Since 2016, the 5-mile tunnel portion of the 6-mile, 4-station planned BART extension through downtown San Jose to Santa Clara has been the most studied and talked about aspect of the project. After extensive due diligence, public review, industry feedback and discussions with Cities and stakeholders on both the twin and single bore tunneling options, the single bore tunnel was selected and approved by both VTA and BART in 2018. While VTA analyzed both tunneling options during the environmental phase, the single bore tunnel is the only option that was selected and received the required federal environmental clearance through issuance of the Record of Decision (ROD) from the Federal Transit Administration (FTA). With the ROD, VTA officially had the green light to move forward with the 4-station, single-bore project. Over the last 18-months VTA, in partnership with BART, the future operator and maintainer of the system, has worked diligently to advance a single bore tunnel configuration with associated underground stations taking into account operational, safety and passenger experience considerations.
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