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Mayo and Assoclafes, LC <br />• The isotopic compositions of groundwater from landslide, alluvial, and bedrock springs, and <br />water from the North Fork of the Gumrison River, which comprise the spring water cluster, <br />are statistically indistinguishable from each other (Table 4). The isotopic compositions of <br />these waters are indicative of modern recharge water in the vicinity of West Elk Mine. <br />Spring hydrograph data and the antluopogenic 'H and 14C contents, both of which are <br />discussed above, substantiate that these are modem waters. <br />Although the number of Barren Member well samples are limited, differences in the mean <br />isotopic compositions of Barren Member spring waters relative to Barren Member well <br />waters suggest that these two groups of groundwaters are no[ par[ of the same hydrodynamic <br />system. Barren Member well waters have'H and "C contents indicative of a mixture of <br />• mixed old and modern groundwater. <br />The heavy isotopic compositions of groundwaters obtained from wells in the B-, E, and F- <br />Seams mean that these groundwaters are not in hydrodynamic communication with <br />groundwaters in the Barren Member. <br />• <br />Characterization of Groundwater Systems in the Vicinity o(the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Paee 55 <br />