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8 <br />a, Leaching tests on the refuse material were conducted in <br />• rolling-bottles open to the atmosphere. Weighed amounts of dry <br />sample were agitation-leached at a pulp density of 40 percent <br />solids with deionized water. After 24 hours of contact, the <br />solids were filtered, and the filtrate was recovered for subse- <br />quent chemical analysis at Core Laboratories, Inc. The rolling- <br />bottle leaching tests were conducted at a pulp density that <br />would minimize the dilution of solubilized ions but yet maintain <br />thorough mixing and agitation of the solids. <br />Chemical Analysis <br />Chemical analyses of the filtrates or leachate solutions from <br />the three rolling-bottle tests are summarized in table 3. Calcium, <br />magnesium, and sodium were the major cations detected in all three <br />leachatest sulfate ion was the major anion found. Negligible <br />concentrations of trace metals were reported in each leachate. <br />Leachate pH at the termination of each test was slightly alkaline <br />(7.6 - 7.9)t starting pH was 5.7. <br />The leachate solutions profiled in table 3 are surprisingly <br />similar in chemical composition to the present day groundwaters <br />in the area of the existing coal-waste pile (table 2). Both sets <br />of analyses describe slightly alkaline waters that are enriched <br />in calcium, magnesium, and sulfate and defficient in soluble <br />trace metals. <br /> <br />