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sample from which no additional liquid may be forced out by an applied pressure of 50 psi ) , due to the need to add an amount of extraction fluid equal to 20 times the weight of the solid phase. Charge the ZHE with sample only once and do not open the device until the final extract (of the solid) has been collected. Repeated filling of the ZHE to obtain 25 grams of solid is not permitted. Do not allow the waste, the initial liquid phase, or the extract to be exposed to the atmosphere for any more time than is absolutely necessary. Any manipulation of these materials should be done when cold (4 °C) to minimize loss of volatiles. 7.3. 1 Pre-weigh the (evacuated) filtrate collection container (See Section 4.6) and set aside. If using a TEDLAR® bag, express all liquid from the ZHE device into the bag, whether for the initial or final liquid/solid separation, and take an aliquot from the liquid in the bag for analysis. The containers listed in Section 4.6 are recommended for use under the conditions stated in Sections 4.6.1 - 4.6.3. 7.3.2 Place the ZHE piston within the body of the ZHE (it may be helpful first to moisten the piston 0-rings slightly with extraction fluid) . Adjust the piston within the ZHE body to a height that will minimize the distance the piston will have to move once the ZHE is charged with sample (based upon sample size requirements determined from Section 7.3, Section 7.1.1 and/or 7.1.2) . Secure the gas inlet/outlet flange (bottom flange) onto the ZHE body in accordance with the manufacturer' s instructions. Secure the glass fiber filter between the support screens and set aside. Set liquid inlet/outlet flange (top flange) aside. 7.3.3 If the waste is 100% solid (see Section 7.1.1) , weigh out a subsample (25 gram maximum) of the waste, record weight, and proceed to Section 7.3.5. 7.3.4 If the waste contains < 0.5% dry solids (Section 7.1.2) , the liquid portion of waste, after filtration, is defined as the TCLP extract. Filter enough of the sample so that the amount of filtered liquid will support all of the volatile analyses required. For wastes containing > 0.5% dry solids (Sections 7.1 .1 and/or 7.1 .2) , use the percent solids information obtained in Section 7.1 .1 to determine the optimum sample size to charge into the ZHE. The recommended sample size is as follows: 7.3.4.1 For wastes containing < 5% solids (see Section 7 . 1 . 1) , weigh out a 500 gram subsample of waste and record the .weight. 7.3.4.2 For wastes containing > 5% solids (see Section 7. 1. 1) , determine the amount of waste to charge into the ZHE as follows: CD-ROM 1311- 15 Revision 0 July 1992