Boom is deployed across the Calumet Sag Channel where a sheen is spotted from an overflight by an aircrew from Coast Guard Air Station Traverse City, Mich., Aug. 27, 2012.The sheen is from a jet fuel spill caused by a ruptured pipeline from Westshore Pipeline near Palos Height, Ill. U.S. Coast Guard photo by Petty Officer 3nd Class John Schleicher.