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• Foidel Creek Alluvial Groundwater; During 1997, five Foidel Creek alluvial wells (009-S-1Q, 001-S-S, 008- <br />AV-2, FO-1, and FO-4) required monitoring for water levels and field parameters on a monthly basis, and water <br />quality sampling on a quarterly basis. An additional well (008-AV-1) required only montlily monitoring for <br />water levels and field parameters. All monitoring requirements were met at these sites, Tables 20 through 25 <br />provide summaries of the 1997 Water Yeaz data collected at each site. Tables 20a through 25a provide period <br />of record statistical summaries of collected data at each site. Figwes 35 through 47 provide graphical <br />representations of water levels and selected water quality parameters recorded at each site. <br />Water levels during 1997 remained generally consistent with established ranges and patterns and showed the <br />typical seasonal variability of elevated water levels in the spring. Well 009-5-10 provides data for the alluvial <br />aquifer upgradient from the mine portals. Well 001-S-5 is located just downgradient form the mine portals and <br />surface facilities location and is monitored in conjunction with surface water monitoring site 8. Figure 39 is <br />indicative of the general relationship between the alluvial groundwater elevations and surface water elevations at <br />these two sites. Wells 008-AV-1 and 008-AV-2 are monitored in conjunction with surface water site 304 at a <br />point on Foidel Creek approximately 1000 feet upstream of the confluence of Foidel and Middle Creeks. Water <br />levels in these wells and the stream show the typical seasonal interrelationship of relatively rapid increases and <br />declines associated with spring runoff (Figwe 40). The longer-term trends in water levels at these sites <br />generally parallel the fluctuations observed in annual stream flows. Wells FO-1 and FO-4 are situated on Foidel <br />Creek approximately overlying the gateroads between the second and third panels to be mined in the EMD. <br />• Typical seasonal fluctuations in water levels are depicted at these sites on Figwes 44 and 46. <br />Field conductivity measwements in general at well 001-S-S (1997 average approximately 2100) were again <br />noted to be higher than the upgradient site 009-5-10 {1997 average approximately 1300). Moving <br />downgradient, field conductivities at wells FO-4 and FO-1 averaged 2800 and 3250 respectively based on the <br />1997 data. Further downgradient, field conductivities at well 008-AV-2 are averaging approximately 1760. <br />Conductivity values at we11009-5-10 fluctuated within previously established ranges during 1997, The generally <br />increasing field conductivity trend noted in previous years for well 001-5-5 is slightly evident again in the 1997 <br />data. Field conductivity measwements at wells 008-AV-1 and 008-AV-2 are comparable to measwements at <br />well 001-S-5 and occwred within previously established ranges for these sites. As indicated on Figwe 43, TDS <br />concentrations at we11008-AV-2 continued to be stable during 1997. TCC will continue to monitor the direction <br />of this trend. <br />Atwell 009-5-10 (Table 20), new maximum value was documented in November 1996 for nitrate. At well 008- <br />AV-1 (Table 23), a detectable concentration of cadmium was noted in November, 1996 to establish a new <br />maximum value for that parameter and a new maximum value was recorded for ammonia-free in August. Wells <br />FO-I (Table 24) and FO-4 (Table 25) established many new maximum and minimum values for tested <br />parameters due to the limited period for which values have been collected at those sites. FO-1 and FO-4 exhibit <br />. field wnductivities notably higher than alluvial wells upstream and downstream of these sites. Well FO-1 is <br />-6- <br />