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Spring G-16 <br />Water Qualitv and Field Parameters <br />is <br />• <br />E ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />Mountain Coal West Elk Mine <br />Monitoring Location Spring G-16 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/2512007 5/30/2007 Qa 8/22/2007 <br />Field Parameters <br />Flow m 3.46 16.34 3.75 <br />Electrical Conductivity µmhos/cm 303 668 678 <br />H SU 8.17 7.99 7.98 <br />Temperature °F OF 50.3 45.9 48.6 <br />Temerature °C °C 9.2 <br />Comment <br />Laboratory ParameterS3 <br />Name of Certified Labz ACZ <br />Lab Reference # L63002-04 <br />Sample Date 5/30/2007 <br />Lab Test Date 6/5-6/18 <br />Sampled B <br />Alkalinity (Total CaC03) mg/I <br />Aluminum, dissolved m /I <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I 241 441 307 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /I 55.2 55.9 55.6 <br />Carbonate m /I <br />Cation - Anion Balance m /I <br />Cations me /I <br />Chloride m /I 2 12 5 <br />Conductivity µmhos/cm 529 1120 691 585 <br />Copper, dissolved m /I <br />Hardness m /I 160 453 220 <br />Hydroxide m /I <br />Iron, dissolved m /I 0.08 0.01 0.02 B <br />Iron, total m /I 4.63 0.56 0.10 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I 15.1 15.8 15.3 <br />Manganese, dissolved m /I <br />Manganese, total m /I 0.07 0.01 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N), dissolved m /I <br />Nitrate/Nitrite as N m /I 0.07 0.16 0.1 <br />Nitrite as N), dissolved m /I <br />H SU 7.1 8.2 7.7 8.5 H <br />Phosphate m /I <br />Phosphorus Ortho , dissolved m /I 0.19 0.04 <br />Potassium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 1.4 2 1.8 <br />Sodium, dissolved m /I 58.1 64.5 61.3 <br />Sulfate m /I 18.2 200 51.6 <br />TDS Ratio calc. <br />TDS Cale. m /l <br />TDS m /I 274 700 349 360 <br />TSS m /I 194 21 -5 U <br />Zinc, dissolved mg/I <br />Baseline pre -2000 data, adapted from WWE (2001) <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte cone detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />E-10 2007 Annual Hydrology Report HydroGeo, Inc.