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the criteria, sample specific methods would need to be developed and <br /> employed to measure the surface area. Such methodology is currently not <br /> available. <br /> 7.1.4 Determination of appropriate extraction fluid: If the <br /> solid content of the waste is greater than or equal to 0.5% and if the <br /> sample will be extracted for nonvolatile constituents (Section 7.2) , <br /> determine the appropriate fluid (Section 5.7) for the nonvolatiles <br /> extraction as follows: <br /> NOTE: TCLP extraction for volatile constituents uses only extraction <br /> fluid #1 (Section 5.7.1) . Therefore, if TCLP extraction for <br /> nonvolatiles is not required, proceed to Section 7.3. <br /> 7.1 .4.1 Weigh out a small subsample of the solid phase <br /> of the waste, reduce the solid (if necessary) to a particle size of <br /> approximately 1 mm in diameter or less , and transfer 5.0 grams of <br /> the solid phase of the waste to a 500 mL beaker or Erlenmeyer <br /> flask. <br /> 7.1.4.2 Add 96.5 mL of reagent water to the beaker, <br /> cover with a watchglass, and stir vigorously for 5 minutes using a <br /> magnetic stirrer. Measure and record the pH. If the pH is <5.0, <br /> use extraction fluid #1. Proceed to Section 7.2. <br /> 7.1 .4.3 If the pH from Section 7.1.4.2 is >5.0, add <br /> 3.5 mL 1N HC1 , slurry briefly, cover with a watchglass, heat to 50 <br /> °C, and hold at 50 °C for 10 minutes. <br /> 7.1.4.4 Let the solution cool to room temperature and <br /> record the pH. If the pH is <5.0, use extraction fluid #1. If the <br /> pH is >5.0, use extraction fluid #2. Proceed to Section 7.2. <br /> 7. 1.5 If the aliquot of the waste used for the preliminary <br /> evaluation (Sections 7.1 .1 - 7. 1 .4) was determined to be 100% solid at <br /> Section 7.1 .1.1, then it can be used for the Section 7.2 extraction <br /> (assuming at least 100 grams remain) , and the Section 7.3 extraction <br /> (assuming at least 25 grams remain) . If the aliquot was subjected to the <br /> procedure in Section 7.1.1 .7, then another aliquot shall be used for the <br /> volatile extraction procedure in Section 7.3. The aliquot of the waste <br /> subjected to the procedure in Section 7.1.1.7 might be appropriate for use <br /> for the Section 7.2 extraction if an adequate amount of solid (as <br /> determined by Section 7. 1 .1.9) was obtained. The amount of solid <br /> necessary is dependent upon whether a sufficient amount of extract will be <br /> produced to support the analyses. If an adequate amount of solid remains, <br /> proceed to Section 7.2. 10 of the nonvolatile TCLP extraction. <br /> 7.2 Procedure When Volatiles are not Involved <br /> A minimum sample size of 100 grams (solid and liquid phases) is recommend- <br /> ed. In some cases , a larger sample size may be appropriate, depending on the <br /> CD-ROM 1311- 10 Revision 0 <br /> July 1992 <br />