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TEDLAR® bag is used, if the extract is multiphasic, or if the waste <br /> contained an initial liquid phase (see Sections 4.6 and 7.3.1) . <br /> NOTE: An in-line glass fiber filter may be used to filter the material <br /> within the ZHE if it is suspected that the glass fiber filter has <br /> been ruptured. <br /> 7.3. 14 If the original waste contained no initial liquid phase, <br /> the filtered liquid material obtained from Section 7.3. 13 is defined as <br /> the TCLP extract. If the waste contained an initial liquid phase, the <br /> filtered liquid material obtained from Section 7 .3.13 and the initial <br /> liquid phase (Section 7.3.9) are collectively defined as the TCLP extract. <br /> 7.3.15 Following collection of the TCLP extract, immediately <br /> prepare the extract for analysis and store with minimal headspace at 4 °C <br /> until analyzed. Analyze the TCLP extract according to the appropriate <br /> analytical met.hods. If the individual phases are to be analyzed <br /> separately (i .e. , are not miscible) , determine the volume of the <br /> individual phases (to 0.5%) , conduct the appropriate analyses, and combine <br /> the results mathematically by using a simple volume-weighted average: <br /> (V1) (C1) + (V2) (C2) <br /> Final Analyte = <br /> Concentration V1+ V2 <br /> where: <br /> V1 = The volume of the first phases M . <br /> C1 = The concentration of the analyte of concern in the first phase (mg/L) . <br /> V2 = The volume of the second phase M . <br /> C2 = The concentration of the analyte of concern in the second phase <br /> (mg/L) . <br /> 7.3. 16 Compare the analyte concentrations in the TCLP extract <br /> with the levels identified in the appropriate regulations. Refer to <br /> Section 8.0 for quality assurance requirements. <br /> 8.0 QUALITY ASSURANCE <br /> 8.1 A minimum of one blank (using the same extraction fluid as used for <br /> the samples) must be analyzed for every 20 extractions that have been conducted <br /> in an extraction vessel . <br /> 8.2 A matrix spike shall be performed for each waste type (e.g. , <br /> wastewater treatment sludge, contaminated soil , etc. ) unless the result exceeds <br /> the regulatory level and the data are being used solely to demonstrate that the <br /> waste property exceeds the regulatory level . A minimum of one matrix spike must <br /> be analyzed for each analytical batch. As a minimum, follow the matrix spike <br /> addition guidance provided in each analytical method. <br /> CD-ROM 1311- 19 Revision 0 <br /> July 1992 <br />