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This reportwas _ as an accountof work slxmsom]by m agencyof the UnitedStates Gov_ Neitherthe UnitedStatesGovemmmtnor any agencythereof, nor any of their employees, makes my wazrmty,expressorimplied, or assumesmy legalfiability orrespons_ility forthe _r_, c_l_i_me._ or usefidnessof my infommiion,al_n'_us, pmdu_ or disclosed, or regesmes thatits use wouldnotinfringeprivatelyownedfights.Referencehereinto my specific commercial product,process, orserviceby tradename,trad_m'k, manufacturer, or otherwise does not _y convlmteor implyits endorsenumt, recommendatkm, orfavoring bythe United Stares Govennn_t ormy agency thereof. Theviews andopinions ofauthors expressed herein donotnecessarily state orreflect those ofthe United States Government orany agmcythereof. This reporthas been reproduced directly from the best evailable copy.

The U.S. Environmental Protection Agency has committed to reexamining its use of the Toxicity Characteristic Leaching Procedure (TCLP). The TCLP was developed to support the Resource Conservation and Recovery Act (RCRA) Toxicity Characteristic (40 CFR 261.24) and to help predict whether toxic constituents of solid wastes would be mobilized upon their contact with municipal waste leachate. The method involves a batch extraction test in which wastes are exposed to an aqueous liquid designed to simulate the solvent properties of municipal waste leachates. The resulting extract (i.e., TCLP leachate) is analyzed for the presence of various organic and inorganic contaminants. This article presents a concept for a new method that addresses a number of critical design criteria. The concept is based on a preliminary method developed by the authors as part of a work group chaired by the American Society for Testing and Materials. 2001 © John Wiley & Sons, Inc.

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