United States
                     Environmental Protection
                     Agency
 Solid Waste and
 Emergency Response
 (OS-305)
EPA 530-F-92-026
October 1992
                     Office of Solid Waste
f/EPA         Environmental
                     Fact  Sheet
                     EPA Revises Quality Assurance Measures
                     For The Toxicity Characteristic Leaching
                     Procedure

                       This rule amends the requirements for sample testing associated
                     with the Toxicity Characteristic Leaching Procedure CTCLP). By
                     removing "spike recovery correction" from the Ust of required quality
                     assurance measures, the TC testing methods will remain consistent
                     with those outlined in EPA's manual on RCRA testing methodology.

        Background
             Subtitle C of the Resource Conservation and Recovery Act (RCRA)
        creates a comprehensive program for the safe management of hazardous
        waste. Under this program, EPA has promulgated criteria for identifying and
        listing hazardous wastes, along with standards for the storage, treatment
        and disposal of those wastes. The guidance document, Test Methods For
        Evaluating Solid Waste, Physical/Chemical Methods, SW-846, was first
        published in 1980 to support the associated testing requirements.
             On February 8, 1990, the
        Agency requested comment on
        proposed revisions to Chapter
        One of the RCRA methods manual.
        The revisions included specific
        mandatory quality assurance
        procedures for all testing conducted
        pursuant to Subtitle C of RCRA,
        and identified "spike recovery
        correction" (see box) as a Quality
        Assurance (QA) requirement.

             On March 29, 1990, EPA
        revised the existing Toxicity
        Characteristic fTC) and replaced the
        Extraction Procedure (EP) Toxicity
        Characteristic Test, with the TCLP.
        On June 29, 1990, the Agency
Spike Recovery Correction
is a procedure used to document
the bias of a method in a given
sample matrix. A known
concentration of a target analyte
is added to the sample prior to
analysis.  Then, during the
analysis, the percentage of
the target analyte detected is
measured. If the analysis detects
less than 100 percent of the target
analyte, then the concentration of
that analyte and other similar
chemicals present in the sample
can be adjusted by that
percentage.

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                    United States
                    Environmental Protection
                    Agency
 Solid Waste and
 Emergency Response
 (OS-305)
EPA530-F-92-026
October 1992
                    Office of Solid Waste
?/EPA         Environmental
                     Fact Sheet
                     EPA Revises Quality Assurance Measures
                     For The Toxicity Characteristic Leaching
                     Procedure

                      This rule amends the requirements for sample testing associated
                     with the Toxicity Characteristic Leaching Procedure (TCLP). By
                     removing "spike recovery correction" from the list of required quality
                     assurance measures, the TC testing methods will remain consistent
                     with those outlined in EPA's manual on RCRA testing methodology.
       Background

            Subtitle C of the Resource Conservation and Recovery Act (RCRA)
       creates a comprehensive program for the safe management of hazardous
       waste.  Under this program, EPA has promulgated criteria for identifying and
       listing hazardous wastes, along with standards for the storage, treatment
       and disposal of those wastes. The guidance document, Test Methods For
       Evaluating Solid Waste, Physical/Chemical Methods, SW-846, was first
       published in 1980 to support the associated testing requirements.
            On February 8, 1990, the
       Agency requested comment on
       proposed revisions to Chapter
       One of the RCRA methods manual.
       The revisions included specific
       mandatory quality assurance
       procedures for all testing conducted
       pursuant to Subtitle C of RCRA,
       and identified "spike recovery
       correction" (see box)  as a Quality
       Assurance (QA) requirement.

            On March 29,  1990, EPA
       revised the existing Toxicity
       Characteristic fTC) and replaced the
       Extraction Procedure (EP) Toxicity
       Characteristic Test, with the TCLP.
       On June 29, 1990, the Agency
Spike Recovery Correction
is a procedure used to document
the bias of a method in a given
sample matrix. A known
concentration of a target analyte
is added to the sample prior to
analysis.  Then, during the
analysis, the percentage of
the target analyte detected is
measured. If the analysis detects
less than 100 percent of the target
analyte, then the concentration of
that analyte and other similar
chemicals present in the sample
can be adjusted by that
percentage.

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