The team constructed multiple components simultaneously, including two buildings, five pump stations, ten bridges and an elevated freeway extension. Kiewit led the team devising a plan to cast tunnel segments off site and then tow them by tug-fleet to the project dock for installation. Much of the soil was contaminated with lead. Kiewit employed an EPA-approved chemical to treat contaminated soil and keep contaminants from leeching into the surrounding water.
After treatment with the chemical, further tests were conducted to confirm correct application. With passing test results, the material was deemed suitable for use on site as fill, avoiding the requirement and cost to dispose of waste off site.
To construct the tunnel approaches, the team constructed a large deep-well dewatering system, performing field testing to determine design parameters and sizing requirements for the water treatment facilities.
The edges of the tunnel on land bear almost no sign of the continuous flow of traffic below. It was among of the largest public works projects of the New Deal era, and represented the most advanced tunnel engineering techniques of its day. It consists of twin tubes carrying an aggregate of four traffic lanes, and is 6, feet long. The former US President Franklin Roosevelt was the first person able to drive through the completed tubes. The Midtown Tunnel has responded to Presidential involvement in its welfare by providing a high-capacity, all-weather and most reliable link between Manhattan and Queens for over 6 decades.
It is natural that a construction of such dimensions, nature and intense use, will need major maintenance.
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