HomeMy WebLinkAboutObservation of Excavation 02.10.22'( � !tamer ni Asaociaieri mc.®
Geotechnicai and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumamsa.com
An Employee Owned Cowpony www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
February 10, 2022
Peak 3 Stonefly LLC
c/o Peak 3 Construction + Development
Attn: Bryant Ragan
601 East Hopkins Avenue, Suite 202
Aspen, Colorado 81611
bryant&eak3 aspen. com
Project No. 21-7-492
Subject: Observation of Excavation, Proposed Residence, Lot 1, 297 Stonefly Drive,
Coryell Ranch, Garfield County, Colorado
Dear Bryant,
As requested by Jeff Claflin, a representative of Kumar & Associates, Inc. observed the
excavation at the subject site on February 10, 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 July 19, 2021, Project No. 21-7-492. The
current observations were performed supplemental to and in accordance with our agreement for
professional services with Peak 3 Stonefly LLC dated May 26, 2021.
At the time of our visit to the site, the excavations were complete. The foundation excavation for
the residence had been cut to one main level from about 4%2 feet to 6 feet below adjacent ground
level. The excavation for the detached barn and ADU had been cut to one main level about 6 feet
below adjacent ground level, with a secondary level for the attached garage perimeter footing cut
to about 5 feet below adjacent ground level. At foundation levels, the excavations exposed
relatively dense, slightly silty, sandy gravel and cobbles with small boulders. Some areas of wet
soil from melted snow and two small patches of snow were observed in the excavation. The
soils were typically slightly moist to moist and not frozen.
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 3,000 psf. Any loose and disturbed soils should be removed in the footing
areas to expose the undisturbed natural soils prior to the placement of concrete. The excavation
should be protected against water seepage, 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
Peak 3 Stonefly LLC
c/o Peak 3 Construction + Development
February 10, 2022
Page 2
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.
0
David Noteboom, Staff Engineer
Reviewed by:
Steven L. Pawlak .fs � 15222 =
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Cc: Peak 3 Cons Q ,� pment — Jeff Claflin (jeff(rrpeak3aspen,com)
Kumar & Associates, Inc. v4 Project No. 21-7-492