Laserfiche WebLink
Changes in these three wells are probably natural. The alluvial aquifer response indicates <br />continuation of above average recharge in 2011 from higher precipitation for the last six years and a <br />gradual decline in 2012 due to less recharge and a small rise in 2013. <br />Figure A -3 presents the static water -level elevations for wells GD -2, GD -3 and GP -9. <br />These wells are completed in the QR, QR backfill and 3rd White Sandstone aquifers. In 2006, water <br />levels in wells GD -2 and GD -3 declined sharply the fast quarter of 2006 and then became fairly <br />steady with a large increase in water level in 2008. Water levels overall gradually rose in 2009 <br />through 2013 in well GD-2 and rose in well GD -3 from 2009 through 2011 before declining in the <br />last two years. The earlier large water level declines are thought to be due to drilling for deeper coal <br />in this area. Water levels in 2011 and 2012 are higher than any historical level in this backfill well. <br />Backfill well GD -3 is approximately 1200 feet upgradient of well GD -2. Well GD -3 is located <br />topographically higher in the northern side of the D pit than the GD-2 location. Water -level changes <br />in well GD -3 have been more gradual than changes in well GD-2. The unconfined backfill aquifer's <br />storage parameter would be much larger than the storage coefficient for the confined aquifer at GD -2 <br />and, therefore, would be expected to dampen responses. <br />Water levels in well GP -9 rose in early 2012 and gradually declined the remainder of the <br />year and very slightly declined in 2013. This water -level change is likely natural in this well. <br />Figure A-4 presents water levels for wells GF -7 and P -8. These wells are completed in the <br />HI backfill and 3rd White Sandstone aquifers, respectively. Water levels in well GF -7 (see Figure A- <br />4) were steady in 2013. 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 nearly <br />completed. The water levels in well P -8 declined in 2012 and were steady in 2013. <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 />Trapper Mining Company 2 -5 <br />2013 Annual Report <br />