HomeMy WebLinkAboutUpdate of Subsoil Study 06.18.2019K+A 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 Employee Owned Company www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 18, 2019
Bob Gibson
3092 Walnut Place
Grand Junction, Colorado 81504
bob(abuildwithrm.com
Project No. 19-7-337
Subject: Update of Subsoil Study Report for Foundation Design, Proposed Residence,
Lot FW -6, The Fairways, Aspen Glen, Golden Bear, Garfield County, Colorado
Dear Bob:
As requested, we are providing an update to the previous subsoil study conducted by Hepworth-
Pawlak Geotechnical (now Kumar & Associates) for design of foundations at the site, report
dated November 28, 2014, Job No. 114 516A for the current proposed development plan. The
findings of our review and recommendations for the foundation design are presented in this
report. The update was performed according to our agreement for professional services with you
dated May 22, 2019.
The proposed residence will be a 1 and 2 -story structure with slab -on -grade floor or structural
floor above crawlspace or above a basement level.
The subject site condition is essentially the same as described in the previous report with a gentle
slope down to the southwest and vegetated with grass and weeds. Adjacent Lot FW -5 is under
construction and Lot FW -7 is developed with a residence.
The clay soils encountered to a depth of 7 to 8 feet have variable compressibility/expansion
potential and excavation of the soils down to the dense, coarse granular soils is recommended to
achieve a low risk of foundation movement. Structural fill can be used to reestablish design
bearing levels. It may be feasible to limit the excavation depth to provide a minimum 3 feet of
compacted structural fill uniformly below shallow, frost depth foundations. We should evaluate
the exposed bearing soils at the time of excavation to confirm the need to sub -excavate the clay
soils and replace them with compacted structural fill. Other recommendations presented in the
previous report are considered applicable to the current project.
The conclusions and recommendations submitted in this letter are based on our review of the soil
conditions presented in the previous subsoil study report by others. Variations in the subsurface
Bob Gibson
June 18,2019
Page 2
conditions not identified 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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