"EPA 950-R-98-020." "April 1998." Cover title. "This technical background document ... was submitted for public review to EPA's RCRA docket # F-97-2P4P-FFFFF. It provides supplementary information and support for the May 12, 1997 supplemental proposed rule, 'Land disposal restrictions phase IV; second supplemental proposal on treatment standards for metal wastes and mineral processing wastes, mineral processing and Bevill exclusion issues, and the use of hazardous waste as fill' (62 FR 26041)"--Page 2. "The Agency has received comments from the public on this document and has listed these comments and Agency responses in the final section of the document. The Agency finalizes this document as of April 1998 and submits it to RCRA Docket # F-98-2P4F-FFFFF to provide supplementary information and support for the April 1998 final rule, 'Land disposal restrictions phase IV: final rule promulgating treatment standards for metal wastes and mineral processing wastes; mineral processing secondary materials and Bevill exclusion issues; treatment standards for hazardous soils, and exclusion of recycled wood preserving wastewaters'"--Page 2. Includes bibliographical references.