A truck spreads sand at the intersection of Baseline Road and Arsenal Road where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
Police redirect traffic away from west bound Arsenal Road where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
Police redirect traffic away from west bound Arsenal Road where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
An Exxon Mobil Joliet Refinery truck heads west on Arsenal Road where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
Police look on toward a plume of smoke or steam rising in the area where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
Police look on toward a plume of smoke or steam rising in the area where there is a possible leak at the Exxon Mobil Refinery in Channahon, Illinois, Friday, October 19, 2012. | Joseph P. Meier~Sun Times Media
CHANNAHON TOWNSHIP — An airborne release of oily substance from the ExxonMobil Refinery spread east as far as five miles away on Friday, shutting down a major road and landing on at least some houses in Elwood. ExxonMobil described the substance as “gasoline and heavier …