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Well RAV-4b Water Quality and Field Parameters • Mountain Coal West EIk Mine Monitoring Location Well RAVdb Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/11/2003 6/5!2003 9/29/2003 Field Parameters Water Level De th feet 602.62 601.42 601.38 Electrical Conductivi umhos/cm 1480 3000 2362 2760 2670 3140 H SU 8.4 9.1 8.8 8.04 8.05 7.81 Tem erasure OC 9.9 21.3 19.2 70.4 68.2 73.7 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L43179-03 Sam le Date 9/29/2003 Lab Test Dale 102-10/29 Sam led B Alkalini Tofal CaCO3 m /I 684 1510 7115 1520 Aluminum, dissolved m /I Ammonia m /I 0.21 1.83 1.02 0.02 Anions me /I 32.3 A[senic, dissolved m /I 0 0.31 0.03 0.0004 Arsenic, total m /I 0.002 0.002 0.002 Bicarbonate m /I 649 1510 1076 1500 Boron, dissolved m /I 1.67 Cadmium, dissolved m l 0 0 0 -0.01 Calcium, dissolved m /I 0.9 8.5 2.3 4.9 Ca[bonate m !1 0 80 38.8 20 Cation -Anion Balance % -3.2 4 1.5 -0.5 Cations me /I 28.3 32.3 30.8 32 Chloride m /I 21 59 41.2 67 Conductivi umhos/cm 2500 2700 2582.5 2500 Co er, dissolved m /I Hardness m /I 5 32 13.1 17 H droxide m l 0 0 0 -2 Iron, dissolved m I 0 2.64 0.305 0.99 Iron, total m /I 6.34 22.5 13.21 4.53 Lead, dissolved m /I 0 0 0 -0.04 Ma nesium, dissolved m /I 0.7 2.7 1.68 1.1 Man anese, dissolved m /I 0 0.435 0.05 0.04 Man anese, total m /I 0.094 0.384 0.21 0.126 Mercu ,dissolved m /I 0 0 0 -0.0002 Mol bdenum, dissolved m /I Nitrate/Nitrite as N m /I 0.06 Nitro en, ammonia m /1 0.67 1.89 1.14 0.73 H SU 7.3 8.9 8.28 8.3 Phos hate m /I o 0 0 0.18 Phos horns Ortho ,dissolved m /I o 0.051 0.008 0.06 Potassium, dissolved m /I 3.1 3.6 3.4 3.5 Selenium, dissolved m /I 0 0 0 -0.001 Selenium, total m /I Sodium Absor tion Ratio SAR calo. 29.9 128 79.6 76.7 Sodium, dissolved m /I 339 727 573.5 714 Sulfate m /I o 20 2.5 -10 TDS Ratio talc. 1.01 TDS Calc. m /I 1710 TDS m /I 770 1710 1193 1730 TSS m /I 38 192 72.7 Zinc, dissolved m /I o 0.08 0.007 0.07 ACZ -ACZ Labs, Steamboat S rin s, Colorado ' Standard is for reference ur ses onl NA - not a livable NM -not measured NR -not re orted West Elk Mine G-16 2003 Annual Hydrology Report HydroGeo, Inc.