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December 12,2024
Edgar Rojo
2374County Road 112
Carbondale, Colorado 81 623
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DEC i I 2024
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Project No.23-7-612
Subject:observation of Excavation, Proposed Residence, 2374 County Road 112, Garfield
County, Colorado
Dear Edgar:
As requested, a representative of Kumar & Associates observed the pit excavation at the subject \
site on December l0,20z4to evaluate the soils exposed for foundation support. The findings of k-
our observations and recommendations for the foundation support are presented in this t"pot. (J
We previously observed a pit dug in this area and provided recommendations in a letter dated \
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The proposed residence will be a small, two-story wood frame structure located on a small ridge lt
above the Cattle Creek valley. The site is in an open pinon/cedar forest. The proposed building \.\
area slopes gently to moderately down to the west. Just to the north of the building area, the -\ -
ground slopes steeply down toward CattleCreek' -\
At the time of our recent visit to the site, the excavation had been excavated down to a depth of .,S
about 6 feet below the adjacent ground surface on the east side and up to about 2 feet down on \
the west side. The subgrade was covered with ground blankets but based or1 the sides of the
excavation , clayey silty sand and gravel with cobbles was encountered in the bottom of the
excavation. No free water was encountered in the excavation.
Considering the conditions exposed in the excavation and the nature of the proposed
construction, spread footings placed on the undisturbed natural soil designed for an allowable
soil bearing pressure of 2,000 psf can be used for support of the proposed residence. Structural
fill placed within floor slab areas can consist of the on-site soils or % inchroad base compacted
to at least 95% of standard proctor density at a moisture content near optimum. Backfill placed
around the structure should be compacted and the surface graded to prevent ponding within at
least l0 feet of the building. Other recommendations contained in our previous report should
also be followed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within current excavation. This study is based on the assumption that bedrock beneath the
footings have equal or better support than those exposed. The risk of foundation movement may
Edgar Rojo
December 12,2024
Page2
be greater than indicated in this report because of possible variations in the subsurface
conditions. 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
concemed about MSBC, 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,
$dc*r$*r & &sstlci*st*s-{ltl*.
Daniel E. Hardin, P.
DEH/kac
cc: Albright and (j a*k @a-lbf: sfo t:fi ,$pqqiatPS, s*;Ei)
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