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25 <br /> Weight of waste to charge ZHE = x 100 <br /> percent solids (Section 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 /> waste was required in Section 7.1.3, proceed to Section 7.3.6. If <br /> particle size reduction was not required in Section 7.1.3, proceed to <br /> Section 7.3.7. <br /> 7.3.6 Prepare the waste 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 Section 7.1.3. Wastes and appropriate reduction equipment <br /> 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 /> 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 <br /> is recommended as an acceptable alternative. Surface area <br /> requirements are meant for filamentous (e.g. , paper, cloth) and <br /> similar waste materials. Actual measurement of surface area is not <br /> recommended. <br /> When the surface area or particle size has been appropriately <br /> altered, proceed to Section 7.3.7. <br /> 7.3.7 Waste slurries need not be allowed to stand to permit the <br /> solid phase to settle. Do not centrifuge wastes prior to filtration. <br /> 7.3.8 Quantitatively transfer the entire sample (liquid and <br /> solid phases) quickly to the ZHE. Secure the filter and support screens <br /> onto the top flange of the device and secure the top flange to the ZHE <br /> body in accordance with the manufacturer's instructions. Tighten all ZHE <br /> fittings and place the device in the vertical position (gas inlet/outlet <br /> flange on the bottom) . Do not attach the extract collection device to the <br /> top plate. <br /> NOTE: If waste material (>lq of original sample weight) has obviously <br /> adhered to the container used to transfer the sample to the ZHE, <br /> determine the weight of this residue and subtract it from the <br /> sample weight determined in Section 7.3.4 to determine the weight <br /> of the waste sample that will be filtered. <br /> Attach a gas line to the gas inlet/outlet valve (bottom flange) <br /> and, with the liquid inlet/outlet valve (top flange) open, begin applying <br /> gentle pressure of 1-10 psi (or more if necessary) to force all headspace <br /> CD-ROM 1311- 16 Revision 0 <br /> July 1992 <br />