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relative amount of dilution by additional water from both sources, the <br />ambient water qualities of Fish Creek and the Yampa River are the <br />dominant factors in determining their suitability for irrigation. Water <br />discharged from the PSCM is, however, used for livestock watering. <br />TDS values at NPDES3 are decreasing. TDS values at NPDES2 and NPDES4 <br />appear to be stabilizing. At lower Grassy Creek Site YSG5, the TDS trend <br />is increasing. Of the seven spoil springs monitored, four are exhibiting <br />decreasing TDS trends, one displays an increasing trend and two display <br />stable TDS trends. NPDES discharges are normally suitable for livestock <br />and irrigation, but exceeded water quality standards (selenium only) for <br />aquatic life this year. <br />TDS values at NPDES2 and were above the PHC predicted value. However, <br />TDS values at lower Grassy Creek Site YSG5 were below the PHC predicted <br />value. The winter snowpack (as estimated from data at the NCDC's Hayden <br />Station) for this year was 26% below the average. All NPDES Sites <br />exhibited annual average flows below the historic averages. <br />References <br />American Public Health Association (Ed.). 1989. "Standard Methods for <br />the Examination of Water and Wastewater ", 17th 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 />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 />21 <br />