Crews worked diligently during the day to handle multiple substance leaks. At 10AM, crews responded to the 600 block of East Union Street in West Chester Boro for a report of an unknown substance forming a sheen over water approximately 300 feet long. Crews observed the unknown substance leaking into storm drains. Crews worked to prevent further material from entering the storm drain and turned the situation over to the Department of Environmental Protection. At approximately 3PM, Engine Company 52 crews were again alerted to a substance spill, this time in the 100 block of Middle Alley in West Chester Boro. The incident was called in by West Chester Police who stated that a large quantity of cooking oil had been spilled down the alley, turning the alley into a "sheet of ice" crews responded and later turned the situation over to West Chester Boro crews.