Notice to Proceed issued for Central Subway

The San Francisco Municipal Transportation Agency (SFMTA) announced initial notice to proceed (NTP) on September 13 for the Central Subway’s largest construction contract, worth USD 233.5 million.

This week the SFMTA will move forward with the first of three NTP authorisations for the tunnelling contract, awarded in June to a joint venture of SA Healy and Barnard. This allows the contractor to proceed with ordering the two TBMs that will be used to construct the 1.7-mile (2.7km) twin bore tunnels for the underground portion of the Central Subway Project.

The contract has three distinct NTP authorisations: NTP 1 (USD 35M) authorises procurement of the 6.4m diameter TBMs, NTP 2 (USD 36M) authorises construction of the tunnel launch box and contractor’s work area and NTP 3 (USD 163M) authorises commencement of tunneling, which includes construction of approximately 8,240ft-long (2,512m) precast concrete segmental lined twin-bored guideway tunnels, construction of five emergency cross passages between bored tunnels and construction of station end walls.

Edward Reiskin, SFMTA director of transportation said, “This tunnelling contract is a major part of opening a dynamic new era in rapid transit for the people of San Francisco and especially for those traveling along the congested Stockton Street corridor.”