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upstream site WSH9. NPDES discharges are normally suitable for livestock <br />and irrigation, but sometimes exceed water quality standards for aquatic <br />life. <br />In the Probable Hydrological Consequences (PHC, Tab 17, Table 17 -42b) <br />section of the Seneca II -W Mine PAP, predictions were made as to the <br />expected TDS increases to be observed at various surface water sites. <br />The following table outlines these predictions along with this year's <br />observed average values (irrigation season, June - September). <br />Site Predicted TDS values (mg /1) <br />WSHF1 2527 <br />WSD5 2451 <br />WSSF3 676 <br />* indicates value above prediction <br />This year's average TDS (mg /1) <br />1990 <br />1687 <br />810* (no flow August) <br />Only one site, WSSF3 on Sage Creek, exceeded PHC predictions. This high <br />TDS value is most likely due to low snowmelt runoff this year and a dry <br />summer. <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 />23 <br />