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TABLE 2A. Suggested Criteria for Water Quality Conducive to Optimum <br />Health of Warmwater and Coldwater Species <br />(Source: Wedemeyer, 1974). <br />Water Chemistry Upper Limits for Continuous Exposure <br />Acidity pH 6-9 <br />Alkalinity <br />Ammonia <br />Cadmium <br />Chromium <br />Copper <br />Hydrogen Sulfide <br />Lead <br />Mercury <br />Nitrogen <br />Polychlorinated biphenyls <br />(PCB's) <br />Phthalate esters <br />minimum 20 ppm (as CaCO3) <br />0.02 ppm <br />0.0004 ppm in soft water (< 100 ppm) <br />0.003 ppm in hard water (> 100 ppm) <br />0.03 ppm <br />0.006 ppm in soft water <br />0.03 ppm in hard water <br />0.002 ppm <br />0.03 ppm <br />0.2 ppb maximum / 0.05 ppb average <br />110 maximum total gas pressure <br />0.002 ppm <br />0.3 ppb <br />Total suspended and 80 ppm or less <br />settleable solids <br />2-4 <br />