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<br />Total Suspended Solids (TSS) show a general continuing decrease in <br />' concentration from 1989 (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 suggest the reaches along Trout <br />' Creek that were affected during the high flows of 1984 have again stabilized <br />with TSS values being consistent with values obtained during baseline <br />' sampling. The samples taken in late May of 1988 suggest some bank caving may <br />still be occurring during peak flow periods in the spring. This is indicated <br />by a substantial increase of TSS values occurring at TR-C and TR-D when <br />compared to the other upstream sampling stations. <br />Calcium (Figure 4) 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. In 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, no dilution in the concentrations occurred between <br />sampling points TR-C and TA-D suggesting that inflow from undisturbed areas <br />downstream of TR-C contain approximately the same concentrations of these <br />parameters as runoff from the mine. <br />As noted in previous annual hydrology reports, upstream of the mine on <br />' Trout Creek, bicarbonate (Figure S) 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 />is probably caused by early runoff at the mine site leaching pyritic and <br />organic sulfur as flow passes over and through the spoils. Since the flow of <br />' Trout Creek is low at that time, the amount of sulfur is sufficient to cause <br />an ionic shift from a bicarbonate type water to a sulfate type. An <br />equalization in the sulfate-bicarbonate balance occurs downstream as the <br />source of the sulfate (mined areas) is unavailable and dilution by runoff from <br />undisturbed areas is introduced. During periods of higher flow the input of <br />' sulfate is insufficient to shift the anion component to a sulfate type with <br />concentrations of bicarbonate and sulfate being approximately equal at TR-D. <br />Manganese (Figure 6) shows fairly consistent values since the fall of 1981, <br />except during 1984. At that time, a dramatic increase occurred upstream of <br />~~ <br /> <br />