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RAG, Empire Corporation 1999 AHR <br />water level fluctuations of 20 to 200 feet have been observed at this well but no <br />• '. <br />seasonal pattern is evident. An additional Trout Creek Well, the Okie Plaza well was <br />abandoned in June 1994 as mining advanced through its location. See the 1994 <br />Annual Hydrology Report for data on this well. <br />The water levels in the Middle Sandstone formation as measured in wells TR-4, TR- <br />7a, 81-01, 83-01, 83-02, and 83-03 show fluctuations which are apparently related to <br />dewatering and subsidence associated with Mines 5 and 6. Wells TR-7A, and 81-01 <br />displayed unusually large fluctuations during 1999. The declines in the levels in Wells <br />81-01 (Figure 6) and 83-01 (Figure 7) between 1988 and 1990 appear to have leveled <br />off since the middle of 1990, and have recovered to initially monitored levels. Water <br />• levels in these two wells measured during 1998 are similar to the levels measured in <br />the early eighties, though notable fluctuations have been observed at TR-7A and 81- <br />01. The slight recovery from 1984 through 1988 is apparently the result of a shift in <br />the location of mining to an area further up-dip. Water level fluctuations since 1983 <br />are greater in Well 81-01 as compared to Wells TR-7A and 83-01 as would be <br />expected since this well is closer to the location of mine dewatering. Water levels in <br />well TR-7A (Figure 5) exhibited a decline during 1996, followed by a steady recovery <br />through 1997, and an unusual fluctuation during 1999. RAGEC will continue to <br />monitor this trend. The water levels in Well 83-02 (Figure 8) show a different pattern. <br />The water level decline of about 150 feet from 1987 to mid 1989 in Well 83-02 is <br />• determined to be related to mine dewatering as Mine 5 workings approached the <br />Page 3 <br />