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EFCI Southfield Mine - 2010 Annual Hydrology Report May 30, 2011 <br />TABLE 6 <br />MW-65 WATER QUALITY DATA <br />PARAMETER UNITS 2010 Sample Dates: <br />06/21/10 12/07/10 2010 <br />AVERAGE 1984 - 2010 <br />MIN. AVE. MAX. <br />pH (lab) units 8.2 8.3 8.3 7.2 8.0 8.8 <br />Conductivity at 25C umhos/cm 1920 1860 1890 770 1855 2320 <br />Temperature field de C 18.7 12.2 15.5 9.4 14.4 19.0 <br />Solids, total dissolved m /I 1160 1130 1145 1040 1138 1330 <br />Bicarbonate as CaC03 m /I 755 723 739 198 736 830 <br />Calcium, dissolved m /I 15.4 16.5 16.0 0.0 14.7 36.0 <br />Chloride m /I 140 150 145 60 148 630 <br />.Magnesium, dissolved m /I 2.9 3.1 3.0 2.0 3.0 8.0 <br />.Nitrogen, ammonia m /I 1.99 1.91 1.95 0.00 1.21 2.50 <br />Nitrogen, nitrate nitrite m /I 2.43 0.02 1.23 0.00 0.21 2.66 <br />-Phosphorus, ortho m /I 0.13 0.13 0.13 0.00 0.09 0.64 <br />Phos horus, total m /I 0.07 0.11 0.16 <br />Sodium, dissolved mg/I 394 417 406 370 443 543 <br />Sulfate m /I 53 52 53 12 78 587 <br />Arsenic, dissolved m /I 0.0000 0.0007 0.0023 <br />Cadmium, dissolved m /I 0.00 0.00 0.01 <br />Iron, dissolved m /I 0.03 0.00 0.02 0.00 0.19 1.81 <br />Manganese, dissolved m /I 0.158 0.133 0.146 0.020 0.118 0.162 <br />Mercury, dissolved m /I 0.0000 0.0002 0.0033 <br />Selenium, dissolved m /I 0.000 0.001 0.012 <br />Zinc, dissolved m /I 0.00 0.02 0.06' <br />NOTES: <br />1. Zero data values = parameter was analyzed for but not detected. <br />2. Blank data field = no data. <br />2010 AHR text.doc Page 14