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approximately overlying the gateroads between t}te second and third panels mined in [he EMD. Typical seasonal fluctuations in water levels are depicted at these sites on figures 52 and 54. Field conductivity measurements in general a[ well 001-5-5 (average of 2334 in 2000) were again noted to be higher than the upgradient site 009-S-10 (average of 1291 in 2000). Moving downgradient, field conductivities at wells FO-4 and FO-1 averaged 2430 and 2840 respectively based on the 2000 data. Further downgradient, field conductivities a[ well 008-AV-2 are averaging 1795. Conductivity values a[ well 009-5-10 fluctuated within previously established ranges during 2000. The generally increasing field conductivity Vend noted in previous years for well 001-5-5 appears to be continuing in the 2000 data. Field conductivity measurements at wells 008- AV-] and 008-AV-2 are comparable to measurements at well 001-5-5 and occurred within previously established ranges for these sites. As indicated on Figure 51, TDS concentrations at well 008-AV-2 continued to be stable during 2000. TCC will continue to monitor the direction of [his trend. At well 009-S-10 (Table 24) a new minimum value was recorded for lab pH, and a new maximum value was recorded for nitrite. At well 001-5-5 ('I able 2~) new maximum values were recorded for field conductivity and nitrite. At well 008-AV-2 (Table 26) a new minimum value was recorded for sulfate, and a new maximum value was recorded for nitrite. A[ well FO-I (Table 28) new minimum values were recorded for dissolved calcium, dissolved magnesium, dissolved sodium, dissolved iron, and dissolved manganese. Anew maximum value was recorded for dissolved mercury. At well FO-4 (Table 29) new maximum values were recorded for temperature and dissolved selenium. Wells FO-1 and FO-4 exhibit field conductivities notably higher than alluvial wells upstream and downstream of these sites. Well FO-I is characterized with calcium and sulfate as the dominant cation and anion respectively. Well FO-4 exhibits sodium and sulfate as [he dominant ions. / / Fish Creek A/lluvial Groundw ter: During 2000, five Fish Creek alluvial wells (006-AY-l, 006-AZ-3, 006-AW- 2, 008-AU-3 and 008-AW-3) required monitoring for water lev`e~s and field par meters on a monthly basis, and water quality sampling on a quarterly basis. Tables 30 through 34 provide summaries of the 2000 Water Year data collected at each site. Tables 30a through 34a provide period of record statistical summaries of collected data a[ each site. Figures 56 through 65 provide graphical representations of water levels and selected water quality parameters recorded at each site. Water levels at well 006-AY-I, located on Fish Creek upsVeam of the Southwest Mining District and Mine 2, had exhibited a relatively steady increase from approximately 1990 through 1994 (see Figure 56). From 1994 through 1997, that trend has reversed and has stabilized in 1998 through 2000. The maximum fluctuation in water level at this site over the period of record is 7.5' to date. Well 006-AZ-3 is situated downstream of 006- AY-1 and below [he Fish Creek Borehole. Well 006-AZ-3 is monitored in conjunction with surface water site 307 and the water level relationship is presented as Figure 58. Further downstream, well 006-A W-2 and surface water site 1002 are monitored and water levels are plotted as Figure 60. Again in 2000, the interrelationship between alluvial groundwater and surface water is evident on these two plots. Well 008-AU-3 and surface water site 305 monitor water levels upstream from the Fish Creek Tipple area with data presented on Figure 62. The • furthest downgradient Fish Creek alluvial monitoring well is 008-AW-3 (Figure 64) located near the Fish Creek Tipple. No unusual water level fluctuations were noted at any of these sites during 2000. 6