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Lower Dry Fork Alluvial Well <br />Water Quality and Field Parameters <br />E <br />0 <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location: Lower Dry Fork Alluvial Well Baseline' 2008 Water Year <br /> <br />Description <br />Units <br />Minimum <br />Maximum <br />Mean ° <br />5/512008 <br />6/7/2008 <br />8/22/2008 Enviro-Chem <br />MDL <br />Field Parameters <br />Water Level Depth feet 4.19 7.90 6.27 3.1 4.6 6.39 <br />Electrical Conductivity µmhos/cm 575 693 626 550 556 522 <br />H SU 6.6 7.1 6.9 7.38 7.59 7.57 <br />Temperature °C 7.2 12.1 13.6 <br />Comment <br />Laboratory Parameters <br />Name of Certified Lab Enviro-Chem <br />Lab Reference # 08/1517 <br />Sample Date 8122/2008 <br />Lab Test Date 8/22-9/11 <br />Sampled B P. Holder <br />Alkalinity (Total CaCO3) mg/I 260 300 272 290.1 2 <br />Aluminum, dissolved m /I <br />Ammonia m /I 0.26 0.05 <br />Anions me /I 5.8 5.8 5.8 11.261 talc <br />Arsenic, dissolved m /I -0.0005 0.0004 0.0003 0.029 0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 260 300 272 <br />Boron, dissolved m /1 0.01 0.01 <br />Cadmium, dissolved m /I -0.005 -0.005 -0.005 0.004 0.001 <br />Calcium, dissolved m /I 38.5 62.6 53.4 49.2 0.1 <br />Carbonate m /I -2 -2 -2 <br />Cation - Anion Balance % 0.9 3.3 1.7 -0.93 talc <br />Cations me /I 5.9 6.2 6.0 11.157 talc <br />Chloride m /1 -1 3 2 1.56 0.1 <br />Conductivity µmhos/cm 459 497 482 578.5 1 <br />Copper, dissolved m /I <br />Hardness m /I 186 208 200 189.564 talc <br />Hydroxide m /I -2 -2 -2 <br />Iron, dissolved m /I -0.01 0.83 0.15 0.1 0.01 <br />Iron, total <br />Lead, dissolved m /I <br />m /I 0.08 <br />-0.04 0.51 <br />-0.04 0.26 <br />-0.04 0.32 <br />0.014 0.01 <br />0.005 <br />Magnesium, dissolved m /I 10.2 16.0 13.8 16.2 0.1 <br />Manganese, dissolved m /I -0.01 1.96 0.37 0.019 0.005 <br />Manganese, total m /l 1.13 2.48 1.72 1.08 0.005 <br />Mercury, dissolved m /l -0.0002 0.0014 0.0002 0.000025 0.000025 <br />Mercury, total m /I <br />Molybdenum, dissolved m /l <br />Nitrate as N dissoloved m /I 0 0.13 <br />Nitrate/Nitrite as N m /l -0.02 0.71 0.13 0 0.13 <br />Nitrite as N dissoloved m /l 0.04 0.01 <br />Nitrogen, ammonia m /l -0.05 0.09 0.044 <br />H SU 7.8 8.0 7.9 8.14 0.1 <br />Phosphate m /I -0.030 0.030 0.02 0 0.08 <br />Phosphorus Ortho , dissolved m /I -0.05 0.01 0.01 0 0.01 <br />Potassium, dissolved m /1 2.0 3.1 2.5 2.24 0.1 <br />Selenium, dissolved m /I -0.0010 0.0001 0.0003 0 0.001 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 1.18 1.45 1.32 4.307 talc <br />Sodium, dissolved m /I 35 46 41 46.2 0.1 <br />Sulfate m /I 20 20 20 107.02 2 <br />TDS Ratio talc. 6.94 talc <br />TDS Calc. m /I 514.36 2 <br />TDS m /I 250 310 297 288 2 <br />TSS m /I <br />Zinc, dissolved mg/I -0.01 0.03 0.02 0.006 0.005 <br />Baseline 2004 <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />'Zero values denote readings below lab detection levels (MDL). <br />Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit <br />' Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)] ` 100 <br />G-8 <br />West Elk Mine <br />2008 Annual Hydrology Report <br />HydroGeo, Inc.