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3.2 TDS <br />TDS is the measurement of the total dissolved minerals in <br />water. It typically correlates well to constituents which make up <br />the majority of the dissolved solids and therefore, is a good <br />indicator of trends for these constituents. Conductivity is <br />typically a good indicator of the TDS and in turn a good indicator <br />of some major constituents. The first series of pages, in Table B- <br />1 (page B-40) of Appendix B, for each well presents the TDS, <br />conductivity and sum of major constituents (DSSUM) along with <br />several other parameters. DSSUM was calculated by adding the <br />concentrations of major cations and the major anions, except for <br />one-half of the bicarbonate which is not added because this <br />concentration is evaporated during the measurement of TDS. This <br />allows a comparison•of TDS and DSSUM, which is a good check on the <br />TDS and major constituent measurements. The second series of <br />parameters presented in Table B-1 (page $-75) includes values of <br />the charge balance (BALNC) of the major constituents. BALNC is <br />calculated as the difference of cations to anions in meq/1 divided <br />by their sum times 100. BALNC is also a good indicator of accuracy <br />of major constituents and values between -10 and 10 are considered <br />good. The TDS concentrations from the Trapper Mine ground-water <br />quality generally compared favorably to the corresponding <br />conductivity values. <br />3.3 pH <br />~1 Field pH is an important parameter to monitor because some <br />3-7 <br />