Environmental Dredging, Processing & Post Dredge Capping Placement

Location: Tappan Zee Bridge, Tarrytown, NY
Owner: NYS Thruway Authority
Completion Date: January 1, 2014
Categories: Construction, Environmental Dredging

As a subcontractor to Tappan Zee Constructors, Weeks Marine performed mechanically dredge, using an environmental bucket, to create a construction access channel for the Tappan Zee Bridge Replacement project located on the Hudson River in New York.

Weeks was responsible for dredging, dewatering, transporting, in barge processing, mechanically offloading material for upland disposal, and capping of the dredged area with armor stone. The dredging was divided into 2 phases; Phase 1 consisted of 800,000 CY and Phase II 150,000 CY.

Phase I was the largest dredge material processing and upland placement project performed in the shortest timeframe ever performed in the New York Harbor. Weeks successfully completed Phase I on time.

The capping consisted of placing approximately 270,000 CY of armoring material. Capping was performed using a barge mounted conveyor in conjunction with a Material Handler that loaded the conveyor. The capping was installed in two armor layers, one layer consisting of sand and the second layer consisting of ¾” stone.

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