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Figure A-7 presents water levels for wells GF-1, GF-7 and P-8. These wells are • <br />completed in the 20 Mile, HI backfill and 3rd White Sandstone aquifers, respectively. Well <br />GF-1 was a flowing well but water levels have declined over the last three years to below <br />the top of the casing. Water levels in this deep aquifer would not be expected to quickly <br />respond to either a low or high precipitation event. As with GF-5, well GF-7 (both <br />completed in the HI backfill) gradually declined in water level, likely due to the lower <br />precipitation. The larger storage value in the unconfined backfill aquifer may dampen the <br />effects of dry and wet years. The recovery from the A pit mining in this area may be <br />complete. The water levels in well P-8 were fairy steady in 2000. <br />Water levels for wells GF-2 and GF-4 are presented in Figure A-8. Water levels <br />in well GF-2 have been quite stable for a number of years. The U aquifer lies beneath the <br />coal horizons. A large rise in water level in well GF-4 was observed in the last half of 1999 • <br />after the repair of the casing on September 29, 1999. Water levels declined in the second <br />half of 2000 in well GF-4. Mining occurred south of well GF-4 in the eary 1980's and is <br />expected to limit water-level changes in the HI aquifer near well GF-4. Water levels in the <br />upgradient unwnfined backfill aquifer do not fluctuate as much as the confined HI aquifer. <br />It is also possible that the backfill spring in Johnson Gulch may be limiting the head in the <br />backfill aquifer. <br />Figure A-9 presents water levels for wells GF-3 (KLM aquifer) and Coy (alluvium). <br />The increases in water levels in well GF-3, due to spring recharge, seem to occur later in <br />the year showing a few months lag. Water levels at Coy gradualy decreased in 2000, <br />likely due to the lower precipitation. The unconfined alluvial aquifer responds gradually to <br />recharge changes. • <br />2-6 <br />