HomeMy WebLinkAboutObservation of Excavation 01.20.2022Associates, Inc.0
1(+AKWW &
Geotechnigl 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
January 20, 2022
Peak 3 Construction + Development
Attn: Bryant Ragan
601 East Hopkins Avenue, Suite 202
Aspen, Colorado 81611
bryant(&-peak3 aspen. com
Project No. 19-7-285.A
Subject: Observation of Excavation, Proposed Residence, Lot SD-7, Aspen Glen,
1070 Bald Eagle Way, Garfield County, Colorado
Gentlemen:
As requested by Matt Korus of Peak 3 Construction + Development, a representative of Kumar
& Associates observed the excavation at the subject site on January 17 and 20, 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 June 14, 2019,
Project No. 19-7-285.
The residence design is generally similar to that described in our previous report and will be
supported on spread footings placed on the natural gravel soils or compacted structural fill and
sized for an allowable bearing pressure of 2,500 psf.
At the time of our initial visit to the site, the foundation excavation had been cut from about 2%2
to 5'/2 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
mainly consisted of silty sandy gravel with cobbles but the south end about 3 to 5 feet deep was
still based in sandy silt and clay soils which were recommended to be removed. When observed
on January 20, the south end had been lowered around 1 to 1 %2 feet and based in the dense, silty
sandy gravel with cobbles. No free water was encountered in the excavation and the soils were
slightly moist to moist.
The natural gravel soils 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 2,500 psf. Loose disturbed soils in the footing areas
should be removed prior to forming footings or placing structural fill. We should observe
placement and compaction of structural fill below footing areas which we understand will be
CDOT Class 2 (3/-inch) base course. 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
Peak 3 Construction + Development
January 20, 2022
Page 2
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.
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Steven L. Pawlak,
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Kumar & Associates, Inc. 11 Project No.19-7-285.A