HomeMy WebLinkAboutObservation of Excavation 04.19.2022
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
April 19, 2022
Russell Cartwright
35 Willowview Way
Parachute, Colorado 81635
russecart@gmail.com
Project No. 21-7-440.01
Subject: Observation of Excavation, Proposed Residence, Lot 9, First Eagles Point,
Battlement Mesa, 142 Eagle Ridge Drive, Garfield County, Colorado
Dear Russell:
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on April 6, 2022 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations are presented in this report. The services are supplemental to
our agreement for professional services to you dated May 5, 2021.
We previously prepared a subsoil study for design of foundations at the site and presented our
findings in a report dated July 12, 2021, Project No. 21-7-440. The proposed construction is
similar to that assumed for our subsoil study report and will consist of a 1 to 1½ story wood
frame structure over crawlspace with an attached slab-on-grade garage. Spread footings bearing
on the natural granular soils sized for an allowable soil bearing pressure of 2,000 psf were
recommended for foundation support.
At the time of our site visit, the foundation excavation which was essentially complete had been
cut in one level up to about 4½ feet below the adjacent ground surface daylighting to the
southeast. There was minor cut in the garage floor slab area. The soils exposed in the bottom of
the excavation consisted of medium dense, clayey silty sandy gravel and cobbles. Results of
swell-consolidation testing performed on samples taken from the site, shown on Figure 1,
indicate the silty clay matrix soils are moderately compressible under conditions of loading and
wetting with a low hydro-compression potential. No free water was encountered in the
excavation and the soils were generally 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 granular soils and the subgrade compacted. 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 limited subsurface exploration at the site.
Variations in the subsurface conditions below the excavation could increase the risk of
Kumar & Associates