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Spring 15.1 Water Quality and Field Parameters L~ Mountain Coal West Elk Mine Monitorin Location Sprin 15-1 Baselirro toot water Year Descri lion Units Minimum Maximum Mean 4/30/2001 6/24/2001 9/30/2001 Field Parameters Flow m 1.25 0,63 0.27 Electrical COnducliv Umhos/Cm 2060 1240 1137 1050 1080 1070 H SU 7.4 6.6 8.2 8 7.9 8.1 Tem eratUre oC 1.1 12.8 a 8.1 8.9 8.8 Comment Laborato Parameters Name of Certified Lab ~ aC2 Lab Reference # L32666-01 Sam le Date 6/24/2007 Lab Test Date sn7a/t 1 Sam led B R.H. Alkalinl Otal CaCO3 m 375 520 480 Aluminum, dissolved m Anions me 0.5 0.09 Arsenic, dissolved m Arsenic, total m 0.001 0.001 Bicarbonate - m I 36a 520 a77 Boron, dissolved m Cadmium, dissolved m 0.004 0.0005 Calcium, total ~ m ~ 0.004 O.o0o5 Calcium, dissolved m 44.9 67.8 56.3 Carbonate m 12 2.2 Cation -Anion Balance -5.8 3.6 •1 Cations me 12.1 14.4 13.3 Chloride m 4 - 8 6.3 Conductivi umhos/cm 1080 1120 1100 1090 Co er, dissolved m 0.01 o.Ot Hardness m I 222 307 271 H roxide m Iron, dissolved m 0.01 o.Ot -O.t Iron, total fn ~ 0.01 0.73 0.12 0.13 Lead, dissolved m Ma nesi0m, dissolved m 25.8 33.4 30 Man anese, dissolved m I Man anese, total m 0.022 0.001 Mercu ,total m Mo bdenum, dissolved m Nitrate as N m NitrateMitrite as N m 0.06 0.78 0.71 Nitrite as N m H SU 7.9 8.2 8.1 7.8 Phos hate m Phos horns Ortho ,dissolved m I 0.009 0.001 Potassium, dissolved m 2.8 3.2 3 Selenium, total m 0.002 0.001 Sodium Abso lion Ratio SAR talc. 4.61 5.39 4.99 Sodium, dissolved m 163 200 185 Sulfate m I 140 180 151 TDS Ratio talc. TDS Calc. m I TDS m 660 730 701 700 TSS m 2s s 6 Zinc, dissolved m 0.01 0.01 Zinc, total m I 0.05 0.02 AAL. Inc -American Assa Laboratories, I nc., S arks, Nevada ' Standard is for reference u oses onl NA - not a licable NM -not measured NR -not re orted West Elk Mine E-16 2001 Annual Hydrology Report HydroGeo, Ina.