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Well RAV-4b <br />Water Quality and Field Parameters <br /> <br />r ? <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well RAV-4b Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/25/2007 5/24/2007 8/22/2007 Q 4 <br />Field Parameters <br />Water Level Depth feet 629.0 623.8 613.8 <br />Electrical Conductivity µmhos/cm 1480 3000 2362 6210 <br />H SU 8.4 9.1 8.8 8.75 <br />Temperature (°F) OF 75.0 <br />Temperature (°C) °C 9.9 21.3 19.2 23.9 <br /> <br /> <br />Comment Not enogh <br />H2O For Field <br />Wq <br />Bailer came <br />up dry <br />Laboratory Parameters 3 <br />Name of Certified Lab ACZ <br />Lab Reference # L64613-01 <br />Sample Date 8/2312007 <br />Lab Test Date 8127-9/3 <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I 684 1510 1115 <br />Aluminum, dissolved m /I <br />Ammonia m /I 0.21 1.83 1.02 <br />Anions me /I <br />Arsenic, dissolved m /I 0 0.31 0.03 <br />Arsenic, total m /I 0.002 0.002 0.002 <br />Bicarbonate m /I 649 1510 1076 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I 0 0 0 <br />Calcium, dissolved m /I 0.9 8.5 2.3 <br />Carbonate m /I o 80 38.8 <br />Cation - Anion Balance % -3.2 4 1.5 <br />Cations me /I 28.3 32.3 30.8 <br />Chloride m /I 21 59 41.2 <br />Conductivity µmhos/cm 2500 2700 2582.5 6130 <br />Copper, dissolved m /I <br />Hardness m /I 5 32 13.1 <br />Hydroxide m /I o 0 0 <br />Iron, dissolved m /I o 2.64 0.305 0.4 <br />Iron, total m /I 6.34 22.5 13.21 272 <br />Lead, dissolved m /I o 0 0 <br />Magnesium, dissolved m /I 0.7 2.7 1.68 <br />Manganese, dissolved m /I 0 0.435 0.05 <br />Manganese, total m /I 0.094 0.384 0.21 <br />Mercury, dissolved m /I 0 0 0 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I <br />Nitrogen, ammonia m /I 0.67 1.89 1.14 <br />H lab SU 7.3 8.9 8.28 9.2 H <br />Phosphate m /I o 0 0 <br />Phosphorus Ortho , dissolved m /I 0 0.051 0.008 <br />Potassium, dissolved m /I 3.1 3.6 3.4 <br />Selenium, dissolved m /I 0 0 0 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR talc. 29.9 128 79.6 <br />Sodium, dissolved m /I 339 727 573.5 <br />Sulfate m /I o 20 2.5 <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS m /I 770 1710 1193 4040 <br />TSS m /I 38 192 72.7 2490 <br />Zinc, dissolved mg/I o 0.08 0.007 <br />Baseline andWY 2000 data adapted from WWE (2001). <br />2 ACZ Labs, Steamboat Springs, Colorado <br />3 Negative values denote readings below lab detection levels <br />° ACZ Lab Qualifiers: U - Analyte was analyzed for but not detected at the indicated MDL <br />H - Holding time exceeded; pH is a field test with an immediate hold time. <br />B - Analyte conc detected at a value bet method detection limit (MDL) and practical quantitation limit (PQL). <br />West Elk Mine <br />G-25 2007 Annual Hydrology Report HydroGeo, Inc. <br />i'I