Caldecott Fourth Bore - TunnelCast
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Paula Wallis reports for TunnelTalk

December 2011: The largest roadheader working in the USA today holed through to complete the topheading excavation of the Caldecott Fourth Bore NATM tunnel. Two of seven cross passages on the following bench work are also complete. The $420 million project received $197 million under the provisions of President Obama's American Recovery and Reinvestment Act of 2009, commonly known as Federal stimulus funds. It is the largest Recovery Act allocation in the nation to date. The tunnel is scheduled for completion in late 2013-early 2014.

Snapshot

Caldecott Fourth Bore Project

Location:
Oakland, California
Tunnel:
1,033m long x 12.58m wide (3,389ft x 41.25ft) with seven cross passages connecting the third and fourth bores.
Type:
Road tunnel
Owner:
California Department of Transportation (Caltrans)
Contract Value:
$215 million
Method:
NATM
Contractor:
Tutor-Saliba
Designer:
Jacobs Associates
Construction Management:
Parsons Brinckerhoff / Gall Zeidler Consultants JV
Roadheader:
Aker Wirth T3.20
Caldecott bid opening - TunnelTalk, Oct 2009
Caldecott groundbreaking - TunnelCast, Jan 2010
Caldecott digging begins - TunnelTalk, Aug 2010