HomeMy WebLinkAboutObservation of ExcavationKumar & Associates, Inc.®
K 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 Employe' Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
March 27, 2024
Revised April 2, 2024
Terry and Heidi Ruonavaara
1015 Hidden Valley Drive
Glenwood Springs, Colorado 81601
thruonavaara(a)msn. com
Project No. 21-7-795.A
Subject: Observation of Excavation, Proposed Residence, Lot 44, Spring Ridge Reserve,
1284 Hidden Valley Drive, Garfield County, Colorado
Terry and Heidi:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 22 and 27, 2024 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 30, 2021, Project No. 21-7-795.
At the time of our initial visit to the site, the foundation excavation had been cut to one level
from about 11/2 to 5%2 feet below the adjacent ground surface with depth decreasing toward the
north end. The shallower north and northwest part of the excavation exposed brown sandy clay
topsoil, while the remainder of the excavation exposed brown to red sandy silt and clay soil, with
some red sandstone exposed in the garage area. The excavator was advised that the northern
part of the excavation needed to be deepened to penetrate the topsoil and expose the sandy silt
and clay soil. At the time of our visit on March 27, the northern part of the excavation had
been deepened about 12 to 20 inches, exposing the sandy silt and clay soil. 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 1,500 psf. Loose and disturbed soils should be removed in the footing areas
and the expose soils should be moistened to near optimum and compacted prior to the placement
of concrete. The bearing soils should be protected against frost, and concrete should not be
placed on frozen 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
Terry and Heidi Ruonavaara
March 27, 2024
Revised April 2, 2024
Page 2
for possible changes to the 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, IPp0.RE
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Steven L. Pawlak, P.E.���
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Kumar & Associates, Inc. 0 Project No. 21-7-795.A