The Environmental Protection Agency (EPA or Agency) today is granting a petition submitted by United Technologies Automotive, Inc. (UTA), Dearborn, Michigan, to exclude (or ``delist''), conditionally, on a one-time, upfront basis, a certain solid waste generated by UTA's chemical stabilization treatment of lagoon sludge at the Highway 61 Industrial Site in Memphis, Tennessee, from the lists of hazardous wastes in Secs. 261.31 and 261.32. Based on careful analyses of the waste-specific information provided by the petitioner, the Agency has concluded that UTA's petitioned waste will not adversely affect human health and the environment. This action responds to UTA's petition to delist this waste on a ``generator-specific'' basis from the hazardous waste lists. In accordance with the conditions specified in this final rule, the petitioned waste is excluded from the requirements of hazardous waste regulations under Subtitle C of the Resource Conservation and Recovery Act (RCRA). The Agency also proposed to use two methods to evaluate the potential impact of the petitioned waste on human health and the environment: A fate and transport model (the EPA Composite Model for Landfills, ``EPACML'' model), based on the waste-specific information provided by the petitioner; and the generic delisting levels in Sec. 261.3(c)(2)(ii)(C)(1) for nonwastewater residues generated from treatment of the listed hazardous waste F006, by high temperature metal recovery (HTMR). Specifically, EPA proposed to use the EPACML model to calculate the concentration of each hazardous constituent that may be present in an extract of the petitioned waste obtained by means of the Toxicity Characteristic Leaching Procedure (TCLP), which will not have an adverse impact on groundwater if the petitioned waste is delisted and then disposed in a Subtitle D landfill. EPA compared the concentration for each hazardous constituent calculated by the EPACML model to the generic delisting level for that constituent