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(sites 4, 5 , 6, 7, 9) , and water samples taken from inaffected <br /> drainages, (sites 2, 3 , 8, 10) . The drainages below the mine <br /> do bear waters slightly higher in total dissolved solids and <br /> alkalynity than the averages for the ccntrol drainages . <br /> In reviewing the monthly reports in Appendix D, it can be <br /> observed that the highest concentrations of ions in the <br /> waters occur during the winter months . It is during this <br /> period that much of the water in the streams is derived from <br /> mine pumpage and from outflow from the alluvial aquifer. <br /> This would be expected, as waters pumped from the mine have <br /> migrated from the surface and have spent considerable time in <br /> residence in the rock mass overlying the mine . During this <br /> residence time, the percolating waters will , to some degree, <br /> leach minerals from the rock mass . Similarly, waters in the <br /> alluvial aquifer pick up ions during their residence in the <br /> alluvium. During the spring and summer, base flows from the <br /> mine and aquifers are diluted with snowmelt thus somewhat <br /> improving the average quality of water sampled. <br /> In addition to the ongoing stream sampling, grab sampling of <br /> discharges at the portals of the L. S . Wood, Bear Creek and <br /> Dutch Creek mines was initiated in 1979 . Results from these <br /> analysis , presented in Appendix E , confirms conclusions drawn <br /> from evaluation of down stream samples . <br /> Water Use <br /> Eight adjudicated water rights lie in the Coal Creek Basin. <br /> 11 <br />