2010-06-30_REPORT - C1980007 (7)

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Lower Dry Fork Alluvial Well Water Quality and Field Parameters • • G-8 Mountain Coal West Elk Mine Monitoring Location: Lower Dry Fork Alluvial Well Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5 519/2009 6/4/2009 8/11/2009 Q 4 Field Parameters Water Level Depth feet 4.19 7.90 6.27 3.97 5.35 9.02 Electrical Conductivity mhos/cm 575 693 626 533 526 536 H SU 6.6 7.1 6.9 7.87 7.36 7.55 Temperature °C 8.6 11.7 16.1 Comment Laboratory Parameters' Name of Certified Lab ACZ Lab Reference # L77515-01 Sample Date 8/11/2009 Lab Test Date 8/14-8/19 Sampled B PH Alkalinity (Total CaC03) mg/I 260 300 272 Aluminum, dissolved m /I Ammonia m /I Anions me /I 5.8 5.8 5.8 Arsenic, dissolved m /I -0.0005 0.0004 0.0003 Arsenic, total m /I Bicarbonate m /I 260 300 272 Boron, dissolved m /I Cadmium, dissolved m /I -0.005 -0.005 -0.005 Calcium, dissolved m /I 38.5 62.6 53.4 Carbonate m /I -2 -2 -2 Cation - Anion Balance % 0.9 3.3 1.7 Cations me /I 5.9 6.2 6.0 Chloride m /I -1 3 2 Conductivity µmhos/cm 459 497 482 480 Copper, dissolved m /I Hardness m /I 186 208 200 Hydroxide m /I -2 -2 -2 Iron, dissolved m /I -0.01 0.83 0.15 0.06 Iron, total m /I 0.08 0.51 0.26 0.43 Lead, dissolved m /I -0.04 -0.04 -0.04 Magnesium, dissolved m /I 10.2 16.0 13.8 Manganese, dissolved m /I -0.01 1.96 0.37 Manganese, total m /I 1.13 2.48 1.72 Mercury, dissolved m /I -0.0002 0.0014 0.0002 Mercury, total m /I Molybdenum, dissolved m /I Nitrate as N dissoloved m /I Nitrate/Nitrite as N m /I -0.02 0.71 0.13 Nitrite as N dissoloved m /I Nitrogen, ammonia m /I -0.05 0.09 0.044 H SU 7.8 8.0 7.9 8.2 H Phosphate m /I -0.030 0.030 0.02 Phosphorus Ortho , dissolved m /I -0.05 0.01 0.01 Potassium, dissolved m /I 2.0 3.1 2.5 Selenium, dissolved m /I -0.0010 0.0001 0.0003 Selenium, total m /I Sodium Absorption Ratio SAR calc. 1.18 1.45 1.32 Sodium, dissolved m /I 35 46 41 Sulfate m /I 20 20 20 TDS Ratio calc. TDS Calc. m /I TDS m /I 250 310 297 310, TSS m /I s e Zinc, dissolved mg/I -0.01 0.03 0.02 Baseline 2004 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. 4 ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL. H - Holding time exceeded; pH is a field test with an immediate hold time. B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). 5 Avera a mean value calc usin 1/2 of detection limit for readings below lab detection limits unless all readings are below lab detection limit. West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.