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The mining operation requires water for dust <br />suppression and for use in compaction of earth materials. <br />For the two mining areas combined, this requirement is <br />expected 'to be 37.0 acre-feet per year. In addition, <br />evaporative losses from the ponds are estimated to be 12.3 <br />acre-feet per year. Annual consumptive use is therefore 49.3 <br />acre-feet. <br />During much of the time, the bottom of the pit will be <br />below the water table and will require dewatering.. Estimated <br />pit= inflow rates reach a maximum oP 43.8 acre-feet per year <br />during the fifth year of mining in the N(TCLA EAST mining <br />area. In earlier years, pit inflow rates are expected to be <br />lower because the pits are shallower. The pit-inflow water <br />will be pumped from the pits and allowed to flow into Pond <br />• 007. The water will be used for dust suppression and <br />compaction, will evaporate, or be discharged into Calamity <br />Draw.' <br />The inflow of ground water into the pits may affect <br />surface-water rights in the vicinity of the pits. An <br />investigation of surface £low during lurch, 1988 identified <br />those rights that are fed-by perennial ground-water <br />discharges and which, therefore, are most likely to be <br />affected by pit dewaterinq. Host of these rights are located <br />along Calamity Draw. only those rights upstream of Pond 007 <br />5 <br />GEOTRAMS, iNC. <br />• REV4SEDMARCH2O06 Attachment 2.05.3(3}16-50 <br />