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No. 7 Subway Line Extension

The No. 7 Subway Line Extension is a key part of an initiative of the City of New York, the Metropolitan Transportation Authority, and the State of New York to create a development program that will transform this area, known as the Hudson Yards, into a vibrant, transit-oriented mixed-use district.



WSP | Parsons Brinckerhoff led the completion of the conceptual, preliminary and final design services for the subway extension project that will extend the existing No. 7 line southwest by approximately 1.5 miles (2.4 kilometres) from its previous terminus in the vicinity of Times Square to the Jacob K. Javits Convention Center at Eleventh Avenue and West 34th Street. Final design services included civil, structural, geotechnical, architectural, mechanical, electrical, and communications design elements, as well as construction cost estimating and scheduling support services. We also assisted MTA New York City Transit (NYCT) in developing an overall construction program and contract packaging arrangements.

The final configuration comprises approximately 1.5 miles (2.4 kilometres) of running twin tunnels; one underground terminal station constructed in rock; four ancillary/system buildings housing mechanical, electrical and communications systems; and two station entrances serving the new terminal station. The twin tunnels were constructed using a tunnel boring machine (TBM). WSP | Parsons Brinckerhoff’s responsibilities included preparation of final design documents including communications, utilities, structural, geotechnical, drainage, groundwater control, architectural, mechanical, electrical, and environmental engineering designs that were ultimately included in six construction contracts.

To assist in the planning and design process, our team performed soil and rock borings on busy Midtown West streets with restrictive working schedules, complex traffic controls and extensive underground utilities, and we performed extensive surveys of existing conditions including utilities, hazardous materials, existing facilities and structures. WSP | Parsons Brinckerhoff prepared final design documents for an early action “utilities relocation” contract. Design work required significant coordination with various NYCT capital program management groups, as well as third parties that included the New York City Department of Transportation (NYC DOT), the New York City Department of Environmental Protection (NYCDEP), The Port Authority of New York and New Jersey (PANYNJ), the Jacob Javits Convention Center, Con Edison, Amtrak, and private property developers who will have development structures adjacent to, or supported by, the No. 7 Subway Extension facilities. Prior to design, WSP | Parsons Brinckerhoff led the team that prepared a final environmental impact statement for the extension and other developments in the Hudson Yards area.