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6.0 OBSERVED IMPACTS ON THE HYDROLOGIC SYSTEMS OF THE TRAPPER MINE <br />• Water-quality changes in the last few years in the QR aquifer <br />are mainly.. due to natural variations in the recharge rate to the <br />aquifer. Water-level changes in QR aquifer wells, GD2 and GF6, <br />which are close to active mining may have been slightly influenced <br />by mining activities, but are mainly due to natural changes. <br />Water-level changes in these two QR wells are similar to those from <br />QR wells east of the mining activities. Water-level changes in QR <br />well GA1 have responded similar to well GP1, but some of the change <br />is likely due to mining. <br />Upgradient mining can cause water-level rises in wells <br />downgradient of the mining by allowing ground water to flow to the <br />downgradient end of mining quicker. Also, the backfill aquifers <br />are more permeable than the native aquifer which also allows ground <br />• water to flow faster through the backfill material resulting in <br />more water in the aquifer at this location. The input of <br />additional water to the native aquifer at the north end of the <br />mining has decreased the affects mine dewatering has had on water <br />levels in this portion of the aquifer. <br />The water-level changes in the HI aquifer have also been <br />influenced by variations in recharge in the last few years. The <br />mining upgradient of HI wells GB5 and GF4, which occurred several <br />years ago, has been allowing the water levels in the HI aquifer to <br />rise. Some of this rise could be above pre-mine levels due to <br />these wells are downgradient of the mining. The water-levels in <br />this area 'have been fairly: steady the last-three years...'. Water <br />. levels in these two wells may have fully recovered or may have <br />ceased recovery due to the below normal precipitation. <br />6-1 <br />