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<br />R. G. OTTO & ASSOCIATES <br />concentrations, downstream levels will consistently be greater <br />than those at the upstream sampling point. Simple counts of the <br />e <br />frequeacp'of occurrence of maximum concentrations (within paired <br />samples), above and below the waste rock piles can b• used as <br />direct indications of th• presence or absence of impacts. <br />Boron levels below the waste rock pile (site 302) exceeded those <br />above (site 301) is only three of 14 comparisons (Tables 6>. The <br />reverse was tru• (higher observed concentrations upstream of th• <br />piles) oa five occasions. Ia the case of copper (Table: 7), <br />upstreaa concentrations were lower than those below the waste rock <br />piles on five occasions and greates oa five occasions. Foz lead <br />(Table 9), maximum concentration is a given sample pain was <br />upstream of the piles oa five occasions and downstream oa seven. <br />Radium-226 (Table 9) was present at highest concentrations <br />upstream of the piles on three occasions, below on four. There <br />was ao apparent seasonal pattern to any of these cross-•pile <br />differences. Thep are clearly as ezpressioa o! short-term natural <br />fluctuations is stream quality rather than waste rock ~>ile <br />impacts. <br />Measur:bl• levels of uranium were found at both locations on all <br />occasions (Table 10). The concentration was greater downstream of <br /> the waste rock piles (site 302) than above (site 301) r.'or 16 of <br />,,r, the 18 pair comparisons. The dillezences (concentration at site <br />37 <br />