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• Groove. In mid 1995-1998 most WQ parameters returned to high concentration similar to <br />late 1993 and early 1994 WQ. No significant trend in WQ was noted in 1998 to indicate <br />continued mining effects or a return to historical WQ, however, chloride resuNs indicated a <br />downward trend. <br />No trend or significant water quality change was noted, for the Perched, A or B-Groove <br />monitoring well aquifers. For example, see Figure 6-5 for conductivity results of B-Groove <br />well (89-1 ). Conductivity results from the B-Groove are consistent, similar to other WQ <br />parameters through this period of record. Late in 1994 (November) WQ effects were noted <br />in the A-Groove water well (90-1 ), which supplies the plant with raw water. Significant <br />• changes in WQ were confirmed for the water well in December 1994. Injection water to <br />cavity #2 was discontinued late in 1994 and studies were initialized (temperature logs of <br />production wells, and outside consultant review). See Figure 6-6 for alkalinity, conductivity, <br />and chloride results (from the water well). Mine water effects on WQ of the water well <br />peaked early in 1995. From 1995-1996 water years, WQ effects noted in the water well <br />decreased significantly. Minor improvement of WQ was noted from 1996 - 1998. <br />Water level (WL) data from baseline condition prior to pumpage or injection, indicated four <br />distinct zones. Figure 6-7 illustrates period of record for down dip wells. Pumping from <br />WRN's water well 90-1, completed in the A-Groove, began in May, 1990 and affected WL <br />of primarily the A-Groove and to a lesser degree the B-Groove aquifer. Heavy pumpage <br />n <br />49 <br />