2008-06-27_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' 2007 Water Year Description Units Minimum Maximum Mean 4/25/2007 5/24/2007 8/22/2007 Q ° Field Parameters Water Level Depth feet 39.6 38.1 52.4 Electrical Conductivity µmhos/cm 633 1121 1073 Fi S U 7.01 7.16 7.13 Temperature (?) OF 59.7 51.1 50.9 Temperature (?) °C 10.6 10.5 Comment Laboratory Parameters 3 Name of Certified Lab ACZ Lab Reference # L64626-07 Sample Date 8/2212007 Lab Test Date 8/27-9/6 Sampled B Alkalinity (Total CaCO3) mg/I Aluminum, dissolved m /I 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 /I Cation - Anion Balance % Cations me /I Chloride m /I Conductivity µmhos/cm 1480 Copper, dissolved m /I Hardness m /I Hydroxide m /l Iron, dissolved m /I 0.19 Iron, total m /I 0.67 Lead, dissolved m /l Magnesium, dissolved m /I Manganese, dissolved m /I Manganese, total m /l Mercury, total m /l Molybdenum, dissolved m /I Nitrate/Nitrite as N m /l Nitrogen, ammonia m /I E H S U 8. Phosphate m /l Phosphorus Ortho , dissolved m /I Potassium, dissolved m q/1 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 CI/[ TDS m /I 880 TSS m /I 132 Zinc, dissolved mg/l Baseline andWY 2000 data adapted from WWE (2001). 2 ACZ Labs, Steamboat Springs, Colorado 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). West Elk rvnne G-3 2007 Annual Hydrology Report HydroGeo, Inc.