On March 29, 1990 (55 Federal Register 11798), EPA promulgated a rule to revise the existing toxicity characteristics, which are used to identify those wastes which are hazardous and thus subject to regulation under subtitle C of the Resource Conservation and Recovery Act due to their potential to leach significant concentrations of specific toxic constituents. With this June 29, 1990 Federal Register notice, EPA makes corrections to the rule in order to ensure consistency of the toxicity characteristic leaching procedure, Method 1311, with other methods contained in Test Methods for Evaluating Solid Waste (Physical/Chemical Methods), SW-846 and to clarify the section on quality assurance. This notice also corrects several errors in the March 29, 1990 notice.

• Federal Register: Corrections to Ensure Consistency of the Toxicity Characteristic Leaching Procedure and to Clarify the Quality Assurance Section Final Rule (PDF)(13 pp, 2 MB, June 29, 1990)