Silver Line Courthouse Station and East Tunnels Remediation

Massachusetts Bay Transportation Authority

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Construction Support Services:

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 (GZ) 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.

LOCATION:
South Boston, Massachusetts
DATE:
2003
STRUCTURE:
Bus and Railway Station and Tunnels
LENGTH:
2,200 feet (670 meters)
CROSS-SECTION:
Maximum 4,528 square feet (421 square meters)
GEOLOGY:
Fill and Silt; Marine Clay (Boston Blue Clay); Groundwater Table Above Tunnel Roof
COST:
Approximately $94 Million
CLIENT:
J.F. White Contracting Company
OWNER:
Massachusetts Bay Transportation Authority (MBTA)