Laserfiche WebLink
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 -8 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 three QR aquifer wells GD -2, <br />GD -3 and GE -1. Well GD -3 is a backfill well in the QR aquifer. TDS concentrations have been <br />fairly steady for the last eight years in well GD -3. The fluctuation in this backfill aquifer is well <br />within natural ranges and may be very similar 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 overall slightly decreased in 2006 but has been fairly steady for several years. The <br />TDS in well GE-1 in the first half of 2006 was at a similar level to the concentration in well GD -2. <br />The previous higher concentrations in well GE -1 could be due to upgradient QR mining, but also is <br />within natural fluctuations. <br />Trapper Mining Company 3 -1 <br />2006 Annual Report <br />