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World Trade Center Station - South Boston Piers Transitway

Waterproofing design and supervision
Estimated cost: Commencement:
December 30, 1996
Completion date:
October 22, 1998
Boston, MA
United States
Technical data:

PVC membrane waterproofing for 150 ft (64 m) of Cut & Cover tunnel, an open cut station and 300 ft (91 m) of boat section. Waterproofing details for over 400 foundation piles and 380 conduit penetrations in groundwater were developed.

Geology description:

Silty sand overlaying moderately plastic, organic silt to 18 ft (5.5 m). Below this, layers of uniform fine grey and yellow brown sand and silty sand to a depth of 39 ft (12 m), beneath which is moderately plastic, medium stiff olive grey clay. High water table.

Service areas:
Station Profile and Section showing Waterproofing System at Base Slab and Walls
View of Construction Site
Installation of Waterproofing Membrane at Base Slab
Geotextile underlying the PVC Membrane
Welding the Membrane Pieces and fixing the Water Barriers
Installation of Waterproofing System on vertical Walls
Installation of Waterproofing System on Top of Cut & Cover Tunnel