Northlink Light Rail Line

Seattle - Sound Transit

Project: Northlink Light Rail Line Tunnel

Owner:  Sound Transit, Seattle, WA

Project: The Northlink is an additional expansion to Seattle’s light rail project.  This 4.2 mile extension adds length to the recently completed University Link Tunnel.   Completion of the parallel tunnels had prime contractor JCM Northlink LLC (JV of Jay Dee, Coluccio and Michels) excavating tough glacial till and saturated sands near freeways and other sensitive structures.

Ballard Marine Construction was brought into the project to set up the hyperbaric equipment needed for pressurized interventions.  Compressed air workers of the prime contractor were trained by Ballard staff.  Interventions for inspection and routine cutter changes occurred multiple times on this project.