HomeMy WebLinkAboutEngineer's Letter-Foundation 12.04.23 ● Rifle ● Colorado ● 81650 ● 970-366-8690 ●
Studio M Engineers, LLC
Structural Engineering Consultants
Innovation By Perception
www.mbengineering.elementfx.com
studiom.engineer@gmail.com
December 4, 2023
Re: 152 Rusty Spur Trail
To Whom It May Concern,
As requested by my client, Umberto Murillo, my office was asked to provide a letter of
signoff on a foundation we designed in light of a soils report provided for his project by
Kumar Associates. The report is dated May 4, 2021. The report number is No. 21-7-306.
The report was provided my office by Umberto’s project manager, Monico, on
11/17/2023. This was the first time I was made aware of the report.
Soils Report Summary: In summary, the report recommendations, which were
confirmed as practical by in field observation at the time of excavation by Kumar, require
a 4000 psf max, 1000 psf min allowable soil bearing pressure below footing elements.
The original soil bearing pressure assumption made by my office during our final design
in May of this year was 1500 psf max bearing, with no minimum bearing, in accordance
with IRC 2015 Table R401.4.1.
Analysis Conclusions: After detailed load analysis of the as built condition, it was
determined that a portion of the existing foundation did not satisfy the 1000 psf minimum
dead load bearing pressure requirement stated on page 3 of the Kumar report. The area
that did not conform was the 4 pad footings on the building interior. The pads are
highlighted in the following sketch:
● Rifle ● Colorado ● 81650 ● 970-366-8690 ●
Recommendations: The in place footings in the 4 highlighted locations were cast in
place as 4 foot x 4 foot x 11 inch thick reinforced pads. We recommended that the
owner/contractor cut the installed pads down to a 2ft square profile, narrowing the pad
contact with the subgrade, raising the minimum bearing pressure into compliance with
the 1,000 psf number presented by Kumar. A one page specification for this repair was
issued to the owner (sheet S2.0). The specification is attached to this report for reference.
Observations: The owner began remediation work on the pads on 12/2/2023. Our office
inspected the work on 12/4. The pads were cut to the 2 ft sq. profile recommendation. It
is our understanding that the slab patch will be poured this week.
● Rifle ● Colorado ● 81650 ● 970-366-8690 ●
Conclusion: In summary, the field modification presented in this report, bring the
foundation for 152 Rusty Spur Trail into compliance with the soils report number is No.
21-7-306, produced by Kumar and Associates dated May 4, 2021.
LIMITATIONS:
The areas that I observed were readily accessible using conventional means of
access and observation. Likewise, structural system deficiencies, if any, that are
hidden behind finishes or obstructed from readily available points of visible
would similarly invalidate the conclusions in this report. Such anomalies should
be reported as they are discovered, granted they even exist.
No warranty is either implied or expressed.
This concludes this report. Please contact my office with any questions or comments.
Sincerely,
Michael J. Baca, PE NCEES
Principal, Studio M Engineers LLC
Attachment: Sheet S2.0
Cc: mmridgerunner71@gmail.com