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in the potentiometric surface at this location. CEC will continue to monitor this location <br />and is in the process of determining whether or not an equipment malfunction resulted <br />in these anomolously high readings. The water level decline in TRH prior to 1984 and <br />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 1996 suggests a similar trend to <br />the other Middle Sandstone wells. The long term decline could be a pressure <br />• response due to the overall drop in potentiometric levels in the Middle Sandstone in <br />the vicinity of Mines 5 and 6. Except for Well 83-03, the water levels in the Middle <br />Sandstone wells had either recovered or stabilized in 1995. During 1996, water level <br />data collected indicates a marked increase in water level in well TR-4, a notable <br />decline at well TR-7a, the continuation of an increasing trend at well 81-01, stable <br />levels at wells 83-01 and 83-02, and a continuing declining trend at well 83-03. <br />Monitoring results through year 1995 (Fig. 10) showed no apparent change in the <br />water levels in the Twentymile Sandstone that could be attributable to mining <br />activities. During 1996, all three wells showed decreases in water levels to varying <br />• degrees. Well 259 was converted late in the year from a pressurized well set-up to a <br />C-61-044 t996 AHR. I.\EMPIREWHR196AHR\EMPAHR96.DOC Page 4 <br />