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Spring Jd Water Quality and Field Parameters r, `-_~ • • Mountain Coal West Elk Mine Monitoring Location Spring Jd Baseline 2003 Water Year DeStfi lion Units Minimum Maximum Mean 4/17/2003 6/3/2003 9/18/2003 Field Parameters Flow m 2.22 2.76 0.06 Electrical ConductlVl umh05/cm 340 480 392 646 726 583 H SU 7.5 8.2 7.6 7.41 7.6 8 42 Tem erature OC 6.7 14.2 8 49.6 49.7 57.9 Comment Laborato Parameters Name of Certified Lab ACZ Lab Reference # La15o7-03 Sam le Date 6/5/2003 Lab Test Date 6/5-0117 Sam led B Alkalinit Total CaC03 m /I tog 262 795 233 Aluminum, dissolved m I 0.05 0.02 -0.03 Aluminum, total m /I 0.03 6.32 0.9 AnlOnS me ll 4.5 4.7 4.6 6.2 Arsenic, dissolved m /I o.oot o Arsenic, total m /I -0.0005 BicerbOnate m /I 169 282 195 233 Boron, dissolved m /I 0.02 Cadmium, dissolved m 71 -0.005 Calcium, total m 8 0.004 0.001 Calcium, dissolved m /I 34.2 54.4 43 59.3 Carbonate m /I -2 Cation -Anion Balance m /I 1.1 3.2 2.3 5.1 Cati0n3 me / 4.6 4.91 4.8 5.6 Chloride m /I 3 1.s a COnductivi Umh06/Cm 412 429 423 519 Ca er, dissolved m /I O.Ot 0 -0.ot Hardness m !I 725 191 156 183 H droxide m /I -2 Iron, dissolved m /I 0.06 0.02 -0.02 Iron, total m /I 0.03 6.75 0.82 0.03 Lead, dissolved m /I o.oooa Ma nesium,dissolved m /I s.s 13.a it.4 e.s Man anese, dissolved m /I -0.005 Man anese, total m 0.066 0.009 -0.005 Mercu ,total m /I -0.0002 Mol bdenum, dissolved m /I -0.ot Nitrate as N m /I 0.02 0.37 0.14 8.3 Nitrate/Nitrite as N m /I 0.05 0.37 0.13 6.3 Nitrite as N m /I 0.03 0.003 -0.01 H SU 7.1 8.1 7.5 8.1 Phos hate m fl Phos horns Ortho ,dissolved m /I 0.025 0.005 o.ot Potassium, dissolved m /I 1.3 1.3 1.3 1.3 Selenium, total m /I 0.002 0 Selenium, total recoverable m /I 0.o0t o -0.001 Sodium Absor lion Ratio SAR talc. t.0a 1.8 i.3 t.46 Sodium, dissolved m fi 29.6 51.5 36.7 45 Sulfate m /I 30 60 45 50 TDS Ratio talc. 0.95 TDS Calc. m /I 336 TDS m /I 230 300 254 320 TSS m A 28 6 -5 Zinc, dissolved m /I 0.01 0 0.04 Zinc, total m /I ACZ -ACZ Laborato 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 E-23 2003 Annual Hydrology Report NydroGeo, /nc.