HomeMy WebLinkAboutObservation of Excavation 11.09.2023Kumar & Aswclates, Inc.0
'f 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
November 9, 2023
SCIB, LLC
Attn: Luke Gosda
0115 Boomerang Road, Suite 5201B
Aspen, Colorado 81611
lukegosda(c�sunriseco. corn
Project No. 21-7-683.A
Subject: Observation of Excavation, Proposed Residence, Lot 60, Ironbridge, Phase III,
15 Blue Heron Drive, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on November 7, 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 October 12, 2021, Project No. 21-7-683.
The proposed residence is generally the same as described in our previous report and designed to
be supported on spread footings sized for an allowable bearing pressure of 1,500 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level from
about 2 to 3 to feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of sand silt and relatively dense, silty sandy gravel with cobbles. The silt
depth appeared relatively shallow, around a foot deep or less and the subgrade had been
compacted. No free water was encountered in the excavation and the soils were 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 1,500 psf. Loose and disturbed soils in the footing areas should be moistened
and compacted or removed to expose the undisturbed natural 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
(MOBC) developing in the future. If the client is concerned about MOBC, then a professional in
this special field of practice should be consulted.
SCIB, LLC
November 9, 2023
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates,
Steven L. Pawlak, P.Eko
SLPAkac sMe-
Kumar & Associates, Inc. 0 Project No. 21-7-683.A