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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 all of the historical data in Table B -1 and presents TDS and sulfate plots versus time to <br />convey changes in the major constituent water quality. <br />Appendix B also presents the spring and seep water - quality data. Water quality for the <br />springs and seeps are included in this section because their source is ground water. Section 3.7 <br />presents a discussion of the spring and 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 and declined in 2012. <br />The fluctuation in this backfill aquifer is well within natural ranges and may be very similar to <br />variations that would have occurred in the QR aquifer at this location. Some of the TDS in the <br />backfill aquifer may be due to leaching from the backfill material. The TDS in this backfill aquifer <br />is greater than it is downgradient in the R Coal at GD -2 which increased in concentration in 2008 <br />through 2012 which could be the movement of higher concentration from the GD -3 area to well GD- <br />2. <br />Figure B -2 also presents a group of three QR wells. Well GF -11 is an equivalent QR aquifer <br />well in the backfill. The 2012 TDS concentrations were fairly steady in backfill well GF -11 and is <br />below its peak in 2001 and 2002. Concentrations in the QR aquifer are monitored downgradient at <br />Trapper Mining Company 3 -1 <br />2012 Annual Report <br />