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3.0 GROUND-WATER QUALITY <br /> Appendix B presents the ground-water quality data for the Trapper Mine. This <br /> appendix tabulates all of the historical data in Table 13-1 and presents TDS and sulfate plots <br /> versus time to convey changes in the major constituent water quality. <br /> Appendix B also presents the spring and seep water-quality data. Water quality <br /> for the springs and seeps are included in this section because their source is ground water. <br /> Section 3.7 presents a discussion of the spring and seep water-quality data. <br /> 3.1 TOTAL DISSOLVED SOLIDS (TDS) <br /> Figures B-1 through B-9 present plots of the TDS concentrations for the Trapper <br /> Mine wells. The wells have been grouped together based on aquifers. Figure B-1 presents <br /> the TDS concentrations for wells GD-1, GD-1(2), GF-1 and GF-2. GD-1, GD-1(2) and GF-1 <br /> are completed in the 20 Mile Sandstone, while GF-2 is completed in the U aquifer. The <br /> data for wells GD-1 and GD-1(2) should be considered to be essentially one monitoring <br /> station for the 20 Mile aquifer and was not sampled for 1998. The TDS in 20 Mile well GF- <br /> 1 does not show a consistent trend with time with typical TDS values being around 500 <br /> mg/1. TDS concentrations in U well GF-2 gradually increased from 1992 through 1995 but <br /> has gradually decreased during the last three years. <br /> Figure B-2 presents the TDS concentrations versus time for three QR aquifer wells <br /> GD-2, GD-3 and GE-1. Well GD-3 is a bacifill well in the QR aquifer. An increasing <br /> concentration in well GD-3 has occurred during the last two years after an overall decline <br /> for the previous two years. The fluctuation in this backfill aquifer is well within natural <br /> ranges and may be very similar to variations that would have occurred in the QR aquifer at <br /> 3-1 <br />