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Well SO.W-1 Water Quality and Field Parameters • • Mountain Coal West EIk Mine Monitoring Location Well SO.W-1 Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean Field Parameters Water Level De th feet Electrical Conductivi umhos/cm 1680 1900 1790 H SU 9.1 9.9 9.5 Tem erature oC 16.4 17.3 16.7 Comment Obstruction Obstruction Obstruction Laborato Parameters Name of Certified Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalini Total CaCO3 m /I 266 861 772 Aluminum, dissolved m /1 Ammonia m /I 1.23 1.57 1.4 Anions me /I 18.3 19.8 18.9 Arsenic, dissolved m /I 0 0.001 0 Arsenic, total m /l 0.001 0.001 0.001 BlCarbOnate m / 266 737 601 Boron, dissolved m A Cadmium, dissolved m /I 0 0 0 Calcium, dissolved m /I 2.1 2.8 2.6 Carbonate m /I 0 310 171 Cation -Anion Balance % 0.5 2.1 1.3 Cations me /I 19.1 20 19.4 Chloride m /I 14 19 16 Conductivi Umhos/cm 1670 1750 1703 Co er, dissolved m /I Hardness m I 18 30 26 H droxide m /I o 0 0 Iron, dissolved m !I 0.04 0.66 0.3 Iron, total m A 2.59 7.07 a1a Lead, dissolved m /I 0 0 0 Ma nesium, dissolved m /I 3.2 5.5 4.8 Man anese, dissolved m ll 0.054 0.025 0.017 Man anese, total m /I 0.044 0.102 0.067 Mercu ,dissolved m /I o 0 0 Mercu ,total m /I o 0 0 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m /I o 0.15 0.03 Nitro en, ammonia m /I 1.58 2.01 1.71 H SU 9.1 9.2 9.2 Phos hate m /I 0.04 o.oa O.oa Phos horns Ortho ,dissolved m /I 0 0 0 Potassium, dissolved m /1 6.7 7.1 6.9 Selenium, dissolved m /I o 0 0 Selenium, total m /I 0 0 0 Sodium Absor lion Ratio SAR talc. 33.7 40.8 36.4 Sodium, dissolved m /I 398 437 420 Sulfate m /I 40 90 76 TDS Ratio talc. TDS Calc. m ll TDS m /I 930 1100 1007 TSS m /I 0 36 21 Zinc, dissolved m /I 0.04 0.04 0.04 ACZ -ACZ Labs, Steamboat S rin s, Colorado Standard is for reference ur oses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine G-18 2003 Annual Hydrology Report HydroGeo, Inc.