HomeMy WebLinkAboutObservation of ExcavationKtnwY c ,lac.°
Geotechnical and Materials Engineers 5020 County Road 154
and Environmental Scientists Glenwood Springs, (10 81601
phone:(970) W 7988
I'm: (970) 9,15-845d
cnwih kaglenwood@kumar¢na.r„om
An Umooyae Owned Company twwwAiinm moon)
Office F�ocafions: 17rmcr (lIQ), I'arl<cr; Colorado 0prings, ibr[ Collins, Glenwood 6lviohs, and Surmnit County, Colorado
December 7, 2022
Rick Wallace
3539 N. Valley Steet
Arlington, Virginia 22207
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Project No. 21-7-160
Subject: Observation of Excavation, Proposed Residence, Lot 20, Coryell Ranch,
70 Cutbow Lane, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on December 7, 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 March 4, 2021, Project No. 21-7-160,
We understand the residence has been designed to be founded on spread footings bearing on the
natural granular soils and sized for an allowable soil bearing pressure of 2,500 psf.
At the time of our visit to the site, the foundation excavation had been cut in one levels from %z
to 2 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of silty to very silty sandy gravel and small cobbles. 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 suitable for support of spread footings designed for the recommended allowable
bearing pressure of 2,500 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. The bearing soils should be protected from frost and
concrete should not be placed on frozen 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 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
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.
Rick Wallace
December 7, 2022
Page 2
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc,
Danie
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cc: RM Construction— Sam Williams (swilliamani xog)
RM Construction —Ryan Fournoy (dour oy a builgwithrm._c„oln)
Kumar & Associates, Inc." Project No. 21.7.160