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TABLE 2.7. WATER QUALITY STANDARDS <br /> (Chronic Aquatic Life, in ug/L) <br /> Hardness HARDNESS (in mg/L as CaCO3) <br /> METAL Independent 10 25 50 75 100 150 200 250 300 400 <br /> Aluminum 87 <br /> Antimony 14" • <br /> Arsenic 150 <br /> Barium 1000" <br /> Be Ilium 100' <br /> Cadmium 0.21 0.4 0.71 0.9 1.11 1.6 2.0 2.31 2.7 3.4 <br /> Chromium III 31 67 117 164 207 289 365 438 509 644 <br /> Chromium VI 11 <br /> Copper 2 4 7 9 12 17 21 26 30 39 <br /> Iron 1000— <br /> Lead 0.1 0.5 1 3 4 7 10 14 18 28 <br /> Manganese 418 688 1003 1250 1462 1822 2130 2405 2656 3105 <br /> Mercury 0.10 <br /> Nickel 17 33 56 77 96 130 162 192 220 274 <br /> Selenium 17 <br /> Silver 0.006 0.03 0.10 0.20 0.32 0.64 1.1 1.5 2.1 3.5 <br /> Thallium 15 <br /> Uranium 119 326 699 1092 1500 2345 3219 4117 5033 6910 • <br /> Zinc 15 33 59 83 106 149 190 230 268 342 <br /> No Chronic Aquatic Life Standard. Value given is for Agricultural Standard. <br /> No Chronic Aquatic Life Standard. Value given is for Drinking Water Standard. <br /> "' Value is for Total Recoverable Iron <br />