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More Clean Up at 55 Gedney

Orange and Rockland stated in a press release on March 17, 2014. “O&R begins ramping up this week on the final phase of its project to clean up the coal tar residue at the former manufactured gas plant site at 55 Gedney Street in the Village of Nyack.”

The plant, which extracted gas for lighting and cooking from coal and oil, was owned by a predecessor company of O&R. The predecessor company closed its doors over 50 years ago, and its building has long-since been demolished. But, residue from the process remains underground, along the shoreline and in the sediments adjacent to the four-acre, vacant, riverside lot owned by Athene Annuity and Life Assurance Company.

O&R already has successfully cleaned up the upland part of that lot. In 2005 through 2006, O&R excavated and trucked out more than 20,000 tons of impacted soil and replaced it with clean fill on the western part of this site.
In 2006 and 2007, O&R solidified the coal tar residue located in soils along the river on the eastern part of the site and entombed these in an underground cement monolith — a process known as ‘in situ solidification.’ When the work was complete, the site was covered with clean topsoil, 2-feet-deep, and restored to a park-like setting.

The new work will take place under a large, tent-like, fabric structure equipped with an air-handling and carbon-filter air treatment system. These air-handling devices will be shrouded with sound-dampening equipment.

The excavated soil and sediments will be loaded onto tractor-trailers whose tires will be cleaned of any ground soil before leaving the site.

The excavated soil and sediments will be trucked for treatment and disposal to an approved, licensed facility in Keasbey, N.J.