Related by context. Frequent words. (Click for all words.) 60 Spelter 55 arsenic cadmium 50 zinc smelter 48 Superfund site 48 WR Grace 48 polluted groundwater 48 mercury arsenic 46 groundwater contamination 45 suspected carcinogen 45 asbestos contamination 45 sulfur dioxide nitrogen oxides 45 Buyat Bay 45 DuPont 44 toxic waste 44 red sludge 44 environmental 44 Superfund cleanup 44 butter flavoring 44 coal slurry 44 contaminated groundwater 43 SunCoke 43 trichlorethylene 43 arsenic mercury 43 toxic chemicals 43 vermiculite mine 43 LTV Steel 43 Sulfur dioxide 43 Dow Chemical Co 43 contaminating 43 contaminate groundwater 42 asbestos 42 PIKEVILLE Ky. 42 mercury contamination 42 Environmental Protection Agency 42 Libby Mont 42 toxic pollutants 42 Superfund Site 42 mine tailings 42 pollute groundwater 42 noxious odors 42 Atlantic Richfield 42 Rocky Flats 41 Appalachian Voices 41 Dow Chemical Co. 41 coal ash 41 Massey Energy 41 radioactive tritium 41 Patriot Coal 41 polluted 41 wastewater discharge 41 hazardous waste landfill 41 polychlorinated biphenyls PCBs 41 improperly disposing 41 PCB contamination 41 Newmont Mining Corp. 41 EI DuPont de Nemours 40 sulfur dioxide 40 toxic vapors 40 EI Du Pont 40 Jeff Gillenwater 40 carcinogenic chemicals 40 toxic wastes 40 coal mine 40 smelter 40 Allegheny Ludlum 40 vinyl chloride 40 pollution 40 toxic substances 40 copper smelting 40 Disposal Facility 40 contaminate drinking 40 tetrachlorethylene 40 acid rain 40 Zijin Mining Group 40 contaminated soils 40 unnamed tributary 40 Toxic chemicals 39 Superfund sites 39 Tony Oppegard 39 coke ovens 39 contaminated soil 39 sediment runoff 39 Dow Chemical 39 C8 39 Horsehead 39 DuPont DD 39 ecological catastrophe 39 Asarco 39 EPA Superfund 39 beryllium 39 chemical 39 PFOA 39 hazardous waste 39 NYSE CNX 39 Sherwin Williams Co. 39 valley fills 39 Chemical Waste Management 39 toxic byproducts 39 MeadWestvaco Corp. 39 longwall mining 39 Westlake Chemical