HomeMy WebLinkAboutObservation of Excavation 04.29.2022I(+AKumar ni Associates, Inc.®
Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
Z� 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
April 29, 2022
Mountain West Construction
Attn: Darren Gallegos
58 Surrey Street
Carbondale, Colorado 81623
darrengallegosAhotmail.com
Project No. 21-7-238
Subject: Observation of Excavation, Proposed Residence, Lot E-30, Aspen Glen
Subdivision, 89 Fox Prowl, Garfield County, Colorado
Dear Darren:
As requested, the undersigned representative of Kumar & Associates observed the excavation at
the subject site on April 27, 2022 to evaluate the soils exposed for foundation support. The
findings of our observations and recommendations for the foundation support are presented in
this report. We previously provided a subsoil study for the residence in a letter report dated
April 20, 2021. The services were performed as supplemental services to, and in accordance
with, our agreement for professional engineering services to you dated March 3, 2021.
The proposed residence will be a one and two-story structure mainly over crawlspace with a
small basement area adjacent to the garage. The basement and garage floors will be slab -on -
grade.
At the time of our visit to the site, the foundation excavation had been cut in three levels from
3 to 7 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of relatively dense, slightly silty sandy gravel with cobbles and small boulders. The
soils were slightly moist and mostly light brown.
Considering the conditions exposed in the excavation and the nature of the proposed
construction, spread footings placed on the undisturbed natural soil designed for an allowable
soil bearing pressure of 2,500 psf can be used for support of the proposed residence. Footings
should be a minimum width of 16 inches for continuous walls and 2 feet for columns. Loose and
disturbed soils in footing areas should be removed and the bearing level extended down to the
undisturbed natural soils. Exterior footings should be provided with adequate soil cover above
their bearing elevations for frost protection. Continuous foundation walls should be reinforced
top and bottom to span local anomalies such as by assuming an unsupported length of at least
10 feet.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration. This study is based
on the assumption that soils beneath the footings have equal or better support than those exposed.
Mountain West Construction
April 29, 2022
Page 2
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.
Daniel E. Hardin, P.E.
Rev. by: SLP
DEH/kac
Kumar & Associates, Inc. Project No. 21-7-238