Atlantic Avenue Station Rehabilitation

Rank #14 (Tied)
Cost: $200 million

The Atlantic Avenue Station complex in Brooklyn, owned by the Metropolitan Transit Authority, New York City Transit and the Long Island Rail Road, underwent a $200 million rehabilitation late last year to deal with deterioration, ease crowding and expand passenger traffic.

Encompassing three New York City subway stations and the Long Island Rail Road Flatbush Avenue Terminal, the project included construction of a new concourse beneath four operating tracks and three platforms; extensive underpinning of the existing structure; three new elevators compliant with the Americans with Disabilities Act; and rehabilitation of the station platforms and stairs.

The key components of the Flatbush Avenue LIRR rehabilitation included structural support of the foundations to support a new retail and office building above the station and the reconstruction of track No. 6.

The Atlantic Avenue Station Eastern Parkway line opened in 1908 and serves more than 65,000 passengers a day. The latest rehabilitation project required that its key players minimally impact street traffic and not interrupt station operations.

Joint venture partners di Domenico + Partners and Parsons Brinckerhoff Quade & Douglas Inc., both of New York, faced multiple obstacles throughout all phases of the project. Special design solutions were required, including construction phase limitations and the requirement to keep the station operational during construction.

Coordination was key between two transit agencies (NYCT and LIRR), the Department of Transportation for street traffic issues and other city agencies for utility relocations.

Steel was selected to provide the necessary strength and flexibility for the construction staging. Reinforced concrete was used for the invert slab, walls and stairs.

The underpinning of the existing structure, which is under a busy intersection, was a big task. It included the roof supporting street traffic, fully operational platforms and four subway tracks.

Replacing the narrow passageway under the tracks to improve passenger flow was another hurdle. The new layout has a reconfigured east passageway section, a new west passageway section and a new lower-level concourse connecting them.

The connecting passageway was reconfigured to be ADA-compliant. The west section has an ADA-compliant ramp and elevator, while the east section provides elevator access to the northbound local platform. Glass-paved ceilings provide light from the above platforms.

The team installed steel piles to support the existing roof, platforms and tracks while excavating below them with low-clearance machinery for drilling and pile installation.

Another aspect of the project was the preservation and rehabilitation of the station's kiosk, which is on the National Register of Historic Places. The kiosk was moved temporarily during construction but was returned to its original site with a new glass roof.

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