Laserfiche WebLink
the subsequent recovery up to 1988 closely parallels the trends observed in Wells 81- <br />01 and 83-01. The decline during the first part of 1991 also parallels the trend in these <br />two wells. However, the rapid decline during the last part of 1989 and the first part of <br />1990 appears to follow the trend observed in Well 83-02 although the magnitude of <br />decline is considerably less. Well 83-03 (Figure 9) is the Middle Sandstone monitoring <br />well located furthest (more than 1.5 miles) from active underground operations for <br />Mines 5 and 6. The overall trend from 1984 through 1998 suggests a similar trend to the <br />other Middle Sandstone wells. The long term decline could be a pressure response due <br />to the overall drop in potentiometric levels in the Middle Sandstone in the vicinity of <br />Mines 5 and 6. Except for Well 83-03, the water levels in the Middle Sandstone wells <br />had either recovered or stabilized in 1995. During 1998, the water level in Well 83-03 <br />• also displayed unusually large fluctuations. The water level data collected for the other <br />Middle Sandstone wells 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 1998, 9 Mine well and well 84-01 displayed unusually large fluctuation, while <br />well 259 remained stable. These responses are not believed to be mine-related as no <br />unusual activities or additional mining occurred in the vicinity of these wells during <br />1998. CEC will continue to monitor these sites. <br />The suspect data for well TRH, noted in the 1996 AHR, has been rectified. The <br />• C-81-041 1998 AHR Page 4 <br />