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Figure A-4 presents water levels for wells GF -7 and P-8. These wells are completed in <br />the HI backfill and 3rd White Sandstone aquifers, respectively. Water levels in well GF -7 (see <br />Figure A-4) were steady in the last three years. The water levels in well P-8 declined in 2012 and <br />since have been overall steady. The larger storage value in the unconfined backfill aquifer may <br />dampen the effects of dry and wet years. The recovery from the A pit mining in this area may be <br />nearly completed. <br />Water levels for well GF -4 are presented in Figure A-5. A large rise in water level in well <br />GF -4 was observed in the last half of 1999 after the repair of the casing on September 29, 1999. <br />Water levels overall were fairly similar the last few years in well GF -4. Mining occurred south of <br />well GF -4 in the early 1980's and is expected to limit water -level changes in the HI aquifer near well <br />GF -4. Water levels in the upgradient unconfined backfill aquifer do not fluctuate as much as the <br />confined HI aquifer. The backfill aquifer may prevent the low recharge year from affecting the <br />water level down gradient in the HI aquifer. It is also possible that the backfill spring in Johnson <br />Gulch may be limiting the head in the backfill aquifer. <br />Wells GF -6 and GF -11 are completed in the QR aquifer and QR backfill, respectively. <br />Backfill well GF -11 is located on the downgradient side of the inactive E pit, while well GF -6 is <br />located downgradient of the pit. GF -11 is 1150 feet upslope and upgradient of GF -6. Overall <br />increases in water levels were observed in wells GF -6 and GF -11 for 2008 with similar but smaller <br />seasonal changes observed in 2009 and 2010 (see Figure A-6). Large seasonal changes were <br />observed in 2011 with overall higher water levels. Water levels in the backfill well overall declined <br />in 2012 through 2015 with a small overall rise in 2016 and steady levels in 2017 while the levels <br />were steady down gradient in the QR aquifer. The head in well GF -11 is approximately 16 feet <br />above the head in well GF -6. The water levels in the backfill aquifer may be near fully recovered <br />from mining. <br />Trapper Mining Company 2-6 <br />2017 Annual Report <br />