Related by context. Frequent words. (Click for all words.) 70 PCBs polychlorinated biphenyls 69 polychlorinated biphenyls PCBs 66 carbon tetrachloride 65 chlorinated solvents 63 trichlorethylene TCE 62 suspected carcinogen 61 harmful contaminants 61 wastewater effluent 61 chlordane 61 contaminants 60 mercury arsenic 60 benzo pyrene 60 PCBs 60 disinfection byproducts 60 methylene chloride 59 THMs 59 arsenic mercury 59 benzene toluene 59 furans 59 tetrachlorethylene 59 carcinogenic chemicals 58 Hydrogen sulfide 58 toxic chemicals 57 reproductive toxicity 57 bioaccumulation 57 vinyl chloride 57 dieldrin 57 toxic pollutant 57 iron manganese 57 contaminant 57 contaminating groundwater 56 polychlorinated biphenyls 56 ammonia nitrogen 56 Phenol 56 Contaminants 56 solvents 56 DBPs 56 toxic solvents 56 Kuan Yin Taiwan 56 Diesel exhaust 56 arsenic 55 methyl mercury 55 Residues 55 furan 55 polybrominated diphenyl ethers 55 sludges 55 ethylbenzene 55 total dissolved solids 55 potentially carcinogenic 55 Hydrochloric acid 54 Toxic chemicals 54 mercury cadmium 54 corrosives 54 hydrogen chloride 54 chromium 54 toxic substances 54 endotoxins 54 hydrofluoric acid 53 endocrine disruptor 53 toxicants 53 chemical vapors 53 trichlorethylene 53 organic solvents 53 contaminated sediments 53 ethyl acetate 53 compound VOC 53 phosphine 53 pollutants 53 PBDE 53 flame retardant chemicals 53 polluted groundwater 53 potassium permanganate 53 sewage effluent 53 perchlorethylene 53 acrolein 53 elemental sulfur 53 pollutant 53 mold fungi 52 lead mercury cadmium 52 mercury vapors 52 toxins 52 toxic pollutants 52 stormwater discharge 52 nitrification 52 potent neurotoxin 52 contaminated soil 52 petroleum hydrocarbons 52 toxic vapors 52 arsenic cadmium 52 Ammonium 52 Bacillus cereus 52 halogenated 52 suspended solids 52 fracturing fluids 52 chloride 52 barium 52 toxicant 52 PCB contamination 52 hazardous chemicals 52 polycyclic aromatic hydrocarbons PAHs 52 cadmium mercury