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2.1.2 WATER -LEVEL CHANGES <br />Water -level changes for 2016 are presented in Figures A-1 through A-11 in Appendix A. <br />The table in Appendix A lists data from 2007 through 2016 and the historical data for the Trapper <br />Mine is presented on the attached CD in Appendix D. The wells are grouped on the water -level <br />plots according to aquifer where possible but, in most cases, are grouped by similar water -level <br />elevations. Table A-1 in Appendix A presents a tabulation of the water -level elevations for each of <br />the monitoring wells. Figure 2-1 presents the total annual precipitation at the Trapper Mine from <br />1978 through 2016. Precipitation declined from a high in 1983 to a low in 1988 and had increased <br />again to a peak in 1993 with a below average value in 1994. The years 1995 through 1997 had <br />above average precipitation relative to the Trapper Mine record, while 1998 through 2004 were <br />below. The precipitation in 2005 through 2011 was above or near normal while precipitation in <br />2012 was slightly below the 1988, 1994 and 2002 low precipitation years and 2013 precipitation was <br />equal to the Trapper Mine average while 2014 and 2015 were slightly above and 2016 slightly below <br />normal. Water levels in many of the wells reflect the natural variations in recharge. These changes <br />may lag the actual precipitation events due to the time it takes the head change to move through the <br />aquifer to the monitoring well. <br />Figure A-1 presents water levels versus time for wells GF -5 and P-5. The wells are <br />completed in the HI backfill and 2nd White Sandstone aquifers, respectively. Water levels in well <br />GF -5 slightly rose in 2007 and 2008 and were steady in 2009 and 2010, a small overall rise in 2011 <br />and a very gradual decline in 2012 through 2016. Well P-5 went from being dry in early 2010 to <br />recovering four feet in late 2010 and 2011 but was dry in 2012 through 2016 except for the 4th <br />quarter in each of these years. Well P-5 contained water in two additional quarters in 2014. <br />Trapper Mining Company 2-4 <br />2016 Annual Report <br />