[' 1-hydroxypyrene ', ' 2,4,6-trichlorophenol ', ' 2,5-dichlorophenol ', ' arsenic ', ' beryllium ', ' cadmium ', ' chromium ', ' ethylbenzene ', ' hexachlorobenzene ', ' lead ', ' m-xylene ', ' manganese ', ' mercury ', ' nickel ', ' pentachlorophenol ', ' polychlorinated biphenyls ', ' vanadium ']