Related by context. Frequent words. (Click for all words.) 66 iron manganese 65 arsenic mercury 64 trichloroethene 63 mercury arsenic 63 niobium oxides vanadium 61 Hexavalent chromium 61 zinc cadmium 60 soft whitish 60 PCBs polychlorinated biphenyls 58 copper nickel cobalt 57 tetrachlorethylene 57 suspected carcinogen 57 arsenic antimony 57 pentachlorophenol 57 powerful explosive PETN 57 polychlorinated biphenyl 57 arsenic cadmium 57 tremolite 57 Trihalomethanes 57 magnesium potassium 56 cesium formate drilling 56 diarrhea cramps nausea 56 iron sulfate 55 polychlorinated biphenyls PCBs 55 Elevated levels 55 haloacetic acids 55 Hydrogen sulfide 55 benzo pyrene 55 Contaminant 55 Contaminants 55 carbon disulfide 55 arsenic 55 ammonia nitrogen 55 contaminating groundwater 55 mercury cadmium 55 Nitrogen oxide 55 perfluorochemicals 55 PGEs 54 organochlorines 54 DBPs 54 trichlorethylene TCE 54 Contaminated soil 54 mercury sulfur dioxide 54 mercury PCBs 54 contaminate groundwater 54 naturally occurring mineral 54 alunite 54 amphibole 54 VMS Belt 54 carbon tetrachloride 54 Sediments 54 ppm molybdenum 54 chlordane 54 EPA Proposes 54 naturally occurring arsenic 54 zinc Zn 53 THMs 53 chlorinated solvents 53 g t Pt 53 oz Au t 53 perfluorooctanoic acid PFOA 53 superalloy producers 53 potassium magnesium 53 methane ethane 53 specialty waxes 53 unlined pits 53 iron sulfide 53 Chlorinated 53 magnesium calcium 53 scheelite 53 disinfection byproducts 53 fecal coliforms 53 Leachate 53 epidote 53 magnesium hydroxide 53 By HARVEY SIMPSON 53 crystalline silica 53 leachable 52 hexavalent chromium 52 trichlorethylene 52 cadmium mercury 52 dissolved solids 52 g t PGM 52 Volatile organic compounds 52 contaminants 52 contaminated sediments 52 polluted groundwater 52 By MOISEKAPENDA BOWER 52 Edge Moor 52 pathfinder elements 52 sulfur trioxide 52 groundwater plume 52 Rare Earth Element REE 52 Trichloroethylene 52 slushy crystalline form 52 copper sulphides 52 niobium tantalum 52 hydraulic fracturing fluids 52 chromium 52 endocrine disrupting 51 sodium dichromate