Laserfiche WebLink
in well GP -3 in the years just prior to 2005 are probably a function of below normal precipitation <br />during this period. The water level in well GP -4 has also recovered to pre -mine levels but observed <br />variable levels in 2004 through 2017. The decline in the fourth quarter is similar to other large <br />declines observed in this well. <br />Well GMP -1 (Figure A-9) is completed in the HI aquifer to monitor ground -water <br />conditions downgradient of the ash disposal site immediately south in A pit. Water levels became <br />steady in 2001 and stayed fairly steady for the next six years with a small increase in 2006 through <br />2011. A very gradual decline was observed in 2012 through 2017. <br />Figure A-10 also presents water levels for the well COY (alluvium). Water levels at the <br />COY well started to decline in 2009 after seven years of overall rising. Overall this gradual decline <br />has continued through 2016 with a small rise in 2017 but levels are still higher than they were in the <br />1990s. The unconfined alluvial aquifer generally responds gradual to recharge changes. The 2008 <br />and 2009 water -level elevations were larger than the natural high water levels in 1985 and 1986. <br />Well GP -5 is completed in the QR aquifer. GP -5 is immediately downgradient of A pit. <br />Water -level data from 2008-2017 is tabulated in Table A-1 in Appendix A (see attached CD for all <br />historical water -level data). Figure A-11 presents the water level versus time plot, showing a rising <br />trend for the previous six years during the period of above normal precipitation and fairly steady <br />water levels during the 2012 low precipitation year and a small decline in 2014 through 2016 with <br />the slightly above normal precipitation to slightly below normal precipitation. A very gradual rise <br />was observed in 2017. These responses are interpreted to be due to an increase in recharge followed <br />by a decrease in recharge with slightly larger recharge in 2017. These water levels show no <br />response to the higher precipitation in 2005 while a good response in shown to the higher 2006 <br />through 2011 precipitation. This data indicates that a lag of one year in the water level responses in <br />well GP -5 to precipitation may occur. These responses indicate that the mining from the QR seams, <br />Trapper Mining Company 2-8 <br />2017 Annual Report <br />