HomeMy WebLinkAboutObservation of Excavation 07.11.20231(+AGeotechnical 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
July 11, 2023
Burkholder Homes
Attn: Todd Burkholder
P.O. Box 400
Carbondale, Colorado 81623
todd(&burkholderhomesinc. com
Project No. 22-7-58LA
Subject: Observation of Excavation, Proposed Residence, Lot 37, Filing 9, Elk Springs,
0095 Vista Place, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on July 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 November 15, 2022, Project No. 22-7-581. The current observation
was performed in accordance with our agreement for professional services with Burkholder
Homes dated July 7, 2023.
The proposed residence is designed to be supported on spread footings sized for the
recommended allowable bearing pressure of 2,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in one main level from
about 4 to 10 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of basalt rock in a calcareous silt matrix. No free water was encountered in
the excavation and the soils were slightly 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 2,000 psf. Loose disturbed soils should be removed in the footing areas 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.
Burkholder Homes
July 11, 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!i �^e.70W23
SLP/kac
Kumar & Associates, Inc. � Project No. 22.7.581.A