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increases in WL were noted. In 2003 the Dissolution Surface was close to baseline level of <br /> <br />• <br /> <br />534'. NSI's drilling and mining activities in 1995-2003 were concentrated near the up-dip <br />site and resulted in significant short-term localized Dissolution Surface WL changes. <br />NSI's goal is to maintain stable or downward trending WL with target level of a maximum of <br />532' to maintain desired differential piezometric head difference between the B-Groove <br />(527') and the Dissolution Surface (533'). Potential water movement would be downward <br />and limit upward migration of high TDS/bicarbonate water toward protected aquifers. <br />Dedicated Remote Down-Gradient or Maxi-Pad Monitoring Wells <br />Wells established to monitor down-gradient at the remote site or maxi-pad are: <br />Wells <br />IRI-7-7 <br />IRI-6 <br />IRI-4 <br />IRI-8 <br />IRI-5 <br />A uifer <br />Dissolution <br />B-Groove <br />A-Groove <br />Perched <br />Perched <br />The maxi-pad wells had open hole completions initially, which may have commingled aquifers <br />for up to ten years. The remote down-gradient or maxi-pad wells were recompleted in August <br />1990 and water quality samplers installed in September 1990. Initial water quality results <br />indicated a mixture of water across all four aquifers, which did not compare to other monitoring <br />sites. Note the final well (IRI-5) on this site was recompleted July 1991. <br />During recompletion, field water quality analysis indicated <1,000 umhos/cm conductivity for the <br />Perched aquifer and >20,000 umhos/cm conductivity for the Dissolution Surface aquifer, and <br />59 <br />