HomeMy WebLinkAboutObservation of Excavation 02.10.2022lGrtiffirflffifffiniiiå'*"
An Emdoycc olrncd Compony
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email : kaglenwood@kurnarusa.com
www. kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
February 10,2022
Russell Cartwright
35 Willowview way
Parachute, Colorado I ló35
rusÊecart@gmail.com
Prqect No.2l-7-229.39
Subject: Observation of Excavation, Proposed Residence ,Lot 4, Block l, The Fairways,
Battlement Mesa, 39 Hogan Circle, Garfield County, Colorado
Dear Russell:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on October 25,2021to evaluate the soils exposed for foundation support. The
frndings of our observations and recommendations are presented in this report. The services are
supplemental to our agreement for professional services to you dated March 1,2021.
We previously conducted a subsoil study for design of foundations at the site and presented our
frndingsinareportdatedJuly2l,202l,ProjectNo.2l-7-229. Theproposedconstructionis
similar to that discussed in our report. Spread footings bearing on the natural soils sized using an
allowable bearing pressure of 1,500 psf were designed for foundation support based on the
recommendations in that report.
At the time of our site visit, the foundation excavation which was essentially complete had been
cut in two levels from nil to about 4 feet below the adjacent ground surface. The soils exposed in
the bottom of the excavation consisted of stiff, sandy silt. Results of swell-consolidation testing
performed on samples taken from the site, shown on Figure l, indicate the soils are moderately
compressible under conditions of loading and wetting with a low hydro-compression potential.
The soils are not expansive. No groundwater was encountered in the excavation and the soils
were slightly moist.
The soil conditions exposed in the excavation are generally consistent with those previously
encountered on the site and suitable for support ofspread footings designed for the
recommended allowable bearing pressure of 1,500 psf. There is some risk of settlement if the
bearing soils were to become wetted and precautions should be taken to prevent wetting. Loose
and disturbed soils should be removed in the footing areas to expose the undisturbed natural soils
and the subgrade compacted. 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
Russell Cartwright
February 10,2022
Page2
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'
If you have any questions or need further assistance, please call or¡r office.
Sincerely,
Kumrr &
David A. Young, P
DAYlkac
attachment Figure I Test Results
Inc.
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Kumar & Associates, lnc.6 Project t{o. 21 -7 -229.39
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SAMPLE OF: Sondy Slll
FRÒM: Bollom of NW Porlion of Excovolion
WC = 6.0 %, DD = 95 pcf
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b.
ADDITIONAL COMPRESSION
UNDER CONSTANT PRESSURE
DUE TO WETTING
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21-7-229.39 Kumar & Associates SWELL-CONSOLIDATION TEST RESULT Fig. 1