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• IV. GROUND L9ATER GROUND WATER ELEVATIONS 47ater levels in the alluvial wells at the Edna Mine have remained constant over the previous years witY. minor fluctuations occurring seasonally. Elevations of the water in the alluvial wells and the West Ridge spoils well are shown in Figure 20. As suggested in the baseline studies, the occurrence of a drawdown in any of the wells is anticipated only during mininy at the base of the slope near Trout Creek. However, no drawdown was noticed at TR- 1.5 during the early 1980's when mining took place on the lower slope of 'Rest Ridge. In reviewing the data, it is interesting to note that the spoils well has reached steady state with consistent seasonal Fluctuations. The seasonal fluctuations result from spring snowmelt causing a mounding of water in the perched aquifer which drains over the summer via discharge from a spring on the lower portion of West Ridge near the elevation of Trout Creek. • GROUND WATER QUALITY Comparisons of water quality data gathered from the alluvial wells at the Edna Mine must be exercised with caution due to the differing stratigraphic units intersected along Trout Creek adjacent to the various wells. The alluvium in the vicinity of Well TR-1.5 intersects stratigraphy above the Wadge coal seam while the alluvium in the vicinity of TR-3 intersects stratigraphy below the Wadge seam. Alluvium in the vicinity of TR- 4 intersects even lower stratigraphic units than those at TR-3. The influence from contact with the differing lithologies is not able to be quantified, therefore, differences between the wells may not be responses to mining related activities. Temperature/pH Temperature (Figure 21) and pH (Figure 22) in 1995 followed the expected trends with temperature exhibiting typical seasonal fluctuations and pH remaining relatively constant over the monitoring period. The amount of C~ 28