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Hammer Time: Last TZB Pile Drive Test Today

by Tish Dubow, Mayor of South Nyack

The final pile is scheduled to driven in the middle of the Hudson River just North of the Tappan Zee Bridge on Friday, May 18. It will initially be vibrated in starting around 10a. The piling will then be hammered in the rest of the way starting at around 1p and take about three hours.

This will complete the pile driving. After six or seven weeks, the DOT may strike the piles a couple of more times to see if they have settled but those strikes would be done in a few minutes.

The pile driving is part of a pilot study to gather data for the Tappan Zee Bridge replacement project. They are driving test pilings into the riverbed to test how well they will support the weight of the new bridge. They are driving seven piles in total for the pilot project.

Each pile takes about an hour and a half. They use a combination of vibrating and pile driving to set the piles. They are also testing sound mitigation techniques during the driving. They first measure without any mitigation and then try and measure different techniques. This is why the driving stops and then starts again. DOT has stated that they have noise measuring instrumentation in place at Salisbury Point and they also have a person walking around the village with a hand held device taking measurements.

The DOT contract with the firm doing the work allows them to work from 7 AM to 7 PM seven days per week, but they don’t generally work on Sundays. South Nyack has requested that the DOT instruct the contractor to abide by the village’s restrictions of 8 AM to 7 PM Monday through Friday, with quiet days on Saturday, Sunday, and holidays.

The South Nyack Village Board is deeply concerned about the disturbance this activity imposes on our community. We continue to push the state to minimize the impacts on our residents.

Source: Village of South Nyack

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