2010-06-30_REPORT - C1980007 (7)

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Well GP-6 Water Quality and Field Parameters • • Mountain Coal West Elk Mine Monitoring Location Well GP-6 Baseline' 2009 Water Year Description Units Minimum Maximum Mean 5/8/2009 5/24/2009 8/12/2009 Q Field Parameters Water Level Depth feet 54.9 53.0 56.8 Electrical Conductivity pmhos/cm 1070 1073 1084 H SU 7.58 7.37 7.54 Temperature °C °C 11.0 10.4 12.5 Comment Laboratory Parameters 3 Name of Certified Lab z ACZ Lab Reference # L77515-08 Sample Date 8/12/2009 Lab Test Date 8/14-8/19 Sampled B PH Alkalinity (Total CaC03) mg/I Aluminum, dissolved m /l Ammonia m /I Anions me /1 Arsenic, dissolved m /I Arsenic, total m /I Bicarbonate m /I Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I Carbonate m /l Cation - Anion Balance % Cations me /l Chloride m /l Conductivity mhos/cm 973 Copper, dissolved m /I Hardness m /l Hydroxide m /I Iron, dissolved m /l 0.18 Iron, total m /I 3.01 Lead, dissolved m /l Magnesium, dissolved m /l Manganese, dissolved m /l Manganese, total m /I Mercury, total I mg/ Molybdenum, dissolved m /I Nitrate/Nitrite as N m /I Nitrogen, ammonia m /I H SU 8.3 H Phosphate m /I Phosphorus Ortho , dissolved m /I Potassium, dissolved m /l Selenium, dissolved m /I Selenium, total m /I Sodium Absorption Ratio SAR calc. Sodium, dissolved m /I Sulfate m /I TDS Ratio calc. TDS Calc. m /I TDS m /l 640 TSS m /I 25 Zinc, dissolved mg/I 'Baseline and WY 2000 data adapted from WWE (2001). 2 ACZ Laboratory, Steamboat Springs, CO 3 Negative values denote readings below lab detection levels. `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). G-3 West Elk Mine 2009 Annual Hydrology Report HydroGeo, Inc.