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1' <br />4.8.2.4a. OPERATIONAL GROUND-WATER QUALITY, 1981-1986 <br />Operational ground-water quality of Trapper Mine (1980-1986) is presented in <br />Table 4.8-10a. Total dissolved solids (IDS) concentration versus time plots for the <br />operational wells are presented in Figures 4.8-30 through 4.8-49. Well GZ2 has no <br />data for 1986 since the CZ site wells were destroyed by mining as permitted by the <br />Colorado Mined Lands Reclamation Division. Well GZ1 has been dry and little data <br />was available for well GZ3, no plots are presented for these wells. <br />IDS is a measurement of the total dissolved minerals in water. It typically <br />correlates well to constituents which make up the majority of the dissolved solids <br />0 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 seties of pages in Table 4.8-10a presents the IDS, <br />conductivity, and sum of major constituents (DSSUM), along with several other <br />parameters for each well. DSSUM 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 IDS. <br />This allows a comparison of IDS and DSSUM, which is a good check on the IDS 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 />BAL14C is calculated as the difference of the cations to anions in meq/l divided by <br />their sum times 100. BALTC is also a good indicator of accuracy of major <br /> <br />4-233a REVISED FEB 13 '87