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1 <br /> <br />Trout Creek along the mine reach the highest levels at this point. This is <br />not unexpected and as mentioned in the baseline study, the cause for the most <br />elevated TDS levels occurring at TR-C are related to the relative positions of <br />1 TR-C and TR-D to the active mining area. The dilution of TDS concentrations <br />in the stream flow during 1989 are not as pronounced as in the previous few <br />' years. The reason for this is not clearly understood, but perhaps it is due <br />to an increase in farming activities along the western side of Trout Creek in <br />the vicinity of the Edna Mine. All values for TDS, except one, are consistent <br />1 with the baseline samples. The sample taken at TR-C (TDS = 1658 mg/1) in <br />December 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. <br />Total Suspended Solids (TSS) show a general continuing decrease in <br />concentration from 1984 (Figure 3). As previously discussed, the flooding <br />which occurred in 1984 caused some rather dramatic changes to the stream <br />channel. The TSS values obtained during 1988 and 1989 suggest the reaches <br />along Trout Creek that were affected during the high flows of 1984 have again <br />stabilized with TSS values being consistent with values obtained during <br />' baseline sampling. The samples taken in late May of 1988 suggest some bank <br />caving may still have been occurring during peak flow periods in the spring. <br />This is indicated by a substantial increase of TSS values occurring at TR-C <br />and TR-D when compared to the other upstream sampling stations. <br />' Calcium (Figure 9) is the dominant cation in Trout Creek with magnesium <br />(Figure 4) and sodium (Figure 6) occurring in lesser concentrations. The <br />relative proportions of these parameters change slightly between the sampling <br />points. 1n previous years, all showed a general increase in concentration <br />with some dilution taking place by the time the water passed sampling point <br />' TR-D. However, in 1988 and 1989, no dilution in the concentrations occurred <br />between sampling points TR-C and TR-D,except late 1989, suggesting that inflow <br />' from undisturbed areas downstream of TR-C contain approximately the same <br />concentrations of these parameters as runoff from the mine. <br />As noted in previous annual hydrology reports, upstream of the mine on <br />Trout Creek, bicarbonate (Figure 5) is the major anion with sulfate (Figure 5) <br />concentrations increasing rapidly along the mine area to become predominating <br />' downstream. The sulfate levels increase is most markedly noticed prior to the <br />peak flow period of Trout Creek as are TDS levels in general. This increase <br /> <br />