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Box Canyon Surface Water Quality and Field Parameters r~ ~J • C~ Mountain Coal West EIk Mine Monitoring Location Box Canyon Baseline 2002 Water Year Descri lion Units Minimum Maximum Mean 4/23/2002 6/18/2002 9/9/2002 Field Parameters Flow cfs D D D Electrical Conductivi umhos/cm 840 1020 916 H SU 7.9 8.9 8.3 Tem erature oC 2 15.9 10 Comment Laborato Parameters Name of Certified Lab Lab Reference # Sam le Date Lab Test Date Sam led B Alkalinit Total CaCO3 m /I 401 447 427 Aluminum, dissolved m /I Aluminum, total m /I 0 0.07 0.025 Anions me /I 10.3 12.1 11.1 Arsenic, dissolved m /I 0 0 0 Arsenic, total m /I 0 0.006 0.0012 Bicarbonate m /I 398 447 425 Boron, dissolved m /I Cadmium, dissolved m /I Cadmium, dissolved m /I 0 0.003 0.0007 Calcium, total m /I 40.2 67.9 58.000 Carbonate m /I 0 12 1.9 Calion -Anion Balance m /I -4 3.6 0.02 Cations me /I 9.5 12.23 11.15 Chloride m /I 2 6 4.8 Conductivi umhos/cm 868 968 921 Co er, dissolved m /I Hardness m /I 195 283 255 H droxide m fl 0 0 0 Iron, dissolved m /I 0 0.02 0.012 Iron, total m /I 0.02 0.44 0.16 Lead, dissolved m /I Ma nesium, dissolved m /I 23 28 27 Man anese, dissolved m /I Man anese, total m /I 0 0.009 0.002 Mercu ,total m /I Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I 0.13 0.48 0.3 Nitrate/Nitrite as N m /I 0.13 0.48 0.3 Nitrite as N ,dissolved m /I H SU 8 8.2 8.1 Phos hate m /I 0 0.03 0.006 Phos horns Ortho ,dissolved m /I 0 0.007 0.002 Potassium, dissolved m /I 2.6 3.3 3 Selenium, total m /I 0.001 0.002 0.002 Selenium, total rewv. m /I 0 0.003 0.001 Sodium Abso lion Ratio SAR talc. 3.43 4.26 3.91 Sodium, dissolved m /I 127 154 141 Sulfate m /I 100 140 118 TDS Ratio talc. TDS Calc. m !I TDS m /I 540 620 586 TSS m /I 0 38 19 Zinc, dissolved m /I 0 0.01 0.002 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-17 2002 Annual Hydrology Report HydroGeo, Inc.