Contents tagged with sr99

  • + What will happen to the tunneling machine now that boring is complete?

    The tunneling machine will be cut into pieces and placed on trucks to be hauled away. Due to roadway restrictions, each truckload will weigh no more than 20 tons. Some components of the machine such as electrical equipment, motors, and pumps may be reused, but most of the machine will be recycled.

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  • + How many lanes will the tunnel have?

    The tunnel will have two 11-foot travel lanes with an eight-foot safety shoulder and a two-foot shoulder in each direction that will ensure enough space for all vehicles and legal size trucks.

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  • + Who will pay for the cost associated with the tunneling machine stoppage?

    In 2014, Seattle Tunnel Partners requested $125 million in additional compensation related to the stoppage. WSDOT denied that request after determining it had no contractual merit. The process for resolving disputes within the tunnel contract is prescriptive. It requires multiple steps by both parties. Should Seattle Tunnel Partners continue to pursue entitlement related to the stoppage, it will take time to resolve. Ultimately, the responsibility for costs associated with the delay will be determined through the project's design-build contract. 

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  • + Did other work continue during the tunneling stoppage?

    Construction at the north and south ends of the SR 99 tunnel continued throughout the stoppage. Crews built ramp and roadway connections at each portal. They also continued work on the operations buildings that will control safety features, lighting and ventilation within the future tunnel. 

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  • + How was the tunneling machine repaired?

    Seattle Tunnel Partners built a 120-foot-deep pit in front of the machine. When the pit was complete, the machine tunneled forward into it. Crews then partially disassembled the machine and made repairs and enhancements. This narrated video (links to YouTube) explains the repair process in detail. The machine mined out of the pit in January 2016 and completed the SR 99 tunnel drive in April 2017.

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