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3.0 GROUND -WATER QUALITY <br />Appendix B presents the ground -water quality data for the Trapper Mine. This appendix <br />tabulates 2008-2017 data in Table B-1 and presents TDS and sulfate plots versus time to convey <br />changes in the major constituent water quality (see attached CD in Appendix D for all historical <br />data). <br />Appendix B also presents the 2008-2017 spring and seep water -quality data (see attached <br />CD in Appendix D for all historical data). Water quality for the springs and seeps are included in <br />this section because their source is ground water. Section 3.6 presents a discussion of the spring and <br />seep water -quality data. <br />3.1 TOTAL DISSOLVED SOLIDS (TDs) <br />Figures B-1 through B-7 present plots of the TDS concentrations for the Trapper Mine <br />wells. The wells have been grouped together based on aquifers. <br />Figure B-1 presents the TDS concentrations versus time for two QR aquifer wells GD -2 and <br />GD -3. Well GD -3 is a backfill well in the QR aquifer. TDS concentrations had been fairly steady <br />the previous eleven years in well GD -3 but have increased in 2010 and 2011 then declined in 2012 <br />and very gradually increased in 2013 through 2017. The fluctuation in this backfill aquifer is well <br />within natural ranges and may be very similar to variations that would have occurred in the QR <br />aquifer at this location. Some of the TDS in the backfill aquifer may be due to leaching from the <br />backfill material. The TDS in this backfill aquifer is greater than it is downgradient in the R Coal at <br />GD -2 which overall increased in concentrations in 2008 through 2017. This is likely the movement <br />of higher concentration from the GD -3 area to well GD -2. <br />Trapper Mining Company 3-1 <br />2017 Annual Report <br />