HomeMy WebLinkAboutObservation of Excavation 11.02.21l(+rt l(umar & Associates, lnc. @
Geotechnical and Materials Engineers
and Environmental Scientists
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970)945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.comAn Emdoycc olmcd Compony
Oltce Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit Cormty, Colorado
November 2,202I
Russell Cartwright
35 Willowview Way
Parachuteo Colorado I I 63 5
russecart@gmail.com
Project No. 21 -7-4 41.01
Subject: Observation of Excavation, Proposed Residence, Lot 56, Eagle Point, Battlement
Mesa, 35 Eagles Ridge Drive, Garfield County, Colorado
Dear Russell:
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on October 15,2021to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations are presented in this report. The services are supplement¿l to
our agreement for geotechnical engineering services to you dated l:[l.Íay 12,2021.
We previously prepared a subsoil study for desígn of foundations at.the site and presented our
findings in a report dated JuIy 14,2021, Project No. 21-7-441. The residence will be a single
story wood frame structure over crawlspace with an attached slab-on-grade garage. Spread
footings designed for an allowable soil bearing pressure of 2,000 psf were recommended for
foundation support of the building.
At the time of ow site visit, the foundation excavation which was essentially complete had been
cut in one level from about 3%to 5 feet below the adjacent ground surface. The soils exposed in
the bottom of the excavation consisted of relatively dense, siþ clayey sandy gravel with
cobbles. The results of a gradation analysis performed on a sample of disturbed bulk sample of
the soils (minus 3-inch fraction) obtained from the site are presented on Figure 1. No free water
was encountered in the excavation and the soils were slightly moist.
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 recoflrmended allowable
bearing pressure of 2,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural granular soils, and the subgrade moistened and compacted.
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 foundation
movement. S/e should be advised of any variations encountered in the excavation conditions for
possible changes to recommendations contained in this letter.
Russell Cartvyright
Nôvcmber 2,2021
Page2 .
If you have any questious or need'fltfihêr assistance, pleaso call our office.
Sincerely,
Kumar &
David A. Young. P
DAY/kac
attachment Figure 1 Results
cc: Garfield CountyBuilding Dept. - Jim TWilson (iwilçon@garfiel4-çounly.com)
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Kumal &Asaociates, lnc. o Projec{ No.21.7441.01
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21-7-441.01 Kumar & Associates GRADATION TEST RESULTS Fig. 1
ÇqentíFiagr fe o'f #msruffleflwfroømThe undersigned ser-bifÍes 'bhat 'Jolr"ns l4anvilJ.e Insul¿tion producbs have been insta¡-J,ed inaccorctance with the manufacllure¡s recommend.ecl appli-catj-ons foilbhe$e p-roclucts.B,n*¡ir*pfimr,¡nIl¡rlirü/,[,üiht[GÐ-r]lìUhi'dl'orør*dJllfira¡rfiil Fs¿ülfF¿uor¡sli Fruiuç¡ol5firo¡pøe.li ffiii*i[$logslü_ &ãFStt<ri¡øñxüntlntlm-tr¡lnqllriure lrr¡ielrqmerss *,#trå#ås'in,I l't.2I* 5.5-inüro¡r,ernuare/&rernt fi,iF]*,. sq,ft.-^.1+__*+ùLlsr r.sq.fï'.ÆXfl'Ífç /¡!nic€$'ø[cett i\ar¿)ñJF,ilore)il',q,Ajlporr¿re .@moqn€rVùfl¿üllllsJn"s'q,ft.,-,i;ilH,fgËfrHf ñll_* 3'12,,^.sq.ltrïf6ï'6fr:X;j$":"-,;itî#:ËYr:li:r t¡aTuuble hoiueov,'n$ ilcrpsr*' when this ¡.rroperry ir sotcJ, ihrs cerrír.ïcoie shouJd be pcresecl o. io