Central Subway Tunneling Project – Contract 1252

San Francisco

Central Subway Tunneling Project – Contract 1252

Barnard/Impregilo/Healy JV

The $233 million Central Subway Tunnel Project, Phase II of the San Francisco Municipal Transportation Agency’s Third Street Light Rail Program, has been designed to expand the City’s transportation network and increase public access to San Francisco’s Chinatown. This project includes constructing precise, twin, 8,233 lf tunnels to be excavated with two EPB tunnel boring machines (TBMs) and lined with 18-ft diameter precast segments. The work also includes construction of a launch box and portal structure under 4th Street (a city thoroughfare), a retrieval shaft, and headwalls for future stations that the TBMs will mine through prior to station construction.

The first of the two Robbins TBMs, “Mom Chung,” has been successfully assembled and launched, and continues excavating the southbound tunnel. The second TBM, “Big Alma,” was recently delivered to the site and is currently under assembly.

Subcontractor Condon Johnson-Nicholson JV has recently completed the construction of the Moscone Station headwalls and jet-grouting work. They continue work on the compensation grouting program along various locations of the alignment, and continue with construction of the vertical and battered secant piles and jet grouting which will make up the Union Square/Moscone Station headwalls.

Project Director: Dan Schall; Project Manager: Ben Campbell; Project Superintendent: Mike Hanley; Chief Engineer/DPM: Alessandro Tricamo; Superintendents: Andy Granger, Bill Kiehl, Bob Schaffer, Lynn Twomley, Michael Shough, Eric Smith, Mike Gilbertson and Harlan Davis; Survey Manager: Klaus Herbert; Staff Engineers: Matt Paulisich, Glenn Strid, Jack Sucilsky, Vik Sehdev, Beau Blume, Aaron Abel and Brian Shalk, Safety Manger: Mike Sinon and Quality Manager: Antonio Prado. Information: Ben Campbell, (415) 546-0799, or ben.campbell@barnard-inc.com.