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TABLE Z.5-16b - (concluded) <br />TR-3 TR-4 <br />Parameter n z a z a <br />Cd mg/I 15 < 0.004 0.008 <0.004 0.008 <br />Cu mg/I 15 < 0.05 0.05 <0.05 0.03 <br />Dissolved Fe mg/I 12 <2.06 3.39 <1.32 2.58 <br />Mn mg/I 15 < 1.07 1.40 <0.53 0.92 <br />Mg mg/I 15 26.0 4.2 20.4 3.1 <br />Hg rng/I 15 < 0.001 0.0 <0.001 0.0 <br />Ag rng/I 15 < 0.07 0.14 <0.05 0.10 <br />V rng/I 15 < 0.5 0.5 <0.5 0.5 <br />Zn rng/I IS < 0.23 0.33 0.23 0.28 <br />Pb rng/I 15 < 0.07 0.13 <0.04 0.13 <br />As rng/I 15 < 0.005 0.003 <0.004 0.002 <br />Ba mg/I 15 < 0.3 0.3 <0.3 0.3 <br />Cr+6 mg/I I S < 0.07 0.03 <0.07 0.03 <br />• Ni rng/I 15 < .I I 0.10 <0.08 0.05 <br />Total Fe rng/I 15 52.2 66.8 19.88 23.98 <br />(I) n = nurnber of samples <br />z = arithrnetic mean <br />a = standard deviation <br />(2) One exceedingly high value, average excluding that volue in parenthesis. <br /> <br />Revised 7-81 2.5-72 <br />