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<br />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 aze 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-8 present plots of the TDS concentrafions 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 three QR aquifer wells GD-2, <br />GD-3 and GE-l. Well GD-3 is a backfill well in the QR aquifer. TDS concentrations have been <br />fairly steady for the last seven yeazs in well GD-3. The fluctuation in this 6ackfill aquifer is well <br />within natural ranges and may be very similaz 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 slightly decreased in 2005 but has been fairly steady for several years. The TDS in well <br />GE-lirritailly increased in 2005 and then decreased to below its 2004 level These higher <br />concentrations in well GE-I could be due to upgradient QR mining, but also is within natural <br />fluctuations. <br />Trapper Mining Company <br />2005 Annual Report <br />3-1 <br />