HomeMy WebLinkAboutObservation of Excavation 06.26.2020lcrtmm,msËü'*"
An Erploycc Ormcd Compony
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kumarusa.com
www.kumarusa.com
Office l¡cations: Denver (HQ), Parker, Colorado Springs, Fod Collins, Glenwood Springs, and Summit County, Colorado
June26,2020
Kendrick Development, LLC
Attn: Wes Cole
430 Ironbridge Drive
Glenwood Springs, Colorado 81611
wcole@ironbrid eeclub. com
ProjectNo. 18-7-255.4
Subject: Observation of Excavation, Proposed Residence, Lot 294,konbndge,l4l1 River
Bend Wuy, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on June 16, 2020 to evaluate the soils exposed for foundation support. The findings
of our observations and recommendations for the foundation design are presented in this report.
V/e previously conducted a subsoil study for design of foundations at the site and presented our
findings in areport dated January 27,2020, ProjectNo. 18-7-255.01.
The residence will be supported on a structural slab and about 3 feet of compacted structural fill
imposing a maximum allowable bearing pressure of 1,500 psf.
At the time of our visit to the site, the perimeter foundation trench excavation was mostly
completed and had been cut in one level from 3 to 6 feet below the adjacent ground surface. The
soils exposed in the bottom of the excavation consisted of sandy silt and clay. The floor slab
area had been compacted and mainly consisted of the previously placed fill material encountered
in the exploratory boring. 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 stuctural slab foundation designed for the recommended
allowable bearing pressure of 1,500 psf. Compacted structural fill consisting of %-inch road
base is proposed to be placed below the perimeter foundation grade beam walls. The backfill
material was tested for compaction with the acceptable results presented under separate cover.
The onsite excavated soils are also suitable for use ar¡ structural fill. 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
Kendrick Development
Jvne26,2020
Page2
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 futrne. If the client is concerned about MOBC, then aprofessional in
this special field of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates, Inc.
Steveir L. Pawlak, P
SLP/kac ?
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Kumar & Associates, Inc. @ Projec{ No.18.7-255.4