HomeMy WebLinkAboutReport Addendum for Basement Level Option 09.11.2023t(t,låffififfiffiffú*"
An Employcc Chrttcd Conpony
5020 Counfy Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-84s4
ernail : kaglenwood@kumarusa.com
wwu'.kumarusa.com
Office l,ocations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
September 11,2023
SCIB, LLC
Attn: Luke Gosda
01 15 Boomerang Road, Suite 52018
Aspen, Colorado 8l6l l
luke. gosda@sunriseco.com
Project No. 20-7-785
Subject: Report Addendum for Basement Level Option, Proposed Residence, Lot 38,
Phase 3, Ironbridge, Blue Heron Drive, Garfield County, Colorado
Gentlemen:
As requested, we are providing this report addendum for the proposed residence at the subject
site. We previously conducted a subsoil study for design of foundations at the site and presented
our findings in a report dated February 22,2021, Project No. 20-7-785. We were provided
foundation design drawing for the proposed residence by Colorado Structural Engineering
Services dated August 18,2023.
The residence is similar to that described in our previous report except that a basement level
will underlie the north part of the building with slab-on-grade and crawlspace in the south part.
Spread footings placed on the existing site soils and sized for the recommended allowable
bearing pressure of 1,500 psf were designed for the foundation support.
Based on our review, spread footings placed on the natural soils and sized for the recommended
bearing pressure of 1,500 psf are suitable for the foundation support. An underdrain should not
be provided around the upper level, shallow cut depth foundations. An underdrain should be
provided around the basement level foundation walls (south, east and west) but not the walkout,
north side. A 30 mil PVC liner does not need to be provided below the underdrain provided the
bearing soils consist of the dense gravel. Other recommendations presented in our previous
report which are applicable should also be observed.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar &
Steven L.
SLPlkac
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