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EFCI Southfield Mine -Year 2006 Annual Hydrology Report April 25, 2007 <br />TABLE 5 <br />MW-10 WATER QUALITY DATA I <br /> Sample Dates 1979 - 2001 I <br />Parameter Units <br />June <br />December <br />Average <br />Min. <br />Ave. <br />Max. <br />pH (lab) units Discont. Discont. 6.8 7.7 8.6 <br />Conductivity at 25C umhos/cm 614 910 1310 ' <br />Temperature (field) de C 12.0 14.9 25.0 <br />Solitls, total dissolved m /I 340 595 976 <br />Bicarbonate as CaC03 mg/I 196 280 376 <br />Calcium, dissolved mg/1 4.5 37.1 84.0 <br />Chloride m /I 4.0 10.0 40.0 <br />Ma nesium, dissolved m /I 2.10 7.06 17.00 <br />Nitro en, ammonia m /I 0.20 6.99 23.30 <br />Nitro en, nitrate nitrite m /I 0.00 0.58 14.40 <br />Phosphorus, ortho m /I 0.000 1.302 2.520 <br />Phosphorus, Total m /I 0.000 0.040 0.100 <br />Sodium, dissolved m /I 89 154 320 <br />Sulfate m /I 78 160 362 <br />Arsenic, dissolved m /I 0.000 0.000 0.001 <br />Cadmium, dissolved m /I 0.000 0.000 0.006 <br />Iron, dissolved m /I 0.000 0.627 8.000 <br />Man anese, dissolved m /! 0.000 0.100 0.980 <br />Mercury, dissolved m /I 0.000 0.000 0.001 <br />Selenium, dissolved m /1 0.000 0.001 0.026 <br />Zinc, dissolved m /I 0.000 0.029 0.124 <br />Notes: <br />1 . Zero data values =parameter was analyzed for but not detected. <br />2. 81ank data field = no data. <br />3. MW-10 has been dry from Sept. 1996 to present except for March 2001(historic averages based on previous years <br />when samples could be obtained) <br />4. Monitorin discontinued in Oct. 2003 <br />6 41 712 0 0 6 annual hyd rpt.doc NWCC INC. Page 17 <br />