PITTSBURGH, Pennsylvania, Nov. 21 -- The office of the U.S. Attorney for the Western District of Pennsylvania issued the following news release: The Justice Department and the Environmental Protection Agency (EPA) today announced two settlements with oil and gas operators in the commonwealth of Pennsylvania. In separate agreements, XTO Energy Inc. (XTO) and Hilcorp Energy Company (Hilcorp) agreed to resolve alleged Clean Air Act and Pennsylvania Air Pollution Control Act violations involving th  more