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submersible pumps from 1995 - 2003 resulted in continued WL decline in the Dissolution <br />Surtace aquifer at the down-dip site (EX-2). The water level of EX-2 is lower than pre-mining or <br />baseline WL for the fourth year in a row, which is NSI's goal. <br />Dedicated Monitoring Wells Up-Gradient <br />Wells established to monitor up-gradient conditions are: <br />Wells A uifer <br />IRI-1 Perched <br />90-2 Dissolution Surface <br />90-3 &Groove <br />90-4 A-Groove <br />The up~radient wells were completed with water quality samplers in July 1990 and may show <br />residual effects of prior completion problems from 1980-1990. Water quality results indicate <br />Dissolution Surface (90 2) and B-Groove (90-3) data similar to historical data for NSI. Well 90- <br />2 indicated an upward trend for conductivity and alkalinity (see Figure 6~) from 1999 - 2000, <br />however in 2001 conductivity and alkalinity decreased significantly back to the baseline <br />concentrations. In 2003 conductivity and alkalinity increased similar to years 1999- 2000. The <br />WQ for the A-Groove (90-4) well has historically reflected a mixture of water from deeper <br />aquifers. The initial WQ of the Perched well IRI-1 was effected by completion activity, since <br />1993 concentrations are typical (see Figure 6-9) and similar to the down-dip well 89-3. <br />Tables, 6-7, 6-8, 6-9, and 6-10, present historical summary of water quality data through <br />2003. No significant water quality changes were noted during 2003 to indicate mining <br />effects. <br />r <br />50 <br />