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• Al <br /> i <br /> APPENDIX A <br /> DISCUSSION OF GEOCHEMICAL REACTIONS BETWEEN <br /> ACIDIC SEEPAGE AND NATURAL SOILS <br /> ( To aid in understanding the reactions between acidic seepage, <br /> such as the infiltration at Club Mesa , and natural soil /rock <br /> material , the following discussion presents a brief review of the <br /> major reactions , followed by a conceptual model of plume <br /> behavior. This conceptual model has been confirmed by ESI at <br /> uranium, copper, and phosphate operations , in the vadose and <br /> saturated zones , in North America and Australia. <br /> GEOCHEMICAL MOBILITY AND REMOVAL <br /> The mobilization , transport and removal of contaminants from an <br /> acidic waste in a ground water environment involves not only the <br /> movement of ground water,, but a number of geochemical processes. <br /> Numerous investigations have provided an understanding of the <br /> geochemical processes at work in association with acidic uranium, <br /> lphosphate and copper milling operations. An excellent summary of <br /> I the observed mobility is provided by Cherry, Shepherd and Morin <br /> +- (February 14-18, 1982) . Another summary of the processes as they <br /> 1 relate to the phosphate industry was provided by Rouse and <br /> 1 Bromwell (March 1983) . These studies are useful in understanding <br /> i <br /> the geochemical processes underlying phosphate acidulation <br /> waste-disposal operations. The processes are summarized in the <br /> I <br /> following section. <br />