MBTA Boston – 4 Stations, 2019


Project Overview

Boston’s MBTA Wayfinding Improvement and Station Rehabilitation program called for leak remediation at several underground subway stations below and adjacent to historical buildings and structures. Downtown Crossing, China Town, State Street and Haymarket Stations have several entrances as well as below-grade passageways and stairways that connect the Orange, Red, Blue and Green subway lines. Water leaks have resulted in partial closures of these passageways and stairways during and after rain events.


Sovereign conducted individual site investigations and historical research to develop a multi-phased plan to stop water infiltration into areas which have high public access that were pre-selected by the MBTA. 


All pre-selected areas were treated with NOH2O® which created an impermeable water barrier along the outer boundaries of the targeted structures, at interfaces between adjacent structures, as well as selected areas where single point grout injections were completed to ensure that the client’s expectations were exceeded.

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