New York City Department of Environmental Protection broke ground on the $1.9 billion Kensico to Eastview tunneling and facilities upgrade project in the Westchester County town of Mt. Pleasant.

The centerpiece of the project, the Kensico-Eastview Connection (KEC), will be a 2-mile-long tunnel with a diameter of 27 feet and run 400-500 feet below ground with a capacity to carry as much as 2.6 billion gallons of water each day between Kensico Reservoir and the Catskill-Delaware Ultraviolet Light Disinfection Facility (CDUV) in Eastview.

According to NYC DEP, the main components of the project are;

• A new approximately 2-mile-long, deep rock tunnel between the Kensico Reservoir and the CDUV Facility and the construction of new shafts;
• Subsurface utility easements along the tunnel corridor;
• Construction of a new KEC Screen Chamber;
• Construction of connection tunnels to the new KEC Screen Chamber and modifications to the existing Dike Grade Tunnel;
• Consolidation of the electrical supply to the Kensico Campus and construction of a new electrical building;
• Redevelopment of the Kensico Campus including the relocation of Westlake Drive, regrading of the overall site, a new DEP Police booth, and other security improvements;
• Modifications to the chemical feed system at Delaware Shaft 18;
• Modifications to the existing Catskill Upper Effluent Chamber (UEC) located within and adjacent to the Kensico Reservoir;
• Construction of a new Eastview Connection Chamber and interconnection to the CDUV Facility;
• Management of excavated material from construction;
• Shoreline stabilization efforts along Kensico Reservoir south of the UEC; and
• Mitigation as needed for the project.

https://www.nyc.gov/site/dep/news/24-027/new-york-city-department-environmental-protection-breaks-ground-1-9-billion-water-tunnel-in#/0