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Significant changes in WQ were confirmed for the water well in December 1994, see Figure <br />6-6 for alkalinity, conductivity, and chloride results. Mine water effects on WQ of the water <br />well peaked early in 1995 when submersible pumps were utilized in mining. From 1995- <br />1997 water years, WQ effects noted in the water well decreased significantly. Minor but <br />continual improvement of WQ was noted from 1997 - 2003. WQ concentrations have <br />returned to regional WQ levels for the A-Groove. <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 />NSI's water well 90-1, completed in the A-Groove, began in May 1990 and affected WL of <br />primarily the A-Groove and to a lesser degree the B-Groove aquifer. Significant changes in <br />WQ were confirmed for the water well in December 1994. Raw water pumpage effects, i.e. A- <br />Groove dewatering and an example of potentiometric WL recovery following reduced pumpage <br />can be noted on Figure 6-7. <br />The Dissolution Surface WL changes have been correlated with mining activity. Following <br />use of submersible pumps in cavities #1A, 3A, 4A, and 5H in 1995 - 2003, the WL in EX-2 <br />and other Dissolution Surface wells has significantly declined. <br />Submersible pumps provide the ability to control recovery, and therefore balance net flow in <br />and out of cavities. <br /> <br />46 <br />