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The proposed rule would amend the Commission's regulations to clarify the regulations in 10 CFR part 40, appendix A, "Criteria Relating to the Operation of Uranium Mills and the Disposition of Tailings or Wastes Produced by the Extraction or Concentration of Source Material From Ores Processed Primarily for Their Source Material Content," to better ensure groundwater protection at in situ leach uranium recovery facilities. The proposed rule would codify practices currently done through license condition to provide the industry and public with more predictability during the licensing process. The rulemaking is being delayed while the U.S. Environmental Protection Agency considers revision of the requirements in 40 CFR part 192 (which provide the standards for NRC's byproduct regulations).