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~' <br />4.3.2.4a. OFERATZONAL GROUND-WATER QUALITY, 1981-1986 <br />Operational ground-water quality of Trapper Dfine (1980-1986) is presented in <br />Table 4.8-10a. Total dissolved solids TDS) concentration versus time plots for the <br />operational wells are presented in Figures 4.8-30 through 4.8-44. Well GZ2 has no <br />data for 1986 since the GZ site wells were destroyed by mining as permitted by the <br />Colorado Mined Lands Reclamation Division. Well GZI has been dry and little data <br />was available for well G23, no plots are presented for these wells. <br />TDS is a measurement of [he total dissolved minerals in water. It typically <br />correlates well to constituents which make up the majority of the dissolved solids <br />1 <br />and, therefore, is a good indicator of trends for the constituents. Conductivity is <br />typically a good indicator of TDS and in turn a good indicator of some major <br />constituents. The first series of pages in Table 4.8-10a presents the TDS, <br />conductivity, and sum of major constituents (DSSUM), along with several other <br />parameters for each well. DSSUPf was calculated by adding the concentrations of the <br />major cations to the major anions, except for one-half of the bicarbonate which is <br />not added because this concentration is evaporated during the measurement of TDS. <br />This allows a comparison of TDS and DSSUM, which is a good check on the TDS and <br />major constituent measurements. The second series of parameters presented in Table <br />4.8-10a includes values of the charge balance (BALTIC) of the major constituents. <br />BALtiC is calculated as the difference of the cations [o anions in meq/1 divided by <br />their sum times 100. BALNC is also a good indicator of accuracy of major <br />4-233a REVISED FE$ 13 '$7 <br />