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A hazardous-waste disposal site in the Town of French Creek has been cleaned up.

The state Departments of Environmental Conservation and Health have announced completion of the Tenneco Station 224 site, the former Tennessee Natural Gas compressor station.

The 206-acre site was added to the registry of inactive hazardous-waste disposal sites in 1989. It was listed as a Class 2 site, meaning it posed a significant threat to health or the environment.

Polychlorinated biphenyls (PCBs) were added to industrial lubricating oils at the station from its beginning in 1959 until the early 1970s. As a result, the soils and drain lines around the station were contaminated with the carcinogenic chemical.

The cleanup, which was started in July, involved filling a major drain line with a mix of clay and cement, excavating all of the PCB-contaminated soils, including those in a separator pond, installing erosion controls around a tributary to French Creek which runs through the site and setting up long-term ground-water and soil-monitoring systems.

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