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• <br />3.0 GRODND-WATER QOALITY <br />Appendix B presents the ground-water qualit;y data for Trapper <br />Mine. Table B-1 [page B-40 thro~igh B-1341 tabulates the a•railable <br />gro~ind-water q~zality data £or Trapper mor.itorin.g wells. Field <br />conductivity was selected as the primary parameter to discuss <br />trends of ma.tor constituents. <br />3.1 FIELD COND[JCTIVITY <br />The 1988 Annual H.vdrologic Report inclu,ied TDS and field <br />conductivity time plots. Since 1989, all a:~nua1 r=ports have <br />presented only r_onductivity plots ber_ause conductivity refler_ts the <br />same changes in individual walls that could bey seen on TDS plots <br />• with few o~_itiiers. Conductivity is a good ir..dicater of TPS and <br />some ma.ior r_enstituent concentrations. ar_d is ro~itinei~• 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 had <br />exhibited significant fluctuations during some years and has <br />declined steadil.v in 1992. Additional time is needed to determine <br />if this trend is significant. <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 duri^.a the last few years have remz.inerl fai rly stable. <br />• Changes in this well are thought to be within the range of natural <br />fluctuation but could have been infl~zenr-ed some, by previous mining. <br />3-1 <br />