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<br />t <br />• <br />YW28 3045 <br />YW29 2570 <br />YW30 2570 <br />YWU29 2670 <br />YWU30 2670 <br />YWC33 2721 <br />YAAL14 2036 <br />YGAL15 3548 <br />YGAL16 1296 <br />YSAL1 798 <br />YSAL3 798 <br />* indicates value above prediction <br />870 <br />450 <br />6520* <br />420 <br />800 <br />810 <br />5365* (4900* calculated) <br />5005* (4620* calculated) <br />1335* (1245 calculated) <br />1270* (1152* calculated) <br />1080* (1070* calculated) <br />At Annand Draw alluvial well YAAL14, the average TDS value observed this <br />year was 5365 mg/1. This value exceeds the predicted value of 2036 mg/1. <br />The PHC predictions are based on long-term average values. Individual <br />TDS measurements will vary from year to year due to climatic conditions. <br />What is important is what the long-term trend indicates, and not what <br />the individual values observed are. More data will be needed to <br />determine the long-term TDS trend at this well. <br />At Grassy Creek alluvial well YGAL15, the average TDS value observed <br />this year was 5005 mg/l (4620 mg/l calculated). This value exceeds the <br />predicted value of 3548 mg/1. However, the average TDS value observed <br />this year upstream at Well YGAL16 (Pond 011 alluvium), was only 1335 <br />mg/1. Also, the may-September average TDS from Pond 011 discharges was <br />only 1130 mg/1. Since Pond 011 is the only discharge coming from the <br />Yoast Mine into this portion of Grassy Creek, the elevated TDS values at <br />Well YGAL15 must have a source other than Yoast Mine discharges. <br />At Sage Creek alluvial well YSAL1, the average TDS value observed this <br />year was 1270 mg/l (1152 mg/l calculated). This value exceeds the <br />predicted value of 798 mg/l. However, the average TDS value observed <br />this year upstream at Well YSAL3 (directly below Pond 012), was only <br />1080 mg/1, which exceeds the predicted value of 798 mg/1. <br />7