On March 29, 1990, EPA promulgated a rule (55 FR 11798) to revise the existing toxicity characteristics (TC) used to identify certain wastes defined as hazardous; these wastes are regulated under subtitle C of the Resource Conservation and Recovery Act (RCRA) due to their potential to leach significant concentrations of specific toxic constituents. In the preamble, the exclusion from subtitle C regulation for arsenical-treated wood and wood products was revised inappropriately. This rule corrects that revision. Today's rule also deletes two additional references in the Code of Federal Regulations (CFR) to the Extraction Procedure (EP) Toxicity Characteristic and replaces them with references to the TC.

• Hazardous Waste Management System; Identification and Listing of Hazardous Waste; Toxicity Characteristic; Corrections - Federal Register Notice, July 10, 1992 (PDF)(3 pp, 6 K, July 10, 1992, FR Vol. 57, No. 133)