HomeMy WebLinkAboutSubsoils Study for Foundation DesignH.PVKUMAR
Geotechnicel Engineering I Engineering Geology
Materials Testing I Environmental
5020 County Road 154
Glenwood Springs, CO 81601
Phone: (970) 945-7988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Denver {HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, Summit County, Colorado
February 7,2018
.Wayne Rudd
0132 Park Avenue
Basalt, Colorado 81621
waynerudd @ hotmail.gom
Project No. 17-7-858
Subject:Recomrnendations for Foundation Design, Proposed commercial Buildings,
Northwest and East Aleas, Cattle Creek Center, Garfield County, Colorado
Gentlemen
As requested, we are plovicling founclation design recommendations for support of the proposed
buildings at the subject site. Hepworth-Pawlak Geotechnical (now H-P/Kumar') previously
evaluated compaction of strttctural fill placed to establish design subgrade levels in the subject
development areas in mainly April and May of 2000 and presented the findings in daily reports
under Job No. 198 819.
Six buildings proposed at the locations shown on Figures 1 and 14, will be pre-engineered metal
structures similar to the existing 4 buildings located between the two current development areas.
The ground surface is gently sloping across each of the ploposed building arcas and relatively
rninor additional glading is expected for the current proposed development. The eastern
proposed bu.ilding shown on Figure 1A is close to the existing fill bench perimeter and adequate
setback from the adjacent downslope will be needed for foundation bearing and slope stability
considerations.
Review of the compaction testing records indicates the structural fill used to develop design
subgrade levels consisted of vadous mixturcs of clay, sand and gravel compacted to at least 95 or - - -
I007o of the maximum standard Proctol density and is up to about 8 feet deep. To our
knowledge, the cuuent site grades ale essentially the sarlle as when the structural fill placement
was completed in May of 2000.
The compacted fill matedals tested at the site should be suitable for snpport of spread footings
designed for an allowable bearing plessru'e of 2,000 psf. We expect that settlement of structurcs
bearing on fill will be about I percent of the fill depth. Footings should be a minimum width of
18 inches for continuous walls and 2 feet for pads with a minimum depth of 3 feet for fiost
protection where needed. Loose distulbed soils in the footing arcas should be removed or
compacted prior to footing construction. The bearing soils should be protected against frost and
concrete should not be placed on frozen soils. 'We should observe the completed footing
excavations for bearing conditions prior to placing concrete.
'W.ayne Rudd
February 7,2018
Page2
The recommendations submitted in this letter are based on our review of the fill soils tested for
compaction and subsurface exploration has not been pelformed to evaluate the subsurface
conditions within the loaded depth of foundation influence. Variations in the snbsurface
conditions l¡elow the excavations could increase the risk of foundation movement. We should be
advised of any vatiations encountered in the excavation conditions for possible changes to
recommendations contained in this letter. Our services do not include determining the plesence,
ptevention or possibility of mold or other biological contaminants (MOBC) developing in the
fltture. 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 onr office.
Sincerely,
I.I-F+ KUM,AR
Steven L. Pawlak, P.
Rev. by: DEH
SLP/ksw
Attachments: Figures 1 and 1A - Site Plans of Northwest and East Building Aleas
1.ËÊh3
H-PTKI'ÍVIAR
Project No. 17-7-858
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