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<br />3.0 GROUND-WATER QUALITY <br />Append'a B presents the ground-water quality data for the Trapper Mine. This <br />append'a tabulates all of the historipl data in Table B-1 and presents TDS and sulfate plots <br />versus time to convey changes in the major constituent water quality. <br />Append'a 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 />Rgures B-1 through &9 present plots of the TDS concentrations for the Trapper <br />Mine wells. The wells have been grouped together based on aquifers. Fgure &1 presents <br />the TDS concentrations for wells GFl and GF2. The TICS in 20 Mile well GFl does not <br />show a consistent tn~rrd with time with typical TDS values in 2003 near 500 mg/I. TDS <br />concentrations in U aquifer well GF2 gradually increased from 1992 through 1995 then <br />gradually decreased followed by fairly steady concentrations for seven years. <br />Figure B-2 presents tfie TDS concentrations versus time for three QR aquifer wells <br />GD-2, GD-3 and GE-1. Well GD-3 is a bacldill well in the QR aquifer. TDS concentrations <br />have been fairly steady for the last five years in well GD-3. The fluctuation in this bacl6ill <br />aquifer is well within natural ranges and may be very similar to variations that would have <br />occurred in the QR aquifer at this location. Some of the TDS in the bacldill aquifer may be <br />due to leaching from the badcfill material. The TDS in this backfill aquifer is greater than it <br />is downgradient in the R Coal at GD-2 which was also steady in 2003. The TDS in well GE-1 <br />3-1 <br />