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Middle Dry Fork Surface Water Quality and Field Parameters • J • Mountain Coal West Elk Mine Monitoring Location M. Dry Fork Flume Baseline 2002 Water Year Descri lion Units Minimum Maximum Mean 4/25/2002 6/17/2002 9!10/2002 Field Parameters Flow cfs NM Electrical Conductivit umhos/cm 30 480 213 660 101 146 H SU 7.8 6.5 8.2 7.5 7.95 7.57 Tern eratu re oC 3.6 19.8 12 14.6 15.4 18.7 Comment O.G.=0.30 La6orato Parameters Name of Certified Lab ACZ Lab Reference # L37306-OS Sam le Date 6/17/2002 Lab Test Dale 6/20-7/11 Sam led B GV Alkalini Total CaCO3 m /I 34 270 142.000 Aluminum, dissolved m /I 0.07 0.07 0.07 Anions me /I 1.1 1.1 1.1 Arsenic, dissolved m /I Arsenic, total m /I 0.002 0.002 0.002 Bicarbonate m /I 3a 270 142 Boron, dissolved m /I Cadmium, dissolved m /I Calcium, dissolved m /I 6.6 56.6 31.96 Carbonate m /I Cation -Anion Balance m /I -22.2 -22.2 -22.2 Cations me /I 0.7 0.7 0.7 Chloride m /I 4 1 Conductivi umhos/cm 76 76 76 87 Co er, dissolved m /I Hardness m /I 23 208 115 H droxide m /I Iron, dissolved m /I 0.11 0.11 0.11 0.24 Iron, total m /I 0.16 14.2 3.14 2.29 Lead, dissolved m /I Ma nesium, dissolved m /l 1.5 17.6 8.7 Man anese, dissolved m /I 0.029 0.029 0.029 Man anese, total m /l 0.01 0.432 0.11 Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /l 0.57 0.1 NitrdtelNitrite as N m ll 0.57 0.12 Nitrite as N ,dissolved m /I 0.1 0.02 H SU 6.7 6.70 6.7 7.4 Phos hate m /I 0.33 0.33 0.33 Phos horns Ortho ,dissolved m /I 0.166 O.a41 Potassium, dissolved m /I o.5 0.5 0.5 Selenium, total m /I Sodium Absor lion Ratio SAR talc. 0.47 1.19 0.78 Sodium, dissolved m /I 5.9 38.8 19.9 Sulfate m /I 50 25 TDS Ratio talc. TDS Calc. m /I TDS m /I 50 300 172 60 TSS m /I 278 72 48 Zinc, dissolved m /I 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-9 2002 Annual Hydrology Report HydroGeo, /nc.