HomeMy WebLinkAboutObservation of Excavation 12.12.23
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
December 12, 2023
Luis Bailon
4063 County Road 37
Brighton, Colorado 80603
cbailon14@gmail.com
Project No. 21-7-676
Subject: Observation of Excavation, Proposed Residence, Lot 43, Four Mile Ranch,
186 Maroon Drive, Garfield County, Colorado
Dear Luis:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on December 4, 2023 to 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 November 5, 2021, Project No. 21-7-676.
The proposed residence will be a one-story wood frame structure over a walkout basement.
Foundations were designed for an allowable soil bearing pressure of 2,000 psf.
At the time of our visit to the site, the foundation excavation had been cut in four levels from 2 to
6½ feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of silty sand with gravel and cobbles. Results of swell-consolidation testing performed
on samples taken from the site, shown on Figure 1, indicate the soils have low to moderate
compressibility under conditions of loading and wetting. No free water was encountered in the
excavation and the soils were slightly moist to 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 recommended allowable
bearing pressure of 2,000 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. The bearing soils should be protected from frost and
concrete should not be placed on frozen soils. Other recommendations presented in our previous
report 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
possible changes to recommendations contained in this letter. Our services do not include
determining the presence, prevention or possibility of mold or other biological contaminants
(MOBC) developing in the future. If the client is concerned about MOBC, then a professional in
this special field of practice should be consulted.
Kumar & Associates
