Central Subway Final SEIS/SEIR

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About this Report

This Supplemental Environmental Impact Statement/Supplemental Environmental Impact Report (SEIS/SEIR) updates information in the Central Subway Project Study Area and focuses on changes to the Central Subway portion of the Third Street Light Rail Project that have occurred since the certification of the 1998 FEIS/FEIR. Proposed changes to the Central Subway portion of the Light Rail Project include: a new segment along Fourth and Stockton Streets between Brannan and Geary Streets as an alternative to use of Third, Harrison, Kearny, and Geary Streets; extension of the planning horizon year from 2015 to 2030; the addition of above ground ventilation shafts for tunnel segments and stations; the use of off-street access to stations; a deep tunnel under Market Street; and the potential extension of a construction tunnel under Stockton Street and Columbus Avenue to the north end of the Project near Washington Square for removing the Tunnel Boring Machine (TBM).

This SEIS/SEIR evaluates three alternatives for the Central Subway Project: a No Project/Transportation Systems Management (TSM) Alternative; an Enhanced EIS/EIR Alternative with an alignment along both Third and Fourth Streets south of Market Street and a shallow tunnel under Market Street, as in the original 1998 FEIS/FEIR; and a Fourth/Stockton Street Alternative with a deep tunnel under Market Street and two design options.

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