In a September 2004 complaint, E.P.A. cited the company for improper storage of its baghouse dust, which contained toxic concentrations of lead and cadmium. This dust was generated by furnace operations at the foundry, which manufactures grey iron castings such as storm sewer gratings and manhole covers. Approximately 514 tons of the dust removed from the baghouse -- an air pollution control device -- was stored in a pile, resulting in some dust delivers to the surrounding environment.