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at Sites YSGF5 and YSG5. Average flow values this year were below <br />historic averages at all NPDES sites. <br />Water discharged from the Yoast Mine is not used directly for <br />irrigation. Indirectly, although, water discharged from the mine is <br />significantly diluted by water from Grassy Creek, Sage Creek, or the <br />Yampa River before it is diverted and used for irrigation. Due to the <br />relative amount of dilution, the ambient water qualities of Grassy <br />Creek, Sage Creek, and the Yampa River are the dominant factors in <br />determining their suitability for irrigation. Water discharged from the <br />Yoast Mine is, however, used for livestock watering. NPDES discharges <br />are suitable for livestock and irrigation, but sometimes exceed water <br />quality standards for aquatic life. <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 />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 />EPA. 1976. "Quality Criteria for Water" <br />15 <br />