HomeMy WebLinkAboutObservation of Excavation 08.16.2021rcÄiffiåffifffi*rf'å*"5020 County Road 154
Clenrvood Springs, CO 81601
phone: (970) 945-7588
fax: (970) 945-8454
ernail : kaglenwoocl@kurnanrsa.com
www.kumarusa.conrAn E rFloïcc otrnâd Compony
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenrvood Springs, and Summit County, Colorado
August 16,2A2l
Rigo Hemandez
1140 Home Avenue
Silt, Colorado 81652
rieo@rghinc.net
Project No. 21-7-260
Subject: Observation of Excavation, Proposed Residence, Lot 50, Westbank Mesa,
Huebinger Drive, Garfield County, Colorado
DearMr. Hemandez:
As requested, the undersigned representative of Kumar & Associates, lnc. observed the
excavation at the subject site on August 16,2021to evaluate the soils exposed for foundation
support. The findings of our observations and recommendations for the foundation design are
presented in this report. We previously conducted a subsoil study for design of foundations at
the site and presented our findings in a report dated May 11,202I, Project No.2l-7-260.
The proposed residence will be one and two stories of wood frame construction over a
crawlspace. The attached gar. ;ge will have a slab-on-grade floor. Foundations were designed
for an allowable soil bearing pressure of 2,500 psf and a minimum dead load of 800 psf.
At the time of our visit to the site, the foundation excavation had been cut in 3 levels up to
SYz feetbelow the adjacent ground surface. The soils exposed in the bottom ofthe excavation
consisted of brown, sandy silty clay and whitish, silty gravelly sand. ln the northeast, shallow
portion of the crawlspace, we observed many roots in the sidewall of the excavation adjacent to
footing areas. We ¡ecommended that this organic material be removed from the building interior
below crawlspace grade. No free water was encountered in the excavation and the soils were
slightly moist.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and suitable for support of spread footings designed for the as-designed allowable
bearing pressure of 2,500 psf with a minimum dead load of 800 psf. Loose and disturbed soils
should be moistened and compacted or removed in the footing areas to expose the undisturbed
natural soils. Other recommendations presented in our previous re,port which are applicable
should also be observed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous subsurface exploration at the site. Variations
in the subsurface conditions below the excavation could increase the risk of foundation
movement. We should be advised of any variations encountered in the excavation conditions for
Rigo He,rnandez
August 16,2021
Page2
possible changen to reçommenclations contained in this letter. Our services do not includc
determining the presence, prevention or possibility of mold or other biological oontaminants
(MOBC) developing in the future. If the client is concemed about MOBC, then a professional in
this special field of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associateso Inc.
Daniel E. Hardin, P.
Rev. by: SLP
DEHlkac
24441
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Kumar & Associates, lnc. o Project No. 21-7-260