Tunnelling completed on Long Island water project

9 February 2024

Tunnelling has been completed on the Bay Park Conveyance Project in New York state.

The wastewater project, aimed at reducing nitrogen pollution in Long Island’s Western Bays by redirecting treated water through a pollution control plant to an Atlantic Ocean outfall, has involved nearly 18km of tunnelling and around 11.5km of sliplining of an abandoned 100-year-old aqueduct pipe.

Working on a design-build contract, Western Bays Constructors, a joint venture of John P Picone and Northeast Remsco Construction, began works in 2021. Fourteen shafts were built and the two micro TBMs were launched in 2022. Twelve tunnelling drives were completed to lay the 1.8m diameter pipe at depths of 6-18m.

Micro tunnelling was chosen for the project to minimise disturbance to surrounding communities, reduce cost and accelerate construction.

“The Bay Park Conveyance Project is one of the most innovative infrastructure projects in the nation and an example of our State’s commitment to securing a healthier and more sustainable future for New Yorkers,” said New York governor Kathy Hochul. “With the conclusion of this phase of work, we are making important progress to ensure Long Island has access to clean water and create healthy and resilient ecosystems.”