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EFCI Southfield Mine - 2010 Annual Hydrology Report <br />May 30, 2011 <br />TABLES <br />MW-23 WATER QUALITY DATA <br />PARAMETER UNITS 2010 Sample Dates: <br />06/21/10 12/07/10 2010 <br />AVERAGE 1979 - 2010 <br />MIN. AVE. MAX. <br />H (lab) units 8.5 8.5 8.5 6.2 8.2 8.9 <br />Conductivity at 25C umhos/cm 1160 1080 1120 210 1004 2820 <br />Temperature field de C 16.1 13.8 15.0 10.0 14.7 24.5 <br />Solids, total dissolved m /I 720 710 715 156 649 1870 <br />Bicarbonate as CaCO3 m /I 362 329 346 150 350 1100 <br />Calcium, dissolved m /I 36.9 41.4 39.2 2.2 9.2 56.8 <br />Chloride m /I 21 22 22 3 16 24 <br />Magnesium, dissolved m /I 8.4 8.9 8.7 0.0 1.3 13.2 <br />Nitrogen, ammonia mg/I 0.09 0.07 0.08 0.00 0.25 5.50 <br />Nitrogen, nitrate nitrite m I 0.22 0.36 0.29 0.04 0.37 0.64 <br />Phosphorus, ortho m /I 0.06 0.02 0.04 0.00 0.06 0.23 <br />Phosphorus, total m /I 0.00 0.06 0.07 <br />Sodium, dissolved m /I 205 231 218 29 244 652 <br />Sulfate m /I 179 176 178 10 174 348 <br />Arsenic, dissolved m /I 0.0000 0.0014 0.0050 <br />Cadmium, dissolved m /I 0.00 0.00 0.01 <br />Iron, dissolved m /l 0.03 0.00 0.02 0.00 0.86 24.20 <br />Manganese, dissolved m /I 0.015 0.108 0.062 0.000 0.033 0.697 <br />Mercury, dissolved m /I 0.0000 0.0000 0.0005 <br />Selenium, dissolved m /I 0.000 0.002 0.053 <br />Zinc, dissolved m /I 0.00 0.03 0.24 <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 13