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<br />-3- <br />Impacts <br />Mine Inflows <br />Appendix 4 contains the mine inflow studies that were performed on <br />November 10, 1983, and June 28, 1984. <br />It is apparent that some water from Middle Thompson Creek is finding <br />its way into the mine through faults and cracks in the bedrock. Just how <br />much water coming into the mine from the surface is unknown. Amore <br />quantitative analysis will be made in this report in 1985 when the flumes <br />are in place in Middle Thompson Creek. <br />A closer look at the inflow analysis shows that the water coming <br />into No. 1 Mine from North Thompson Creek is negligible. Areas 1, 2, and <br />3A showed little increase between November and June, and stayed at a con- <br />stant flow near 1 gallon per minute, <br />It is difficult to say how much of the water from areas 10 through <br />20 are due to inflows from Middle Thompson Creek and how much is due to the <br />naturally occurring ground water in this area. Again, a more quantitative <br />• analysis will be made in 1985. <br />• The following table shows the volume of water which was discharged <br />to North Thompson Creek from the No. 1 and No. 3 Mines: <br />Total Mine Discharge 10/83 to 9/84 <br />No. 1 Mine <br />No. 3 Mine <br />Treatment Plant (Consumptive) <br />Washer Plant (Consumptive) <br />Dust Suppression (Consumptive) <br />Total Discharge: <br />191.49 acre-feet <br />30.93 acre-feet <br />6.98 acre-feet <br />20.09 acre-fee[ <br />.46 acre-feet <br />194.89 acre-feet <br />As can be seen from this table, much of the water pumped from the <br />mines was allowed to discharge into North Thompson Creek. This is due to <br />the fact that Snowmass Coal Company halted all mining in July of 1984. <br />As will be seen later, this water was of er.tremely good quality and well <br />within our NPDES requirements for discharge. <br />• <br />