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Spring G-20 <br />Water Quality and Field Parameters <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Spring G-20 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/26/2007 5/24/2007 Q< 8/22/2007 <br />Field Parameters <br />Flow m 2.00 1.00 0.50 <br />Electrical Conductivity µmhos/cm 918 958 932 <br />H SU 8.19 8.18 8.10 <br />Temperature °F OF 52.9 56.1 70.0 <br />Temperature °C °C 11.6 13.4 21.1 <br />Comment <br />Laboratory ParameterS3 <br />Name of Certified Labe ACZ <br />Lab Reference # L62832-05 <br />Sample Date 5/24/2007 <br />Lab Test Date 5/29-6/9 <br />Sampled B <br />Alkalinity (Total CaCOA mg/I <br />Aluminum, dissolved m /I <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total rn /I <br />Bicarbonate m /I 452 657 539 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I 81 81 81 <br />Carbonate m /I <br />Cation - Anion Balance m /I <br />Cations me /I <br />Chloride m /I 1.2 10 5.3 <br />Conductivity µmhos/cm 970 1090 1023 861 <br />Copper, dissolved m /I <br />Hardness m /I 193, 416 318 <br />Hydroxide m /I <br />Iron, dissolved m /I 0.05 0.01 0.07 <br />Iron, total m /I 0.32 0.05 9.44 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I 33.3 33.3 33.3 <br />Manganese, dissolved m /I 0.002 0.002 0.002 <br />Manganese, total m /I 0.06 0.005 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N m /I <br />Nitrate/Nitrite as N m /I 0.01 0.05 0.03 <br />Nitrite as N m /I <br />H lab SU 7 8.1 7.7 8.5 'H <br />Phosphate m g/11 <br />Phosphorus Ortho , dissolved m /I 0.15 0.02 <br />Potassium, dissolved m /I <br />Selenium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 2.31 2.73 2.52 <br />Sodium, dissolved m /I 102 102 102 <br />Sulfate m /I 16 117 81 <br />TDS Ratio talc. <br />TDS Calc. m /I <br />TDS m /I 502 686 598 540 <br />TSS m /I 19.6 3.5 226 <br />Zinc, dissolved mg/I <br />' Baseline pre -2000 data, adapted from WWI= (2001) <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3Negative 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 (PQL). <br />West Elk Mine <br />E-19 2007 Annual Hydrology Report HydroGeo, Inc.