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III IIIIIII IIIIII III Doc Date:12111/2001 <br />sss <br />~`X,~ <br />~ 3.0 GROUND-WATER QUALITY <br />Appendix B presents the ground-water quality data for Trapper <br />Mine. Table B-1 tabulates the available ground-water quality data for <br />Trapper monitoring wells. Total dissolved solids (TDS) was selected <br />as the parameter to discuss trends of major constituents. <br />3.1 TDS <br />TDS is a measurement of the total dissolved minerals in water. <br />It typically correlates well to constituents which make up the <br />majority of the dissolved solids and, therefore, is a good indicator <br />of trends for the constituents. Conductivity is typically a good <br />indicator of TDS and in turn a good indicator of some major <br />constituents. The first series of pages, in Table B-1 of Appendix B, <br />for each well presents the TDS, conductivity, and sum of major <br />constituents (DSSUM), along with several other parameters. DSSUM was <br />calculated by adding the concentrations of the major cations and the <br />major anions, except for one-half of the bicarbonate which is not <br />added because this concentration is evaporated during the measurement <br />of TDS. This allows a comparison of TDS and DSSUM, which is a good <br />check on the TDS and major constituent measurements. The second <br />series of parameters presented in Table B-1 includes values of the <br />charge balance (BALNC) of the major constituents. BALNC is calculated <br />as the difference of the cations to anions in meq/1 divided by their <br />,,~ sum times 100. BALNC is also a good indicator of accuracy of major <br />3-1 %~ ' <br />