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<br />White Sandstone, were very steady until 1982 when a drop in Water <br />level of .approximately six feet occurred over a two year period. <br />. Water levels the last three years have gradually risen probably due <br />to being downgradient of the mine pit. <br />Well GB5 monitors the HI aquifer at the base of the A pit. <br />Water levels (see Figure A-5)' in this well gradually rose from <br />1984 to March 1988. Water levels during the rest of 1988 and the <br />first half of 1989 remained stable. The water levels for the <br />second half of 1989 have shown a slight decline. The majority of <br />this water-level response is thought to be due to recovery of the <br />aquifer as mining in the A pit moves away from this area. The rate <br />of water-level rise seems to have decreased some since 1987 <br />• indicating a possible stabilizing of water levels. Levels probably <br />recovered from mining in this area much faster due to the high <br />precipitation during 1983 through 1986. The stabilizing of the <br />levels and the slight decline in the last half of 1989 and 1990 <br />could be partially caused by the decline in recharge since 1986 <br />(see Figure 2-1). <br />The GC wells are approximately two and one-half miles from <br />the nearest mining in the H and I coal seams. Well GC1 is <br />completed in the HI aquifer and has shown a considerable amount of <br />water-level fluctuation which is all thought to be natural. <br />Figure A-6 shows that water levels have shown little variation <br />since 1987 indicating very .little change in storage in the HI <br />aquifer in this area. Water levels responded to the increase in <br />• recharge in 1984 and 1985. <br />2-6 <br />