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Lower Sylvester Gulch Surface Water Quality and Field Parameters • r L J • Mountain Coal West EIk Mine Monitoring Location L. Sylvester Gulch Baseline 2003 Water Year Descri lion Units Minimum Maximum Mean 4/13/2003 6/2/2003 9/27/2003 Field Parameters Flow cfs 31.4 31.4 31.4 29.4 52.3 9.3 Electrical Conductivi umhos/cm 620 700 653 1096 1071 3340 H SU B.5 9.7 8.9 8.3 8.19 9.13 Tem erature oC 7.9 10.2 9 51.3 62 58.7 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L41507-15 Sam le Date 6/2/2003 Lab Tesl Date 6/6-6/17 Sam led B Alkalini Total CaCO3 m /I 323 323 323 Aluminum, dissolved m /I 0.03 0.03 0.03 Anions me /I Arsenic, dissolved m /I Arsenic, total m /I 0.001 0.001 0.001 Bicarbonate m /I 315 315 315 Boron, dissolved m /I Cadmium, dissolved m /I 0.003 0.003 0.003 Calcium, dissolved m /I 41 a1 a1 Carbonate m /I 8 8 8 Cation -Anion Balance m I -3.2 -3.2 -32 Cations me /I 7.5 7.5 7.5 Chloride m /I 4 4 4 Conductivi umhos/cm 597 597 597 936 Co er, dissolved m /I 0.01 0.01 0.01 Hardness m /I 179 179 179 H droxide m /I 2 2 2 Iron, dissolved m /I 0.05 0.05 0.05 0.09 Iron, total m /I 0.17 0.17 0.17 2.22 Lead, dissolved m /I 0.04 0.04 0.04 Lead, total m I Ma nesium, dissolved m I 18.7 18.7 18.7 Man anese, dissolved m /I 0.007 0.007 0.007 Man anese, total m /I 0.005 0.005 0.005 Mercu ,total m /I 0.0002 0.0002 0.0002 Mol bdenum, dissolved m /I 0.01 0.01 0.01 Nitrate as N ,dissolved m /I Nitrate/Nitrite as N m /I 0.05 0.05 0.05 Nitrite as N ,dissolved m /I H SU 8.3 8.3 8.3 8.7 Phos hate m /I 0.09 0.09 0.09 Phos horns Ortho ,dissolved m /I 0.031 0.031 0.031 Potassium, dissolved m /I 2.2 2.2 2.2 Selenium, total m I 0.04 0.04 0.04 Sodium Absor lion Ratio SAR talc. 2.89 2.89 2.89 Sodium, dissolved m /I 87.8 87.8 87.8 Sulfate m !I 70 70 70 TDS Ratio talc. TDS Calc. m /I TDS m A aoo 400 400 580 TSS m /I 5 5 5 46 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 rted West Elk Mine C-5 2003 Annual Hydrology Report HydroGeo, Inc.