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dilution by additional water from both sources, the ambient water <br />quality of Fish Creek is the dominant factor in determining their <br />suitability for irrigation. Water discharged from the Seneca II Mine is, <br />however, used for livestock watering. <br />TDS values at NPDES8 are increasing. Spoil Spring 9 also exhibits an <br />increasing TDS trend. Stream sites SSB12 (Lower Bond Creek) and SSF13 <br />(Lower Fish Creek) exhibit decreasing TDS trends. NPDES discharges are <br />normally suitable for livestock, irrigation and aquatic life. <br />A 76 mg /l increase in TDS was predicted by the PHC for Fish Creek in <br />June, while a 20 mg /l increase was observed at Site SSF13 in May. A 74 <br />mg /l increase in TDS was predicted by the PHC for Fish Creek in July, <br />while a 24 mg /l increase was observed at Site SSF13 in August. Site <br />SSF13 was not sampled for TDS in June or July of this year. The winter <br />snowpack (as estimated from data at the NDCD's Hayden Station) for this <br />year was below average, and so was the annual average flow at NPDES8. <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. 1979. "Field Manual for Research in Agricultural <br />Hydrology ". <br />Buchanan and Sumers. 1968. "Stage Measurements at Gaging Stations" <br />Cleveland, W.S. 1979. "Robust Locally Weighted Regression and Smoothing <br />Scatterplots: J.Am.Stat.Assoc. 74, 829 -836. <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 />13 <br />