2009-07-01_REPORT - C1980007 (8)

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Upper Dry Fork Alluvial Well Water Quality and Field Parameters • l? u • Mountain Coal West Elk Mine Monitoring Location: Upper Dry Fork Alluvial Well Baseline' 2008 Water Year Description Units Minimum Maximum Mean" 5/11/2008 6/8/2008 8/21/2008 Enviro-Chem MDL Field Parameters Water Level Depth feet 12.89 13.72 15.94 Electrical Conductivity mhos/cm 583 593 602 H Su 7.46 7.93 7.90 Temperature oc 8.0 7.9 9.7 Comment Laboratory Parameters 3 Name of Certified Lab 2 Enviro-Chem Lab Reference # 08/1519 Sample Date 8/22/2008 Lab Test Date 8/22-9111 Sampled B P. Holder Alkalinity (Total CaCO3) mg/1 227 266 248 241.92 2 Aluminum, dissolved m /I Ammonia m /I 0.59 0.05 Anions me /I 5.6 6.2 5.8 1.381 talc Arsenic, dissolved m g/1 -0.0005 0.0006 0.0002 0.026 0.001 Arsenic, total m /I Bicarbonate m /I 227 266 248 Boron, dissolved m /I 0.37 0.01 Cadmium, dissolved m /l -0.005 -0.005 -0.005 0 0.001 Calcium, dissolved m /l 3.2 5.1 3.7 3.46 0.1 Carbonate m /I -2 -2 -2 Cation - Anion Balance % 0.9 3.9 1.9 3.09 talc Cations me /1 5.7 6.7 6.0 1.425 talc Chloride m /I -1 6 4 1.23 0.1 Conductivity mhos/cm 493 509 503 559.4 1 Copper, dissolved m /I Hardness m /I 10 16 12 11.39868 talc Hydroxide m /I -2 -2 -2 Iron, dissolved m /l 0.03 0.49 0.19 0.35 0.01 Iron, total m /I 1.3 25.9 13.6 1.25 0.01 Lead, dissolved m /I -0.04 -0.04 -0.04 0 0.005 Magnesium, dissolved m /I -0.2 0.7 0.4 0.67 0.1 Manganese, dissolved m /I 0.067 0.101 0.081 0.136 0.005 Manganese, total m /1 0.109 0.349 0.229 0.191 0.005 Mercury, dissolved m g/1 -0.0002 0.0015 0.0002 0.00016 0.000025 Mercury, total m /I Molybdenum, dissolved m /l Nitrate as N dissoloved m /I 0 0.13 Nitrate/Nitrite as N m /l 0.04 0.87 0.16 0 0.13 Nitrite as N dissoloved m /I 0.05 0.01 Nitrogen, ammonia m /I -0.05 0.20 0.10 H SU 8.0 8.1 8.0 8.19 0.1 Phosphate m /l 0.1 0.4 0.2 0 0.08 Phosphorus Ortho , dissolved m /l 0.03 0.13 0.06 0.01 0.01 Potassium, dissolved m /I 0.9 2.7 1.8 1.7 0.1 Selenium, dissolved m /I -0.0010 0.0003 0.0003 0 0.001 Selenium, total m /I Sodium Absorption Ratio SAR talc. 16 17 17 0.301 talc Sodium, dissolved m /I 113 144 126 132.6 0.1 Sulfate m /I 30 50 35 9.47 2 TDS Ratio talc. 1 1 1 7.35 talcs TDS Calc. m /I 313 313 313 393.97 2 TDS m /1 290 390 326 365 2 TSS m /I Zinc, dissolved mg/1 -0.01 0.04 0.02 0 0.005 Baseline 2004 2 Enviro-Chem Analytical, Grand Junction, CO 3Zero values denote readings below lab detection levels (MDL). Average (mean) value talc using 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit s Enviro-Chem TDS Ratio calculation is [(TDS - TDS (Calc.)) / TDS)) ' 100 G-7 West Elk Mine 2008 Annual Hydrology Report HydroGeo, Inc.