An ongoing concern is the IBM facility in East Fishkill, which dumps its wastewater into Gildersleeves Brook, a tributary of Wiccopee Creek. In 2002, the company introduced a new method of chip manufacture on 300 mm silicon wafers. Within four years the plant had become the state's top water polluter by pounds of pollutants in the the plant releases into the creek every day, as production expanded due to demand for the chips, which power the PlayStation 3 video game console, primarily copper, lead and nitrates. In 2004 the company settled a suit brought by local residents who argued that a contractor's dumping of perchloroethylene had led to an increase in cancer and other diseases. Researchers have so far been unable to determine if some phenomena reported downstream, such as increased lead levels in crustaceans, are the result of the IBM discharges.