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• conductivity, lab pH, and dissolved manganese. At well FBR-11-A (Table 2), a new minimum value for lab pH was recorded. New maximum values were recorded for dissolved selenium, nitrite, and ortho-diss phosphate. At well 006-82-74C (Table 3), new maximum values were recorded for field conductivity, total dissolved solids. dissolved sodium, and nitrite. At well 91 M006 (Table 4) elevated pH values continued to remain evident during 2000. New minimum values were recorded during the year for total dissolved solids, dissolved calcium, dissolved magnesium, dissolved sodium, and bicarbonate. New maximum values were recorded for field pH, lab pH, and dissolved selenium. At well 008-77-58 (Table 5), a new maximum value was recorded for dissolved selenium. At well 93M001 (Table 6), new minimum values were recorded for field conductivity, lab conductivity, lab pH, and dissolved sodium. At well 93M003 (Table 7), new minimum values were recorded for temperature, TDS, and dissolved sodium. New maximum values were recorded for field pH, nitrate, and nitrite. The data is not indicative of significant changes in trace metals concentrations. / ~ '~ Twentvmile Sandstone: During 2000, two wells, 006-BRDH-7 and 91M005, required monitoring for water ,~ / levels and field parameters on asemi-annual basis, and four wells, FBR-11-B, FBR-2, 97012TM and 97013"I'M, required monitoring for water levels, field parazneters, and water qu`aliry parameters on asemi-annual basis. All monitoring requirements were completed at these sites during 2000. Tables 8 through 13 provide summaries of the 2000 Water Year data collected at each site. Figures 17 through 28 provide graphical representations of water levels and selected water quality parameters recorded at each site. The po[en[iome[ric surface in the Twentymile Sandstone as reflected by these six wells is generally observed to • slope from southwest to northeast. Water levels at wells 006-BRDH-7 (Figure 17), 91 M005 (Figure 19), FBR- 11-B (Figure 21), FBR-2 (Figure 23), and 97013TM (Figure 27), remained steady throughout 2000 with no mine impacts apparent. A damaged hydrant at well 97012TM (Figure 25) prevented water level measurements in 2000. The lower water levels typical in well 91M005 relative to well 006-82-48A continued to remain apparent. Well 91 M005 was established in 1993 to replace well 006-82-48A which was mined through during 1993. Field measurements are presented in Tables 8 and 9 for wells 006-BRDH-7 and 91M005. Field parameter measurements on these Twentymile Sandstone wells monitored during 2000 returned values within anticipated ranges with no mine related impacts evident. Field measurements and water quality parameters for wells FBR- 11-B, FBR-2, 97012TM, and 97013TM are provided on Tables 10 through 13. At well FBR-I I-B (Table 10), new minimum values were recorded for lab pH, dissolved calcium, and carbonate. New maximum values were recorded for temperature, field conductivity, lab conductivity, TDS, dissolved sodium, sulfate, and nitrite. A[ well FBR-2 (Table 11), new minimum values were recorded for lab conductivity, pH, TDS, dissolved magnesium, dissolved sodium, bicazbonate, and dissolved iron. New maximum values were recorded for dissolved selenium and nitrate. Well 97012TM (Table 12) and 97013TM (Table ]3) established many new maximum and minimum values for tested parameters in 2000, due to the limited period for which values have been collected at these sites. However, none of these values fell outside fire typical historical range of other wells in this aquifer. , ~~ y,N- ~ c- ~~9 ~.., Trout Creek Sandstone: During 2000, six Trout Creek Sandstone wells, 001-83-106, 001-83-107, FCM #2 FBR- i 2-E, 97012TC and 97013TC required monitoring for water levels and field parameters on asemi-annual basis, and one well, 008-75-EFC, required an annual water level measurement. Wells 001-83-1Ofi, FCM #2, FBR-2-E,, 3