HomeMy WebLinkAboutObservation of Excavation 09.29.2022Geotechnical and Materials Engineers 5020 County Road 154
11tt-An and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
1 fax: (970) 945-8454
email: kaglenwood@kumamsa.com
An Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
September 29, 2022
Decatur Wilkie
Attn: Mark Elice
20 Sunset Drive, #3
Basalt, Colorado 81621
marker decaturwilkie.com
Project No. 22-7-614
Subject: Observation of Excavation, Proposed Residence, 1002 Skipper Drive, Lot 1,
Stirling Ranch, Garfield County, Colorado
Dear Mark:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on September 9, 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. LKP Engineering previously conducted a subsoil study for design of foundations at the
site and presented their findings in a report dated September 25, 2021, Project No. 21-3550.
At the time of our visit to the site, the foundation excavation had been cut in multiple levels from
2 to 8 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of basalt rocks with a whitish, silty sandy clay 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 and disturbed soils should be removed in the footing areas
to expose the undisturbed natural basalt rock soils. Other recommendations presented in the
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 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 & Associ
Daniel E. Hardin, P.
DEH/kac ��••.•••�