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Mayo and Assoelales, LC <br />the well screen is Duly 50 fee[ below ground surface, the well hydrograph, described below, <br />shows both seasonal and climatic variability, and the water in the well contains <br />anthropogenic "C. <br />The B-, E-, and F-Seam cluster, which generally plots below the MWL, has the most <br />negative plotting location. Mean S'H and 5180 compositions of this cluster are -16.78 and - <br />128.0%0, respectively. The Barren Member well and in-mine Rollins Sandstone cluster plots <br />intermediate between the previously described clusters. The mean S'-H and 5180 <br />compositions of the in-mine Rollins Sandstone waters are -16.2 and -120.9%0, respectively. <br />The mean SZH and 5160 compositions of the Barren Member wells are -16.1 and -121.4%0, <br />respectively. <br />• <br />Statistical differences in the means of the clusters were evaluated using t-tests (Table 4), <br />which demonstrates that the three clusters are statistically distinguishable from each other. <br />Test results are listed for the 95% confidence interval. <br />4.4.2 Discussion <br />Because the stable isotopic compositions of surface and groundwaters were set at the time of <br />precipitation, as described above, each plotting cluster likely represents recharge occumng <br />under different paleoclimatic conditions. The stable isotopic compositions also suggest that <br />the groundwater systems are compartmentalized and that there is not active hydraulic <br />communication between near surface groundwaters, which discharge as springs, and <br />. groundwaters found at depth. <br />Characterization of Groundwater Systems in the Vicinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Page 54 <br />