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downslope and downgradient of A and E pits in native ground, slightly greater than 1000' <br />downgradient of the A pit. The wells are completed in the 20 Mile, U, KLM, and HI aquifers, <br />respectively. GF1 and GF3 are flov<7ng wells. Well GF2 previously flowed until the casing was <br />extended in 1985. Water levels in the GF1 (Figure A-14) sharply declined in 1994. Water levels <br />in this deep aquifer would not be expected to quickly respond to a low precipitation event. Water <br />levels in well GF2 (Figure A-15) have been very stable for the last few years. The 20 Mile and U <br />aquifers both lie beneath the coal horizons. The GF3 water level had been fairly steady from ] 988 <br />through 1993, with a significant decline in the last three years. The August, 1993 value maybe due <br />to a measurement error. Water levels in well GF4 have been quite stable. <br />Well GFS is completed in "HI" backfill and is located approximately 2800' WSW of GF4. <br />Figure A-18 shows a recovery trend from late 1992 through the 3rd quarter of I994. This is possibly <br />a delayed response to the higher precipitation in 1993. Well GF7 is 3300' east of GFS and is also i <br />completed in the equivalent back-f"ill. Figure A-20 shows that the water levels have remained fairly <br />uniform since ]993 even ~s1th the decline in precipitation in 1994. The storage of water in the <br />backfill aquifer and partially saturated zone above the water table may delay the effects of a dry <br />year. Wells at undisturbed sites had water levels that remained fairly steady. The GF7 response is <br />considered a natural response to variations in recharge to this backfill aquifer. A small amount of <br />recovery from the A pit mining in this area may still be occumng. <br />Wells GF6 and GF11 are completed in the QR aquifer and "QR" backfill, respectively. <br />They aze located downgradient ofthe inactive E pit. GF11 is 1150' upslope and upgradient of GF6. <br />In 1994, both wells experienced similar water level increases between the 1st and 2nd quarter, as <br />• <br />2-6 <br />