HomeMy WebLinkAboutObservation of Excavation 04.18.2022lG{I Hffi,#ffimmii'ftu''*"5020 County Road 154
Glenwood Springs, CO 81ó01
¡rhone: (970) t45-7988
fbx: (970) 945-8454
ernail : kaglenwonrl@kumarusa.oon'r
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Offìce l.ocations: ì ]cnver (l IQ), Parker, Cololado Springs. ]ìort Collins, üle nrvood Springs, and Sunl¡nit County, Clolorado
Apnl 18,2022
Mike Perdue
P.O. Box 476
Parachute, Colorado 8 1 635
@ ProjectNo.20-7-416
Subject: Observation of Excavation, Proposed Residence, 357 County Road 309,
Parachute/Rulison Road, Garfield County, Colorado
Dear Mike:
As requested, a representative of Kumar & Associates, Inc. observed the excavation at the
subject site on April 13, 2022 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 September 23,2020, Project No. 20-7-416.
The residence has been designed to be founded on spread footings placed on the natural soils and
sized for an allowable bearing pressure of 1,500 psf as recommended in orn previous report.
At the time of our visit to the site, the excavation had been cut in two levels from I to 8 feet
below the exterior adjacent ground surface. The soils exposed in the bottom of the excavation
consisted of stiff sandy to clayey silt with scattered basalt gravel and boulders. 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 recommended allowable
bearing pressure of 1,500 psf. Loose and disturbed soils should be removed in the footing areas
to expose the undisturbed natural soils. Other recornmendations 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 limited subsurface exploration at the site.
Variations in the subsurface conditions below the excavation could increase the risk of
foundation movement. V/e 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 concemed about MOBC, then a
professional in this special freld of practice should be consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates
Robert L. Duran, P
Rev. by: DEH
RLD/kac