HomeMy WebLinkAboutUpdate of Subsoil Study Report 11.17.2023I(hA Kumar & Assoclates, lnc.@
Geotechnical and Materials Engineers
and Environmental Scientists
An Employee Owned Compcny
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
November 17,2A23
IM & AY, LLC
Attn: Sameer Jasani
17774 Preston Road
Dallas, Texas 75252
sameer@tcfuels.com
Project No. 23-7-635
Subject: Update of Subsoil Study Report, Proposed Residence, Lot 65, Ironbridge, 1294
River Bend Way, Garfield County, Colorado
Mr. Jasani:
As requested, we have reviewed the previous subsoil study report for suitability to be used in
design of the cuffent proposed residence at the subject site. The update was performed in
accordance with our agreement for professional services to IM & AY, LLC, dated November l,
2023. Hepworth-Pawlak Geotechnical (now Kumar & Associates) previously performed a
subsoil study for design of foundation at the subject site and presented their findings in a report
dated November 15, 2006, Job No. 106 791. Our update of that report includes a review of the
project site and proposed site plan and building plans, dated September I 1,2023.
Proposed Development: We understand the proposed residence will be a one and two-story
structure above crawlspace and walkout basement level with an attached slab-on-grade garage at
the main level. Grading for the structure is proposed to be relatively minor with cut and fill
depths up to around 10 feet. Structural loadings are assumed to be relatively light and typical of
the proposed type of construction. The exploratory boring locations from the 2006 study report
are shown on the attached Figure 1.
Conclusions and Recommendations: The proposed building type, location and structural
loadings generally appear consistent with those described in the previous report, and the
recommendations presented in the November 15,2006 report with the precautions and
limitations can be used for the site development and foundation design. Spread footings should
be placed on undisturbed natural soils or properly compacted structural fill and sized for an
allowable bearing pressure of 1,500 psf. Structural fill placed for foundation support should be a
granular soil compacted to at least 987o of standard Proctor density at near optimum moisture
content. We recommend onsite observation of excavations for foundation bearing conditions
and testing of structural fill for compaction by a representative of the geotechnical engineer.
The surface of the lot has been disturbed by apparent minor grading possibly as parl of the
subdivision development as described in the previous report. A small depression was noted
during the recent site conditions review for the current report update and is located within the
proposed building footprint as shown on the attached Figure L Small, naturally occuring
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IM & AY, LLC
Nove,nrber 17,2A23
Page2
depressions similar to the one noted on Lot 65 were described in the previous report. Since the
depression falls within the proposed building footprint we recommend the subsurfhce condition
of the depression be evaluated at the time of construction by an exploratory pit dug down to the
underlying dense gravel deposit. We should be onsite at the time of pit excavation for evaluation
of the subsurface profile and the need for further mitigation such as sub-excavation and
replacernent with compacted structural fill.
We will be available for additional consultation when requested. In the meantimg if you have
any questions or need fuither assistance, please call our office.
Sincerely,
Kumar & Associat*s, lne.
Steven L. Pawlak, P.E.
SLP/kac
Attachment: Figure 1-Borings
ct,t52n
Kumar & Associates, lnc. o Projeet No.23.7-635
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