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<br />R. G. OTTO & ASSOCIATES <br /> <br />Table 4. Frequency of occurrence of selected trace metals at <br />concentrations less than the analytical detection <br />limit. Values indicate the number of sampling series <br />in which the particular element was below the detection <br />limit in >60% of the replicates at the location. <br />Element Detection Freguencv l1) <br />Limit 1)301 M302 <br />u m 1 <br />Arsenic 1 5/5 5/5 <br />Barium 100 3/5 4/5 <br />Boron 10 2/5 1/5 <br />Cadmium 1 5/5 4/5 <br />Copper 1 2/5 2/5 <br />Lead 1 0/5 1/5 <br />Mercury 0.1 5/5 5/5 <br />Selenium 1 5/5 5/5 <br />Silver 0.03 3/3 (2) 5/5 <br />~~44t~r <br />~:3~ <br />(1) Location 301 upstream, 302 downstream of the waste rock <br />piles. <br />(2) Only three series of samples taken at Site 301 for <br />determination of silver concentzatioas. <br /> <br />~,n <br />