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• We11008-77-58 (Figure 8) has been unaffected by mining and exhibits seasonal water level fluctuations. During <br />1998, this well experienced an unusually long seasonal decline, and subsequently an established recovering water <br />level trend resumed. In 2007 TDS concentrations (Figure 9) remain at consistent levels seen since the mid 1990s. <br />The potentiometric surface reflected by well 93M001, has generally been observed to slope from southwest to <br />northeast. We1193M001 (Figure 10) has exhibited a steep decline in water level from 1994 through 2002. From <br />2002 to date there has been a more gentle decline. These earlier declines were associated with underground <br />mining of the Eastern Mining District (EMD). TDS concentrations (Figure 11) in this well remain very stable. <br />No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overburden wells during 2007. <br />Twentymile Sandstone: During 2007, one well, 006-BRDH-7, required monitoring for water levels and field <br />parameters on asemi-annual basis, and two wells, FBR-2, and 97013TM, required monitoring for water levels, <br />field parameters, on asemi-annual basis, and water quality parameters on an annual basis. Water quality <br />frequency is annual. All monitoring requirements were completed at these sites during 2007. Tables 7 through 9 <br />provide summaries of the 2007 Water Year data collected at each site. Tables 7a through 9a provide historical <br />statistical summaries of collected data. Figures 12 through 17 provide graphical representations of water levels <br />and selected water quality parameters recorded at each site. <br />• The potentiometric surface in the Twentymile Sandstone generally slopes from southwest to northeast. The <br />Water levels and conductivity at 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 the late 1990s, however, in 2003 water levels dropped by approximately 56 feet, based upon a <br />measurement in April of 2003. Through 2005, the water level dropped an additional 84 feet. In 2006 water <br />levels appear to have recovered slightly, continuing in 2007. In May and June of 2003, work on the eastern end <br />of the 16 Right panel was approaching the general vicinity of FBR-2. This anomaly may be related to work on <br />the 16 right panel and the well's close proximity to an adjacent fault zone. TCC will continue to monitor and <br />report on this anomaly. TDS values for FBR-2 (Figure 15) went up from typical values in the upper 900's to <br />1170 in 2006 and 1140 in 2007. This may be related to the drop in water levels. Well 97013TM (Figure 16) <br />water level continue to drop in 2007. TCC currently has no explanation for this decrease, other than to speculate <br />that it may be related to dewatering from nearby faulting. TDS values in 2007 indicated 650 mg/1 (Figure 15), <br />which is consistent with recent historical values. <br />Trout Creek Sandstone: During 2007, five Trout Creek Sandstone wells, 001-83-106, 001-83-107, 95M001, <br />FBR-2-E, and 97013TC. Note that per TR03-42, monitoring frequency for water levels and field parameters <br />were reduced to an annual basis, and water quality sampling to a bi-annual (every other year) basis. Also per <br />TR03-42, Trout Creek Sandstone wells 008-75-EFC and 97012TC were deactivated. All monitoring <br />requirements were completed at these sites. 2007 data is presented in Tables 10 through 14. <br />Well FCM#2 was replaced in the fall of 1995 by monitoring well 95M001, with semi-annual monitoring during <br />2007 occurring at we1195M001 in lieu of FCM #2. Summaries of the Water Year data collected at each site can <br />5 <br />