HomeMy WebLinkAboutObservation of Excavation 07.10.2019K+A
Kumar & Asssala's1 RM.
Cadathnica' and Materials Engineers
and Eniirenrn rntai Scientists
An Employee Owned Company
5020 County Road 154
Glenwood Springs, CO SP)01
phone: (970) 045-7gg8
lam (9/0) 745-8454
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www,l urnarusa,com
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July 10, 2019
Tito Montes
c/o Palomino Design Build
Attn: Jack Palomino
919 Palmer Avenue
Glenwood Springs, Colorado 81601
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Project No. 18-7-532.01
Subject: Observation of Excavation, Proposed Residence, 46921 Highway 6, Canyon
Creek, Garfield County, Colorado
Gentlemen:
As requested, a representative of Kumar & Associates observed the excavation at the subject site
on July 9, 2019 to evaluate the soils exposed for foundation support. The findings of our
observations and recommendations are presented in this report. The services are supplemental to
H-P/Kumar (now Kumar & Associates) agreement for geotechnical services to Tito Montes c/o
Palomino Design Build dated August 15, 2018.
H-P/Kumar previously conducted a subsoil study for design of foundations at the site and
presented our findings in a report dated October 12, 2018, Project No. 18-7-532. The proposed
construction is similar to that discussed in the previous report. Spread footings bearing on the
natural soils designed for an allowable bearing pressure of 1,500 psf were recommended for
foundation support with a risk of settlement.
At the time of our site visit, the foundation excavation which was essentially complete had been
cut in one level from about'''/ to 6 feet below the adjacent ground surface. There were minor
cuts at the attached garage slab area. The soils exposed in the bottom of the excavation consisted
of medium dense, silty sand with gravel and scattered cobbles. 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. The risk of settlement is primarily if the bearing soils were to
become wetted and precautions should be taken to prevent wetting. Prior to the footing
construction, all loose disturbed soils should be removed to expose the undisturbed natural soils,
and the subgrade moistened and compacted. Other recommendations presented in our previous
report which are applicable should also be observed.
Tito Montes
July 10, 2019
Page 2
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. 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 our office.
Sincerely,
Kumar & Assi.ia
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David A. Young, P-41: � � �
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Kumar & Associates, Inc. Project No.18.7-532.01