A joint venture led by Dragados USA, New York City, and Tutor Perini Corp., Sylmar, Calif., is now able to begin revising its best-value winning bid to build a 1.7-mile, 55-ft-diameter deep bore tunnel beneath downtown Seattle. Tunnel Partners, which also includes Frank Coluccio Construction Co., Tukwila, Wash.; Mowat Construction Co., Kent, Wash.; HNTB Corp., Kansas City; and Spanish firm Intecsa, Madrid, submitted the favored best value proposal with a $1.09 billion bid plus technical credits that totaled 71,577,000, for a resulting best value score of 1,018,123,002, the Washington State Dept. of Transportation announced Dec. 9.
A Supplemental Draft Environmental Impact Statement (EIS) that analyzes the bored tunnel alternative was closed to public comment Dec. 13. The team can now begin tweaking its bid in response to the comments.