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Well SOM-23-H-2 <br />Water Quality and Field Parameters <br />• <br />• <br />C7 <br />G-21 <br />Mountain Coal West Elk Mine <br />Monitoring Location: SOM 23-H-2 Baseline' 2009 Water Year <br />Description Units Minimum Maximum Mean <br />Field Parameters <br />Water Level Depth feet 359.0 360.0 359.3 <br />Electrical Conductivity µmhos/cm 1850 2300 2070 <br />pH SU 7.68 8.01 7.85 <br />Temperature Oc <br />Comment Casing Compromised <br />Laboratory Parameters' <br />Name of Certified Lab <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaCOO mg/I 924 2560 1206 <br />Aluminum, dissolved m /I <br />Ammonia m /I -0.01 0.01 0.01 <br />Anions me /I 18.8 23.5 19.8 <br />Arsenic, dissolved m /I -0.001 -0.001 -0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 908 2440 1149 <br />Boron, dissolved m /I 0.71 1.52 1.34 <br />Cadmium, dissolved m /I -0.005 -0.005 -0.005 <br />Calcium, dissolved m /I 4.1 12.5 10.7 <br />Carbonate m /I -2 146 57 <br />Cation - Anion Balance % -0.8 2.7 1.5 <br />Cations me /I 18.9 24.8 20.4 <br />Chloride m /l 5 6 6 <br />Conductivity µmhos/cm 1550 1910 1678 <br />Copper, dissolved m /I <br />Hardness m /I 18 58 49 <br />Hydroxide m /l -2 -2 -2 <br />Iron, dissolved m /I 0.38 17.50 4.64 <br />Iron, total m /I 6.74 5s90* / 235-. 1045'/ 76- <br />Lead, dissolved m /I -0.0001 0.0044 0.0014 <br />Magnesium, dissolved m /I 1.8 6.5 5.5 <br />Manganese, dissolved m /I 0.025 0.068 0.044 <br />Manganese, total m /I 0.055 11.6 2.081 <br />Mercury, dissolved m /I -0.0002 -0.0002 -0.0002 <br />Mercury, total m /I <br />Molybdenum, dissolved m /I <br />Nitrate as N dissolved m /I -0.02 0.22 0.04 <br />Nitrate/Nitrite as N m /I -0.02 0.23 0.05 <br />Nitrite as N dissoloved m /I -0.01 0.01 0.01 <br />Nitrogen, ammonia m /I 0.78 15.10 2.98 <br />H SU 8.3 8.8 8.5 <br />Phosphate m /I -0.03 0.15 0.06 <br />Phosphorus Ortho , dissolved m /I -0.01 0.05 0.02 <br />Potassium, dissolved m /I 2.9 3.7 3.3 <br />Selenium, dissolved m /I -0.001 0.001 -0.001 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 23.5 57.8 29.7 <br />Sodium, dissolved m /I 396 552 426 <br />Sulfate m /I -10 20 7 <br />TDS Ratio calc. 0.86 1.03 0.96 <br />TDS Calc. m /I 996 1330 1071 <br />TDS m /I 970 1140 1018 <br />TSS m /I <br />Zinc, dissolved mg/I -0.01 0.02 0.01 <br />' Baseline 2005 <br />2 ACZ Laboratory, Steamboat Springs, CO <br />3 Negative values denote readings below lab detection levels. <br />4 Average (mean) value calc using 1/2 of detection limit for readings below lab detection limit unless all readings are below detection limit. <br />s use a June 6 005 for total iro : ' indicates data incl s s e dat • " indicate c c xlcu in sus ect data <br />West Elk Mine <br />2009 Annual Hydrology Report HydroGeo, Inc.