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Well SOM-C-76 <br />Water Quality and Field Parameters <br />• <br />• <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: Well SOM-C-76 Baseline' 2008 Water Year <br /> <br />Descri tion <br />Units <br />Minimum <br />Maximum <br />Mean ° <br />5/10/2008 <br />6/7/2008 <br />8/2212008 Enviro- <br />Chem MDL <br />Field Parameters <br />Water Level Depth feet 289.3 289.0 293.1 <br />Electrical Conductivity mhos/cm 1910 2500 2970 2530 2600 2600 <br />H SU 5.2 8.2 9.3 7.60 8.05 8.06 <br />Temperature °C 13.3 14.3 14.2 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab E:nviro-Chem <br />Lab Reference # 08/1516 <br />Sample Date 8/22/2008 <br />Lab Test Date 8/22-8/28 <br />Sampled B P. Holder <br />Alkalinity (Total CaC03) mg/I 1294 1503 1860 <br />Aluminum, dissolved m /I <br />Ammonia m /I 0.00 0.64 1.36 <br />Anions me /I 29.6 30.88 32.71 <br />Arsenic, dissolved m /I 0.000 0.000 0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 41 1181 1894 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I 0.000 0.000 0.000 <br />Calcium, dissolved m /I 1.6 2.0 2.3 <br />Carbonate m /I 0 30 186 <br />Cation -Anion Balance % -3.3 -0.45 3.0 <br />Cations me /I 29.30 30.53 31.50 <br />Chloride m /I 0 4 17 <br />Conductivity pmhos/cm 2300 2487 2650 2430.7 1 <br />Copper, dissolved m /I <br />Hardness m /I 6 15 43 <br />Hydroxide m /I 0 0 0 <br />Iron, dissolved <br />Iron, total m /I <br />m /l 0.00 <br />0.00 0.13 <br />5.01 1.00 <br />18.00 0.02 <br />3.23 0.01 <br />0.01 <br />Lead, dissolved m /I 0.00 0.00 0.00 <br />Magnesium, dissolved m /I 0.6 0.8 1.5 <br />Manganese, dissolved m /I 0.000 0.005 0.016 <br />Manganese, total m /I 0.000 0.017 0.145 <br />Mercury, dissolved m /I 0.0000 0.0000 0.0000 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I 0.00 0.16 2.16 <br />Nitrogen, ammonia m /I 0.57 0.65 0.73 <br />H lab SU 7.9 8.4 9.3 8.11 0.001 <br />Phosphate m /I 0.06 0.06 0.06 <br />Phosphorus Ortho , dissolved m /I 0.000 0.068 1.26 <br />Potassium, dissolved m /I 3.6 3.9 4.2 <br />Selenium, dissolved m /I 0.000 0.000 0.000 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 46.1 102.7 128.6 <br />Sodium, dissolved m /I 658 700 756 <br />Sulfate m /I 0 9 180 <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS M /I 1530 1642 2590 1536 2 <br />TSS m /I 7 37 226 21 2 <br />Zinc, dissolved mg/I 0.00 0.00 0.01 <br />' Baseline pre-2000 data, adapted from WWE (2001). Numerous suspect data in baseline summary table. <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />13 Zero values denote readings below lab detection levels (MDL). <br />G-16 <br />West Elk Mine <br />2008 Annual Hydrology Report <br />HydroGeo, Inc.