Related by context. Frequent words. (Click for all words.) 54 Intalco 54 Paducah Gaseous Diffusion Plant 53 smelter 53 smelting 52 potlines 52 Hawesville 52 zinc smelting 51 effluent discharge 50 plant 50 cement kiln 50 Kuan Yin Taiwan 50 Portsmouth Gaseous Diffusion Plant 50 copper smelting 50 APGI 49 SunCoke Energy 49 potline 49 Conemaugh River 49 Amcast 49 ash ponds 49 SunCoke 49 Minntac 49 tailings impoundment 49 alumina refining 49 wastewater discharge 49 Edge Moor 48 Alcoa 48 Point Tupper 48 Wolverine Tube 48 zinc smelter 48 smelters 48 aluminum smelting 48 gaseous diffusion plant 48 Piketon Ohio 48 coke ovens 47 PCBs polychlorinated biphenyls 47 ALCOA 47 electrowinning 47 bauxite mines 47 Yarwun 47 Chocolate Bayou 47 sinter plant 47 ktpa 46 Century Aluminum Co. 46 Claymont Steel 46 sulfur dioxide nitrogen oxide 46 contaminating groundwater 46 fly ash 46 settling ponds 46 contaminated soils 46 Hanford Site 46 polluted groundwater 46 tailings dams 46 Sud Chemie 46 sediment runoff 45 mill tailings 45 toxic pollutants 45 uranium tailings 45 Hydro Aluminium 45 wastewater effluent 45 TrentonWorks 45 ammonia nitrogen 45 hazardous waste 45 Becancour 45 wellfields 45 coke oven 45 install scrubbers 45 toxic pollutant 45 Fluor Hanford 45 Murrin Murrin 45 Shippingport 45 pelletizing 45 Radioactive waste 45 copper smelter 45 megawatt hydroelectric 44 aluminum smelter 44 evaporation ponds 44 REC Silicon 44 flyash 44 Piedras Verdes 44 toxic byproducts 44 Hibbing Taconite 44 containerboard packaging 44 Hatfield Ferry 44 Intermet 44 Superfund designation 44 electric arc furnaces 44 Koppers Holdings 44 phosphate mines 44 NYSE VMC 44 Boundary Dam 44 mtpy 44 Synfuel 44 Allegheny Ludlum 44 Occidental Chemical 44 furans 44 BioteQ Environmental Technologies 44 Generating Plant 44 wastewater sludge 44 El Cubo mine 44 Ronald J. Tenpas 44 Smelter