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The EPA published an Advance Notice of Proposed Rulemaking (ANPRM) regarding possible revisions to the Resource Conservation and Recovery Act (RCRA) subtitle D part 258 regulations for municipal solid waste (MSW) landfills that may provide regulatory flexibility to encourage accelerated waste decomposition in the presence of water. In light of advances in landfill technology the EPA is considering whether to revise part 258 to create new national standards for the management of liquids in "wet" landfills and bioreactor landfills, including the possibility of removing the prohibition on the addition of bulk liquids, to foster accelerated waste decomposition. Through the ANPRM, the EPA requested information and data on the performance of bioreactor landfills and wet landfills, including information on appropriate liquids management. In addition, the EPA requested comments on whether new national standards for bioreactor landfills and wet landfills are appropriate, and if so, what regulatory changes the EPA should consider in developing any proposal.