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1 <br /> <br />while the alluvium in the vicinity of TR-3 intersects stratigraphy below the <br />' Wadge Seam. Alluvium in the vicinity Of TR-9 intersects even lower <br />stratigraphic units than those at TR-3. The influence from contact with the <br />' differing lithologies is not able to be quantified, therefore, differences <br />between the wells may not be responses to mining related activities. <br />' The general characteristics: temperature (figure 7) and pH (Figure S) show <br />the expected trends with temperature exhibiting typical seasonal fluctuations <br />and pH remaining constant over the monitoring period. <br />' Specific conductivity (Figure 8) values for the three alluvial wells have <br />remained fairly constant over the period of record and consistent with values <br />' obtained during the baseline studies. Conductivity values during 1988 for the <br />spoils well WR-1 are similar to previous years with elevated levels caused by <br />' the leaching of various elements continuing within the unconsolidated spoils <br />aquifer as flow passes through. The spring (NPDES discharge point No. 006) <br />associated with the spoils aquifer would be expected to have similar values as <br />' evidenced by comparable TDS concentrations. TDS values (Figure 9) closely <br />follow the specific conductivity for all the wells, as expected. <br />1 Calcium (Figure 9) is the major cation found in all the wells with <br />concentrations of magnesium (Figure 10) and sodium (Figure 11) occurring in <br />1e39er qudntltie9. TR-1.5 generally COntain9 the lowest COnCentrdtiOR9 Of <br />cations with a slight increase occurring downstream at TR-3 and TR-4. WR-1 <br />exhibits a fairly constant concentration of calcium over time, while a <br />' lowering of sodium appears to be offset by an increase of magnesium. During <br />1988, a short-term shift occurred in the relative concentrations of calcium <br />and sodium. The cause of this is unknown, but may be related to the early <br />summer flushing of the spoils from snowmelt infiltration. <br />' Bicarbonate (Figure 10) and sulfate (Figure 11) 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. <br />Dissolved iron and manganese remained at low levels during 1988 as in <br />1 <br />