The document represents EPA's report to the president and congress summarizing the agency's investigations and recommendations in response to the congressional mandate to undertake a comprehensive investigation of the storage and disposal of hazardous wastes. Reviews the public health, technological and economic aspects of the problem of disposing of hazardous wastes. Details the case for hazardous waste regulation. Discusses implementation issues. Presents findings and recommendations. Appendices include: impact of improper hazardous waste management on the environment, hazardous waste stream data, decision model for screening and selecting hazardous compounds and ranking hazardous wastes, summary of hazardous waste treatment and disposal processes, decision maps for on-site versus off-site treatment and disposal, summary of the hazardous waste national disposal site concept, and the Proposed Hazardous Waste Management Act of 1973. Includes references.