HomeMy WebLinkAboutObservation of Excavationlfrn l(nm* & As*ocffi,lils.s
Geotechnical and Materials Engineers
and fnvir*nmental $cientistn
An Emplqnl Oifild Colrtpsv
5020 Cou*ty Road i54
Glenwood Springso C0 81601
phoue: (970) 945'7988
far: {970} 945-8454
email : kagleirwood@kunrarusa.corn
Fww.kam+{usa,com
Office L.ocations: Ilenver {HQ}, ?arker, Colorado Springs, Fort Co.llins, Slenwocd Springs, and Summit County, Colorado
March 6,2025
Ben Wagenman
126 County Road 238
Silt, Colorado 81652
cleocqqstrrcti*n{Ogmail.S,p,sl Project No.22-7-719
Subject: Observation of Excavation, Proposed Barn/ADU, 999 County Road 238, Garfield
County, Colorado
Dear Ben:
As requested, a representative of Kumar & Associates, Inc. observed the excavation for the
ban/ADU at the subject site on February 22,2025 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 January 11,2023, Project No.22-7-719.
At the time of our visit to the site, the foundation excavation had been cut in two levels from 2 to
lUVz feetbelow the adjacent grourld surface. The soils exposed in the bottom of the excavation
consisted of medium dense, silty sand. No free water was encountered in the excavation and the
soils were moist. Laboratory testing indicated the silty sand had a dry unit weight of I 16 pcf at
11.1 percent moisture content with 36% silt.
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 2,000 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 subsurface exploration at the site. Variations
in the subsurface conditions below the excavation could increase the risk of for:ndation
movement. We should be advised of any variations encountered in the excavation conditions
for possible changes to recommendations contained in this letter. Our seryices do not include
determining the prese,nce, 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 office.
Sincerely,
Kumar & Associates, lnc.
Daniel E. Hardin, P
Rev. by: SLP
DEH/kac