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Well SOM 23-H-4 <br />Water Quality and Field Parameters <br />• <br />• <br />0 <br />Mountain Coal West Elk Mine <br />Monitoring Location: Well SOM 23-H-4 <br /> <br />Descri tion Units Baseline' <br /> <br />Minimum Maximum Mean ° 2008 Waiter Year <br />Enviro- <br />5/5/2008 6/7/2008 8122/2008 Chem MDL <br />Field Parameters <br />Water Level Depth feet 138.9 137.4 137.6 <br />Electrical Conductivity pmhos/cm 1931 1898 1699 <br />H SU 7.68 7.79 7.93 <br />Temperature C 9.9 10.4 11.4 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab Enviro-Chem <br />Lab Reference # 08/1518 <br />Sample Date 8/22/2008 <br />Lab Test Date 8/22-9/11 <br />Sampled B P. Holder <br />Alkalinity (Total CaCO3) mg/I 1030 1140 1073 956.9 2.000 <br />Aluminum, dissolved m /I <br />Ammonia m /I -0.01 -0.01 -0.01 1.23 0.05 <br />Anions me /I 21.2 21.8 21.5 14.32 calc <br />Arsenic, dissolved m /I 0.001 0.003 0.002 0.049 0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 1000 1090 1031 <br />Boron, dissolved m /I 0.27 0.30 0.28 0.41 0.01 <br />Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.006 0.001 <br />Calcium, dissolved m /I 4.6 5.3 4.8 4.2 0.1 <br />Carbonate m /I 21 63 42 <br />Cation - Anion Balance % -2.2 1.4 0.7 2.92 calc <br />Cations me /I 20.3 22.0 21.2 1.475 calc <br />Chloride m /I 6 7 6 1.67 0.1 <br />Conductivity mhos/cm 1730 2000 1840 1536.5 1 <br />Copper, dissolved m /I <br />Hardness m /I 18 21 19 75.9636 calc <br />Hydroxide m /I -2 -2 -2 <br />Iron, dissolved m /I -0.02 0.75 0.28 0.1 0.01 <br />Iron, total <br />Lead, dissolved m /l <br />m /I 0.63 <br />0.0003 1.75 <br />0.0017 1.01 <br />0.0010 4.34 <br />0.006 0.01 <br />0.005 <br />Magnesium, dissolved m /I 1.6 1.9 1.7 15.9 0.1 <br />Manganese, dissolved m /I -0.005 0.061 0.044 0.03 0.005 <br />Manganese, total m /I 0.051 0.070 0.060 0.145 0.005 <br />Mercury, dissolved m /I -0.0002 0.0002 0.0001 0.000038 0.000025 <br />Mercury, total m /I <br />Molybdenum, dissolved m /l <br />Nitrate as N dissoloved m /I -0.02 0.07 0.02 0 0.13 <br />Nitrate/Nitrite as N m /I -0.02 0.07 0.02 0 0.13 <br />Nitrite as N dissoloved m /I -0.02 -0.01 -0.01 0.01 0.01 <br />Nitrogen, ammonia m /I 0.40 0.51 0.45 <br />H SU 8.4 8.5 8.5 8.35 0.1 <br />Phosphate m /I -0.03 0.21 0.13 0 0.08 <br />Phosphorus Ortho , dissolved m /I -0.01 0.07 0.04 0 0.01 <br />Potassium, dissolved m /I 2.1 3.5 2.6 3.43 0.1 <br />Selenium, dissolved m /I -0.002 -0.001 -0.001 0 0.001 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 46.3 48.7 47.5 0.296 calc <br />Sodium, dissolved m /I 450 487 470 564 0.1 <br />Sulfate m /I -10 20 8 11.94 2 <br />TDS Ratio calc. 0.95 1.04 1.01 5.42 calc <br />TDS Calc. m /I 1110 1170 1143 1564.36 2 <br />TDS m /I 1110 1190 1146 1124 2 <br />TSS m /I <br />Zinc, dissolved mg/I -0.01 0.03 0.01 0.008 0.005 <br />Baseline 2005 <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />3 Zero values denote readings below lab detection levels (MDL). <br />4 Average (mean) value calc using 112 of detection limit for readings below lab detection limits unless all readings are below lab detection limit <br />e Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)] ' 100 <br />6 Simnert data June 6 2005 for total iron, * indicates data 6ncl qijnPct data ** indicates calc exicuciqnn qusnect data <br />G-13 <br />West Elk Mine <br />2008 Annual Hydrology Report <br />HydroGeo, Inc.