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<br />1 <br /> <br />' Oak Creek <br />Total Dissolved Solids (TDS) in Oak Creek (Figure 13) show very little <br />difference between the upstream and downstream sampling points. There appears <br />to be no influence on TDS in Oak Creek from discharge originating at the mine <br />' as neither a concentrating nor diluting effect is evident. <br />Total Suspended Solids (TSS) indicate the magnitude of stream realignment <br />' which occurred as a result of the rapid snowmelt in 1984 with continued <br />channel instability occurring in 1985 and 1986 (Figure 13). TSS values for <br />' 1987 suggest the channel has attained some degree of stability, however the <br />inferred stability may be the result of lower spring peak flows from a <br />' relatively mild winter. <br />Total iron (Figure 14) shows the same trend as indicated by the TSS with <br />very little variation in concentrations above and below the tipple facility, <br />' except for one reading obtained in July 1985. The reason for the lingering <br />high value observed at OK-B is unknown, although its source appears to be <br />' related to the value occurring in March of the same year. Dissolved iron <br />(Figure 14) most closely follows the trend noticed in TDS on Trout Creek, in <br />' that the NPDES discharge points have a slight diluting effect during high <br />flows and may exhibit a slight concentrating effect during low flow periods. <br />The general characteristics: pH (Figure 15), electrical conductivity <br />' (Figure 15), temperature (Figure 16) and dissolved oxygen (Figure 16) show the• <br />typical seasonal changes remaining consistent with baseline information. <br /> <br /> <br /> <br /> <br /> <br />