Environmental groups demanded immediate action in response to "revelations of flawed fish data and premature dismantling of equipment used in the historic Hudson River PCBs cleanup project," in a letter sent by Riverkeeper, Scenic Hudson and Hudson River Sloop Clearwater to EPA's Region 2 Administrator Judith Enck on Thursday, according to a prepared statement. GE dumped up to 1.3 million pounds of PCBs in the Hudson between 1947 and 1977. The company has been dredging PCB-contaminated soil from the bottom of the river since 2009 and aims to remove 2.65 million cubic yards of sediment by this fall. Environmentalists and local municipalities want the cleanup to continue beyond that.