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15 <br />1998 <br />Spoil Water Quality <br />Mean Annual Values <br />Constituent 008-SP-SA 008-SP-4B <br />Water elevation (M.S.L.) 6666 6672 <br />Calcium (mg/l) 401 448 <br />Sodium (mg/I) 177 66 <br />Magnesium (mg/1) 204 254 <br />Potassium (mg/I) N/A N/A <br />Sulfate (mg/I) 1750 183 <br />Bicarbonate (mg/I) 619 629 <br />Total Dissolved Solids (mg/1) 3095 3235 <br />Compazison of water sampling results from well 008-77-58 to spoil water quality data indicate a <br />distinct and recognizable movement of spoil water 500 feet down gradient to well 008-77-58. <br />Increased concentrations in the spoil water of calcium, magnesium, sulfate, and bicarbonate <br />cause slightly elevated levels of the same constituents in 008-77-58 over the baseline conditions. <br />A decreased spoil water concentration of sodium, likely due to cation exchange, appears to cause <br />a decrease in sodium concentration in the well water when compared to the baseline condition. <br />These observations indicate that minimal degradation of the water quality at well 008-77-~8 <br />represents the probable worst case impact to the local regime from degraded spoil water. <br />Although changes in the quality of the water in the monitoring well aze apparent, due to dilution <br />and dispersion, water quality down gradient is not impacted to the degree that any current or <br />future uses will be impaired. Given the large degree of change of water quality at a distance of <br />X00 feet, locations further downgradient would likely receive lesser levels of degradation due to <br />attenuation and dispersion. <br />Colorado Yampa Coal Company Minc No. 3. SLO'_ Findings 6/99 a:\COSa06?\SLO?(nd.doc <br />