The EPA (also, "the Agency" or "we" in this preamble) is granting a petition submitted by USG Corporation (USG), Chicago, Illinois, to exclude (or "delist"), on a one-time basis, certain solid wastes that are interred at an on-site landfill at its American Metals Corporation (AMC) facility in Westlake, Ohio from the lists of hazardous wastes. This landfill was used exclusively by Donn Corporation, the original site owner, for disposal of its wastewater treatment plant (WWTP) sludge from 1968 to 1978. After careful analysis, the EPA has concluded that the petitioned waste is not a hazardous waste when disposed of in a Subtitle D landfill. Today's action conditionally excludes the petitioned waste from the requirements of the hazardous waste regulations under the Resource Conservation and Recovery Act (RCRA) only if the waste is disposed of in a Subtitle D landfill which is permitted, licensed, or registered by a State to manage industrial solid waste.