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Mayo and Assoelafes, LC <br />• fundamentally different from each other that they do not appear to represent the same <br />groundwater system. <br />The TDS box plots are constructed as a shaded box with an enclosed median line, two <br />whiskers and in some instances dots. The left and right whiskers represent the 10°i and 90'" <br />percentiles, respectively. The left and right ends of the boxes represent the 25'" and 75ih <br />percentiles, respectively. What this means is that 50% of the TDS values lie in the shaded <br />region of the box. The vertical line in the box represents the median TDS value and the dots <br />represent outliers which are less than ] 0'" percentile or greater than 90'" percentile. 1f the <br />median line is in the center of the box there is symmetry in the distribution of TDS values. If <br />the median line is closer to the left side of the box most of the TDS values in the middle 50 <br />• percentile are less than the median. The length of the box represents [he variability of TDS. <br />Shorter boxes indicate a small variability. <br />Mean solute compositions of each sampling location are illustrated as Stiff diagrams ou Plate <br />2. Major ion solute compositions of each major group have been plotted on Figure 7. Figure <br />7 consists of three separate graphs a, b and c; a includes streams, b includes alluvial and <br />landslide springs and wells, and c includes bedrock springs and wells and in-mine Rollins <br />Sandstone discharges. In Figure 7 the solute compositions are shown as reacting equivalents <br />(i.e. meq P') and TDIC (total dissolved inorganic carbon) is the sum of HCO; and CO;- <br />contents. Statistical differences in the means of each major group were evaluated by t-tests at <br />the 95% confidence interval (Table 4). <br />• <br />Characterization of Groundwatrr Systems in the Vicinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Pafle 37 <br />