HomeMy WebLinkAboutAddendum to Soils Reportrcnffiffiffifi-*
An Erndoyca Ornod ComPonY
5020 C'ounty l{oad 154
(ilenrvood Springs. CO 81601
lrhone: (970) 945-7988
lax: (970) 945-8454
ernai I : kaglenwood(q)kumarusa.coln
www. kumarusa.cont
Ofllce locations: I)enver (HQ), Parker. Cololado Springs, Rrri Collins, Gletrrvood Springs. and Sunrnrit Cotrrlty, Colorado
January 9,2024
Peak 3 Construction
Attn: Jeff Claflin
310 Market Street
Basalt, Colorado 81621
ieff@peak3aspen.com
Project No. 23-7-516
Subject: Addendum to Subsoil Study Report for Proposed Gammill Residence, Lot 54,
Filing 8, Aspen Glen, 567 Saddleback Road, Garfield County, Colorado
Gentlemen:
As requested, we are providing updated design recommendations 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 October 19,2023, Project No. 23-7-516. We have
been provided the grading plan by Sopris Engineering and the foundation plans by DB Structural
Design for our current review and report addendum.
The proposed residence will be above crawlspace and the garage will be slab-on-grade. Spread
footings placed on 3 feet of compacted structural fill and sized for an allowable bearing pressure
of 2,000 pfrere recommended for the foundation support. Cut depths for the footing bearing
teiet witt UEapproximately 3 to 5 feet below the existing ground surface, leaving about 9 feet of
clay soil above the dense gravel soil. The building construction is planned to start in roughly one
month. The onsite clay soils or imported CDOT Class 6 base course are being considered as the
structural fill to support the foundation.
The winter conditions will be more challenging to achieve proper compaction of the clay soils
than base course due to the much gteater amount of water needed to achieve optirnum moisture
content for efficient compaction during the winter Ileezing conditions. Typically, the structural
fill is in 8 to l0-inch-thick lifts for either material but the base course can usually be
compacted at below optimum and still achieve speci fied compaction and therefore require less
time than clay soil to compact. The allowable bearing pressure for the interior footing pads can
be taken as 2,500 psf if desired but the perimeter footings should stay with 2,000 psf. In our
opinion, the risk of initial and post-construction settlement is minor, up to around I inch in our
experience, with the structural fill below footing option since the upper 3 to 4 feet of natural soil
appears to have the higher risk of movement and will be essentially removed by the excavation
for the building foundation. Other recommendations presented in our previous report which are
applicable, especially those for proper surface grading and drainage, should also be observed.
Peak 3 Construction
January 9,2024
Page2
If you have any questions or need further assistanc,e, please call our office.
Sincerely,
Kumar & Associates, lnc.
Steve,n L. Pawlak, P.
Rev. by: DEH
SLPlkac
cc:Peak 3 Construction- Bryant Ragan Oryant@Beak3aspen.com)
DB Structural Design - Nate Decker (@@db!d.@)
5222
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Kumar & Associates, lnc. o Projec't No.23-7-516