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Season’s Dredging of New Bedford Harbor Contaminated Sediment Completed
Release Date: 11/07/2006
Contact Information: David Deegan - (617) 918-1017
(New Bedford, Mass. – Nov. 7, 2006) – Last month EPA concluded the third season of full scale dredging of PCB-contaminated sediment in New Bedford Harbor.
This latest dredging effort started in August 2006, focusing on an area east of the former Aerovox facility. Approximately seven acres of sediment were dredged this year, resulting in the removal of about 20,000 cubic yards of contaminated sediment. Dredging activities will resume again in Summer 2007.
The dredged material was pumped directly into a floating pipeline connecting the dredge to EPA’s desanding building located at Sawyer Street, approximately one mile south of the dredged area. Booster pumps, located along the shoreline, helped pump the dredged sediment through the floating pipeline to the desanding facility.
At the desanding facility, coarse material was separated from the finer sediment producing a total of 3,500 tons of sand. A submerged pipeline carried the remaining sediment another 1.4 miles south to the dewatering facility at Hervey Tichon Avenue and Herman Melville Boulevard. At the dewatering facility, specialized presses squeezed the excess water out of the dredged sediment. About 13,454 tons of dewatered sediment were transported off-site mainly by train and disposed of in a licensed PCB-landfill in Michigan. Approximately 20 million gallons of water were treated to stringent standards and then discharged back into the harbor.
In addition to the three seasons of full-scale harbor dredging, many other areas of PCB contaminated harbor sediment have been cleaned up to date, including:
- 19 acres capped in 2005 south of the hurricane barrier;
- seven acres cleaned north of Wood Street in 2002-2003;
- two acres dredged in 2002 for a business relocation;
- five acres of the most highly contaminated sediment dredged in 1994-1995.
The New Bedford Harbor Superfund site includes all of New Bedford Harbor and parts of the Acushnet River and Buzzards Bay. The harbor is contaminated with PCBs, the result of past waste disposal practices at two capacitor manufacturing plants, one on the Acushnet River, the second on the outer harbor. PCB wastes were discharged directly into the harbor, as well as indirectly through the city’s sewer system. EPA added the harbor to its National Priorities List (known as the Superfund list) in 1983, making the site eligible for federal Superfund cleanup money.
Since 1983, EPA has spent more than $220 million in planning, engineering and construction costs for the harbor cleanup. The remaining approximate 240 acres of contaminated sediment, including surrounding wetlands and residential properties, will be processed at the 5-acre dewatering facility in the harbor’s North Terminal. This 55,000 square-foot dewatering facility and surrounding marine bulkhead and rail spur will revert to the city when the harbor cleanup is finished. An estimated 880,000 cubic yards of sediment are slated to be removed, roughly equivalent to 175 football fields each filled three feet deep.
Fish, lobster, quahog and other seafood from New Bedford Harbor and the Acushnet River contain high levels of PCBs, which can cause illness if eaten regularly. In 1979, the Massachusetts Department of Public Health issued restrictions on fishing and lobstering based on health risks from eating fish and lobster from the 18,000-acre New Bedford Harbor and Acushnet River estuary.
More information on EPA's clean up of the New Bedford site (epa.gov/ne/nbh/)
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