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Surface Water Summary. Flow values from 005, 006, 009 and 017 were <br />below average this year. The flow values for 012, 015 and 016 were above <br />average. NPDES Site 009 did not flow at all. TDS values at all NPDES <br />Ponds (except 006 and 017) are decreasing and the TDS trend at NPDES <br />Ponds 005 and 015 are stable. TDS values at downstream surface water <br />Sites WSH7, WSHF1, WSD5 and WSSF3 are increasing. All Spoil Springs, <br />with the exception of Spoil Spring 2 and 3 are displaying decreasing TDS <br />trends. The TDS trend is stable at upstream site WSH9. NPDES discharges <br />are normally suitable for livestock and irrigation, but sometimes exceed <br />water quality 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 />2310 <br />1813 <br />986* (no flow October) <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 />25 <br />