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_~ <br />' 3.0 GROOND-WATSB QOALITY <br />Appendix B presents the ground-water quality data for Trapper <br />Mine. Table B-1 (page B-40 through B-126) tabulates the available <br />ground-water quality data for Trapper monitoring wells. Field <br />conductivity was selected as the primary parameter to discuss <br />trends of major constituents. <br />3,1 FIELD CONDOCTIVITY <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 GAI had <br />exhibited significant fluctuations during some years and has varied <br />over a similar range in 1991. The conductivity versus time plot <br />for well GA2 has also exhibited some variation, but does not show <br />an overall trend for the last ten years. <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 />the well GB5 during the last few years have remained fairly stable. <br />~ Changes in this cell are thought to be within the range of natural <br />3-1 <br />