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Oil & <br /> Grease Median concentrations ranged from 0.6 to 4.3 <br /> mg /L (a sheen is usually visible at 2 mg/L and <br /> industrial discharge limits are 10 mg /L). <br /> Oil & Grease is perceived to be a problem by the <br /> public. <br /> Oil & Grease may be a significant source of <br /> PAHs, and PAHs were detected at levels which <br /> significantly exceed human consumption criteria. <br /> Bacteria Criteria were exceeded at all stations during each <br /> monitored storm event. <br /> Pesticides/ <br /> Herbicides Less than one percent detection, however, <br /> detection limits may not be low enough. <br /> Pesticides have been found in sediments collected <br /> from the Amazon Creek. <br />