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Home > Environmental Phase II
Phase I Phase II

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The Final Supplemental Environmental Impact Statement/Final Subsequent Environmental Impact Report and Final Section 4(f) Evaluation (Final SEIS/SEIR) for the VTA's BART Silicon Valley Phase II Extension Project is now available here.

Project Description

FTA and VTA have prepared a Final SEIS/SEIR to address environmental effects of VTA’s BART Silicon Valley Phase II Extension Project (See Figure 1). There are two alternatives evaluated in this document in accordance with NEPA: the No Build Alternative and the BART Extension Alternative. The BART Extension Alternative consists of a 6-mile extension of the BART system from the Berryessa BART Station (currently under construction) through downtown San Jose to the Santa Clara Caltrain Station. The alignment would include an approximately 5-mile tunnel, or subway, through downtown San Jose.

Four stations are under consideration: Alum Rock/28th Street, Downtown San Jose, Diridon, and Santa Clara. Two options are currently under consideration for the location of the Downtown San Jose Station (East and West) and for Diridon Station (North and South). Two tunnel construction methodology options, the Twin-Bore Option (two 20-foot-diameter tunnels) and the Single-Bore Option (one 45-foot-diameter tunnel), are under consideration. Depending upon funding availability, initial revenue service on the BART Extension is targeted to begin in 2026.

There are three alternatives evaluated in this document in accordance with CEQA: the No Build Alternative, the BART Extension Alternative, and the BART Extension with Transit-Oriented Joint Development (TOJD) Alternative. The CEQA No Build Alternative is the same as the NEPA No Build Alternative. The CEQA BART Extension Alternative is also the same as the NEPA BART Extension Alternative described above. The additional CEQA BART Extension with TOJD Alternative consists of the 6-mile BART Extension as described above, in addition to TOJD at the four BART stations and two mid-tunnel ventilation structure sites. The BART Extension with TOJD Alternative’s TOJD component does not involve a federal action or federal funding and, therefore, is evaluated only under CEQA.

Purpose (BART Alternative)

The project is intended to achieve the following objectives:
  • Improve public transit service;
  • Enhance regional connectivity by directly linking high-capacity transit for the San Francisco Bay Area’s three largest urban centers;
  • Support transportation solutions that will maintain the economic vitality and continuing development of Silicon Valley;
  • Improve mobility options to local and regional employment, education, medical, and retail centers for corridor residents;
  • Support local and regional land use plans and facilitate corridor cities’ efforts to direct business and residential investments in transit-oriented development.

Associated Needs (BART Alternative)

  • Continuing Rapid Growth in Travel Demand
  • Incomplete Regional Transit Connectivity
  • Support for Transit Investments

Objectives (BART with TOJD Alternative)

  • Proactively facilitate and promote local and regional land use planning;
  • Increase transit ridership;
  • Support the expected population and jobs growth;
  • Encourage higher-density, mixed-use development adjacent to BART stations.




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