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~~~~ <br />3.0 GROIIND-WAT$R QIIALITY <br />Appendix B presents the ground-water quality data for Trapper <br />Mine. Table B-1 (page B-40) tabulates the available ground-water <br />quality data for Trapper monitoring wells. Field conductivity was <br />selected as the primary parameter to discuss trends of major <br />constituents. <br />3.1 FIELD CONDIICTIVITY <br />The 1988 Annual Hydrologic Report included TDS and field <br />conductivity time plots. Since 1989, all annual reports have <br />presented only conductivity plots because conductivity reflects the <br /> same changes in individual wells that could be seen on TDS plots <br /> with few outliers. Conductivity is a good indicator of TDS and <br /> some major constituent concentrations, and is routinely used for <br />this purpose. <br />Figures B-1 and B-2 present the field conductivity versus time <br />plots for wells GA1 and GA2. The conductivity from well GA1 <br />exhibits significant fluctuations over a range from 880 to 1440 <br />µmhos/cm. The general trend is steady to slightly declining. Well <br />GA2 is located near GA1 and screened in the interval immediately <br />above the GA1 completion. Its conductivity plot is similar to GA1, <br />although its conductivity decreased in 1993. <br />Conductivities presented on Figure B-3 present a fairly steady <br />plot of conductivity for well GB2. Figure B-4 presents the <br />conductivity versus time plot for well GB5. Conductivities for <br />~` well GB5 show a stable to slightly increasing trend with variations <br />3-1 <br />