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that occumng over the EMD. This well appeazed unaffected during 1997 with the previously established <br />recovering water level trend continuing. Seasonal fluctuations in water levels are pronounced at this site. <br />No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overbwden wells during 1997. A New maximum value for lead was established in May at well FBR-11-A <br />(Table 2). At well 91M006 (Table 4), several new maximum and minimum values were recorded. Elevated pH <br />values continued to remain evident at this site during 1997. New minimum values were recorded during the year <br />for hardness and carbonate. A new maximum was noted for solids. At well 008-77-58 (Table 5), a new <br />maximum was recorded for dissolved calcium. At well 93M001 (Table 6), new minimum values were recorded <br />for hardness and dissolved calcium; new maximum values were recorded for lab conductivity, total alkalinity, <br />and SAR. At well 93M003 (Table 7), new minimum values were recorded for hardness, dissolved calcium, <br />dissolved magnesium, sulfate, and bicarbonate; new maximwn values were recorded for conductivity, pH, <br />alkalinity, dissolved sodium, SAR, and carbonate. The data is not indicative of significant changes in trace <br />metals concentrations. <br />Twentvmile Sandstone: During 1997, 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-11-B, and FBR-2) required monitoring for water levels, field parameters, and water quality <br />parameters on asemi-annual basis. All monitoring requirements were completed at these sites during 1997 with <br />• field measwements obtained and water quality samples collected during May and September. Tables 8, 9, 1Q, <br />and 11 provide summaries of the 1997 Water Year data collected at each site. Figwes 17 through 24 provide <br />graphical representations of water levels and selected water quality parameters rewrded at each site. <br />The potentiometric surface in the Twentymile Sandstone as reflected by these fow wells is generally observed to <br />slope from south to north. Water levels during 1997 were observed as follows. Wells 006-BRDH-7 (Figwe <br />17), 91M005 (Figwe 19), FBR-11-B (Figwe 21), and FBR-2 (Figwe 23) remained steady throughout the year <br />with no mine impacts apparent. The lower water levels typical in well 91M005 relative to well 006-82-48A <br />continued to remain apparent. Well 91M005 was established in 1993 to replace well 006-82-48A which was <br />mined through during 1993. <br />Field measwements are presented in Tables 8 and 9 for wells 006-BRDH-7 and 91M005. Field parameter <br />measwements on these Twentymile Sandstone wells monitored during 1997 retwned values within anticipated <br />ranges with no mine related impacts evident. Field measwements and water quality parameters for wells FBR- <br />11-B and FBR-2 are provided on Tables 10 and ll respectively. These wells show slightly different water <br />quality characteristics with higher calcium, magnesium, and sodium concentrations noted in well FBR-2 along <br />with higher bicarbonate, carbonate, and total alkalinity wncentrations. TDS concentrations recorded for wells <br />FBR-2 and FBR-11-B were more similaz than in past years. At well FBR-11-B (Table 10), new minimum <br />• values were recorded for conductivity and dissolved sodium; new maximum values were recorded for pH, <br />-3- <br />