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Yampa River before it is diverted and used for irrigation. No irrigation <br />exists on Grassy Creek below the PSCM. Due to the relative amount of <br />dilution by additional water from both sources, the ambient water <br />qualities of Fish Creek and the Yampa River are the dominant factors in <br />determining their suitability for irrigation. Water discharged from the <br />PSCM is, however, used for livestock watering. <br />TDS values at NPDES2 and NPDES3 are decreasing. TDS values at NPDES4 <br />appear to be stabilizing. At lower Grassy Creek Site YSG5, the TDS trend <br />is decreasing. Of the eight spoil springs monitored, five 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 lower Grassy Creek Site YSG5 were below the PHC <br />predicted values. The winter snowpack (as estimated from data at the <br />NCDC`s Hayden Station) for this year was 78% above the average. NPDES <br />Sites 002 and 003 exhibited annual average flows above the historic <br />averages, with the flow out of 002 being a record high. <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 />NEI <br />