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• as tailings accumulate within the disposal area, a percentage <br />of the water remains trapped within the pore space between the <br />tailings particles. <br />With the managed thin layer method of deposition, <br />evaporation will take place throughout the entire cell area <br />during operation. For the analyses, about 50 percent, or an <br />equivalent of one cell, of the area was assumed to be under <br />deposition at any time. Evaporation within the remaining cell <br />areas will result in desiccation of the beach. The evaporation <br />data used was based upon the local station pan evaporation <br />data. <br />In considering evaporation within the seepage collection <br />ponds, shallow lake evaporation has been determined to be <br />equivalent to pan evaporation. The collection pond has been <br />assumed to act as a shallow lake. <br />• D.7.3 Results of Analyses <br />The base case analyses has assumed the data presented <br />on Table D.7-1. Full printouts of the computer model are <br />presented in Appendix I. <br />The quantity of water associated with slurry <br />transportation is approximately 780 gpm at a production rate <br />of 4680 tpd of which an average of 55 percent will be available <br />for return to the mill. This average considers all inflows to <br />the disposal area. <br />D.8 Diversions. Sediment Control and Drainage Crossings <br />The tailings disposal area diversions are discussed in Section <br />D.6.5.5. All other diversion ditches, sediment control structures <br />• and drainage crossings remain unchanged from the approved permit. <br />D-74 <br />