Seattle Northgate Link TBM inauguration - TunnelCast

April 2014: At a special commemoration ceremony the refurbished Hitachi Zosen EPBM that will excavate twin running tunnels on the northern section of Seattle Sound Transit’s Northgate light rail extension was unveiled ahead of final pre-launch safety checks. The 6.4m diameter machine, previously used by the same contractor joint venture (Jay Dee/Michaels/Coluccio) for completion of 1.1km of twin running tunnels for Sound Transit’s University Link extension, will launch in June (2014) southwards from the tunnel portal at Northeast 94th Street, all the way through to Washington Station with scheduled maintenance stops at Roosevelt and U-District Stations. The refurbished Robbins machine that will mine the parallel tunnel is scheduled to launch in October 2014.

Seattle Northgate LRT Link bid result - TunnelTalk, May 2013
Seattle pushes on with LRT extensions - TunnelTalk, August 2012


Seattle Northgate Link TBM dedication

Sterling Noren reporting for TunnelCast
Project: Northgate Link LRT, Seattle
Total Cost: US$2.1 billion
Contractor: JCM Northlink JV (Jay Dee/Collucio/Michaels)
Client: Seattle Sound Transit (SST)
Contract Sum: US$440.3 million
Contract Scope: Design-bid-build construction of 5.5km of twin running tunnels; Roosevelt and Brooklyn (University District) cut and cover stations; North tunnel portal
Designer: Jacobs Associates
Geotechnical Consultant: Shannon & Wilson
TBMs: 2 x 6.4m diameter EPBMs (Hitachi Zosen and Robbins), plus reserve EPBM (Mitsubishi)
Scheduled Opening: 2021