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determine whether the solid material requires particle size reduction or <br /> to Section 7.1.2.1 if it is noticed that a small amount of the filtrate is <br /> entrained in wetting of the filter. If the percent solids determined in <br /> Section 7.1 .1.9 is less than 0.5%, then proceed to Section 7.2.9 if the <br /> nonvolatile TCLP is to be performed and to Section 7.3 with a fresh <br /> portion of the waste if the volatile TCLP is to be performed. <br /> 7.1.2.1 Remove the solid phase and filter from the <br /> filtration apparatus. <br /> 7.1 .2.2 Dry the filter and solid phase at 100 + 20 °C <br /> until two successive weighing yield the same value within + 1%. <br /> Record the final weight. <br /> NOTE: Caution should be taken to ensure that the subject solid will not <br /> flash upon heating. It is recommended that the drying oven be <br /> vented to a hood or other appropriate device. <br /> 7. 1 .2.3 Calculate the percent dry solids as follows: <br /> (Wt. of dry waste + filter) - tared wt. of filter <br /> Percent dry solids = x 100 <br /> Initial wt. of waste (Section 7.1 .1 .5 or 7.1 .1.7) <br /> 7.1.2.4 If the percent dry solids is less than 0.5%, <br /> then proceed to Section 7.2.9 if the nonvolatile TCLP is to be <br /> performed, and to Section 7.3 if the volatile TCLP is to be <br /> performed. If the percent dry solids is greater than or equal to <br /> 0.5%, and if the nonvolatile TCLP is to be performed, return to the <br /> beginning of this Section (7.1) and, with a fresh portion of waste, <br /> determine whether particle size reduction is necessary (Section <br /> 7. 1 .3) and determine the appropriate extraction fluid (Section <br /> 7.1.4) . If only the volatile TCLP is to be performed, see the note <br /> in Section 7. 1 .4. <br /> 7. 1.3 Determination of whether the waste requires particle size <br /> reduction (particle size is reduced during this step) : Using the solid <br /> portion of the waste, evaluate the solid for particle size. Particle size <br /> reduction is required, unless the solid has a surface area per gram of <br /> material equal to or greater than 3.1 cm', or is smaller than 1 cm in its <br /> narrowest dimension (i .e. , is capable of passing through a 9.5 mm (0.375 <br /> inch) standard sieve) . If the surface area is smaller or the particle <br /> size larger than described above, prepare the solid portion of the waste <br /> for extraction by crushing, cutting, or grinding the waste to a surface <br /> area or particle size as described above. If the solids are prepared for <br /> organic volatiles extraction, special precautions must be taken (see <br /> Section 7.3.6) . <br /> NOTE: Surface area criteria are meant for filamentous (e.4. , paper, cloth, and <br /> similar) waste materials. Actual measurement of surface area is not <br /> required, nor is it recommended. For materials that do not obviously meet <br /> CD-ROM 1311- 9 Revision 0 <br /> July 1992 <br />