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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 ma:iority of the dissolved solids and therefore, is .a good <br />indicator of trends for these r_onstituents. lonductivity is <br />typically a good indicator of the TDS and in turn a good indicator <br />of some ma.ior constituents. The First series o£ psges, in Table B- <br />1 ipa~'e B-40i of Appendix B. for each well presents the TI)S, <br />conductivity and sum of m__=..ior r_onstituents fDSSf1M) slung with <br />several other parameters. DSSUM was calculated by adding the <br />concentrations of ma:ior cations .and the ma,ior anions, except for <br />one-half of the bir_.srbonate which is net added ber_.suse this <br />• r_oncentrstien is av.anorated durir.a the rne.=.sur~ment of TDS. This <br />allows a coma..=_ris~=n of TDS and DS~~UM, whir_h is a good check er_ the <br />TUS and major constituent measurements. The second series of <br />parameters presented in Table B-1 (page B-77) includes values of <br />the charge balance iBALNC) of the ma,ior constituents. BALNC is <br />calculated as the dif£ereace of cations to anions in rneq/1 divided <br />by their sum timers 1410. BALNC is also a eood indicator of ar_curacy <br />of ma.ior constit~.re~ts ..=_nd values between -10 .snd 10 are r_or_sidered <br />good. The TD:~ r_encentrations from the Trapper Mine grounrl-water <br />quality generally compared favorably to the r_orresponding <br />conductivity values. <br />• <br />3-7 <br />