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REP37728
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REP37728
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Last modified
8/25/2016 12:16:58 AM
Creation date
11/27/2007 7:50:52 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980001
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
1997 AHR text and data
Annual Report Year
1997
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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Total Dissolved Solids <br />Total Dissolved Solids (TDS) concentrations (Figure 6) in Trout Creek exhibit <br />an expected pattern. As stream flow passes the mine, TDS levels increase while <br />adjacent to the mined areas and then begin to decline downstream due to inflow from <br />undisturbed lands below the active mine. Peak TDS levels in Trout Creek adjacent to <br />the mine occur in early spring prior to the period of peak flow. This is caused by <br />the spring runoff from the portion of the watershed in which the Edna Mine is <br />located. Although TDS concentrations in the mine runoff may be quite high when <br />compared to concentrations occurring above the mine, generally the mine runoff is <br />small relative to Trout Creek's total flow. Therefore, a significant increase in <br />Trout Creek TDS levels is observed only during the initial stages of spring runoff. <br />A comparison of the TDS and Flow indicates that TDS concentrations appear to be <br />directly related to flow volume. <br />The dilution of TDS concentrations in downstream flow since 1988 has not been <br />as pronounced as in previous years. The reason for this is not clearly understood <br />since mining directly above TR-C did not begin until 1990. Since 1990, mining and <br />reclamation has occurred in close proximity to TR-C. As such, dilution of TDS <br />concentrations probably occurs farther downstream of TR-D as runoff from undisturbed <br />areas enters into Trout Creek. Although elevated TDS concentrations have moved <br />downstream in conjunction with mining and reclamation activities, all values for TDS <br />are consistent with the probable hydrologic consequences projections. <br />Calcium/Magnesium/Sodium <br />Calcium (Figure 7) is the dominant cation in Trout Creek with magnesium <br />(Figure 8) and sodium (Figure 9) occurring in lesser concentrations. While the <br />relative proportions of these parameters change slightly between the sampling <br />points, all show peak concentrations coinciding with spring runoff, as would be <br />expected. As with TDS, all three cations show general increases in concentration as <br />the water passes mine area. Additionally, the relative proportion of each <br />constituent remains constant to the other constituents. While trends in their <br />subsequent dilution downstream have yet to form a consistent pattern, little or no <br />dilution in any of the concentrations have occurred between sampling points TR-C and <br />TR-D since 1988. For 1990-1997, it is believed that this was due in part to the <br />Moffat area mining and reclamation activities and, as such, the pattern is <br />anticipated to continue. However, since this occurrence existed prior to the <br />initiation of Moffat mining activity, the trend may also suggest that inflow from <br />undisturbed areas upstream and downstream of TR-C contains approximately the same <br />concentrations of these parameters as runoff from the mine. <br /> <br />10 <br />
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