Reuters: A unit of BP Plc has agreed to pay $15 million to settle Clean Air Act violations related to fires and a leak at its Texas City refinery in 2004 and 2005, the Obama administration said on Thursday. The penalty addresses violations from two fires at the Texas refinery in March 2004 and July 2005 as well as a leak in August 2005, the U.S. Justice Department and Environmental Protection Agency said in a statement. As a result of the fires and leak at the BP Products North America …