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Grand Junction Pipe & Supply Co. <br />Table 4: Pit No. 5 - Depletions Attributed to Consumptive Losses <br />Gunnison River Pits <br />Notes <br />(1) Based on rates shown in Table 1; assumes 0.2 acre free water surface (drainage channels and sump) during the three -year life of the mine <br />and free water surface area of 6.8 acres upon completion of mining and during post operations <br />(2) Mining losses from Table 2 <br />(3) Sum of columns (1) and (2) <br />(4) Lagged depletions to Gunnison River based on Well Pumping Depletion Model software (® 2001, Western Water Consulting, Inc.); <br />Distance river to pond = 130 ft; Distance river to no -flow = 600 ft; Saturated thickness = 19 ft; <br />Hydraulic conductivity = 2117 gaUday /f12; Specific yield = 0.2 <br />Western Water & Lana, Inc. <br />Page 4 of 4 <br />