Chemetco Inc., a privately held secondary copper refiner, is planning to close its smelter in East Hartford, Illinois and file for Chapter 11, according to market sources...Another source familiar with the situation said she understood that Chemetco's problems with toxic-waste dumping was it's ultimate undoing. In October last year, a federal judge fined Chemetco $3.8 million for installing a secret pipe and illegally dumping hazardous metal-filled water into a local creek for a decade.