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Well SOM-45-H-2 <br />Water Quality and Field Parameters <br />• <br />• <br /> <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-45-H-2 Baseline' 2008 Water Year <br /> <br /> <br />Description <br /> <br />Units <br /> <br />Minimum <br /> <br />Maximum <br /> <br />Mean <br /> <br />5/10/2008 <br /> <br />6/7/2008 <br /> <br />8/20/2008 Enviro- <br />Chem <br />MDL <br />Field Parameters <br />Water Level Depth feet 185.0 181.9 180.0 <br />Electrical Conductivity mhos/cm 1073 1626 1285 1246 1334 1290 <br />H SU 6.4 8.6 7.7 7.88 8.05 8.06 <br />Temperature o° °C 9.9 10.7 11.4 <br />Comment <br />Laboratory Parameters 3 <br />Name of Certified Lab z Enviro-Chem <br />Lab Reference # 08/1504 <br />Sample Date 8120/2006 <br />Lab Test Date 8/22-8/28 <br />Sampled B P. Holder <br />Alkalinity (Total CaC03) mg/I 286 955 635 <br />Aluminum, dissolved m /I <br />Ammonia m /I 0.03 2.35 0.69 <br />Anions me /I 15 15.5 15.3 <br />Arsenic, dissolved m /I 0 0.002 0.001 <br />Arsenic, total m /I <br />Bicarbonate m /I 0 1156 455 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I 0 0 0 <br />Calcium, dissolved m /I 4 6.9 5.6 <br />Carbonate m /I 0 218 17 <br />Cation -Anion Balance % -5.4 3.8 -0.2 <br />Cations me /I 13.9 16.4 15.3 <br />Chloride m /l 2 10 8 <br />Conductivity mhos/cm 1310 1390 1350 1176.8 1 <br />Copper, dissolved m /I <br />Hardness m /I 15 882 215 <br />Hydroxide m /I 0 0 0 <br />Iron, dissolved m /I 0 0.86 0.25 0.118 0.01 <br />Iron, total m /I 0.35 6.15 1.96 0.652 0.01 <br />Lead, dissolved m /I 0 0 0 <br />Magnesium, dissolved m /I 1.3 5 2.1 <br />Manganese, dissolved m /I 0.034 0.064 0.048 <br />Manganese, total m /I 0.014 0.39 0.131 <br />Mercury. dissolved m /I 0 0 0 <br />Molybdenum, dissolved m /I <br />Nitrate/Nitrite as N m /I 0 0.04 0.01 <br />Nitrogen, ammonia m /I 0.1 1.04 0.61 <br />H lab SU 7 8.2 7.6 7.71 0.001 <br />Phosphate m /I 0.39 0.42 0.41 <br />Phosphorus Ortho , dissolved m /I 0 0.535 0.074 <br />Potassium, dissolved m /I 2 2.5 2.3 <br />Selenium, dissolved m /I 0 0 0 <br />Selenium, total m /I <br />Sodium Absorption Ratio SAR calc. 14.9 37.9 32 <br />Sodium, dissolved m /I 308 385 352 <br />Sulfate m /I 20 526 161 <br />TDS Ratio talc. <br />TDS Calc. m /I <br />TDS m /I 777 2 <br />TSS m /I 25 2 <br />Zinc, dissolved mg/I o 0.02 0.01 <br />' Baseline and WY 2000 data adapted from WWE (2001). <br />2 Enviro-Chem Analytical, Grand Junction, CO <br />13 Zero values denote readings below lab detection levels (MDL). <br />G-12 <br />West Elk Mine <br />2008 Annual Hydrology Report <br />HydroGeo, Inc.