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not expected to contribute significantly to the leaching performance. <br />The composite sample was split into samples designated CR -A and CR -B. <br />The weight percent of antecedent moisture was determined by measuring the <br />weight of water lost upon drying for 4 hours at 105'C. <br />The samples were packed into columns approximately 30 cm long and <br />10 cm in diameter. The packing was accomplished by use of a rigid tube <br />attached to a funnel. The tube was given a short -stroke motion that adds <br />solids to the column on the upstroke and provides a degree of compaction <br />on the downstroke. The solid is not allowed to free fall on this method <br />and particle segregation is minimized. <br />The antecedent moisture was displaced by injecting through the <br />bottom of the columns at constant rate using a positive displacement <br />pump. Effluent from the top of the columns was passed through an <br />electrical conductivity (EC) cell and periodically sampled for chemical <br />analysis. <br />The salient parameters of the leach tests are listed in Table 29, <br />Parameters of Column Leach Tests. The materials in each test were;, <br />essentially identical. Note, however, that CR -B was packed somewhat more <br />RN -6 2.05-78 (Repaginated 10/21/16) <br />