FILE - In this Jan. 30, 2009 file photo, an Exxon tanker truck makes a refueling stop at an Exxon station in Arlington, Va. Exxon Mobil Corp. was found liable Tuesday, April 9, 2013, in a long-running lawsuit over groundwater contamination caused by the gasoline additive MTBE, and the jury ordered the oil giant to pay $236 million to New Hampshire to clean it up. (AP Photo/J. Scott Applewhite, File)

Associated Press
FILE - In this Jan. 30, 2009 file photo, an Exxon tanker truck makes a refueling stop at an Exxon station in Arlington, Va. Exxon Mobil Corp. was found liable Tuesday, April 9, 2013, in a long-running lawsuit over groundwater contamination caused by the gasoline additive MTBE, and the jury ordered the oil giant to pay $236 million to New Hampshire to clean it up.  (AP Photo/J. Scott Applewhite, File)
FILE - In this Jan. 30, 2009 file photo, an Exxon tanker truck makes a refueling stop at an Exxon station in Arlington, Va. Exxon Mobil Corp. was found liable Tuesday, April 9, 2013, in a long-running lawsuit over groundwater contamination caused by the gasoline additive MTBE, and the jury ordered the oil giant to pay $236 million to New Hampshire to clean it up. (AP Photo/J. Scott Applewhite, File)
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