HomeMy WebLinkAboutB14-0224_B14-0224 HP Geotech letter_1419897360.pdf October 29, 2014
Aspen Constructors, Inc.
Attn: Wally Sheata
309 A ABC, Unit G
Aspen, Colorado 8161 1
Job No. 114480A
Subject: Observation of Excavation, Proposed Elevator Addition, Clock Tower
Store Building, 263 East Gore Creek Drive, Vail, Colorado
Dear Wally:
As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the
excavation at the subject site on October 28, 2014 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 for a different proposed building construction and
presented our findings in a report dated February 29, 2008, Job No. 107 0788. The
current observation was conducted according to you agreement for services with Aspen
Constructors dated October 28, 2014.
The proposed construction includes a remodel of the existing building. As part of the
remodel work an elevator is being added to the structure, including an elevator foundation
pit at basement level. Project plans, prepared by Pierce +Frye, dated September 18,
2014, indicate a design soil bearing pressure of 2,500 psf for the elevator pit footing
bearing on natural site soils.
At the time of our visit to the site, the elevator foundation pit excavation had been cut in
one level approximately 5 feet below the adjacent basement level slab grade in the
interior of the building. The soils exposed in the bottom of the excavation consisted of
natural sandy gravel and cobbles. No free water was encountered in the excavation and
the soils were moist.
The soil conditions exposed in the excavation are suitable for support of spread footings
constructed for the assumed design bearing pressure of 2,500 psf. Loose and disturbed
soils should be removed in the footing areas to expose the undisturbed natural soils.
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 including groundwater level fluctuations
Aspen Constructors, Inc.
October 29, 2014
Page 2
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,
H WORTH—PAW AK GEOTECHNICAL, INC.
rt."411‘
James A. Parker, P.E., P.G.
Reviewed by:
r•
job . .•4ce
��y •`� r!�
• r�
63.22 ®'
Steven L. Pawlak, P.E. ;.;
JAP/ksw ' �`'° ' ""
t, lT. Qfg1►l •rAkr)'
,`‘.EOFt.Ca\-\
GaZtech