On November 7, 1986 EPA finalized the regulatory framework for implementing the land disposal restrictions and promulgated treatment standards and associated effective dates for certain spent solvent and dioxin-containing hazardous wastes. The spent halogenated and non-halogenated solvent wastes subject to the final rule are identified by EPA Hazardous Waste no. F001, F002, F003, F004, and F005. The document (Volume I) provides background information regarding production and use of the restricted solvents, and a discussion of physical and chemical characteristics of F001-F005 solvents that are important with respect to the land disposal restriction regulations and their effects on land disposal. Also included are summaries of the toxicity of each of the F001 through F005 solvents, and a description of incidents in which environmental contamination has occurred due to volatilization or migration of solvents.