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• 7.0 SUMMARY <br />This design report was prepazed by Shepherd Miller, Inc. to present analyses and specifications <br />for construction of a spray evaporation system at the Battle Mountain Resources, Inc. San Luis <br />Project. The spray evaporation system was design to provide enhanced evaporation of water <br />originating from the reclaimed West Pit. The goal of the enhanced evaporation system is to <br />lower the current water level in the pit (8,595 feet) by 15 feet to 8,580 feet by the end of <br />September 1999. <br />Given the current water level, the inflow conditions, and the material characteristics in the pit it <br />is anticipated that approximately 44 million gallons of water needs to be evaporated to lower the <br />water level in the pit by 15 feet. Dynamic systems modeling indicates that it will take <br />approximately 88 days to evaporate the 44 million gallons of water. <br />The spray evaporation system consist of a 2-acre lined holding pond, an 9-acre lined spray <br />evaporation azea that drains to the holding pond, and four or five independently controlled <br />• evaporative sprayers roughly evenly spaced to maximize evaporation and collection of non- <br />evaporated water droplets. The spray evaporation system will operate at a maximum evaporation <br />capacity of 400 gpm. <br />The delivery system will consist of the two pumps (4-inch primary suction pump and a 4-inch <br />self-priming booster (secondary) pump), a mainline along the south end of the spray azea, and <br />four or five lateral lines to the independent spray evaporators. <br />A diversion channel that drains downstream from the holding pond berm will divert upstream <br />flows from the high wall on the north side of the evaporation azea. <br />u <br />Battle H/ounrain Resormces, lnc. DRAFT Shepherd ~LIiI(er, /nc. <br />p: uoamn.i p w^~*~Rpm.,dx 7-1 M1lay 2l. 1999 <br />