Laserfiche WebLink
well GC-3 show some seasonal effects. Water levels in well GC-2 were overall steady from 1999 to <br /> 2005, while overall gradually increasing in 2006 through 2016 and fairly steady 2017 through 2019. <br /> 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 previous six years, <br /> a gradual decline in 2012 and followed by fairly normal seasonal variations through 2019. <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 first 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 into <br /> 2011 in wells GD-2 and GD-3 before declining for four years and gradually rising in 2016 in well <br /> GD-3 and overall steady in 2017 through 2019 in these two wells. The earlier large water level <br /> declines are thought to be due to drilling for deeper coal in this area. Water levels in 2011 and 2012 <br /> are higher than any historical level in this backfill well. Backfill well GD-3 is approximately 1200 <br /> feet upgradient of well GD-2. Well GD-3 is located topographically higher in the northern side of <br /> the D pit than the GD-2 location. Water-level changes in well GD-3 have been more gradual than <br /> changes in well GD-2. The unconfined backfill aquifer's storage parameter would be much larger <br /> than the storage coefficient for the confined aquifer at GD-2 and, therefore, would be expected to <br /> dampen responses. <br /> Water levels in well GP-9 have been overall steady the last few years. This water-level <br /> 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 <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 five 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 /> Trapper Mining Company 2-5 <br /> 2019 Annual Report <br />