A federal jury in New York City ruled Exxon Mobil Corp had polluted the city's ground water and ordered the oil giant to pay $105 million in damages...The city contended Exxon knew that gasoline additive methyl tertiary butyl ether would contaminate ground water if it leaked from the underground storage tanks at its retail stations...Royal Dutch Shell , BP, Chevron, Citgo Petroleum Corp, Hess Corp and Sunoco have previously settled claims against them for a total of $15 million, the city said.