Spectacle Island, a former city dump, received about 4 million cubic yards of clay, glacial till, and dredge sediment that was excavated in part for the Ted Williams Tunnel and its approaches.

Project Highlights

Spectacle Island

Boston, Massachusetts

• 4 million cubic yards of excavated and dredged spoils successfully barged, received and placed.

• 2,500 linear foot cofferdam along the east side of the island.

• Containment dike along the east side of the island within the cofferdam.

• Drove 240 precast piles for the supply pier and seawall on the west side of the island.

• 600,000 tons of stone rip-rap placed for erosion protection along much of the island's shoreline.

• Bentonite cut-off wall along the west beach and an impervious final cover over the entire island to enclose waste fill and underlying municipal refuse.

• Ended the flow of toxic contaminants which had been flowing into the harbor for decades.