REP01543 - Laserfiche WebLink

Home Browse Search

including the upstream well, are often relatively high. epoils Five wells in the spoils are monitored. They are all located at Mine 1 and were installed in 1985 and 1986. Two of these are only monitored for water level. Water Levels The plots of the historic water levels in the spoil wells are presented on Figures 16 through 19. The water levels normally have a similar pattern to the alluvial wells: they respond rapidly to the spring runoff and then decline rapidly in the summer. Wells 026-SP-1 and 026-SP-3 are sometimes dry by the fall, although this has not happened since 1988. These water levels closely mirror the pattern of the spoil spring discharges discussed later in the report. Wells O1-SP-6 and O1-SP-7 reflect drawdown of the spoil aquifer due to pumping activities associated with the adjacent Foidel Creek Mine. Water Oualit The water quality data area summarized in Tables 24 through 29 for the spoil wells. The historic dissolved solids concentrations for the wells are plotted on Figure 20. The field conductivity ranged • from 1830 to 4140 mg/1 in 1992. The dissolved solids concentrations in all wells show temporal fluctuations that most likely reflect recharge events of low TDS snowmelt. The lowest TDS concentrations in the spoil groundwater typically occur during the Spring snowmelt period. Dissolved solids appear to show an increasing trend over time in well 026-SP-1 and a levelling off of average dissolved solids concentrations in wells 026-SP-2 and 026- SP-3. The spoil groundwater has comparable dissolved solids concentrations to most of the spoil spring discharge, but much higher values than in the background bedrock ground water. The spoil ground water is a calcium-sulfate type with relatively high bicarbonate and low SAR. The data does not indicate any significant changes in the trace metals concentrations. Well 026- SP-2 has relatively high manganese concentrations. •