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`~ A3.0 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 B-1 and presents TDS and conductivity <br />plots versus time to convey changes in the major constituent water quality. TDS and <br />sulfate concentrations have been used in this report, in place of field conductivity, due to <br />the larger amount of variation in the field conductivity data. <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 shows some variation in TDS with time with no significant <br />trend. The TDS in 20 Mile well GF-1 also does not show a consistent trend with time with <br />typical TDS values being around 500 mg/l. TDS concentrations in U well GF-2 gradually <br />increased from 1992 through 1995 but a gradual decrease occurred in 1996. <br />Figure B-2 presents the TDS concentrations versus time for four QR aquifer wells <br />GA-1, GD-2, GD-3 and GE-1. Well GD-3 is a backfill well in the QR aquifer. This plot <br />shows a gradual increasing trend in TDS in well GA-1 from 1994 through 1996 as water is <br />3-1 <br />