Hudson River Cleanup Clash to Echo in U.S.: If EPA [Environmental Protection Agency] scales back PCB dredging plan, environmentalists fear a pattern of future policy rollbacks by Bush. - At the heart of the struggle is whether the General Electric Co. can be forced to clean up the Hudson River, which has become the nation's largest Superfund cleanup site. The company's plants along the river flooded the waterway with more than 1 million pounds of PCBs--chemicals linked to cancer in humans and animals--until the practice was banned by the federal government in 1977.