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I ~ current ground water monitoring program is presented in Table 15-8 of <br />the Yoast Mine PAP. <br />- Alluvium. One well, YAAL14, monitors the Armand Draw alluvium. Two <br />wells, YGAL15 and 16, monitor the Grassy Creek alluvium. Eight wells; <br />YSALl to 6, 8 and 12; monitor the Sage Creek alluvium. Most well water <br />levels exhibit the typical seasonal fluctuation, increasing water levels <br />in the spring followed by decreasing water levels in the summer and <br />fall. Beaver dams may affect water levels in the alluvium. Most wells <br />exhibited water levels this year within their historic ranges. Well <br />YSAL3 had the lowest water level on record in October 2005. <br />- Wadge Overburden. Four wells; YO V9, 28, 29 and 30; monitor the Wadge <br />overburden. Well YOV28 exists in the Armand Draw basin, all others exist <br />in the Sage Creek basin. Most wells exhibit typical seasonal <br />fluctuations, and water levels this year within their historic ranges, <br />although some lag time for the spring recharge is observed. Well YOV28 <br />(downgradient of the 1996/99 mine pit in Armand Draw) has experienced a <br />decrease in water levels since August 1996, with the lowest on record <br />observed in October 2002. Water levels have increased since then. well <br />YOV29 has experienced a decrease in water levels since October 1998 and <br />has been dry since May 2000. Well YOV30 has experienced a general <br />decline in water levels since it was first monitored in 1991. This year, <br />water levels are the lowest on record. Well YOV9 exhibited its lowest <br />water levels ever in October 2003, and has been dry since May 2004. <br />- Wadge Coal. Four wells; YW7, 28, 29, and 30; monitor the Wadge coal <br />seam, Well YW26 exists in the Armand Draw basin, all others exist in the ~~ <br />Sage Creek basin. Due to the low aquifer transmissivities, seasonal <br />water level fluctuations are much less pronounced than the alluvium and <br />overburden, and are often masked by water sampling effects. Well YW28 <br />(downgradient of the 1996/99 mine pit in Armand Draw) had experienced <br />decreasing water levels from October 1996 to August 2003. However, water <br />levels since October 2003 show an increase. In the Sage Creek basin, <br />• water levels at Wells YW29 were decreasing, but have been increasing <br />since May 2003. Water levels at Wells 28 and 29 fall within their <br />3 <br />