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Lower Sylvester Gulch Surtace Water Quality and Field Parameters Mountain Coal West Elk Mine . Monitoring Location L. Sylvester Gulch Baseline 2002 Water Year Descri lion Units Minimum Maximum Mean 4/23/2002 6/18/2002 9/10/2002 Field Parameters Flow cfs 314 31.4 314 15 3.1 40+ Electrical Conductivi umhos/cm 620 700 653 1532 2310 3970 H SU 8.5 9.7 8.9 8.62 8.92 8.14 Tem erature oC 7.9 10.2 9 16.4 12.4 17.9 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # L37347-04 Sam le Date 6/16/2002 Lab Test Date 6/21-7-21 Sam led B GV Alkalini Total CaCO3 m /I 323 323 323 902.000 Aluminum, dissolved m /I 0.03 0.03 0.03 0.06 Anions me /I 23.8 Arsenic, dissolved m A Arsenic, total m /I 0.001 0.001 0.001 0.0018 Bicarbonate m /I 315 315 315 762 Boron, dissolved m /I 0.93 Cadmium, dissolved m /I 0.003 0.003 0.003 -0.003 Calcium, dissolved m /I 41 41 41 8.3 Carbonate m /I 6 6 8 140 Cation -Anion Balance m /I -3.2 -3.2 -3.2 -0.6 Cations me /I 7.5 7.5 7.5 23.5 Chloride m /I 4 4 4 71 Conductivi umhos/Cm 597 597 597 2080 Co er, dissolved m /I 0.01 0.01 0.01 -0.01 • Hardness m /1 179 179 179 64 H droxide m /I 2 2 2 -2 Iron, dissolved m /I 0.05 0.05 0.05 0.13 Iron, total m /I 0.17 0.17 0.17 0.21 Lead, dissolved m /I 0.04 O.Oa O.Oa Lead, total m /I 0.0004 Ma nesium, dissolved m /I 18.7 18.7 18.7 10.6 Man anese, dissolved m /I 0.007 0.007 0.007 -0.005 Man anese, total m 11 0.005 O.ODS D.005 -0.005 Mercu ,total m /I 0.0002 0.0002 0.0002 -0.0002 Mol bdenum, dissolved m /I 0.01 0.01 0.01 -0.02 Nitrate as N ,dissolved m /I Nitrale/Nitrite as N m /I 0.05 0.05 0.05 -0.02 Nitrite as N ,dissolved m /I H SU 8.3 8.3 8.3 8.9 Phos hate m /I 0.09 0.09 0.09 -0.03 Phos horns Ortho ,dissolved m /I 0.031 0.031 0.031 -0.005 Potassium, dissolved m /I 2.2 2.2 2.2 4.2 Selenium, total m /I O.Oa 0.04 O.Oa -0.002 Sodium Absor lion Ratio SAR talc. 2.89 2.89 2.89 27.6 Sodium, dissolved m /I 87.8 87.8 87.8 503 Sulfate m /I 70 70 70 180 TDS Ratio talc. TDS Calc. m /I TDS m /I 400 400 400 1350 TSS m /I 5 5 5 -5 Zinc, dissolved m /I 0.01 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 EIk Mine C-5 2002 Annual Hydrology Report HydroGeo, Inc.