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East Gulch, East of Norse Gulch Surtace Water Quality and Fisld Parameters C-14 Mountain Coal West Elk Mine Monitoring Location E. Gulch, E. of Horse Gulch Baseline 2005 Water Year Descri lion Units Minimum Maximum Mean 5/1/2005 fi/5/2005 10/2/2005 Field Parameters Flow m 45 0,68 wet Electrical Conductivi umhos/cm 260 480 402 405 505 H SU 7.7 8.4 8.0 7.3 8,48 Tem erature (°C °C 4.8 ta.e 10 Tem erature °F °F a6.z 69.5 Comment Laborato Parameters' Name of CertiOed Lab ACZ Lab Reference # L51525-03 Sam le Date 6/5/2005 lab Test Date s/enoos Sam led B Alkalini Total CaC03 m /I i35 245 202 Aluminum, dissolved m /l 0.03 0.03 0.03 Anions me /I 4.9 4.9 4.9 Arsenic, dissolved m /I Arsenic, total ~ m A BiCafbOnate m / 135 245 202 Boron, dissolved m /I Cadmium, dissolved m R Calcium, dissolved m /I z6.a 53.6 az.fi Carbonate m /I 6 o.s Cation -Anion Balance °~ Cations me /I 4.9 4.9 4.9 Chloride m /I 1 4 2 COnductivi Umhos/Cm 453 453 453 443 Co er, dissolved m A Hardness m /I 95 790 156 H droxide m /I Iron, dissolved m /I 0.05 0.05 0.05 0.07 Iron, total m /1 0.41 3.59 7.07 0.88 Lead, dissolved m !1 Lead, total m /I Ma nesium, dissolved m fl 8.9 13.7 11.0 Man anese, dissolved m A 0.012 0.012 0.012 Man anese, total m /I 0.01 0.094 0.068 Merw ,total m 11 Mol bdenum, dissolved m /I Nitrate as N ,dissolved m /I Nitrate/Nitrtte as N m 11 0.04 0.23 0.13 Nitrite as N ,dissolved m A H lab SU 8 8 8 8.8 Phos hale m /l 0.2 0.2 0.2 Phos horns Ortho ,dissolved m /l o.os6 9.ot8 Potassium, dissolved m 11 t.e t.8 1.8 Selenium, dissolved m /l Selenium, total m /I Sodium Absor lion Ratio SAR talc. 0.94 1.65 1.5 Sodium, dissolved m /I 20.9 47.8 40.2 Sulfate m /l TDS Ratio talc. TDS Calc. m /I TDS m /1 170 290 252 280 TSS m /l sa n 1s Zinc, dissolved mgfl 'Baseline, WY 2000, and WY 2001 data ads fed from W WE. ACZ -ACZ Laboratories, Inc., Steamboat 5 rin s, CO Ne alive values denote readin s below lab detection levels NM -Not Measured West Elk Mine 2005 Annual Hydrology Report HydroGeo, Inc.