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and Assoclales, LC <br />• the number of locations included in the group. For example, the alluvial stream group <br />includes five alluvial streams that were sampled two to 36 times. <br />Mean values of solute compositions for each lithology and discharge type group (e.g. streams <br />on Qttatetnary sediments) is summarized in Table 3. In Table 3 the parameter n opposite <br />each sampling location and opposite the mean value for each group indicates the number of <br />individual monitoring locations. Other mean values for each group are weighted averages. <br />For example, in the Quatemary stream group there are 11 different sampling locations <br />representing five different lithologies. Because the alluvial system accounts for five of the <br />eleven sampling locations in the Quaternary stream group, the alluvial system is given a 5/11 <br />weigh[ in calculating the means of the group. <br />• There is great variability in the solute concentrations between the various surface and <br />groundwater groups and there is some variability in solute compositions. (Concentration <br />refers to laboratory measured contents, while composition refers to the pattern of <br />concentrations. For example, two different waters may have the same general composition in <br />that they are both of the Cat`-HCO; type, but they may have the two ions in significantly <br />different concentrations.) Overall solute concentrations of each group, excluding [he Oliver <br />Mine adit, the Upper Coal Member spring, and the two Rollins Sandstone wells (SOM 128-H <br />and So.W-3), are shown as TDS box plots (Figure 6). The Oliver Mine adit was not included <br />because there is uncertainty regarding the source of Ilse mine water. The Upper Coal <br />Member spring was excluded because it only represents a single site. The two Rollins <br />Sandstone wells were excluded because compositions of waters from [he two wells are so <br />• <br />Characterization of Groundwater Systems in the V icinity of the West Elk Mine, Somerset, Colorado <br />29 January 1999 <br />Page 33 <br />