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1 <br />reestablished. However, the majority of the 1988 season was spent developing <br />a stage rating curve for the channel cross section with flow measurements <br />being taken on a sporadic basis rather than in conjunction with .water quality <br />1 sampling periods. Instantaneous flow measurements were taken during 1989 in <br />conjunction with water quality samples taken at TR-D, except for the October <br />sampling period. Between the sampling periods of September and October in <br />1989, beaver activity both above and below TR-b has occurred causing the <br />location of TR-b to become part of an inundated beaver pond. As such, it is <br />doubtful that this location or any location along the downstream portion of <br />stream channel near the permit boundary can be retrieved from the beavers and <br />' used as a flow monitoring station. <br />Surface Water Quality <br />The general characteristics: temperature (Figure 1), pH (Figure 2) and <br />' specific conductivity (Figure 2) exhibit the same trends as found during the <br />baseline studies. Temperature follows the seasonal trend established during <br />' baseline. However, it is interesting to note that the period of record does <br />appear to suggest a general warming of the creek waters. Trout Creek remained <br />,~ alkaline throughout the year with slight variations in pH occurring <br />seasonally. Specific conductivity shows the same trend as the baseline <br />' studies, as expected. <br />Total Dissolved Solids (TDS) concentrations in Trout Creek show the <br />expected pattern of increasing levels as stream flow passes the mine area and <br />then begins to improve downstream with the introduction of inflow from <br />undisturbed areas downstream of the active mine. In reviewing the TDS <br />concentrations shown in Figure 3, the trend noticed during the baseline <br />studies is further demonstrated. Peak TDS levels in Trout Creek occur in <br />early spring prior to the period of peak flow. This is caused by the uptake <br />of dissolved solids during the spring runoff from the portion of the watershed <br />in which the Edna Mine is located. Although TDS concentrations in the mine <br />runoff may be quite high when compared to concentrations occurring above the <br />mine, the discharge of this runoff is small relative to that of Trout Creek so <br />a large increase in the Trout Creek discharge is not observed. As previously <br />noted, sampling was resumed at TR-C in April 1985. The TDS concentrations in <br />i <br />