HomeMy WebLinkAboutObservation of Excavation 06.29.2022'L AmKomr ni Associates,Inc. 11
Geoteceotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81b01
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood(a),kumarusa.com
An EMPloyeo Ownod Company www.kumarasa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 29, 2022
Stangl & Son Builders
Attn: Geoff Stangl
P.O. Box 3680
Basalt, Colorado 81621
geoffa,stan glbuilders. com
Project No. 21-7-24 LA
Subject: Observation of Excavation, Proposed Residence, Lot GV-13, Aspen Glen,
13 Mariposa, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 28, 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 April 28, 2021, Project No. 21-7-241. The current observation was
conducted in accordance with our professional services agreement with Stangl & Son Builders
dated June 28, 2022
The proposed residence will be one and two story wood frame construction above a crawlspace
and with an attached garage. Garage floor will be slab -on -grade. Spread footings placed on the
natural soils and sized for the recommended allowable bearing pressure of 1,500 psf were
designed for the foundation support.
At the time of our visit to the site, the foundation excavation had been cut in one level from 3 to
4 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of sandy silty clay. No free water was encountered in the excavation and the soils were
slightly moist to moist.
Stangl & Son Builders
June 29, 2022
Page 2
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 with a settlement risk mainly if the bearing soils are wetted. Loose
disturbed soils in the footing areas should be removed and the exposed soils moistened and
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 limited 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.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
Steven L. Pawlak, P.E.
SLP/ljf
, 7 p •'9
n 15222
Kumar & Associates, Inc.
Project No. 21-7-241.A