HomeMy WebLinkAboutObservation of Excavationl{Frt$ffiififfiffiHd-*
An Fmployaa Oryn€d CdnPonY
5020 County Road 154
Glenwood SPrings, CO 81601
phone: {970} 945-7988
fax: {970} 945-8454
email : kaglenwood@ftumarusa"com
www.kuraarusa.eom
Offfice t ocations: Dmver {HQ), Parker, Colorado Sprinp' Fo*Collins, Glenwood Springs, and SummitCounty' Colorado
Novernber 8,2024
Ed Baker
P.O. Box 284
Parachute, Colorado 8 I 635
bakeedburdicked@Yahqo.com
Subject:
ProjectNo. 24'7'424
observation of Excavation, Proposed shop Building, 7441cowtty Road 301,
Garfield County, Colorado
Ed:
As requested, a representative of Kumar & Associates, lnc. observed the excavation at the
subject site on October 3l,zaz4to 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 August lz,2uT4,ProjectNo.24-7'424'
The proposd shop building has been designed to be supported by spread footings placed on
the natural rocky soils and sized for an allowable bearing pressure of 2,000 psf'
At the time of our visit to the site, the foundation excavation had been cut in one level from
about % footto 4 feet below the adjacent ground surface. The soils exposed in the bottom of
the excavation consisted of clay in the shallow cut, northwest part and basalt rocky soils in the
remaining area. Itwas recofllmended to lower the bearing level to the rocky soils throughout or
replace the sub-excavation depth with compacted structural fill such as CDoT Class 6 road base'
we returned to the site on November 8 and observed road base had been placed and compacted'
Two in-place density tests taken on the road base were 138.7 pcf at 5.7oi moisture and 139.1 pcf
at S.lo/omoisture which indicate adequate compaction. No free water was encountered in the
excavation and the soils were slightly moist to moist'
The rocky soils exposed in the excavation and compacted structural fill are suitable for support
of spread footings designed for the recommended allowable bearing pressure of 2,000 psf'
f*r" disturbed soils in the footing areas should be compacted prior to placing concrete' Other
recommendations presented in our previous report which are applicable should also be observed'
The recommendations submiued in this letter me 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 anv variations encountered in the excavatiot:
Ed Bakcr
Noveinber 8,2A24
Page2
conditions forpossible changes to recommendations contained in this letter. Our services do
not include determinirrg 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 ofpractice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, lnc.
Steven L. Pawlak,
SLPlkac
a 15222
zI
Kumar & Associates, lnc, a Proiet l$o. 2$7-424