For decades, paper mills dumped waste into the Kalamazoo River. The waste contains polychlorinated biphenyls , or PCBs. People can be exposed to PCBs by eating fish from the river. The chemicals can cause cancer, and other health effects. The biggest concentration of the waste is a 1.5-million-cubic-yard pile in a residential area in Kalamazoo, nicknamed Mount PCB . Now, the Environmental Protection Agency says it will release a feasibility study of the options for the pile by September. For a little perspective, this study was supposed to come out as far back as April 2011.