Brian Nearing is reporting for the Times Union PCBs left behind are recontaminating the Hudson River in areas that were dredged, following a cleanup effort by General Electric Co. According to a study commissioned by the environmental group Scenic Hudson, elevated PCB levels are present in dozens of areas where the chemical was dredged from the river bottom and then covered with clean fill during the Superfund cleanup. Study author Remy Hennet said, "The only reasonable conclusion is that the dredged areas have been recontaminated by PCB-laden sediment from non-dredged areas located nearby." The study also identified PCB hotspots in the river, including near Mechanicville and Schuylerville in Saratoga County. GE dredged PCBs from about 40 miles of river bottom between Fort Edward and Troy between 2009 and 2014, leaving about 120,000 pounds of the toxic material along the bottom, including in the navigation channel of the Champlain Canal. GE spokesman Mark Behan disputed the findings. "Our analysis is starkly at odds with these claims," he said. Behan said that the state samples show that PCB sediment levels in the river after dredging "declined as much as 92 percent ...  99.8 percent of the samples showed PCB concentrations below the level at which EPA said dredging was warranted." The report comes as the U.S. Environmental Protection Agency is considering whether to certify that the work satisfied a 2002 cleanup agreement between GE and EPA. Scenic Hudson, along with other environmental groups and the DEC, believe PCB levels in the river remain too high, and want EPA to require GE to expand the cleanup, as well as study the lower Hudson River south of Albany. Read the full story in the Times Union.