High amounts of a toxic chemical are being discharged into the Congaree and Cooper rivers from plastics factories in South Carolina, but state and federal regulators are doing little to control the pollution, a new report says. High amounts of a toxic chemical are being discharged into the Congaree and Cooper rivers from plastics factories in South Carolina, but state and federal regulators are doing little to control the pollution, a new report says. Environment Phys.org – latest science and technology news stories