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Fish Creek. Also, as can be seen by the information presented in <br />• Table 7-91, mine effluent is significantly diluted when <br />discharged to Fish Creek, so the potential for mine discharges <br />affecting Fish Creek water quality is minor. The results of a <br />comparison of water quality data collected at surface water <br />monitoring sites located within the Fish Creek drainage with <br />irrigation standards are shown in Table 7-95. Irrigation water <br />use standards are more rigorous than livestock standards, so, as <br />would be expected, excursions occurred over a wider range of <br />parameters. As with the livestock standards comparison, aluminum <br />and pH exceedences occurred; other parameters with measurements <br />in excess of the irrigation standards include total iron, <br />manganese (total and dissolved), dissolved solids, and sulfate. <br />The high total iron values seen at Sites 11 and 13 were measured <br />on 05/13/91, and like the aluminum exceedences discussed above, <br />they are probably associated with the high background suspended <br />solids content of Fish Creek on that date. No discernible trend <br />in total iron measurements is present at these sites, although <br />total iron values at Site 13 are generally slightly lower than <br />those at Site 11. Manganese (total and dissolved) exceedences <br />occurred at Sites 6, 11, and NPDES 008; values above the 0.2 mg/1 <br />standard were measured even before mining affected water quality <br />at this site. Manganese values are relatively stable at Sites 6, <br />11, and NPDES 008, and no distinct trends are obvious. <br />Althoug:z increasing sulfate <br />U <br />7-318b Revised 02/05/97 <br />