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<br />' obtained during the baseline studies. Conductivity values during 1989 and <br />' 1990 for the spoils well WR-1 begin with elevated levels caused by the <br />leaching of various elements continuing within the unconsolidated spoils <br />aquifer as flow passes through. it is believed the lower values recorded <br />during mid-summer to early fall represent a flushing of the dissolved <br />constituents with an increase being experienced as the flow through the spoils <br />lessens and the in place water stagnates. As previously discussed, the <br />October 1990 specific conductivity values may be suspect due to a malfunction <br />' of the Horiba testing equipment. The trend noticed in specific conductivity <br />is also apparent in all of the major cations and anions. The spring (NPDES <br />discharge point No. 006) associated with the spoils aquifer would be expected <br />t0 have Similar values a9 evidenced by Comparable TDS concentrations. TDS <br />values (Figure 11) closely follow the specific conductivity for all the wells, <br />' as expected. <br />Calcium (Figure 11) is the major cation found in all the wells with <br />' concentrations of magnesium (Figure 12) and sodium (Figure 13) occurring in <br />lesser quantities. TR-1.5 generally contains the lowest concentrations of <br />cations with a slight increase occurring downstream at TR-3 and TR-4. it is <br />expected that the cyclic nature of these parameters beginning to develop in <br />1989 will continue in the future with a buildup in concentrations occurring <br />' during the fall and winter months with a flushing action occurring during the <br />spring and summer. <br />' Bicarbonate (Figure 12) and sulfate (Figure 13) are beginning to show a <br />trend of topological change similar to that observed in the surface waters. <br />Upstream (TR-1.5) of the spoils spring, bicarbonate is the major anion with <br />sulfate concentrations increasing rapidly along the mine area resulting in an <br />' equalization of the sulfate and bicarbonate components occurring downstream <br />(TR-3 and TR-4). This increase may be caused by the spoils spring discharge <br />where leaching of pyritic and organic sulfur occurs as the flow passes through <br />' the spoils. The bicarbonate value for TR-4 of 895 mg/1 obtained during May <br />1990, is believed to be an analytical error as the sample points before and <br />' after the sample date are consistent with earlier trends. The bicarbonate <br />duplicate sample value of 106 mg/1 also suggests that this value is erroneous. <br />Dissolved iron and manganese remained at low levels during 1990 as in <br />previous years. It is interesting that WR-1 contains the lowest values for <br /> <br />