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EFCI Southfield Mine - 2008 Annual Hydrology Report April 15, 2009 <br />TABLE 6 <br />MW-66 WATER QUALITY DATA <br />PARAMETER UNITS 2008 Sample Dates: <br />5/1912008 12/2/2008 2008 <br />AVERAGE 1984 -2008 <br />MIN. AVE. MAX. <br />pH (lab) units 8.2 8.2 8.2 7.2 8.0 8.8 <br />Conductivity at 25C umhos/cm 1880 1840 1860 770 1849 2320 <br />Temperature (field) de C 15.3 12.3 13.8 9.4 14.4 19.0 <br />Solids, total dissolved m /I 1130 1150 1140 1040 1137 1330 <br />Bicarbonate as CaCO3 m /I 750 777 764 198 735 830 <br />Calcium, dissolved m /I 15.8 16.1 16.0 0.0 14.6 36.0 <br />Chloride m /l 130 140 135 60 149 630 <br />Magnesium, dissolved m /I 3.1 2.8 3.0 2.0 3.0 8.0 <br />Nitrogen, ammonia m g/1 1.97 1.94 1.96 0.00 1.16 2.50 <br />Nitrogen, nitrate nitrite m /I 0.02 0.00 0.01 0.00 0.17 2.66 <br />Phosphorus, ortho m /I 0.10 0.12 0.11 0.00 0.09 0.64 <br />Phosphorus, total m /I 0.07 0.11 0.16 <br />Sodium, dissolved m /I 475 391 433 370 444 543 <br />Sulfate m /I 50 50 50 12 80 587 <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 0.02 0.03 0.03 0.02 0.20 1.81 <br />Manganese, dissolved m /l 0.136 0.136 0.136 0.020 0.116 0.162 <br />Mercury, dissolved m /l 0.0000 0.0002 0.0033 <br />Selenium, dissolved m /I 0.000 0.001 0.012 <br />Zinc, dissolved m /I 0.03 0.03 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 />2008 AHR.doc WP Page 16