WMATA YELLOW LINE TUNNEL LINER AND PORTAL WALL REPAIR, 2022 Highlights Project Overview Sovereign was tasked to demonstrate through a field trial that NOH2O® could provide cost- effective sealing of voids at the interface between the steel liner and outer concrete components of the tunnel structure to mitigate water infiltration. Strategy Sovereign designed a demonstration […]
August 29, 2022
MTA Bridges and Tunnels – Verrazano Bridge, 2020 Highlights Project Overview The Verrazzano Narrows Bridge Toll Plaza Utility Tunnel has suffered significant water infiltration since its construction As part of an overall bridge rehabilitation program, Sovereign was tasked to ensure the Toll Plaza Utility Tunnel provides a long-term dry environment for existing and future communication, […]
June 26, 2020
MTACC – 34th Street Hudson Yards, 2016 Highlights Project Overview NYCT’s 34th Street -Hudson Yards Subway Station, which opened to the public in September 2015, was plagued by water infiltration very shortly after its opening. The water leaks impacted the operation of escalators, created slippery walking surfaces and damaged architectural finishes. In 2016, Sovereign was […]
June 26, 2016
NYCT – South Ferry Terminal, 2015 Highlights Project Overview The South Ferry Terminal Complex was severely damaged by Superstorm Sandy in 2012. As a result of the Station being entirely submerged in saltwater, the entire Station underwent a total makeover. Prior to this event, Station enhancements had been completed in 2009. However, water infiltration remained […]
June 26, 2015
NYCT – Steinway Electrical Duct Bench, 2012 Highlights Project Overview The leak mitigation for Steinway Tube involved sealing leaks in the tunnel liner behind the existing electrical duct bench. The duct bench was demolished, and wet spots identified. In areas where the liner consisted of cast-in-place concrete, holes were drilled through the liner to inject […]
June 26, 2012
Dartford Tunnel East – London, England The tunnel, which carries traffic on the M25 London Orbital Motorway under the Thames River, started leaking in several places. Total water make was 350 liters per minute. After several unsuccessful attempts by others to adequately seal the water, Sovereign mobilized in September 1989 to perform a trial sealing […]
September 26, 1989
