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The EPA is considering developing an Advance Notice of Proposed Rulemaking regarding possible revisions to the Resource Conservation and Recovery Act (RCRA) subtitle D part 258 regulations for municipal solid waste (MSW) landfills. The purpose of the revisions would be to 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. The EPA is considering requesting information and data on the performance of wet landfills and bioreactors, including information on appropriate liquids management. EPA is also considering requesting comments on whether new national standards for wet landfills are appropriate, and if so, what regulatory changes the EPA should consider in developing any proposal.