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Well SOM-13 <br />Wn*- (l-11+u -1 Field Paramafwrs <br />• <br />• <br />0 <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-13 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/26/2007 5/23/2007 8/22/2007 <br />Field Parameters <br />Water Level Depth feet 181.8 182.2 182.2 <br />Electrical Conductivity µmhos/cm 935 <br />H S U 7.36 <br />Temperature (?) °F 50.4 <br /> <br /> <br />Comment Bailer Came <br />Up <br />Dry/Sandy 4" Bailer Stuck at 48' <br />btoc. Casing <br />compromised. <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I <br />Aluminum, dissolved m /I <br />Ammonia m /I 0.375 0.487 0.421 <br />Anions me /1 <br />Arsenic, dissolved rn /l <br />Arsenic, total m /I <br />Bicarbonate m /I 460 590 511 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I <br />Calcium, dissolved m /l <br />Carbonate m /I <br />Cation - Anion Balance % <br />Cations me /I <br />Chloride m /I 6 13 10 <br />Conductivity µmhos/cm <br />Copper, dissolved m a/111 <br />Hardness m /I 249 292 264 <br />Hydroxide m /I <br />Iron, dissolved m /I 0 0.027 0.009 <br />Iron, total m /I 0.37 1.07 0.61 <br />Lead, dissolved m /I <br />Magnesium, dissolved m /I <br />Manganese, dissolved m /I 0.006 0.026 0.013 <br />Manganese, total m /l <br />Mercury, total mg/l. <br />Molybdenum, dissolved rn /l <br />Nitrate/Nitrite as N m /I <br />Nitrogen, ammonia m /I <br />H SU 7.15 7.55 7.37 <br />Phosphate m q/1 <br />Phosphorus Ortho , dissolved m /I 0 0.065 0.012 <br />Potassium, dissolved m /l <br />Selenium, dissolved rn /I <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. <br />Sodium, dissolved m /I <br />Sulfate m /I 32.9 77.5 61 <br />TDS Ratio calc. <br />TDS Calc. m /I <br />TDS m /I 512 688 622 <br />TSS m /I <br />Zinc, dissolved mg/I <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 />G-10 <br />West Elk Mine <br />2007 Annual Hydrology Report <br />HydroGeo, Inc.