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1 <br />7.3.4.1 For samples containing <59a solids (see Step <br />r ~~ 7.1.1), weigh out a 500 gram subsample of waste and record the <br />weight. <br />' 7.3.4.2 For wastes containing >57. solids (see Step <br />7.1.1), determine the amount of waste to charge into the ZHE as <br />follows: <br />' 25 <br />Weight of waste to charge ZHE = x 100 <br />' percent solids (Step 7.1.1) <br />' Weigh out a subsample of the waste of the appropriate size and <br />record the weight. <br />' 7.3.5 If particle-size reduction of the solid portion of the <br />sample was required in Step 7.1.3, proceed to Step 7.3.6. If particle- <br />- size reduction was not required in Step 7.1.3, proceed to Step 7.3.7. <br />' 7.3.6 Prepare the sample for extraction by crushing, cutting, or <br />grinding the solid portion of the waste to a surface area or particle size - <br />as described in Step 7.1.3.1. Wastes and appropriate reduction equipment <br />t should be refrigerated, if possible, to 4'C prior to particle-size <br />reduction. The means used to effect particle-size reduction must not <br />generate heat in and of itself. If reduction of the solid phase of the. <br />'t waste is necessary, exposure of the waste to the atmosphere should be <br />~- avoided to the extent possible. <br />' NOTE: Sieving of the waste is not recommended due to the possibility that <br />' volatiles may be lost. The use of an appropriately graduated ruler is <br />recommended as an acceptable alternative. Surface area requirements are <br />~ meant for filamentous (e.a•, paper, cloth) and similar waste materials. <br />' Actual measurement of surface area is not recommended. <br />When the surface area or particle-size has been appropriately <br />' altered, proceed to Step 1.3.7. <br />7.3.7 Waste slurries need not be allowed to stand to permit the <br />solid phase to settle. Do not centrifuge samples prior to filtration. <br />7.3.8 Quantitatively transfer the entire sample (liquid and solid <br />phases) quickly to the ZHE. Secure the filter and support screens into <br />' the top flange of the device and secure the top flange to the 2.HE body in <br />accordance with the manufacturer's instructions. Tighten all ZFIE fittings <br />and place the device in the vertical position (gas inlet/outlet. flange on <br />' the bottom). Do not attach the extraction collection device to the top <br />plate. <br />' Note: If sample material (>ly of original sample weight) has obviously adhered <br />to the container used to transfer the sample to the ZHE, determine the <br />weight of this residue and subtract it from the sample weight determined <br />in Step 7.3.4 to determine the weight of the waste sample that will be <br />' filtered. <br />1312 - 15 Revision 0 <br />' November 1990 <br />