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• Water levels for wells GF-2 and GF-4 are presented in Figure A-9. Water levels <br />in these wells have been quite stable for a number of years. The U aquifer lies beneath the <br />coal horizons. Mining occurred south of well GF-4 in the early 1980's and seems to have <br />made the water levels in this area of the HI aquifer very steady. Water levels in the <br />upgradient unconfined backfill aquifer do not fluctuate as much as the confined HI aquifer. <br />Figure A-10 presents water levels for wells GF-3 (KLM aquifer) and Coy <br />(alluvium). Smail increases were observed at GF-3, probably due to increased precipitation <br />observed during 1995 and 1996. Water levels at Coy have gradually increased since late <br />1995 due to the significant increase in precipitation during 1995 and 1996. The unconfined <br />alluvial aquifer responds gradually to recharge changes. <br />Wells GF-6 and GF-11 are completed in the OR aquifer and QR backfill, <br />respectively. They are located downgradient of the inactive E pit. GF-11 is 1150 feet <br />upslope and upgradient of GF-6. In 1995 and 1996, both wells experienced similar water- <br />level increases (see Figure A-11). These increases observed in both wells are probably <br />due to more recharge in 1995 and 1996. The water-level response in this backfill well <br />responds similar to the confined QR aquifer. <br />The GP-1 and GP-2 wells (Figures A-12 and A-13) are located in an undisturbed <br />area near the eastem boundary of the PA. They provide a natural baseline for the QR and <br />KLM aquifers. Overall, the water levels in well GP-1 increased during 1995 and 1996 in <br />response to an increase in precipitation, while levels in well GP-2 gradually declined during <br />1996. <br />Figure A-12 also presents water levels for GP-7 and GP-8, which are located very <br />near the eastem boundary of the PA. They are completed in the KLM and HI aquifers and <br />2-7 <br />