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Spring G-49 <br />Watar M iality and Maid Pnrnmatarc <br />• <br />.7 <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Spring G-49 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/27/2007 5/24/2007 Q 4 8/23/2007 <br />Field Parameters <br />Flow m 6.25 6.98 5.29 <br />Electrical Conductivity µmhos/cm 2360 2250 2120 <br />H SU 7.43 7.67 7.21 <br />Temperature °F OF 46.4 46.2 50.4 <br />Temperature °C °C 8.0 7.9 10.2 <br />Comment <br />Laboratory PararneterS3 <br />Name of Certified Labe ACZ <br />Lab Reference # L62830-06 <br />Sample Date 5/24/2007 <br />Lab Test Date 5/30-6/8 <br />Sampled B <br />Alkalinity (Total CaC03) mg/I <br />Aluminum, dissolved m /I 0.06 0.06 0.06 <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I 138 478 395 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I <br />Carbonate m /I <br />Cation - Anion Balance m /I <br />Cations me /I <br />Chloride m /l 2 16, 12 <br />Conductivity µmhos/cm 317 1800 1059 2160 <br />Copper, dissolved m /I <br />Hardness m q/1 81 877 584 <br />Hydroxide m /l <br />Iron, dissolved m /I 0.02 0.08 0.05 -0.02 U <br />Iron, total m /I 0.01 22.6 2.57 -0.02 U <br />Lead, dissolved m /I <br />Magnesium, dissolved M q/1 113 113 113 <br />Manganese, dissolved m /I <br />Manganese, total m /I 0.502 0.056 <br />Mercury, total m /l <br />Molybdenum, dissolved m /l <br />Nitrate as N m /I <br />Nitrate/Nitrite as N m /I 0.35 0.22 <br />Nitrite as N m /l <br />pH SU 7.9 8.3 8.1 8.2 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I 0.032 0.004 <br />Potassium, dissolved m /I <br />Selenium, dissolved m /l <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 2.35 4.59 3.12 <br />Sodium, dissolved m q/1 <br />Sulfate m /I 60 906 633 <br />TDS Ratio talc. <br />TDS Calc. m /I <br />TDS m /l 230 1720 1280 1560 <br />TSS m /l 8 724 366 -5 U <br />Zinc, dissolved mg/I <br />Baseline pre -2000 data, adapted from WINE (2001) <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels <br />° ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit <br />West Elk Mine <br />E-27 2007 Annual Hydrology Report HydroGeo, Inc.