.2025Kurtiar & Asseclates, Iluc.®
K 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 Sumnrit County, Colorado
November 15, 2023
Justin Sanford
200 Mountain Shadows Drive
Glenwood Springs, Colorado 81601
j ustin(&,, go -rentals. com
Project No. 22-7-304.A
Subject: Observation of Excavation, Proposed Residence, Lot 12, Rapids on the Colorado,
12 Rapids View Lane, Garfield County, Colorado
Justin:
As requested by Dave Ockers, a representative of Kumar & Associates, Inc. observed the
excavation at the subject site on November 11, 2023 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 June 6, 2022, Project No. 22-7-304.
At the time of our visit to the site, the building excavation had been cut in 2 levels about 4%2 feet
below the adjacent ground surface. The grade step between levels was about 1 foot and we
understand sub -excavation was needed in some areas to remove the upper silt soils. The soils
exposed in the bottom of the excavation consisted of silty sandy gravel with cobbles. No free
water was encountered in the excavation and the soils were slightly moist.
The gravel 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 disturbed soils in the footing areas
should be moistened and compacted or removed to expose the undisturbed natural soils.
Structural fill placed to reestablish design bearing level should be compacted to at least 98% of
standard Proctor density. 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.
Justin Sanford
November 15, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
�i 15222
Steven L. Pawlak, P
SLP/kac Z'4 *000*0
cc: Ockers Construction — ckers(david(a�dockersconstruction.com)
Kumar & Associates, Inc. 0 Project No. 22-7-304.A