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EFCI Southfield Mine - 2010 Annual Hydrology Report May 30, 2011 <br />TABLE 4 <br />MW-16 WATER QUALITY DATA <br />PARAMETER UNITS 2010 Sample Dates: <br />06/21/10 12/07110 2010 <br />AVERAGE 1979 - 2010 <br />MIN. AVE. MAX. <br />H lab units DRY DRY DRY 6.8 7.8 8.6 <br />Conductivity at 25C umhos/cm 1190 2322 4980 <br />Temperature field d C 12.0 14.7 19.5 <br />Solids, total dissolved m /I 704 1657 3710 <br />Bicarbonate as CaCO3 m /I 192 538 1100 <br />Calcium dissolved Mg/1 1.1 42.0 220.0 <br />Chloride m /I 6 60 279 <br />Magnesium, dissolved m /I 0.0 6.3 33.7 <br />Nitrogen, ammonia m /I 0.00 0.94 36.00 <br />Nitrogen, nitrate nitrite m /I 0.00 4.13 24.80 <br />Phosphorus, ortho m /I 0.00 0.03 0.20 <br />Phosphorus, total m /I 0.00 0.09 0.31 <br />Sodium, dissolved m /I 197 530 980 <br />Sulfate m /I 51 713 1850 <br />Arsenic, dissolved m /l 0.0000 0.0007 0.0040 <br />Cadmium, dissolved m /l 0.00 0.00 0.01 <br />Iron, dissolved m /I 0.00 0.81 8.80 <br />Manganese, dissolved m /I 0.000 0.029 0.270 <br />Mercury, dissolved m /I 0.0000 0.0001 0.0017 <br />Selenium, dissolved m /l 0.000 0.005 0.053 <br />Zinc, dissolved m /I 0.00 0.04 0.27 <br />NOTES: <br />1. Zero data values used for parameters analyzed for but not detected above MDL. <br />2. Blank data field = no data. <br />3. MW-16 - dry 2001 through March 2003, and 2006 through 2010 <br />(quality values shown are based on all previous years samples) <br />2010 AHR text.doc Page 12