San Francisco County Transportation Authority — Moving the City

San Francisco County Transportation Authority
Moving the City

Central Subway

Tunnel boring machines
A tunnel-boring machine, similar to those shown above, will make its way from 4th and Harrison Streets to Stockton and Clay Streets.

Background

The second phase of the Third Street Light Rail Project will extend service north from King Street along Fourth Street, enter a tunnel near Harrison Street, cross beneath Market Street, and run under Stockton Street to the intersection of Stockton and Clay streets in Chinatown. A surface station will be built near Bryant Street, and underground stations will be built at Moscone Center, Union Square, and at Stockton and Clay streets in Chinatown. The baseline budget for the project is $1.578 billion

2011 was another successful year for the Central Subway Project in which Final Design proceeded in parallel with Early Construction. During 2011, the project team concentrated on the deliverables required for obtaining a Full Funding Grant Agreement (FFGA) from the FTA, which is scheduled for early 2012. The FFGA represents the federal government's commitment of New Starts funds to the project, planned to be about $942 million, and is a necessary step for the project to pro­ceed to implementation. On January 18, the MTA Board approved the new full-funding plan for the project for submittal to the FTA, completing a major milestone. In February 2011, the project once again received a medium-high rating from the FTA on its New Starts Report.

Work continued on the three final design contracts-tunnels, stations, and systems. The tunnels design was completed in February an advertised for bids on February 28.  The Stations design reached 90% completion in December. Simultaneously, the Systems contract reached 60% complete. The three station construction packages are scheduled to go out for bid in the first quarter of 2012 and the Systems construction package are scheduled to go out to bid in the second quarter.

The first construction package-Utilities Relocation 1-for the relocation the Moscone Center and at the tunnel portal site under the Interstate-80 Freeway, is now complete. Utility Relocation 2, in the area of the Union Square station, reached 75% complete at the end of the year, with substantial completion expected in May 2012.

The tunnels contract was awarded in June 2011, to the Joint Venture of Barnard/Impregilo/Haley in the amount of $233.9 million, $13 million below the engineer's estimate.  The tunnels contract, also known as Contract 1252, is the first major construction contract for the project.  It consists of 1.5 miles of twin-bore tunnels underneath Fourth Street and Stockton Street, from I-80 to North Beach. Its major components include Tunnel Boring Machine (TBM) procurement, construction of the TBM launch box and cross passages; construction of extraction shaft and portal; and monitoring and protection of existing utilities, buildings, and BART tunnels. SFMTA gave notice to proceed to the contractor in December.

Work also progressed in the area of Real Estate acquisition, where agreements were reached for the acquisition of two properties and easements for three properties. SFMTA also proceeded with the relocations, where eleven of nineteen households and three out of eight businesses have been relocated. Also in 2011, the San Francisco Arts Commission awarded contracts to the six selected artists (two for each of the stations) who will provide the principal art pieces for the $15 million public art program for the project.

The Full Funding Grant Agreement from the FTA is expected in February 2012 and revenue service is scheduled for December 2018.

TIMELINE

Timeline for Central Subway

See the MTA's Central Subway Facebook page for more information and photos.

 
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