Related by context. Frequent words. (Click for all words.) 43 Superfund sites 42 mine 42 mine tailings 42 Superfund cleanup 41 Superfund site 40 Shafter 40 Canyon 40 mines 40 toxics 40 mercury 39 polluted 39 pollutant 39 Asarco 39 contaminants 39 Mother Lode 39 Superfund 39 Kennecott 39 El Dorado Hills 39 Santa Susana 39 Hanford 39 Placer 39 contaminant 39 pollutants 39 toxic waste 38 Libby Mont 38 uranium mines 38 mercury contamination 38 Truckee Meadows 38 toxic chemicals 38 ASARCO 38 Sunol 38 Tonopah 38 contaminated soils 38 mining 37 Amador 37 toxic substances 37 Winnemucca 37 WIPP 37 Lake Tahoe Basin 37 toxic pollutants 37 chromium 37 hexavalent chromium 37 Suisun Bay 37 Calaveras 37 hazardous substances 37 Contaminants 36 groundwater contamination 36 Inyo County 36 BLM 36 Rocky Flats 36 tailings 36 hazardous waste 36 toxins 36 mined 36 Fort Ord 36 contaminated 36 Mount Diablo 36 hazardous chemicals 36 Clean Water Act 36 antimony 36 Antelope 36 coal mining 36 California condors 36 hazardous wastes 36 Yucca 36 ADEQ 36 roadless areas 35 Mono Lake 35 Portola 35 EPA 35 Kettleman City 35 Environmental Protection Agency 35 coal combustion 35 perchlorate 35 Butte 35 pollution 35 Berryessa 35 radioactive 35 manganese 35 El Dorado 35 Lake Tahoe 35 dumpsite 35 Tuolumne County 35 waste repository 35 Yerington 35 Hinkley 35 Sierra Nevada 35 Yucca Mountain 35 Tejon Ranch 35 toxic 35 contaminates 35 Toxic Substances Control 35 Reclamation 35 San Joaquin 35 pollute 35 Sonora 34 landfill 34 polluter 34 roadless 34 Sutter Creek 34 Envirocare