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• • - - 7.1.3 Determination of whether the sample requires particle-size reduction (particle-size is reduced during this step): Usinq the solid portion of the sample, eval;:ate the s~lfd `~- ;,arti;,le size. Particle- size reduction is required, unless the sol i bas a surface area per gram of material equal to or greater than 3.1 cm , or is smaller than 1 cm in its narrowest dimension (i. e., fs capable of passing through a 5.5 mm (0.315 inch) standard sieve). If the surface aria is smaller or the particle size larger than described above, prepare the solid portion of the sample far extraction by crushing, cutting, or grinding the waste to a surface area or particle size as d?scribed above. ]f the solids are prepared for organfc volatiles extraction, special precautions must be taken (see Step 7.3.6). Note: Surface area Grit=_ria are meant for filamentous (~.o., paper, cloth, and similar) waste materials. Actual measurement of surface area is not required, nor is it recommended. For materials that do not obviously meet the criteria, sample-specific methods would need to be developed and employed to maasure the surface area. Such methodology is currently not available. 7.1.4 Oetermfnation of appropriate extraction fluid: 7.1.4.1 For soils, if the sample is from a site that is east of the Mississippi River, extraction fluid ~1 should be used. If the sample is from a site that fs west of the Mississippi River, extraction fluid #2 should be used. 7.1.4.2 For wastes and wastewater, extraction fluid ~1 should be used. 7.1.4.3 For cyanide-containing wastes and/or soils,. extraction fluid ;s3 (reagent water) must be used because leaching of cyanide-containing samples under acidic conditions may result in the formation of hydrogen cyanide gas. 1.1.5 if the aliquot of the sa.~~ple used for the preliminary evaluation (Steps 1.1.1 - 7.1.4) was determined to be 100% solid at Step 7.1.1.1, then it can be used for the Section 7.2 extraction (assuming at least 100 grams remain), and Che Section 7.3 extraction (assuming at least 25 grams remain). If the aliquot was subjected to the procedure in Step 1.1.1.7, then another aliquot .shall be used for the volatile extraction procedure in Section 7.3. The aliquot of the waste subjected to the procedure in Step 1.1.1.7 might be appropriate for use for the Section 7.2 extraction if an adequate amount of solid (as determined by Step 1.1.1.9) was obtained. The amount of solid necessary is dependent upon whether a - sufficient amount of extract will be produced to support the analyses. If =:= an adequate amount of solid remains, proceed to Step 7.2.10 of the nonvolatile 1312 extraction. 1.2 Procedure when Yolatiles are not Involved A minimum sample size of 100 grams (solid and liquid phases) is recommended. In some cases, a larger sample size may be appropriate, depending on the solids content of the waste sample (percent solids, See Step ).1.1); 1312 - 9 Revision 0 November 1992