SFMTA Tunnels and Underground Stations
The San Francisco Municipal Transportation Agency (SFMTA) is one of the oldest public transit agencies in the country and has operated for 100 years. It now operates buses, light rail vehicles and cables cars on 80 routes throughout the City. SFMTA owns and operates two tunnels (Twin Peaks Tunnel and Sunset Tunnel) that include two underground stations (Eureka Valley Station and Forest Hill Station). These structures were built between 1910 and 1930 and have had little modification since that time. As lead structural engineer for the prime consultant, Biggs Cardosa led a team of engineers and sub-consultants to prepare a seismic evaluation of these structures. The BART Earthquake Safety Program Evaluation Criteria were used, consistent with evaluations that have been completed for BART underground structures that are jointly operated with SFMTA.