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<br />i represent net water losses largely due to the moisture retained <br />in the voids of the ore and the tailings. Makeup water will <br />be obtained from the mine pit dewatering operations to maintain <br />the minimum normal storage volume of three acre-ft in the <br />solution control ponds. As shown in Appendix G, sufficient <br />volume to store anticipated heap draindown and the design storm <br />' is available above the minimum storage level with at least two <br />ft of additional freeboard. <br />' At the end of mine operations, when .all of the heap leach <br />ore has been leached and neutralized, the water in the heap <br />' leach circuit will be removed through the mechan~~sms of pond <br />and sprinkler evaporation (enhanced evaporation) and controlled <br />discharge. These water depletion mechanisms have been <br />incorporated in the water balance analysis includec in Appendix <br />G. For complete details of neutralization and evaporation see <br />Section E.3.3. <br />D.9 Diversions and Sediment Control and Drainage Crossings <br />t D.9.1 Diversions <br />' Surface water diversions will be constructed around the <br />heap leach facilities and the East and West Pit areas. Runoff <br />channels will be constructed at the toe of the waste rock <br />disposal facilities to collect and control sediment generation. <br />All diversions have been designed to handle the discharge from <br />a 100-yr, 24-hr storm without overtopping. <br />Peak flows for each diversion drainage area were found <br />using the WASHED computer program. WASHED calculates peak flows <br />based on SCS unit hydrograph techniques. Appendix H contain <br />a map showing each drainage area and the WASHED printouts for <br />_ each computed peak flow. <br />i <br />D-60 <br />