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• water level sumtaries for each site. Figures 12 through 17 provide graphical representations of water levels and <br />selected water quality parameters recorded at each site. <br />The potentiometric surface in [he Twentymile Sandstone generally slopes from southwest to northeast. The <br />Water levels and conductivity a[ well 006-BRDH-7 (Figures 12 and 13, respectively), remained consistent with <br />that of previous years, with no mine impacts apparent. Water levels in well FBR-2 (Figure 14) were consistent <br />through [he late 1990s, however, in 2003 water levels dropped by approximately 56 feet, based upon a <br />measurement in April of 2003. In 2004, the water level dropped an additional 84 feet. In 2005 the decline <br />continued. In May and June of 2003, work on the eastern end of the 16 Right panel was approaching the genera] <br />vicinity of FBR-2. This anomaly may be related to work on the 16 right panel and the well's close proximity to <br />an adjacent fault zone. TCC will continue to monitor and report on this anomaly. TDS values for FBR-2 (Figure <br />15) also dropped in 2003. Well 97013TM (Figure 16) water level dropped about 55 feet in 2005 as compared to <br />previous years. TCC currently has no explanation for this decrease. This anomaly will be monitored in 2006. <br />__ TDS values have remained consistent as compared to previous years. <br />Trout Creek Sandstone: During 2005, five Trout Creek Sandstone wells, 001-83-106, 001-83-107, 95M001, <br />FBR-2-E, 97012TC and 97013TC. Note that per TR03-42, monitoring frequency for water levels and field <br />parameters were reduced to an annual basis, and water quality sampling to a bi-annual (every other year) basis. <br />Also per TR03-42, wells 008-75-EFC and 97012TC were deactivated. All monitoring requirements were <br />completed at these sites. 2004 data is presented in Tables 10 through 14. <br />• Well FCM#2 was replaced in the fall of 1995 by monitoring we1195M001, with semi-annual monitoring during <br />2004 occurring at well 95M001 in lieu of FCM #2. Summaries of the Water Year data collected at each site can <br />be found in previous AHRs. Tables l0a through 14a provide [he historical statistical summaries of collected data <br />at wells 001-83-106, 001-83-107, 95M001, FBR-2-E, and 97013TC, respectively. Figures 18 through 25 provide <br />graphical representations of water levels and selected water quality parameters recorded at active sites. <br />The pumping of well 001-83-106 (Figure 18) complicates the potentiometric surface in [he Trout Creek <br />Sandstone. Water levels in well 001-83-106 continue a slight increase, as seen during the previous five water <br />years. The potentiomeiric surface trends prevalent in the Twentymile Sandstone and Wadge Overburden aquifers <br />are not evident in the monitored Trout Creek wells. The previously monitored well 006-83-48C routinely <br />exhibited water levels in the 7100 ft elevation range while replacement well FCM#2 exhibited levels around [he <br />6520 ft elevation during 1995. In the fall of 1995, well 95M001 was established in part to address [he apparent <br />discrepancy in water levels between wells 006-83-48C and FCM#2. Water levels from well 95M001 confirm <br />[hat levels recorded from well FCM #2 were accurate (Figure 20). Mining in the northern mining district began in <br />1995, which is down dip of this well. Water levels in well 95M001 declined since 1994, but appear to have <br />stabilized since 2002 (Figure 20). The original decline may have been influenced by the mining operation. At <br />Well 95M001 (Table 12), conductivity values continue to be high. . <br />. Significant inflows from the Trout Creek Sandstone into the mine workings have not been encountered to date to <br />account for the apparent Ioweting of the potentiometric surface in the Trout Creek formation, as indicated by the <br />5 <br />