HomeMy WebLinkAboutObservation of Excavation 06.25.2024I Clt rffi,i#f:T#f;'Yr;i'**"
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June25,2024
Smith Mountain Builders
Attn: Zach Smith
10l l Heritage Drive
Carbondale, Colorado 81 623
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Subject:
Project No.20-7'474.4
Observation of Excavation, Proposed Residence, Lot Ml0, Roaring Fork Mesa,
Aspen Glen, 435 Brookie, Garfield County, Colorado
Dear Zach;
As requested by Rocky, a representative of Kumar & Associates, Inc. observed the excavation
at the subject site on June 25, 2024 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 September 25,2020, Project No. 20-7-474. The current
observation was performed in accordance with our agreement letter to Smith Mountain Builders
dated June25,2024.
The house will be a two story wood frame structure over a crawlspace. The attached garage
will have a slab-on-grade floor.
At the time of our visit to the site, the foundation excavation had been cut in three levels
from3t/z to 7 feetbelow the adjacent ground surface. The soils exposed in the bottom of the
excavation consisted of relatively stiff, sandy silty clay. Wetting of the footing subgrade
soils should be avoided following house construction. 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 2,000 psf with a risk of movement. Loose and disturbed soils
should be removed in the footing areas to expose the undisturbed natural 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
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