Bridges to Prosperity McNary Bergeron


The East Side Access project is one of the largest infrastructure projects ever undertaken in New York City. The tunnel begins at Sunnyside Yard in Queens and heads west below the East River through the 63rd Street Tunnel, then curves South under Park Avenue and concludes underneath Grand Central Terminal. Two parallel tunnels were bored along this subterranean eight mile trek. The new LIRR terminal is located 14 stories below the streets of New York City and connected to the existing Grand Central Terminal through a network of 22 elevators and 47 escalators. The new LIRR station includes two parallel caverns (East and West); each housing four tracks. The initial contract was completed by Dragados USA and included the initial excavation of the project which used Tunnel Boring Machines as well as drilling and blasting. The second major contract (CM007) was won by Tutor Perini to complete the fit out of the project. This contract essentially turns the excavations into a three-level terminal with operational rail tunnels.

Our Role

McNary Bergeron was hired by Tutor Perini to perform a redesign of the Smoke Exhaust Plenum located at the top of the Terminal Caverns. The Exhaust Plenum is the main ventilation system in the caverns and is designed to mitigate smoke in the event of a fire within the cavern. This value engineering redesign helped expedite the construction schedule of the plenum as well as lower construction costs. The scope included design of the plenum components as well as erection procedures and lifting/handling frames for the assembled precast members. The plenum was designed as 30 ft. precast wall sections with inspection catwalks cantilevered off the side for overhead inspection of the rail tracks. The wall panels were suspended from the cast in place concrete arch at the top of the cavern and connected with hollow core plank near the bottom of the walls.


Metropolitan Transporation Authority (MTA)


Tutor Perini Corporation (Contract CM007)


GEC (Parsons, STV, Parsons Brinckerhoff JV)

Total Contract Value

$10.2 Billion


Total Project 2007 - 2023
CM007 Contract 2015 - 2023

Data Sheet (pdf)

Current Project List