As a chief element of the MBTA’s Silver Line providing service between Boston’s Logan Airport and South Station, this project provided a new transit station and running tunnel segments. Station and tunnels were constructed using cut-and-cover construction techniques.
Gall Zeidler Consultants provided the contractor with a leak detection and remediation grouting procedure for the waterproofing compartments at the station and east tunnels. The waterproofing system comprised two layers of geotextile with a PVC membrane in between, as well as a water-bar compartmentalization system.
South Boston, Massachusetts
Bus and Railway Station and Tunnels
2,200 feet (670 meters)
20 feet and 8 inches (6.3 meters)
Fill and Silt; Marine Clay (Boston Blue Clay); Groundwater Table Above Tunnel Roof
Approximately $94 Million
J.F. White Contracting Company
Massachusetts Bay Transportation Authority (MBTA)