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FILE -  The Marathon Oil Company Detroit Refinery is shown in a Nov. 2, 2005 file photo. Permits have been updated for the Detroit-area steelmaker and an oil refinery, the state Department of Environmental Quality announced Monday, May 12, 2014. The heavy oil upgrade permit for the Marathon refinery in southwest Detroit makes emission limitation adjustments and production adjustments. Some operations will see a decrease in the allowable emissions.(AP Photo/file)

FILE - The Marathon Oil Company Detroit Refinery is shown in a Nov. 2, 2005 file photo. Permits have been updated for the Detroit-area steelmaker and an oil refinery, the state Department of Environmental Quality announced Monday, May 12, 2014. The heavy oil upgrade permit for the Marathon refinery in southwest Detroit makes emission limitation adjustments and production adjustments. Some operations will see a decrease in the allowable emissions.(AP Photo/file)

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