Excavation begins in Calif. on Caldecott Tunnel's fourth bore

The $420 million project expected to relieve traffic with additional lanes on Rte. 24 near Oakland

News U.S. DOT August 10, 2010
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Federal Highway Administrator Victor Mendez joined state and local officials yesterday as a huge machine began grinding into the Berkeley Hills, beginning the Caldecott Tunnel's fourth bore.

The $420 million project relies on $197.5 million from the American Recovery and Reinvestment Act (ARRA) to build in two additional lanes on the heavily traveled Rte. 24 near Oakland, Calif., making it the nation's second-largest investment of Recovery Act highway funds.
Of the more than 12,000 highway projects, it is the largest tunnel excavation funded by the Recovery Act. The fourth bore will be the first on the route since 1964.

"This ambitious fourth tunnel allows the state to address long-standing challenges," said Mendez. "Residents and commuters will spend less time driving, and the project is creating hundreds of good-paying jobs for area workers."

Rte. 24's existing three tunnels, which give drivers a total of six lanes, are inadequate for the heavy volume of Bay Area traffic each day. The route serves an estimated 160,000 drivers daily. When completed in 2013, the new 3,389-foot-long tunnel will have 12-foot lanes, shoulders and emergency walkways.
The road header will tunnel west toward Oakland from Orinda to be met in the months ahead by two smaller road headers boring eastward. Work crews will advance from both sides of the new tunnel, excavating and stabilizing small segments as they go, moving one to two yards a day.

Located less than a half-mile from the Hayward fault, the tunnel will be built to withstand an earthquake, as are the existing tunnels, and will include numerous safety features, including seven emergency escape passages to the adjacent tunnel.

Of the more than $26.6 billion in ARRA highway funds available nationwide, California received nearly $2.6 billion for highways, and more than $4 billion in ARRA funding for all transportation projects, which supplements billions more in local and state spending. As of July 30, the state had funded 946 projects, with 455 projects under way and 122 completed.

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