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4 <br />• <br />Table I. Dissolved Constituents in Some Natural Waters. <br />(Units are in mg/1 unless stated) <br />Rain River Coal Metal <br />Water Water Mine Mine <br /> Drainage Drainage <br />Location Menlo Mississippi Avg. for Argo Tunnel <br />Park, @ Acid Colorado <br />Calif. New Orleans Drainage <br />Reference (16) (16) (1) (35) <br /> Si02 0.29 6.7 <br /> Al <br /> Fe 0.04 <br /> Mg 0.37 42 <br /> Ca 0.79 12 <br />i Mn <br /> Cu <br /> Zn <br /> Cd <br /> Pb <br /> Na 2.0 25 <br /> K 0.25 2.9 <br /> As <br /> HC03 4.0 132 <br /> CL 3.43 30 <br /> S04 1.39 56 <br /> pH 5.7 7.5 <br /> cond.a 421 <br /> <br /> a <br />Cond. = <br />conductivity <br />in umho/cm <br />43 <br />268 <br />7.3 <br />1.5 <br />2370 <br />4.0 <br />48 <br />24 <br />190 <br />150 <br />320 <br />90 <br />6.3 <br />44 <br />0.15 <br />0.10 <br />22 <br />3.4 <br />0.20 <br />2270 <br />2.5 <br />3110