(September 17, 2020, 1:56 PM EDT) -- DENVER — Environmental groups on Sept. 15 filed a petition in Colorado federal court contending that the U.S. Bureau of Land Management (BLM) violated federal law when it approved a resource management plan (RMP) that made nearly 1 million acres of public lands and mineral estate in Colorado's Western Slope available for hydraulic fracturing (Western Slope Conservation Center, et al. v. United States Bureau of Land Management, et al., No. 20-2787, D. Colo.)....