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Middle Sylvester Gulch Surtace Water Quality and Field Parametere r ~.J `r~ u Mountain Coal West Elk Mine Monhorin Location M. S Nester Gulch Baseline 2001 Water Year Descd lion Units Minimum Maximum Mean 4/28/2001 6/24/2001 9/30/2001 Field Paremetere Flow cis Electrical Conductiv' umhos/cm 1380 3900 1770 H SU 8.7 6.9 9 Tem erature oC i1S 23.2 13.8 Comment O.G.z-0.13 O.G: 1.10 O.G.~.01 Laboreto Parameters Name of Certified Lab - ACZ Lab Reference # L32668-05 Sam le Date 6l2aJ2001 Lab Test Date 6/27-7/11 Sam led B R.H. Alkalini otal CaCO3 m Aluminum, dissolved m Anions me Arsenic, dissolved m Arsenk, total m Bicarbonate m 448 310 Boron, dissolved m Cadmium, dissolved m Calcium, dissolved m Carbonate m Cation -Anion Balance m Cations m Chloride m 3 10 5 Conductivi umhos/cm 480 800 606 3810 Co er, dissolved m Hardness m 159 23a 1sa H roxide m Iron, dissolved m 0.4 0.1 0.17 Iron, total m 0.05 10.5 2 4.00 Lead, dissolved m Ma nesium, dissolved m I Man anew, dissolved m Man anew, total m 0.56 0.05 Mercu ,total m enum, dissolved m Nitrate as N ,dissolved m Nflrate/NiMte as N m 0.08 0.02 Nitrhe as N dissolved m H SU 7.35 6.70 8.08 6.9 Phos hate m I Phos horns Ortho dissolved m 0.875 0.1t Potassium, dissolved m Selenium, total m Sodium Abso lion Ratio SAR Calc. 2.29 3.02 2.7 Sodium, dissolved m Sulfate ~ m 28.2 80 46.1 TDS Ratio talc. TDS Calc. TDS TSS m m m I 3.68 4.2 584 57x0 381 419 2520 15B Zinc, dissolved m ACZ Labs, Steamboat S rin s, Colorado ' Standard is for reference u oses onl NA - not a licable NM -not measured NR -not re orted West Elk Mine C-4 2001 Annual Hydrology Report HydroGeo, Inc.