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discharged from the Seneca II Mine is, however, used for livestock <br />watering. <br />TDS values at NPDES 002 and 003 are increasing at a moderate rate while <br />TDS values at NPDES 004 and 008 are increasing slightly and appear to be <br />stabilizing. On lower Grassy Creek (SSG2), TDS values are increasing. <br />Of the ten spoil springs monitored, two exhibit an increasing EC trend, <br />six are exhibiting decreasing EC trends, while two display a stable EC <br />trend. NPDES discharges are normally suitable for livestock and <br />irrigation, but sometimes exceed water quality standards for aquatic <br />life. <br />A 74 mg/1 increase in TDS was predicted by the PHC for Fish Creek in <br />June, while a 30 mg/1 increase was observed at Site SSF13. TDS values <br />at lower Grassy Creek (SSG2) were above predicted values, most likely <br />due to lower than normal stream flows. The annual precipitation for this <br />year was below average, and all four NPDES sites exhibited annual <br />average flows below the historic averages. <br />American Public Health Association (Ed.) 1985. "Standard Methods for <br />the Examination of Water and Wastewater", 16th Edition, Washington, D.C. <br />Brakensieh and others. <br />Agricultural Hydrology". <br />Buchanan and Sumers. 1968 <br />1979. "Field Manual for Research in <br />"Stage Measurements at Gaging Stations" <br />Colorado Dept. of Health. August 2005. "Regulation No. 31, The Basic <br />Standards and Methodologies for Surface Water" <br />Colorado Dept. of Health. December 2005. "Regulation No. 33, <br />Classification and Numeric Standards for the Upper Colorado River Basin" <br />Colorado Dept. of Health. November 2004. "Regulation No. 41, The Basic <br />Standards for Ground Water" <br />22 <br />• <br /> <br />r~ <br />