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NPDES Effluent Criteria (Permit No. CO -0000221). <br />No excursions of NPDES limits occurred this year. <br />Surface Water Summary. <br />The flow from site NPDES 016 was above average this year. All other <br />NPDES flow values were below historic averages. TDS values at all but <br />three surface water sites are increasing. TDS values at surface water <br />site WSH9 is stable and NPDES sites 016 and 015 are decreasing. All <br />Spoil Springs, with the exception of Spoil Spring 50 and 5 are <br />displaying increasing TDS trends. NPDES discharges are normally suitable <br />for livestock and irrigation, but sometimes exceed water quality <br />standards for aquatic 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 />2725* <br />2020 <br />1000* <br />Sites WSHF1 and WSSF3 exceeded PHC predictions, and that was by only 198 <br />mg/1 and 324 mg/l respectively. <br />25 <br />