Central Subway

San Francisco

Owner: San Francisco Municipal Transportation Agency

Prime: Barnard Impregilo Healy Joint Venture

The Central Subway Tunnel Project is in the heart of San Francisco, the San Francisco Municipal Transportation Agency (SFMTA) set out to improve transit options for a densely populated neighborhood known for high public transportation ridership while also furthering business development along the new 1.7 mile (2.75 km) rail line. Building twin subway tunnels is never simple, in mission or in undertaking. Building these subway tunnels under a city that’s been well established since the “Gold Rush” of the 1800’s has meant confronting plenty of structural and historical challenges underground in addition to the soft ground and hard rock soil conditions.   The Barnard Impregilo Healy JV met and completed the challenge.

Ballard was brought in to support hyperbaric needs that included state variances, Cal/OSHA requirements, and most importantly working within a very constrictive work site footprint.  We provided training for the J/V personnel to enter the compressed air environment.  Ballard tunnel support team provided support equipment that included the medical lock and shuttle and support for the equipment lock.  Emergency drills were performed on site.  Hyperbaric interventions were performed by Ballard team members safely and without incident.