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• In summary, no significant change in the WL of the Perched aquifer was noted from <br />pumpage or mining activity, however a decrease in the WL in 1994 and 1999-2000 was <br />probably a result of extremely low precipitation, with WL increase in wet years. A direct <br />correlation is noted between pumpage and levels reported for the A-Groove. The pumpage <br />effect on the B-Groove is less than the A-Groove, but corresponds with the A-Groove. After <br />decreased pumpage following temporary suspension of activities (1991), the A-Groove <br />recovered significantly and the B-Groove recovered more slowly. No WL effects from <br />mining, other than water well pumpage, were detected in the A or B-Groove wells. <br />The WL of the Dissolution Surface well EX-2, changed significantly from 1993-1994. The <br />• WL increase corresponds to when pressurized mining was performed, and a WL decrease <br />was noted during operational shutdowns. A project effect on the Dissolution Surface <br />aquifer was predicted in the EIS. The EPA has determined the Dissolution Surface aquifer <br />is not a protected aquifer due to high TDS. The project is closely monitoring this aquifer. <br />Use of submersible pumps from 1995 - 2000 resulted in continued WL decline in the <br />Dissolution Surface aquifer at the down-dip site (EX-2). During the year 2000, the WL of <br />EX-2 was similar to premining or baseline WL for the first time in six years. <br />49 <br />• <br />