The SR-99 Tunnel Project, part of the Alaska Way Viaduct Replacement Program for the Washington Dept. of Transportation, parallels the waterfront through the south Seattle area and will be constructed utilizing the world's largest-diameter tunnel boring machine (TBM). Boring operations for the 2-mile-long tunnel will commence with the 57.5-ft-dia TBM in the summer of 2013. Malcolm Drilling teamed with the Seattle Tunnel Partners Joint Venture to construct and dewater the TBM launching pit to depths exceeding 85 ft. Additional ancillary work included the support of excavation for several cut and cover roadways along with ground improvement by jet grouting.
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