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<br />Some of the mine inflow may be consumed underground during normal <br />operations. However, during periods of downtime, all of the mine inflow will be <br />pumped to the surface and discharged into East Salt Creek. For the purposes of <br />projecting the effect mine discharge will have on East Salt Creek, it will be <br />assumed the maximum mine flow rate is 77 gpm or 0.17 cfs. <br />The qualify of the mine-water as presented in the Hydro-Geo report indicates it is <br />of bicarbonate, sulfate type with a relatively low concentration of total dissolved <br />solids (1,526 - 3,260 mg/I), and a pH of 8.2 - 8.95. The following table presents <br />the impact the mine water discharge would have on the total dissolved solids in <br />East Salt Creek above the McClave Canyon Mine (SW-1) at various flow rates: <br />PHC East Salt 1994 & 1995 Cree k SW-1 <br />East Salt <br />Creek Flow <br />CFS TDS - Mg/I <br />SW-1 Mine Flow <br />cfs TDS - Mg/I <br />Mine TDS - Mg/I <br />Combined °k Increase <br />(Decrease) <br />1.40 3680 0.17 3260 3634.50 1.236 <br />2.40 3210 0.17 3260 3213.30 0.103% <br />3.00 3620 0.17 3260 3600.70 0.533 °h <br />3.87 1750 0.17 3260 1813.50 3.63% <br />4.10 2820 0.17 3260 2837.50 0.621 <br />8.60 2460 0.17 3260 2475.50 0.630% <br />8.95 1420 0.17 3260 1454.30 2.416% <br />10.93 1140 0.17 3260 1172.50 2.848% <br />The quarterly data for SW-1 for the period 1994 and 1995 is sorted by ascending <br />flow rate. The impact is slightly greater as the flow rate in the creek increases. <br />However, the impact the mine water will have on East Salt Creek is minimal to <br />non-existent. <br />Appendix N 3 1/24/02 <br />