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• No anomalous water quality impacts attributable to mining were evident in data collected from Wadge Overburden wells during 2004. Twentvmile Sandstone: During 2004, 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, 97012TH and 47013TH, required monitoring for water levels, field parameters, and water quality parameters on asemi-annual basis. Water quality frequency is annual. Al] monitoring requirements were completed at these sites during 2004. Note that wells 91M005 and 97012TH were deactivated in April 2003 per TR03-42. Well FBR-11-B was damaged in 2002 as a result of subsidence from the 13 RT panel. Under TR03-42, DMG approved the elimination of this well. This well was abandoned in August 2003 (refer to previous AHRs for FBR-11-B data). Tables 6 through 11 provide summaries of the 2003 Water Yeaz data collected at each site. Tables 6a through lla provide historical statistical summaries of collected data at each site through 2003. Tables 6b through l lb provide period of record water level summaries for each site. Figures 12 through 17 provide graphical representations of water levels and selected water quality parameters recorded at each site. The potentiometric surface in the Twentymile Sandstone generally slopes from southwest [o northeast. The Water levels and conductivity at well 006-BRDH-7 (Figures 12 and 13, respectively), remained consistent with that of previous years, with no mine impacts apparent. Well FBR-2 (Figure 14) has exhibited a slight general decline in water level since the late 1990s, however, in 2003 water levels dropped by approximately 56 feet, • based upon a measurement in April of 2003. In 2004, the water level dropped an additional 84 feet. In May and June of 2003, work on the eastern end of the 16 Right panel was approaching the general vicinity of FBR-2. This anomaly may be related to work on the 16 right panel and the well's close proximity to an adjacent fault zone. TCC will continue to monitor and report on this anomaly. TDS values for FBR-2 (Figure 15) have continued a general increase since 2000, but are still within historical ranges. We1197013TM (Figure 16) water ]eve] dropped about 55 feet in 2004 as compared to previous years. TCC currently has no explanation for [his decrease. This anomaly will be monitored in 2005. TDS values have remained consistent as compared to previous years. Field measurements are presented in Tables 6 and 7 for wells 006-BRDH-7 and 91H005. Field parameter measurements on these Twentymile Sandstone wells monitored during 2004 exhibited values within anticipated ranges, with no mine related impacts evident. Field measurements and water quality parameters for wells FBR- I I-B, FBR-2, 97012TH, and 97013TH are provided on Tables 8 through 11. None of these values fell outside the typical historical range of other wells in this aquifer. Trout Creek Sandstone: During 2004, six Trout Creek Sandstone wells, 001-83-106, 001-83-107, 95H001, FBR-2-E, 97012TC and 97013TC. Note that per TR03-42, monitoring frequency for water levels and field parameters were reduced to an annual basis, and water quality sampling to a bi-annual (every other year) basis. Also per TR03-42, wells 008-75-EFC and 97012TC were deactivated. Al] monitoring requirements were completed at these sites. 2004 data is presented in Tables 12 through 17. • Wel] FCM#2 was replaced in the fall of 1995 by monitoring well 95H001, with semi-annual monitoring during 2004 occurring at well 95M001 in lieu of FCM #2. Summaries of the Water Year data collected at each site can 5