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Well SOM-16-H <br />Water Quality and Field Parameters <br />C7 <br /> <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well SOM-16-H Baseline 2008 Water Year <br />tion <br />Descri Units Minimum Maximum Mean <br />p <br />Field Parameters <br />Water Level Depth feet <br />Electrical Conductivity pmhos/cm <br />pH SU <br />Temperature F <br />Comment Obstructed <br />Laboratory Parameters 3 <br />Name of Certified Lab <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaC03) mg/l <br />Aluminum, dissolved m /l <br />Ammonia m /I 1.1 17.8 12.3 <br />Anions me /l <br />Arsenic, dissolved m /l 0 0 0 <br />Arsenic, total m /l <br />Bicarbonate m /I 0 798 89 <br />Boron, dissolved m /I <br />Cadmium, dissolved m /I 0 0 0 <br />Calcium, dissolved m /l 120 120 120 <br />Carbonate m /l <br />Cation - Anion Balance % <br />Cations meq/1 <br />Chloride m /l 91 240 153 <br />Conductivity µmhos/cm 5970 6560 6265 <br />Copper, dissolved m /I <br />Hardness m /I 300 1140 720 <br />Hydroxide m /I <br />Iron, dissolved m /l 0 2.19 0.79 <br />Iron, total m /I 0.02 57.8 7.5 <br />Lead, dissolved m /I 0 0 0 <br />Magnesium, dissolved m /I 0 0 0 <br />Manganese, dissolved m /I 0 0.03 0.009 <br />Manganese, total m /I 0 1.05 0.11 <br />Mercu , dissolved m /I 0 0 0 <br />Molybdenum, dissolved m /l <br />Nitrate/Nitrite as N m /l 0 0.4 0.12 <br />Nitrogen, ammonia m q/1 <br />H SU <br />Phosphate m /l <br />Phos horus Ortho), dissolved m /l 0 0.07 0.009 <br />Potassium, dissolved m /l <br />Selenium, dissolved m q/1 0 0 0 <br />Selenium, total m /l <br />Sodium Absorption Ratio (SAR) calc. 6.27 24.1 12.79 <br />Sodium, dissolved m /l 582 582 582 <br />Sulfate m /l 23 42 32 <br />TDS Ratio calc. <br />TDS (Calc.) m /I <br />TDS m /I 34 2900 1890 <br />TSS m /I <br />Zinc, dissolved mg/11 0 0 0 <br />Baseline and WY 2000 data adap ted from WWE (2001). <br />West Elk Mine <br />G-15 2008 Annual Hydrology Report HydroGeo, Inc.