HomeMy WebLinkAboutB15-0011_B15-0011 REV1 Open hole report_1430859240.pdf PO Box 464, 101A Airpark Drive #9, Gypsum, CO 81637 Phone (970) 524-0720 Fax (970) 524-0721 www.groundeng.com
Office Locations: Englewood Commerce City Loveland Granby Gypsum Grand Junction
May 4, 2015
Job Name: Wall Street Building –
Addition Footings, Open Hole, Vail,
Colorado.
Job Number: 15-6518
Mr. Mike Losey
Rocky Mountain Construction Group
120 Willow Bridge Road, Suite 7
Vail, Colorado 81657
*** OPEN HOLE***
A representative of Ground Engineering Consultants, Inc. (GROUND), observed the exposed materials at the base
of the excavation for the Wall Street Building Addition footings in the NE corner and south wall on May 1, 2015. At
the bottom of the footing elevation, the exposed materials appeared to consist of silty, clayey sands with gravels
and scattered cobbles that were generally consistent with our experience of the anticipated conditions in this area.
No project geotechnical report has been prepared for the Addition construction. The structural plans, dated January
19, 2015, reference an assumed soil bearing capacity of 2,500 psf. Quantitatively verifying bearing capacity
generally requires access to subsurface and Standard Penetration Test data. A mini-excavator was used to expose
the undisturbed native material in the foundation excavations, and a jumping jack was used to recompact the
foundation subgrade surface.
Based upon the limited amount of available subsurface data, the observed soils are deemed to be potentially
capable of providing an allowable bearing capacity of 2,500 psf; however, the possibility of the presence of weak
subsurface materials resulting in allowable bearing capacities less than 2,500 psf cannot be ruled out from surface
observations only. In the event that quantitative verification of allowable bearing capacity is necessary, drilling and
sampling should be performed.
Sincerely,
GROUND Engineering Consultants, Inc.
Chris Hutto, CET Reviewed by Carl Henderson, P.E.