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EFU Southfield Mine - 2009 Annual Hydrology Report March 10, 2010 <br />TABLE 4 <br />MWA6 WATER QUALITY DATA <br />PARAMETER UNITS 2009 Sample Dates: <br />06/01/09 12/01/09 2009 <br />AVERAGE 1979 -2009 <br />MIN. AVE. MAX. <br />H lab units DRY DRY DRY 6.8 7. 8.6 <br />Conductivity at 25C umhos/cm 1190 2322 4980 <br />Temperature field de C 12.0 14.7 19.5 <br />Solids, total dissolved <br />Bicarbonate as CaC03 m /I <br />mg/l 704 <br />192 1657 <br />538 3710 <br />1100 <br />Calcium, dissolved m 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 <br />Phosphorus, ortho mg/I <br />m /l 0.00 <br />0.00 4.13 <br />0.03 24.80 <br />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 0.00 0.00 0.01 <br />Iron, dissolved mg/l 0.00 0.81 8.80 <br />Manganese, dissolved m /I 0.000 0.029 0.27 <br />Mercury, dissolved m /l 0.000 0.0001 0.0017 <br />Selenium, dissolved m /I 0.000 0.00 0.05 <br />Zinc, dissolved m /I 0.00 0.04 0.2 <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 2009 <br />(quality values shown are based on all previous years samples) <br />2009 AHR.doc WP Page 12