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~\ present water levels that are very close in water-level elevation <br />for the upgradient backfill and downgradient QR aquifer wells. <br />The water-level rise in HI aquifer well, GB5, in 1984 through <br />1987 is thought to be caused by higher recharge rates and recovery <br />from mine dewatering. The stabilization of water levels in 1988 <br />through 1991 is thought to be caused by a decline in recharge and <br />an offsetting recovery from mining. The rise in water level in the <br />last four years in HI aquifer well, GF4, is thought to be caused by <br />recovery from mining upgradient. Water levels in this portion of <br />the aquifer appear to have stabilized at what could now be above <br />pre-mine conditions due to the input of additional water just <br />downgradient of the mining. <br />Each of the water levels in the three GE wells have been <br />~1 <br />recovering for several years from mine dewatering from the <br />adjacent operation. The rate of rise declined in 1988 and these <br />wells showed some stabilizing in 1989 and 1990. A decline in water <br />levels has been observed in the second and third white sandstones <br />at well GE3 during the last half of 1990 and through 1991. These <br />effects are thought to be due to the greater time since dewatering <br />stopped. It may also be partly attributed to lower recharge rates <br />and/or the mine dewatering that started in C pit (1988) and B pit <br />(December, 1989). <br />Water level rises were observed in 1990 in the HI and KLM <br />wells (GP3 and GP4) downgradient of the A pit mining, The water <br />levels for 1991 have dropped, indicating that the fluctuations are <br />• <br />2-3 <br />