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Box Canyon Surtace Water duality and Fieid Parameters • r1 Mountain Coal West Elk Mine Monitoring Location Box Canyon Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/10/2003 6/4/2003 9/18/2003 Field Parameters Flow cfs D D D Electrical Conductivi umhos/cm Ba0 1020 976 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 otal CaCO3 m /I ao1 447 a27 Aluminum, dissolved m /I Aluminum, total m /l 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 o 0.006 0.0012 Bicarbonate m /I 398 447 425 Boron, dissolved m 11 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 o 12 1.9 Cation -Anion Balance m ll -4 3.6 0.02 Cations me /I 9.5 12.23 11.15 Chloride m /I 2 6 4.8 Conductivi umhos/cm 866 968 921 Co er, dissolved m A Hardness m !I 195 283 255 H droxide m /I 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 tt 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 1 0.13 O.a6 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 recov. m /I 0 0.003 0.001 Sodium Absor 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 EIk Mine C•77 2003 Annual Hydrology Report HydroGeo, /nc.