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No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overburden wells during 1996. Two monitored parameters at well 009-79-4 (Table 1) were observed to return <br />values beyond the previously established ranges. Anew minimum SAR value was established in April of 1996, <br />and a new maximum pH was recorded in September. The previously recorded maximum pH was 8.8 for this <br />well. TCC will continue to monitor this situation as increased pH values have also recently been recorded at other <br />bedrolls. New maximum values for bicazbonate, total alkalinity, and ortho-dissolved phosphorus were <br />established in April at well FBR-11-A (Table 2). A slightly elevated new maximum SAR value was recorded at <br />this well in September. New maximum values for well 006-82-74C (Table 3) include total dissolved solids, <br />recorded in April, and dissolved lead and ortho-dissolved phosphorus values recorded in September. At well <br />91 M006 (Table 4), several new maximum and minimum values were recorded. Elevated pH values continued to <br />remain evident at this site during 1996. New min~im_.uin~alues were recorded during the year for dissolved <br />calcium, dissolved magnesium, bicarbonate, hardness, and total dissolved solids. New maximums were noted for <br />dissolved iron, dissolved lead, and dissolved molybdenum. The data is not indicative of significant changes in <br />trace metals concentrations. Monitored parameters at wells 008-77-58 (Table 5), 93M001 (Table 6), and 93M003 <br />(Table 7) were all noted to occur within previously established ranges. <br />CTwentymile Sandstone! During 1996, two Twentymile Sandstone wells (006-BRDH-7 and 91M005) required <br />monitoring for water levels and field parameters on asemi-annual basis. Two additional Twentymile Sandstone <br />wells, FBR-II-B, and FBR-2) required monitoring for water field parameters, and water quality <br />parameters on- semi-annual basis. Il monitoring requirements were completed at these sites during 1996 with <br />field measurements obtained and water quality samples collected during April, May, and September. Tables 8, 9, <br />10, and I I provide summaries of the 1996 Water Year data collected at each site. Figures 17 through 24 provide <br />graphical representations of water levels and selected water quality parameters recorded at each site. <br />The potentiometric surface in the Twentymile Sandstone as reflected by these four wells is generally observed to <br />slope from south to north. Water levels during 1996 were observed as follows. A slight decline was noted in well <br />006-BRDH-7 (Figure 17), wells 91M005 (Figure l9), FBR-11-B (Figure 21), and FBR-2 (Figure 23) remained <br />steady throughout the year with no mine impacts apparent. The lower water levels typical in well 91M005 <br />relative to well 006-82-48A continued to remain apparent. Well 91M005 was established in 1993 to replace well <br />006-82-48A which was mined through during 1993. <br />Field measurements are presented in Tables 8 and 9 for wells 006-BRDH-7 and 91M005. Field parameter <br />measurements on these Twentymile Sandstone wells monitored during 1996 returned values within anticipated <br />ranges with no mine related impacts evident. Field measurements and water quality parameters for wells FBR- <br />11-B and FBR-2 are provided on Tables 10 and 1 l respectively. These wells show slightly different water quality <br />characteristics with higher calcium, magnesium, and sodium concentrations noted in well FBR-2 along with <br />higher bicarbonate, carbonate, and total alkalinity concentrations. TDS concentrations recorded for well FBR-2 <br />-3- <br />