HomeMy WebLinkAboutB15-0274 Soils report.pdf HHepworth-Pa v Iak Geotechnical,Inc.
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Phone:mi 970-945-7988
HEPWORTH-PAWLAK GEOTECHNICAL Far:970.945-8454
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June 10, 2016
Jana Sobotova
165 Forest Road
Vail, Colorado 81657
jana.sobotova@cimex.cz
Job No. 115 094A
Subject: Observation of Partial Excavation, Grid Lines 4A to 8 and AA to E,
Proposed Residence, Lot 29, Block 7, Vail Village First Filing, 165 Forest
Road, Vail, Colorado
Dear Ms. Sobotova:
As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the
partial excavation at the subject site on June 9, 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. We previously conducted a subsoil study
for design of foundations at the site and presented our findings in a report dated May 21,
2015, Job No. 115 094A. The current observation is in addition to our proposal for
services with you dated April 8, 2015.
The residence has been designed to be supported on spread footings placed on the
undisturbed natural coarse granular soils or bedrock with an allowable soil bearing
pressure of 3,000 psf, based on our previous subsoil study.
At the time of our visit to the site, the foundation excavation at Grid Lines 4A to 8 had
been cut in 4 levels from 4 to 10 feet below the adjacent ground surface and up to roughly
34 feet at the uphill side of the excavation below a permanent soil nail/shotcrete wall.
The bottom of the excavation consisted of fractured to hard siltstone/sandstone bedrock.
It was recommended onsite to Todd Mann to remove the highly fractured rock in a
localized area between Grid Lines 4 to 5 and C to E. The excavation was dry and seepage
was being controlled with subdrains.
The soil conditions exposed in the completed excavation area are consistent with those
previously encountered on the site and suitable for support of spread footings designed
for the recommended allowable bearing pressure of 3,000 psf. Loose and disturbed rock
should be removed in the footing areas to expose the undisturbed bedrock and voids
Parker 303-841-7119 • Colorado Springs 719-633-5562 • Silverthorne 970-468-1989
Jana Sobotova
June 10, 2016
Page 2
created from rock removal should be filled with concrete. 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 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
concerned about MOBC, then a professional in this special field of practice should be
consulted.
If you have any questions or need further assistance, please call our office.
Sincerely,
HEPWORTH—PAWLAK GEOTECHNICAL, INC.
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Steven L. Pawlak, P.a s 16222 : F /
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cc: Berglund Architects mer(adam@berrlundarchitects.co)
Shaeffer Hyde Construction—Todd Mann (ToddM @shaefferhvde.com)
Cimex iNvest, Inc. - Hana Faett (hana.faett@cimex.cz)
Job No, 115 094A HP
GEOtech