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average annual tonnage for the project of 125,000 tons per year. Therefore, this <br />consumptive use will be 44.27 acre-feet perms. This use will only occur for the years <br />during which mining occurs. It is far below the level of evaporation from the lake <br />surface, therefore it does not count in the worst case calculations. <br />2) Evaporation will occur as a result of pumping water into the sediment pond and exposing <br />this water to the surface. Most of the water will seep back into the ground, but the surface <br />area of the pond will add approximately 0.4 acres. Using the rate calculated of 3.11 acre- <br />feet per acre, this results in a use of 1.24 acre-feet perms. <br />3) Consumptive use for road dust control will be minor since the access road will be <br />primarily maintained with magnesium chloride and/or water as needed. Under very dry <br />conditions and high truck traffic, water may be used. This is estimated at 2.58 acre-feet <br />per year. <br />The total consumptive use during mining is 48.09 acre-ft. <br />Gehrman Pit October 09 G-4