Three environmental organizations in Texas plan to sue in federal court Valero Energy for violations of the Clean Air Act at the Port Arthur, Texas, refinery during what the groups said were “hundreds of so-called “emission events” that have occurred since May 2014. Environment Texas, Sierra Club, and the Port Arthur Community Action Network (PA-CAN) notified Valero and the Premcor Refining Group—which own and operate the Valero Port Arthur Refinery—of their plans to sue the oil companies. Under federal law, citizens…