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EFC1 Southfield Mine - 2008 Annual Hydrology Report April 15, 2009 <br />TABLE 15 <br />OAK CREEK (DOWNSTREAM) WATER QUALITY DATA <br />(Monitoring Point OC-1) <br /> <br />PARAMETER <br />UNITS 2008 Sample Dates: <br />2nd QTR. 4th QTR. 2008 <br />AVERAGE 1997- 2008 <br />MIN. AVE. MAX. <br /> 05/28/08 No Flow <br />pH field units 7.5 7.5 6.1 8.0 9.5 <br />Conductivity (field) umhos/cm 1282 1282 64 612 1416 <br />Temperature field de C 16.9 16.9 4.4 13.3 28.0 <br />Solids, total suspended m l 9 9 0 621 26748 <br />Solids, total dissolved m /I 870 870 200 734 1434 <br />Oil and Grease (visual) es/no no no 0 0 0 <br />SAR in water m /I 3.02 3.02 0.00 1.95 3.83 <br />Bicarbonate as CaC03 m /I 289 0 213 323 <br />Calcium TR m /I 42.00 108.74 191.00 <br />Chloride m /l 20 20 2 12 26 <br />Magnesium TR m /I 7.00 29.35 50.00 <br />Nitrogen, nitrate nitrite m /I 0.44 0.44 0.04 0.68 4.10 <br />Selenium TR m /I 0.000 0.000 0.000 0.001 0.004 <br />Phosphorus, ortho m /I 0.03 0.03 0.00 0.01 0.11 <br />Sodium TR m /I 10.00 102.42 330.00 <br />Sulfate m /I 320 320 1 347 860 <br />Aluminum TR m /I 0.00 10.77 453.00 <br />Arsenic TR m /I 0.0000 0.0120 0.5200 <br />Cadmium TR m /I 0.00 0.00 0.05 <br />Copper TR m g/1 0.00 0.03 0.64 <br />Iron TR m /l 0.00 14.54 610.00 <br />Lead TR m /I 0.00 0.02 0.66 <br />Manganese TR m /I 0.00 0.32 12.20 <br />Mercury TR m /I 0.0000 0.0001 0.0030 <br />Molybdenum TR m /I 0.00 0.00 0.01 <br />Zinc TR m /I 0.00 0.08 2.54 <br />NOTES: <br />1. Zero data values = parameter was analyzed for but not detected. <br />2. Blank data fields = no data. <br />2008 AHR.doc WP Page 28