HomeMy WebLinkAboutObservation of Excavation 03.15.2017H-PVKUMAR
Geotedrnlcal Englneerlng I Englneedng Gaology
MatErlals Testing I Envlronmental
5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax (970) 945-8454
Emai[ hpkglenwood@kumarusa.c.om
Otfice Locations: Parker, Glenwood Springs, and Summit County, Colorado
March 15,2017
Dave Carlson
1779 County Road 241
Nerv Castle, Colorado 81647
All.current.electriclâhotmai l.com
Project No. l7-7-l 16-1
Subject:Observation of Excavation, Froposed Residence, Parcel2, Vix Ranch Subdivision
Exenrption, 1779 County Road 241 (East Elk Creek Road), Gar{ield County,
Colorado
Dear Dave:
As requested, a representative of H-PlKurnar obsen'ed the excavation at the subject site on
Marclr 13,2017 1o evaluate tlre soils exposed for foundation suppoñ. The findings of our
observations and recommendations for the foundalion design are presented in this report. The
services are supplemental to our agreement for profèssional services to yott dated January 10,
24t7.
We previously conducted a subsoil study for design of foundations at lhe site and presented our
Iindings in a report dated January 18, 2017, Project No. 17-7-l16. The proposed constn¡ction is
similar to tlrat discussed in our previons report. The building has been designed to be supported
on spread footings sized using an allorvable soil bearing pressure of 2,tû0 psf, as recommended.
At the tinte of our site visit, the foundation excavation rvhich rvas complete had been cul in one
level from about I Y: lo 3V= feet belorv the adjacent ground surface. The soils exposed in the
bottom of the excavation consisted of silty to slightly silty sandy gravel and cobbles rvith srnall
boulders. There tvere a ferv minor pockets of silty sand exposed at subgrade rvithin the gravel
a¡rd cobble deposits, The footings had been constructed and the foundation rvalls rvere being
formed. No free rvater lvas encountered in tlte excavation and tlte soils rvere slightly moisl.
The soil conditions exposed in lhe excavation are consistent rvith those previously encountered
on the site and suitable for support of spread footings designed for the recommended allorvable
bearing pressure of 2,û00 psL Loose and disturbed soils should be removed in the footing åreas
to expose the undisturbed natural granular soils. Other reconlmendations presented in our
prsvious report which are applicable should also be observed.
Dave Carlson
March 15,2017
Page 2
'fhe recommendations submitted in this letter are based on our observation of the soils exposed
withill the foundation excavation and tlre previous subsurface exploralion at the sile. Variations
in the subsnrface conditions belorv the excavation could increase the risk of foundation
rnovement. We should be advised of any variations encounlercd in the excavation conditions for
possible changes to recommendations contained in lhis letter.
Ifyou have an1'questions or need further assistance, please call our office.
Sincerely
H-Pt KUMAR
David A. Young, P
DAYlkac
cc Garfield Count¡' Building. Dept - Jim Wilson {jwitson@gadeld.çounly,gpm)
g2-218
I
H.P*KUMÀR P.ojecl No, 17-7-116-1