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Well GP-4 <br />• <br />?J <br />• <br />Mountain Coal West Elk Mine <br />Monitoring Location Well GP-4 Baseline' 2007 Water Year <br />Description Units Minimum Maximum Mean 4/26/2007 5/24/2007 8/22/2007 <br />Field Parameters <br />Water Level Depth feet 31.80 Dry 31.9 <br />Electrical Conductivity µmhos/cm <br />pH SU <br />Temperature of <br />Comment too shallow too shallow <br />Laboratory Parameters 3 <br />Name of Certified Lab 2 <br />Lab Reference # <br />Sample Date <br />Lab Test Date <br />Sampled B <br />Alkalinity (Total CaCO3) mg/I <br />Aluminum, dissolved mg/I <br />Anions meq/1 <br />Arsenic, total mg/I <br />Bicarbonate mg/I <br />Boron, dissolved mg/I <br />Cadmium, dissolved mg/I <br />Calcium, dissolved mg/I <br />Carbonate mg/I <br />Cation - Anion Balance mg/I <br />Cations meq/1 <br />Chloride mg/I <br />Conductivity µmhos/cm <br />Copper, dissolved mg/I <br />Hardness mg/I <br />Hydroxide mg/l <br />Iron, dissolved mg/I <br />Iron, total mg/I <br />Lead, dissolved mg/I <br />Magnesium, dissolved mg/I <br />Manganese, dissolved mg/I <br />Manganese, total mg/I <br />Mercury, total mg/I <br />Molybdenum, dissolved mg/I <br />Nitrate/Nitrite (as N) mg/I <br />pH SU <br />Phosphate mg/I <br />Phosphorus (Ortho), dissolved mg/I <br />Potassium, dissolved mg/I <br />Selenium, total mg/I <br />Sodium Absorption Ratio (SAR) calc. <br />Sodium, dissolved mg/I <br />Sulfate mg/I <br />TDS Ratio calc. <br />TDS (Calc.) mg/l <br />TDS mg/I <br />TSS mg/I <br />Zinc, dissolved mg/l <br />Baseline andWY 2000 data adapted from WWE (2001). <br />2 ACZ Labs, Steamboat Springs, Colorado <br />' Negative values denote readings below lab detection levels <br />West Elk Mine <br />G-2 2007 Annual Hydrology Report HydroGeo, Inc.