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. Comparison of specific conductivity shows that little difference occurred in the data sets as a <br />result of different sampling regimes. In fact, the mean values all fall within the 9~% <br />confidence intervals of the comparable study. Other water quality constituent levels remained <br />similar to those collected in the earlier periods. <br />As a further part of the EMRIA Program, Parker and Turk (1981) of the USGS used data <br />collected from Taylor Creek and Wilson Creek in a publication dealing with several <br />watersheds in the larger Yampa River Basin. This publication is included in its entirety in <br />Exhibit 7A and is briefly summarized here. They analyzed major and trace constituents in six <br />streams in the Yampa River drainage. The data revealed that overall stream chemistry was <br />characterized by saturation of common carbonate minerals such as calcium, magnesium, iron, <br />manganese and lead. They also determined that the solubility of the carbonate materials was <br />a major control on the absolute and relative concentrations of calcium, magnesium, iron, <br />manganese and lead. <br />The mean concentrations in the semi-arid watersheds of Taylor Creek and Wilson Creek <br />were significantly higher than those from the more humid watersheds in the Upper Yampa <br />River Basin. Trace metals, however, were not significantly different as a function of climate <br />or other variables. The study also produced linear regression estimators useful in predicting <br />total dissolved solids and other major ion concentrations as a function of specific <br />conductivity, which is more easily measured. <br />Results of the linear regressions and statistical comparisons of the mean values showed that <br />. Taylor Creek and Wilson Creek were different for the major concentrations. Goodspring <br />Creek was not included in the analysis because of its alluvial\colluvial valley floor <br />characteristics. These differences, however, are not inhibitory to the overall regression <br />process and substantiate the conclusion of highly variable water quality within the Colowyo <br />Mine area. <br />The regressions are further valuable for future predictions of the major ions in each basin as a <br />function of possible mine disturbances. Specific conductivity measurements can be taken in <br /> <br />2.04.7-72 <br />