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RAG, Empire Corporation 1999 AHR <br />• location of the well. The more abrupt 200 foot decline in water levels observed near <br />the end of 1989 and beginning of 1990 is thought to be a drawdown response due to <br />subsidence as it is located on only a few hundred feet horizontally from an F seam <br />longwall panel which was mined in a similar time frame. The water level stabilized <br />until 1994 when it recovered to the 1983 levels. Wells TRH and 83-03 are located at <br />greater distance horizontally from the active operations for mines 5 and 6. Water <br />levels in Well TR-4 (Figure 4) historically appear to be related to the fluctuations <br />observed on all three of the down gradient Middle Sandstone Wells: 81-01, 83-01 and <br />83-02. The water level decline in TR-4 prior to 1984 and the subsequent recovery up <br />to 1988 closely parallels the trends observed in Wells 81-01 and 83-01. The decline <br />during the first part of 1991 also parallels the trend in these two wells. However, the <br />•' rapid decline during the last part of 1989 and the first part of 1990 appears to follow <br />the trend observed in Well 83-02 although the magnitude of decline is considerably <br />less. Well 83-03 (Figure 9) is the Middle Sandstone monitoring well located furthest <br />(more than 1.5 miles) from active underground operations for Mines 5 and 6. The <br />overall trend from 1984 through 1999 suggests a similar trend to the other Middle <br />Sandstone wells. The long term decline could be a pressure response due to the <br />overall drop in potentiometric levels in the Middle Sandstone in the vicinity of Mines 5 <br />and 6. Except for Well 83-03, the water levels in the Middle Sandstone wells had <br />either recovered or stabilized in 1995. The water level data collected for the other <br />Middle Sandstone wells continue to display increased stability and a slow recovery. <br />Page 4 <br />