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<br />' iV. GROUND WATER <br />GROUND WATER ELEVATIONS <br />Water levels in the alluvial wells at the Edna Mine have remained constant over the period of record with minor <br />Fluctuations occurring seasonally. Elevations of the water in the alluvial wells and the West Ridge spoils well are shown in <br />' Figure 20. in reviewing the data, it is apparent that the spoils well (WR-I) has reached steady state and exhibits consistent <br />seasonal Fluctuations. The seasonal fluctuations result from spring snowmelt causing a mounding of water in the perched <br />' aquifer which drains over the summer via discharge from a spring on the lower portion of West Ridge near the elevation of <br />Trout Creek. <br />GROUND WATER QUALITY <br />' Comparisons of water quality data gathered from the alluvial wells at the Edna Mine must be exercised with caution <br />due to the differing stratigraphic units intersected along Trout Creek adjacent to the various wells. The alluvium in the <br />' vicinity of Well TR-I.5 intersects stratigraphy above the Wadge coal seam while the alluvium in the vicinity of TR-3 <br />intersects stratigraphy below the Wadge seam. Alluvium in the vicinity of TR-4 intersects even lower siratigraphic units than <br />' those at TR-3. The influence from contact with the differing lithologies can not be quantified; therefore, differences between <br />the wells may not be responses to mining related activities. <br />Temperature/pH <br />Temperature (Figure 21) and pH (Figure 22) in 1999 followed the expected trends with temperature exhibiting <br />' typical seasonal Fluctuations and pH remaining relatively constant over the monitoring period. The amount of temperature <br />Fluctuation in Well WR-1 is somewhat greater than expected suggesting the flow to the perched aquifer, although subsurface, <br />' is very shallow. <br /> <br />1 <br />1J <br /> <br />27 <br />