2008-06-27_REPORT - C1980007 (7)

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Well 96-27-1 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location Well 96-27-1 Baseline 2006 Water Year Description Units Minimum Maximum Mean Field Parameters Water Level Depth feet Electrical Conductivity µmhos/cm 2400 2600 2510 H SU 8.2 8.9 8.5 Temperature °C 16 19.2 17.9 Comment Obstructed Obstructed Obstructed Laboratory Parameters 3 Name of Certified Lab Lab Reference # Sample Date Lab Test Date Sampled B Alkalinity (Total CaC03) mg/I 1310 1480 1400 Aluminum, dissolved m /I Ammonia m /I 0.1 0.1 0.1 Anions me /I 26 6 27.6 27.1 Arsenic, dissolved m /I 0.001 0 Arsenic, total m /I q Bicarbonate m /I 1 1310 1470 1366 Boron, dissolved m /I Cadmium, dissolved m /I 0 0 0 Calcium, dissolved m /I 4.7 7.2 5.7 Carbonate m /I 0 73 31 Cation - Anion Balance % -1.9 4.1 0.8 Cations me /I 25.6 29.5 27.6 Chloride m /I 10 29 14 Conductivity µmhos/cm 2290 2350 2323 Copper, dissolved m /I Hardness m /I 16 24 20 Hydroxide m /I 0 0 0 Iron, dissolved m /I 0 1.32 0.24 Iron, total m /I 0.91 2.54 1.61 Lead, dissolved m /I 0 0 0 Magnesium, dissolved m /I 1 2.1 1.46 Manganese, dissolved m /I 0 0.355 0.062 Manganese, total m /I 0.031 0.059 0.0413 Mercury, dissolved m /I 0 0 0 Molybdenum, dissolved m /I Nitrate/Nitrite as N m /I 0 0.36 0.05 Nitrogen, ammonia m /I 0.84 1.06 0.95 H SU 6.9 8.4 7.9 Phosphate m /I 0 0 0 Phosphorus Ortho , dissolved m /I 0 0.385 0.071 Potassium, dissolved m /I 3.4 3.6 3.5 Selenium, dissolved m /I 0 0 0 Selenium, total m /I Sodium Absorption Ratio SAR talc. 58.5 67.3 63.7 Sodium, dissolved m /I 571 684 649 Sulfate m /I 0 10 3 TDS Ratio calc. TDS Calc. m /I TDS m /I 1080 1650 1487 TSS m /I 66 104 81 Zinc, dissolved mg/I 0 0.37 0.06 Baseline andWY 2000 data adapted from WWE (2001). 2 ACZ Labs, Steamboat Springs, Colorado Negative values denote readings below lab detection levels West Elk Mine G-18 2007 Annual Hydrology Report - HydroGeo, fnc.