HomeMy WebLinkAboutObservation of Excavation 07.22.20220
1(+A Gumm $ Aswiclaft, Inc.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
July 22, 2022
DM Neuman Construction
Attn: Jason Neuman
P.O. Box 2317
Glenwood Springs, Colorado 81601
imn@dmneuman.com
Project No. 18-7-692.A
Subject: Observation of Excavation, Proposed Residence, 2808 County Road 117,
Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 21, 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 October 19, 2021, Project No. 18-7-692.
The proposed residence is essentially the same as described in our previous report and is
designed to be supported on shallow spread footings placed on compacted structural fill and
sized for an allowable bearing pressure of 2,000 psf.
At the time of our visit to the site, the building area had been mass excavated down in one level
from about 8 to 11 feet below the adjacent ground surface. The soils exposed in the bottom of
the excavation had been moistened and compacted and appeared to be through the old fill soils.
A sample of the stockpiled soil was taken for laboratory Proctor compaction testing, reported
under separate cover. No free water was encountered in the excavation and the soils were moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site. The clean excavated soils can be replaced compacted for support of spread footings
designed for the recommended allowable bearing pressure of 2,000 psf. Loose disturbed soils
should be moistened and compacted and the structural fill should be monitored for proper
compaction. 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
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
DM Neuman Construction
July 22, 2022
Page 2
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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Kumar & Associates, Inc. -k Project No.18-7-692.A