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Also: about 130 feet below the Wadge seam is the Wolf Creek Coal Seam. TC began rampling down from the <br />Wadge to the Wolf Creek seam in October 2014. Following development of the ramp and an initial gate road, <br />mining of the Wolf Creek Coal Seam began in March 2015. <br />Wadge Overburden: Five Wadge Overburden wells (009-79-4, 006-82-74C, 91M006, 008-77-58, and <br />93M001) are currently monitored. Water quality sampling is required annually. All monitoring requirements <br />were completed at these sites. Tables 2 through 6 provide summaries of the 2018 Water Year data. Tables 2a <br />through 6a provide some historical statistical summaries of collected data at each site through 2018. Figures 3 <br />through 1 I provide graphical representations of water levels and selected water quality parameters recorded at <br />each site. <br />The potentiometric surface in the Wadge Overburden generally slopes from south to north in monitored wells in <br />the vicinity of the TC facilities, as shown by water levels in wells 009-79-4, 006-82-74C, and 91 M006. During <br />2018, the water levels in well 009-79-4 (Figure 3) continue to be comparable to previous years going back to <br />1984. Well 009-79-4 (Figure 4) had exhibited a general decline in total dissolved solids since 1995, which has <br />stabilized since about 2000. Well 006-82-74C (Figures 5 and 6) water levels have been relatively stable since <br />1999, although 2008 did exhibit a slight drop, and has subsequently stabilized through 2018. TDS measurement <br />for 2005 indicated a new high and has dropped off to date, with 2016 indicating an historic low. Well 91 M006 <br />(Figure 7) has exhibited a steady decline in water level beginning in 1992, which relates to dewatering impacts <br />from the underground mining operation. These levels have appeared relatively stable over the last years. TC was <br />informed by Miller Water Monitoring Services that they could not get a probe down this well, suggesting the <br />well, which is a 2 -inch steel pipe may have sheared somewhere below ground surface. TC will discuss this <br />situation with CDRMS. <br />Well 008-77-58 (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 2018 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. Well 93M001 (Figure 10) has exhibited a steep decline in water level from 1994 through 2002. From <br />2002 TDS appears to be relatively stable, with a drop of 50 feet occurring in 2016 but has increased back to the <br />decreasing trend line in 2018. The earlier declines were associated with underground mining of the Eastern <br />Mining District (EMD). The latest drop may be related to mining of the Wolf creek seam. TDS concentrations <br />(Figure 11) in this well remains very stable. <br />No anomalous water quality impacts attributable to mining were evident in data collected from Wadge <br />Overburden wells during 2018, as compared to historical results. <br />Twentvmile Sandstone: One well, 006-BRDH-7, requires monitoring for water levels and field parameters on a <br />semi-annual basis, and two wells, FBR-2, and 97013TM, required monitoring for water levels, field parameters, <br />on a semi-annual basis, and water quality parameters on an annual basis. Water quality frequency is annual. All <br />monitoring requirements were completed at these sites during 2018. Tables 7 through 9 provide summaries of <br />5 <br />