Mealey's (January 30, 2019, 11:22 AM EST) -- WASHINGTON, D.C. — A federal judge in the District of Columbia on Jan. 29 granted motions filed by the state of Oklahoma, two industry groups and a power company to intervene in a suit brought by three environmental groups challenging the U.S. Environmental Protection Agency’s approval of the state’s rule regarding the storage of coal combustion residuals (CCRs), finding that intervention was warranted under Federal Rule of Civil Procedure 24(a) (Waterkeeper Alliance Inc., et al. v. Andrew Wheeler, et al., No. 18-2230, D. D.C., 2019 U.S. Dist. LEXIS 14131)....