Laserfiche WebLink
• TV. GROUND WATER <br />GROUND WATER ELEVATIONS <br />Water levels in the alluvial wells at the Edna Mine have remained constant <br />over the previous years with minor fluctuations occurring seasonally. Elevations of <br />the water in the alluvial wells and the West Ridge spoils well are shown in Figure <br />20. As suggested in the baseline studies, the occurrence of a drawdown in any of <br />the wells is anticipated only during mining at the base of the slope near Trout <br />Creek. However, no drawdown was noticed at TR-1.5 during the early 1980's when <br />mining took place on the lower slope of West Ridge. <br />In reviewing the data, it is interesting to note that the spoils well (WR-1) <br />has reached steady state and exhibits consistent seasonal fluctuations. The <br />seasonal fluctuations result from spring snowmelt causing a mounding of water in the <br />perched aquifer which drains over the summer via discharge from a spring on the <br />lower portion of West Ridge near the elevation of Trout Creek. <br />• GROUND WATER QUALITY <br />Comparisons of water quality data gathered from the alluvial wells at the Edna <br />Mine must be exercised with caution due to the differing stratigraphic units <br />intersected along Trout Creek adjacent to the various wells. The alluvium in the <br />vicinity of Well TR-1.5 intersects stratigraphy above the Wadge coal seam while the <br />alluvium in the vicinity of TR-3 intersects stratigraphy below the Wadge seam. <br />Alluvium in the vicinity of TR-9 intersects even lower stratigraphic units than <br />those at TR-3. The influence from contact with the differing lithologies is not <br />able to be quantified, therefore, differences between the wells may not be responses <br />to mining related activities. <br />Temperature/pH <br />Temperature (Figure 21) and pH (Figure 22) in 1995 followed the expected <br />trends with temperature exhibiting typical seasonal fluctuations and pH remaining <br />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 <br />• the perched aquifer, although subsurface, is very shallow. <br />27 <br />