HomeMy WebLinkAboutObservation of ExcavationKumar & Associates, Inc.® 5020 County Road 154
'( Geotechnical and Materials Engineers Glenwood Springs, CO 81601
and Environmental Scientists phone: (970) 945-7988
email: kaglenwood@kumarusa.com
www.kumarusa.com
An Employ" t WT" Company
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
September 30, 2025
J Martinez and Company
Attn: Aaron Higgins
1161 Munro Avenue
Rifle, Colorado 81650
aaronO-im-co.ord
Project No. 22-7-532.A
Subject: Observation of Excavation, Proposed Residence, Lot H4, Filing 6, Aspen Glen,
29 Sage Court, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on September 29, 2025 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 October 12, 2022, Project No. 22-7-532. The current
observation was performed in accordance with our agreement for professional services with J
Martinez and Company dated September 29, 2025.
The proposed residence has been designed to be supported on spread footings placed on the
natural soils and sized for the recommended allowable bearing pressure of 1,500 psf with a
settlement risk.
At the time of our visit to the site, the foundation excavation for the residence and a small area
of the garage had been cut in one level from about 2 to 3 feet below the adjacent ground
surface. The soils exposed in the bottom of the excavation consisted of porous, sandy silty clay
with some roots. The garage area was stripped of topsoil at rough slab subgrade level. No free
water was encountered in the excavation and the soils were relatively dry.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and can be used for support of spread footings designed for the recommended
allowable bearing pressure of 1,500 psf with a settlement risk mainly if the bearing soils are
wetted. The loose disturbed soils in the footing areas should be moistened to near optimum
and well compacted. Other recommendations presented in our previous report which are
applicable, especially those to keep the bearing soils dry, 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
J Martinez and Company
September 30, 2025
Project No. 22-7-532.A
Page 2
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 & Assoc
Steven L. Pawla4
SLP/kac
Kumar & Associates, Inc