HomeMy WebLinkAboutObservation of Excavation 07.11.22l$/t,äffi,åffiiffi'å*'.5020 Cou¡rty it*:¡<! 154
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July I1,2022
Cathey Massey
l80B Seeberg Circle
Carbondale, Colorado 81 623
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Project No. 20-7-688
Subject: Observation of Excavation" Proposed Residence and ADU, Lot 3, Wooden Deer
Subdivision, Wooden Deer Road, Garfield County, Colorado
Dear Cathey:
As requested, the undersigned representative of Kumar & Associates, Inc. observed the
excavation at the subject site on July 8, 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 November 13,2020, Project No. 20-7-688.
At the time of our visit to the site, the foundation excavation had been cut in two levels from
4 to 7 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of relatively dense, basalt rocks in a silt, sand and gravel matrix. No free water was
encountered in the excavation and the soils were slightly moist. The footing forms and rebar
were in place.
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 1,500 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. Other reconrmendations 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.
If you have any questions or need further assistance, please call our oftice.
Sincerely,
l{¡r¡x¡ar & ,Asscciaafes, I
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Daniel E. Hardin, P.E.
Rev. by: SLP
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