[JURIST] A federal judge on Tuesday permitted two environmental groups to sue a Texas refinery owned by ExxonMobil Corp. [corporate website] for failing to enforce federal environmental standards. The Sierra Club and Environment Texas [advocacy websites] filed the lawsuit [Reuters report] in December in the US District Court for the Southern District of Texas [official website] against ExxonMobil’s Baytown, Texas, refinery and the adjacent chemical plant for allegedly releasing over 8 million pounds of pollutants beyond the levels permitted under…