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Well GP-7 <br />Water Quality and Field Parameters <br />• <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well GP-7 Baseline' 2008 Water Year <br /> <br />Description <br />Units <br />Minimum <br />Maximum <br />Mean <br />519/2008 <br />6/6/2008 <br />8/20/2008 Enviro- <br />Chem MDL <br />Field Parameters <br />Water Level Depth <br />feet <br />30.9 <br />30.4 <br />48.2 <br />Electrical Conductivity pmhos/cm 1621 1693 1464 <br />H SU 6.76 7.15 7.18 <br />Temperature (°C) °C 10.8 10.6 10.7 <br />Comment <br />Laboratory arame ers <br />Name of Certified Lab Enviro-Chem <br />Lab Reference # 08/1502 <br />Sample Date 8/20/2008 <br />Lab Test Date 8/22-8/28 <br />Sampled B P. Holder <br />Alkalinity (Total CaC03) mg/I <br />Aluminum, dissolved m /I <br />Ammonia m /I <br />Anions me /I <br />Arsenic, dissolved m /I <br />Arsenic, total m /I <br />Bicarbonate m /I <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m g/1 <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /I <br />Chloride <br />Conductivity m /I <br />mhos/cm <br />1333.2 <br />1 <br />Copper, dissolved m /l <br />Hardness m /l <br />Hydroxide <br />Iron, dissolved <br />Iron, total m /I <br />m /I <br />m /I <br />0.086 <br />3.108 <br />0.01 <br />0.01 <br />Lead, total m /I <br />Magnesium, dissolved m /I <br />Manganese, dissolved m /I <br />Manganese, total m /I <br />Mercury, total m /1 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I <br />Nitrogen, ammonia <br />H m /I <br />SU <br />7.25 <br />0.001 <br />Phosphate m /l <br />Phosphorus Ortho , dissolved m /I <br />Potassium, dissolved m 11 <br />Selenium, dissolved m /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. <br />Sodium, dissolved m /I <br />Sulfate m /I <br />TDS Ratio talc. <br />TDS Calc. <br />TDS <br />TSS m /I <br />m g/1 <br />m /I <br />858 <br />387 <br />2 <br />2 <br />Zinc, dissolved mg/I <br />'Baseline and WY 2000 data adapted from WWE (2001). <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />3Zero values denote readings below lab detection levels (MDL). <br />G-4 <br />West Elk Mine <br />2008 Annual Hydrology Report <br />HydroGeo, Inc.