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(June-September). The following table outlines those predictions along <br />with this year's observed averages. <br />Stream Site Predicted TDS values (mg/1) This years average TDS (mg/1) <br />YSGF5 1337 995 <br />NPDES10 3938 2150 <br />NPDESI2 4291 2910 <br />WSSF3 (Seneca II-W site) 2118 770 <br />No sites exceeded the PHC predictions. <br />TDS trends are increasing at NPDES10, NPDESII, NPDESI3, NPDESI4, stream <br />site YSGF5 and Spoil Spring 3. TDS values have decreased at stream site <br />YSG5, NPDESI2 and Spoil Springs 1 and 4. TDS trends have stabilized at <br />stream site YSS2 and Spoil Spring 2. Average flow values this year were <br />above historic averages at NPDESI2 only. <br />0 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 />15