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<br /> <br />R. G. OTTO & ASSOCIATES <br />~~ <br />Sulfate concentration was surprisingly consistent on a seasonal <br />basis (given the observed differences in conductivity) and was <br />actually greater at the upstream location (*301) on three of the <br />five sampling occasions. All cross-pile differences i~1 sulfate <br />levels were within the range of expected variation based on <br />calculated deviations from mean values. <br />Boron, copper, lead and radium-226 were present in measurable <br />quantities for a sufficient number of occasions to all~~w some <br />evaluation of waste rock pile impacts. The observed <br />concentrations above and below the waste rock piles ha•re been <br />tabulated individually (Tables 6, 7, 8, 9). In each case, a <br />f~~ <br />substantial number of the measurements yielded concentrations <br />below the analytical detection limits. This cominglia~7 of <br />specific and indeterminate values precludes statistica:L analysis <br />or calculations of means and variances that have nay real <br />application to the goals of this study. However, an enopirical <br />scan of the measurements provides a reasonably confident <br />demonstration that waste rock pile runoff or seepage are not <br />influencing stream concentrations for these parameters.. <br />Perhaps the best indication of the presence or absence of waste <br />rock pile impacts on these parameters is the spatial di.stzibutioa <br />of maximum values within paired samples. The premise i.s that, if <br />waste rock pile runoff or seepage is influencing stream <br />~~.y <br />