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• and the subsequent recovery up to 1988 closely parallels the trends observed in Wells <br />81-01 and 83-01. The decline during the first part of 1991 also parallels the trend in <br />these two wells. However, the rapid decline during the last part of 1989 and the first <br />part of 1990 appears to follow the trend observed in Well 83-02 although the magnitude <br />of decline is considerably less. Well 83-03 (Figure 9) is the Middle Sandstone <br />monitoring well located furthest (more than 1.5 miles) from active underground <br />operations for Mines 5 and 6. The overall trend from 1984 through 1997 suggests a <br />similar trend to the other Middle Sandstone wells. The long term decline could be a <br />pressure response due to the overall drop in potentiometric levels in the Middle <br />Sandstone in the vicinity of Mines 5 and 6. Except for Well 83-03, the water levels in <br />the Middle Sandstone wells had either recovered or stabilized in 1995. During 1997, <br />• the water level in Well 83-03 increased significantly, possibly beginning a similar <br />recovery. The water level data collected for the other Middle Sandstone wells <br />continue to display increased stability and a slow recovery. <br />Monitoring results through year 1995 (Fig. 10) showed no apparent change in the water <br />levels in the Twentymile Sandstone that could be attributable to mining activities. <br />During 1997, all three wells continued to show decreases in water levels to varying <br />degrees. These responses are not believed to be mine-related as no unusual activities <br />or additional mining occurred in the vicinity of these wells during 1997. CEC will <br />continue to monitor these sites. <br />• C-81-044 1997AFIR Page 4 <br />