HomeMy WebLinkAboutExcavation of Observation 05.20.16HEPWOFTH-PAWIAK G EOTECH N ICAL
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May 20,2016
Don VanDevrrnder
2074 CR 109
Glenwood Springs, CO 81601
nrri lrash @comcast.net
Job No. I 16 l95A
Subject:Excavation Observation, Proposed Addition, 2074 Road 109, Teller
Springs, Garfield County, Colorado
Dear Mr. VanDevander:
As requested, a representât¡ve of Hepworth-Parvlak Geotechnical, Inc. observed the
excavation at the subject site on May 20,2016 to evaluate the soils exposed for
foundation support. The findings of our observations and recommendations for the
foundation design are presented in this report. The services were performed in
rrccordance with our agreement for professional engineering services to you, dated May
2Q,24t6.
The proposed addition will be supported on isolated spreâd footings placed on the native
sandy gravel soils. The observed footing pads had been constructed and were all 3lÅ' x
3th' or larger. The lc¡undation design had previously been approved by Garfreld County
for a bearing pressure of 1,500 p.sf,
At the time of our visit to the site, the six footing pad excâvations had been cut in one
level from 3 to 7 feet below the adjacent ground surface. The soils exposed in the bottom
of the excavations consisted of silty sandy gravel with cobbles. No free water was
encountered in the excavations and the soils were slightly moist,
Considering the conditions exposed in the excavations and the nature of the proposed
construction, spread footings placed on the undísturbed natural gravel soil designed for an
allowable soil bearing pressure of 1,500 psf should be adequate for support of the
proposed addition. The gravel bearing soils should have minor settlement potential.
Backfill placed around the structure should be compacted and fhe surface graded to
prevent ponding within at least l0 feet of the foundation.
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Parker 303'841,-7119 . CcrloralloSprings il9-631-5562 . Sílverthonre 9?0-4ó8-1989
Don VanDevander
May 20,2016
Page2
The recommendations submitted in this letter ilre based on our observation of the soils
exposed within the footing pad excavations and do not include subsurface exploration to
evaluate the subsurface conditions within the loaded depth of foundation influence. This
study is b¡sed on the assumption that soils beneath the footings have equal or better
support than those exposed. Variations in the subsurface conditions could increase the
risk of movement.
If you have any questions or need further assislance, please call our office.
Sincerely,
HEPWORTH - PAWLAK CEOTECHNICAL INC.
Steven L. Pawlak, P ta
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