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<br />In summary, no significant change in level of the Perched aquifer was noted from pumpage <br />or mining activity, however a decrease in the level in 1994 was probably a result of <br />extremely low precipitation. In recent wet years 1996-98, WL has recovered. 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 effects from mining, <br />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 mining was performed and a WL decrease was noted <br />during operational shut downs. A project effect on the Dissolution Surface aquifer was <br />predicted in the EIS. The EPA has determined the Dissolution Surface aquifer is not a <br />protected aquifer due to high TDS. The project is closely monitoring this aquifer. Use of <br />submersible pumps from 1995 - 1998 resulted in continued WL decline in the Dissolution <br />Surface aquifer at the down-dip site (EX-2). <br />i <br />54 <br />