A federal judge will hear arguments on whether Exxon Mobil Corp. owes another $100 million to remove oil remaining on the Prince William Sound shoreline from the 1989 Exxon Valdez tanker spill, according to the Associated Press. U.S. District Judge Russel Holland scheduled the arguments in Anchorage in response to a motion filed by retired University of Alaska professor Rick Steiner, who is trying to force action on a claim filed in 2006 by the state and federal governments. The claim says the oil is degrading too slowly and continues to harm wildlife. Irving, Texas-based Exxon argues it doesn''t owe any more money. It paid $900 million in restitution in a 1991 settlement. But the settlement also had a clause allowing the state and federal governments to later claim up to $100 million more from Exxon if there were unforeseen damages from the spill.