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HEPWORTH- PAWLAK GEOTECHNICAL
June 23, 2005
Hepworth- Pawlak Geotechnical, Inc.
5020 County Road 154
Glenwood Springs, Colorado 81601
Phone: 970-945-7988
Fax: 970-945-8454
email: hpgeo @hpgeotech.com
Sonnenalp Resort
Attn: Johannes Faessler
20 Vail Road
Vail, Colorado 81657
Job No. 105 344
Subject: Observation of Excavations, Proposed Hotel Addition, Sonnenalp Resort,
Vail, Colorado.
Dear Mr. Faessler:
As requested, a representative of Hepworth - Pawlak Geotechnical, Inc. observed the
excavations at the subject site on June 16 and 17, 2005 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 geotechnical
studies for design of foundations at the site and presented our findings in reports dated
May 17, 2002 and December 8, 2004, Job No. 102 223.
The proposed addition will consist of a three story structure underlain by a basement and
parking garage. Spread footings sized for an allowable soil bearing pressure of 5,000 psf
were recommended in our previous report.
At the time of our initial visit to the site, we observed the foundation excavations for a
continuous footing located between N and M and 104.5 and 107.3. The foundation
excavation had been cut in one level from 2 to 2 1 /2 feet below slab grade. On June 17, we
observed a continuous footing excavation along Z line between 0 and 106 that had been
cut in three levels between 1 /2 and 2 feet below slab grade. The slab subgrade is up to
about 17 feet below the adjacent ground surface. The soils exposed in the bottom of the
excavations consisted of slightly silty to silty sandy gravel with scattered cobbles.
The soil conditions observed in the excavations are consistent with those previously
encountered on the site and suitable for support of spread footings designed for the
recommended allowable bearing pressure of 5,000 psf. Loose and disturbed soils should
be removed in the footing areas to expose the undisturbed natural gravel soils. Other
recommendations presented in our previous report which are applicable should also be
observed.
Parker 303 - 841 -7119 0 Colorado Springs 719- 633 -5562 • Silverthorne 970 - 468 -1989
Sonnenalp Resort
June 23, 2005
Page 2
The recommendations submitted in this letter are based on our observation of the soils
exposed within the foundation excavations 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.
If you have any questions or need further assistance, please call our office.
Sincerely,
HEPWORTH — PAWLAK GEOTCHNICAL, INC.
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cc: Resort Design Associates International — Attn: Mike Foster
Town of Vail Building Department
Weitz Company — Attn: Brad Church
Job No. 105 344
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