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EFCI Southfield Mine -Year 2007Annual Hydrology Report <br />Apri121, 2008 <br />TABLE 12 <br />OAK CREEK (UPSTREAM) WATER QUALITY DATA <br />(Monitoring Polnt OC-2) <br /> <br />PARAMETER <br />UNITS 2007 Sample Dates: <br />2nd QTR. 4th aTR. 2007 <br />AVERAGE 1997 - 2007 <br />MIN. AVE. MAX. <br /> 05/03/07 11/27/07 <br />H field units 8.6 No Sam le 8.6 7.7 8.4 9.2 <br />Conductiv' field umhoslcm 539 53 323 577 1162 <br />Tem erature field de C 19.5 19.5 3.8 11.4 21.9 <br />Solids, total sus ended m !I 242 242 0 82 290 <br />Solids, total dissolved m 24 470 78 <br />Oil and Grease visual es/no n no 0.0 0.0 0.0 <br />SAR in water 0.74 0.74 0. 0.8 1. <br />Bicarbonate as CaC03 m 145. 213.62 265. <br />Calcium TR m /I 43. 80.72 128. <br />Chloride m 3. 8.31 13.00 <br />Ma nesium TR m 13.90 23.0 36.3 <br />Nitr en, nitrate nitrite m 0. 0.2 0.74 <br />Selenium TR m 0.000 0.001 0.002 <br />Phos horns, ortho m 0. 0.0 0.1 <br />Sodium TR m 15.40 39.3 74. <br />Sulfate m n 50.00 160. 370. <br />Aluminum TR m I 3.87 3.87 0. 2.34 7.8 <br />Arsenic TR m 0.0000 0.0007 0.0030 <br />Cadmium TR m 0. 0.00 0.01 <br />Co r TR m 0.01 0.01 0. 0. 0.01 <br />Iron TR m 0.04 2. 8. <br />Lead TR m 0. 0.00 0. 0. 0. <br />Man anew TR m 0.01 0.07 0.22 <br />Mercu T m I 0.0000 0.0000 0.0003 <br />Mo enum TR m 0. 0.00 0. 0. 0. <br />Zinc TR m I 0. 0.02 0.0 <br />NOTES: <br />1. Zero data values = parameter was analyzed for but not detected. <br />2. Blank data fields = no data. <br />2007 AHR.doC WP <br />Page 24 <br />