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Middle Sylvester Gulch Surface Water duality and Field Parameters • • • Mountain Coal West Elk Mine Monitoring Location M. Sylvester Gulch Baseline 2002 Water Year Descri lion Units Minimum Maximum Mean 4/14/2002 6/18/2002 9/26/2002 Field Parameters Flow cfs Electrical Conductivi umhos/Cm 1222 1913 4030 H SU 8.6 8.64 7.84 Tem erature oC 12.7 17.9 12.7 Comment O.G =0.11 Partial List Anal Laborato Parameters Name of Certified Lab ACZ ACZ ACZ Lab Reference # L37001-03 L37347-03 L38680-OS Sam le Date 4/30/2002 6/18/2002 9/26/2002 Lab Test Date 6/21-7/21 9/28-10/18 Sam led B GV GV GV Alkalini Total CaC03 m A 348 756 1700 Aluminum, dissolved m /I -0.03 -0.03 0.05 Anions me /I 10.7 20.2 41 Arsenic, dissolved m /I Arsenic, total m /I -0.0005 0.001 0.005 Bicarbonate m /I 448 310 649 1420 Boron, dissolved m /I 0.19 0.69 1.88 Cadmium, dissolved m /I -0.003 -0.003 -0.005 Calcium, dissolved m /I 35.5 12.9 9.6 Carbonate m /I 17 107 284 Cation -Anion Balance m /I 6.6 D.7 -4.2 Cations me /I 12.2 20.5 37.7 Chloride m !I 3 10 5 35 60 158 Conductivi umhos/cm 480 800 606 1120 1730 Co er, dissolved m /I -0.01 -0.01 -0.01 Hardness m /I 159 234 194 187 91 53 H droxide m /I -2 -2 -2 Iron, dissolved m /I 0.4 0.1 0.02 0.05 Iron, total m /1 0.05 10.5 2 0.13 0.19 lead, dissolved m /I Lead, total m /I 0.0003 0.0003 0.0153 Ma nesium, dissolved m /I 23.8 14.3 7 Man anese, dissolved m /I 0.011 -o.oos o.ooa Man anese, total m /I 0.56 0.05 0.012 -0.005 0.219 Mercu ,total m /I -0.0002 -0.0002 -0.0002 Mol bdenum, dissolved m A -0.01 -0.01 0.02 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.08 0.02 13.5 -0.02 0.49 Nitrite as N ,dissolved m /I H SU 7.35 8.70 8.08 8.4 8.8 Phos hate m /I -0.03 -0.03 0.09 Phos hOrus Ortho ,di55olved m /I 0.875 0.11 -0.005 0.007 0.03 Potassium, dissolved m /I 2.9 4 5.6 Selenium, total m /I -0.002 -0.002 -0.003 Sodium Absor tion Ratio SAR talc, 2.29 3.02 2.7 6.16 19.5 50.3 Sodium, dissolved m !I 191 423 830 Sulfate m /I 28.2 80 46.1 130 160 120 TDS Ratio talc, TDS Calc. m /I TDS m /I 3.68 584 381 730 1120 TSS m /I 4.2 5740 419 -5 6 Zinc, dissolved m /I -0.01 0.01 0.01 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 C-4 2002 Annual Hydrology Report HydroGeo, Inc.