HomeMy WebLinkAboutAlternative Foundation Design Report 04.26.19RECEIVED
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ûeotæhnical and Mater¡ål$ Enginsers
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APR 2 I 2019 5o2o county Road 154
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COMMUNITY DEVELOPMENT tax: iSzO) g4s-A454
email: kaglenwood@kumarusa.com
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Subject
Offìce Locations; Ðenver (HQ),.Parker, Colorado Springs, Fort Collins, Glenwood Spríngs, ånd Summit Çounty, Colorado
April26,2019
Heyl Construction
Attn: Dave Heyl
65ó0 County Road 335
New Castle, Colorado 81647
d.hevl@heylcivjl.com
Project No. 19-7-117
Foundation Alternative, Proposed Residence, Lot 3, Block 1, Oak Meadows 3, TBD
Oak Crest Drive, Garfield County, Colorado
Dear Dave:
Based on conversations with you and Tyler Maier with Tamarack Grove Engineering, we are
providing recommendations for an alternative foundation désign for the subject property. lVe
previously provided a subsoil study report for foundation design for the subject property dated
February 5, 2079, Project No. 19-7-1 I 7.
As an alternative to designing for a minimum dead load pressure which was previously
recommended, we recommend sub-excavating 3 feet of the nah¡ral clay soils below design footing
grade and replacing the clay with structural fill. The other recommendations contained in the
previous report should be followed.
DESIGN RECOMMENDATIONS
FOUNDATIONS
Considering the subsurface conditions encountered in the exploratory boring and the nature
of the proposed construction, we recommend the residence be founded with spread footings
bearing on a minimum of 3 feet of compacted structuralfill below footings with a risk of
movement, mainly if the bearing soils become wet.
1) Footings placed on the compacted structural fill should be designed for
an allowable bearing pressure of 3,000 psf. Based on experience, we expect
initial settlement of footings designed and constructed as discussed in this
section will be about 1 inch or less. Additional differential movements of about
Yz lo 1 inch could occur if the underlying clay soils are wetted'
2) The topsoil, sub-excavation depth and any loose or disturbed soils
should be removed below the foundation area. The exposed soils in footing
areas after sub-excavation should then be moistened and compacted.
Structuralfill should consist of cDor class 6 3Á -inch road base compacted to
at least 98o/o oî standard Proctor density within 2% of optimum moisture
content. The structuralfill should extend laterally beyond the footing edges
equalto at least %the fill depth below the footing.3) A representative of the geotechnical engineer should evaluate the fill
placement for compaction and observe all footing excavations prior to
concrete placement to evaluate bearing conditions.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
Daniel E.
Rev. by: SLP
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cc: Tamarack Grove Engineering - Tyler Maier tlvler.maier(@tamarackgrove.com
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Kumar &Associates, lnc.Project No. 19-7-117