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4 <br /> Table I. Dissolved Constituents in Some Natural Waters. <br /> (Units are in mg/1 unle ss 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 /> SiO2 0.29 6.7 48 <br /> Al 43 24 <br /> Fe 0.04 268 190 <br /> Mg 0.37 42 150 <br /> Ca 0.79 12 320 <br /> Mn 7.3 90 <br /> Cu 6.3 <br /> Zn 1.5 44 <br /> Cd 0.15 <br /> Pb 0.10 <br /> Na 2.0 25 22 <br /> K 0.25 2.9 3.4 <br /> As 0.20 <br /> HCO3 4.0 132 <br /> CL 3.43 30 <br /> S04? 1.39 56 2370 2270 <br /> pH 5.7 7.S 4.0 2.5 <br /> cond.a 421 3110 <br /> <br /> a <br />Cond. = <br />conductivity in umho/cm