Mealey's (December 20, 2016, 1:29 PM EST) -- NEW ORLEANS — The U.S. Environmental Protection Agency and its administrator provided a sufficient explanation for its denial of a rulemaking petition filed by environmental groups seeking standards for the amounts of phosphorus and nitrogen that can be discharged into the Mississippi River and waterways leading into the river, a federal judge in Louisiana ruled Dec. 15 (Gulf Restoration Network v. Lisa Jackson, Administrator of the U.S. Environmental Protection Agency, et al., No. 12-677, E.D. La.; 2016 U.S. Dist. LEXIS 173459)....