HomeMy WebLinkAboutObservation of Excavation 03.28.2022Itrtm;***
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March 28,2022
Trevor Ruonavaara
160 Spring Ridge Drive
Glenwood Springs, Colorado 81601
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Project No.2l-7-923
Subject:Observation of Excavation, Proposed Residence, I 143 County Road 3 I 1 ,
Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on March 23,2A22 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 provided geotechnical recommendations for design of foundations at the
site and presented our findings in a report dated December 15, 2021, Project No. 2l-7-923.
The residence development plan is essentially the same as described in our previous report and
the foundation has been designed to be supported by shallow spread footings sized for an
allowable bearing pressure of 1,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in one level frorn I to
4 feet below the adjacent ground surface. The shallow cut depth is in the north, garage area with
the deeper part in the south, crawlspace area. The soils exposed in the bottom of the excavation
\ryere somewhat variable and mainly consisted of sandy clayey silt to silty sand with gravel and
scattered cobbles near the south end. The laboratory testing results will be presented later. No
free water was encountered in the excavation and the soils were slightly moist to moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and can be used for support of spread footings designed for the recommended
allowable bearing pressure of 1,00û psf with a risk of settlement mainly if the bearing soils are
wetted after construction. Loose disturbed soils in footing areas should be removed and the
exposed subgrade moistenecl and compacted. The bearing soils should be protected from frost
and concrete should not be placed on frozen soils. Other recommendations presented in the
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
foundation movement. We should be advised of any variations encountered in the excavation
Trevor Ruonavaara
March 28,2022
Page2
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 ofpractice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kuma¡' d{¿ Assoaiafes, Inc"
Steven L. Paw
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