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continued changes of the stream channel resulting from the 1989 flood a _ M <br />/~~ ~~('/ <br />meaningful record for analysis was unable to be developed. ,jam a re rC C~ n~ <br />~pU I~aXP <61 ~ec:~ <br />S, fa- Wa Opal; v d <br />~'"~ L ~ T r 7~' <br />~~ccqq~,o~ ~~~ ~~ <br />Trout Creek ~~~(I 0.~ ( ~~ <br />Total Dissolved Solids (TDS) concentrations in Trout Creek show the <br />expected pattern with increasing levels as stream flow passes the Mine area <br />and then begins to improve downstream with the introduction of inflow from <br />undisturbed areas downstream of the mine. In reviewing the TDS concentrations <br />shown in Figure 2, the trend noticed during the baseline studies is further <br />~~fi. 11 <br />demonstrated. Peak TDS levels in Trout Creek occur in early spring prior to .~,.,r~~-f <br />the period of peak flow. This is caused by the pickup of dissolved solids <br />during the spring runoff from the portion of the watershed in which the Edna <br />Mine is located. Although TDS concentrations in the mine runoff may be quite <br />high when compared to concentrations occurring above the mine, the discharge <br />of this runoff is small relative to that of Trout Creek so a large increase in <br />the Trout Creek discharge is not observed. As previously noted, sampling was <br />resumed at TA-C in April 1985. The TDS concentrations in Trout Creek along the <br />mine reach the highest levels at this point. This is not unexpected and as <br />mentioned in the baseline study, the cause for the most elevated TDS levels <br />occurring at TA-C are related to the relative positions of TR-C and TA-D to <br />the active mining area. All values for TDS, except one, are consistent with <br />the baseline samples. The sample taken at TR-C (TDS = 1658 mq/1) in December <br />of 1985 appears to be an anomaly, perhaps the result of a laboratory <br />analytical error as TR-D does not reflect an influx of TDS (370 mg/1) and is <br />essentially equal to the level found at TA-H (374 mq/1). <br />Total Suspended Solids (TSS) show a continuing decrease each year from 1984 <br />(Figure 2), As previously discussed, the rapid snow melt and flooding which <br />occurred in 1984 caused some rather dramatic changes to the stream channel. <br />The TSS values obtained during 1987 suggest most of the reaches along Trout <br />