Related by context. Frequent words. (Click for all words.) 71 benzene toluene 64 xylene 63 BTEX 60 aromatic hydrocarbons 59 ethylbenzene 59 carbon disulfide 57 tremolite 57 organochlorines 57 carbon tetrachloride 57 elemental sulfur 57 inorganic compounds 57 Volatile organic compounds 56 phosphine 56 Hydrogen sulfide 56 dimethyl 56 ammonium chloride 56 fracturing fluids 56 polycyclic aromatic hydrocarbons 55 polycyclic aromatic hydrocarbons PAHs 55 endocrine disrupting 55 tetrachlorethylene 55 suspected carcinogen 55 Acetic Acid 55 fracking fluid 55 biogenic 55 Trichloroethylene 55 petroleum distillates 55 polybrominated diphenyl ethers 55 benzo pyrene 54 acrolein 54 chlorinated solvents 54 ethylene propylene 54 Xylene 54 Hydrochloric acid 54 naturally occurring mineral 54 fracking fluids 54 carcinogenic chemicals 54 LHF Seven Summits Strategic 54 methyl tertiary butyl ether 54 arsenic mercury 53 iron manganese 53 RHF Seven Summits Strategic 53 Hexavalent chromium 53 antimony trioxide 53 methylene chloride 53 Enterococcus 53 trichlorethylene TCE 53 chlordane 53 petroleum hydrocarbons 53 Toluene 53 toluene 52 bioaccumulation 52 naturally occurring radioactive 52 frac fluid 52 sulfur hexafluoride 52 acute toxicity 52 nitric 52 dieldrin 52 ethyl acetate 52 hexane 52 peroxides 52 potassium sulphate 52 corrosives 52 Sulfur dioxide 52 iron oxides 51 plasticisers 51 ITS CONTENTS 51 pentane 51 Nitrogen oxides 51 trichlorethylene 51 organochlorine pesticides 51 #ppm [002] 51 furans 51 polychlorinated biphenyls PCBs 51 perfluorooctanoic acid 51 THMs 51 Sulfuric acid 51 miscible 51 PCBs polychlorinated biphenyls 51 benzene 51 contaminate groundwater 51 potentially carcinogenic 51 Methyl 51 solvents 51 PAHs 51 perfluorochemicals 50 Ammonium 50 microbial contaminants 50 Proved + 50 mercury arsenic 50 contaminate drinking 50 pyrethrins 50 By NATALIA E. 50 methenolone 50 Glycol 50 methane CH4 50 triclocarban 50 terpenes 50 zinc cadmium 50 samarium 50 volatile organic compounds