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East Gulch, East of Horse Gulch Surface Water Quallly and Field Parameters • Mountain Coal West Elk Mine Monitorin Location E. Gulch, E. of Horse Guleh Baseline 2005 Water Year DeeCrl IIOn Unite Minimum Maximum Mean 5/1/2005 6/5/2005 10/2/2005 Field Parameters Flow m 45 0.68 wet Electrical Condudivi umh05/Cm 260 480 402 405 505 H SU 7.7 8.4 8.0 7.3 848 Temperature (°C °C 4.8 14.8 10 Tem eraturs °F) °F 4H.Z 69.5 Comment Laborsto Parameters" Name of Certified Lab ACZ Lab Reference # L51525-03 Sam le Date 6/5/2005 Lab Test Dafe s/anoo5 Sam lad B Alkalini Total CaC03 m /I t35 2a5 zo2 Aluminum, dieeolved m /I 0.03 0.03 0.03 Anions me /I 4.9 4.9 4.9 Arsenic, dissolved m /I Arsenic, total m /l Bicarbonate m /l 135 245 202 Boron, dissolved m /l Cadmium, dissolved m !I Calcium, dissolved m /l zs.e 53.s 4z.6 Carbonate m /1 s 0.5 Cation -Anion Balance °h Cations me /I a.9 a.9 4.s Chloride m /I 1 4 2 COOduClivi umho3/Cm 453 453 453 443 Co er, dissolved m /l Hardness m A s5 190 156 H droxide m /l Iron, dieeolved m /I 0.05 0.05 0.05 0.07 Iron, tOlal m ll 0.41 3.59 1.07 0.88 Lead, dissolved m /I Lead, total m A Ma nesium, dissolved m M 6s ts.7 tts Man anese, dissolved m /l 0.012 0.012 0.012 Man anese, total m /l 0.01 0.094 0.068 Mercu ,total m 11 Mol bdenum, dissolved m /I Nitrate as N ,dissolved m A Nitrate/Nitrite as N m 11 o.oa 0.23 o.t3 Nitrite as N ,dissolved m /l H lab SU e 6 a e.a Phos hate m I 0.2 0.2 0.2 Phos horns Ortho ,dissolved m A o.ofis o.ota Potassium, dissolved m /I t.b t.8 7.9 Selenium, dissolved m 11 Selenium, total m !I Sodium Abso lion Ratio SAR talc. 0.94 1 e5 1.5 Sodium, dissolved m !I 20.s a7.a 40.2 Sulfate m ~ TDS Ratio talc. TDS Calc. m ll TDS m ll t70 290 252 280 TSS m /l so 17 is Zinc, dissolved mg/l 'Baseline, WY 2000, and WY 2001 data ada fed from W WE. ACZ -AC2 Laboratories, Inc., Steamboat S do s, CO N alive values denote readin s below lab detection levels NM -Not Measured West Elk Mine C-74 2005 Annual Hydrology Report HydroGeo, Inc.