HomeMy WebLinkAboutObservation of Excavation 10.28.2024l$r1 fiffil,$mfffiffiiT';--'
Arr Hnplope {hrncd Compony
5020 Counlr R<iad 154
$lenwood Springs, CO 81601
phane: {970} I45-"198e
fax: i970) 945-8454
email : kaglenwooet@)J<urrrantsa.com
www.kumargga.e81n
{)ffice l*catians: Denver (FIQ), Parker, Colorado $prings, F'ort Collins, Glenwood Springs, and Sumrnit C.riunty, C'olorado
October 28,2024
Gerald Slafkes
1887 County Road237
Silt, Colorado 81652
s m al, I rv-tt$"d Fqq@gry ai l. cErrrr
Project No.24-7-260
..Subject: Observation of Excavation, Proposed Shop Building, 1887 County Ptoad237,
Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on October 25,2024 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 areport dated May 20,2024, Project No.24'7-260.
The proposed shop building is generally consistent with that described in our previous report and
has been designed to be supported by spread footings placed on the natural soils and sized for an
allowable bearing pressure of 1,200 psf with a risk of settlement.
At the time of our visit to the site, the foundation excavation had been cut in 2 levels from about
3 to 7 feet below the adjacent ground surface with a step down of about lYzfeet from the main
level along the downhill, east side. The soils exposed in the bottom of the excavation consisted
of mainly silty clayey sand with scattered gravel in the northern part and more gravelly silty sand
in the southem part. The excavation bottom was relatively loose and had not been compacted.
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 can be for support of spread footings designed for the recommended allowable
bearing presstre of 1,200 psf with a settlement risk mainly is the bearing soils are wetted. Loose
disturbed soils in the footing areas should be moistened and compacted as recoillmended in our
previous report. Other recommendations presented in our previous report which are applicable,
especially those to keep the bearing soils dry, should also be observed.
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 the recommendations contained in this letter. Our services
Gerald Sla{kes
October 28,2024
Page2
do not include determining the presence, prevention orpossibility ofmold or otherbiological
contaminants (MSBC) 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 funher assistance, please call our office.
Sincerely,
Kurngr & Associatesn
Steven L. Pawlak, P
SLP/kac
a
3
75222
Kumar & Associates, lnc. @ Project Ho.2S7-260