Related by context. Frequent words. (Click for all words.) 75 contaminated sediment 63 sediment 63 contaminated soil 58 contaminated groundwater 58 PCBs 58 silt 57 contaminants 55 sediments 54 polychlorinated biphenyls 53 mine tailings 53 Sediment 53 waterways 53 tailings 52 pollutants 51 dredging 51 Superfund site 51 toxic pollutants 50 milfoil 50 toxic chemicals 50 toxics 50 stormwater 50 polluted 50 groundwater contamination 49 dredge 49 groundwater 49 dredged 49 retention ponds 49 Superfund 49 sewage overflows 49 suspended solids 49 Superfund sites 49 dewatering 49 leachate 48 wetlands 48 watersheds 48 Clean Water Act 48 shoreline 47 coal tar 47 contaminated 47 Chicago Sanitary 47 mercury contamination 47 stormwater runoff 47 cubic yards 47 storm drains 47 hazardous substances 46 riprap 46 wastewater 46 cleanup 46 toxic substances 46 sedimentation 46 toxic waste 46 zebra mussels 46 Asian carp 46 shorelines 45 ballast water 45 estuaries 45 contaminant 45 remediation 45 Remediation 45 coal ash 45 TMDL 45 sludge 45 arsenic 45 invasive species 45 lakes 45 toxic 45 Asian Carp 45 toxins 45 Watershed 45 catch basins 45 raw sewage 45 Dredging 44 brownfields 44 DEQ 44 Environmental Quality 44 hazardous waste 44 estuary 44 sewer overflow 44 watercourse 44 landfill 44 leaching 44 storm sewers 44 outfall 44 trichlorethylene 44 headwaters 43 hazardous chemicals 43 invasive weeds 43 wetland 43 effluent 43 waterway 43 Environmental Protection Agency 43 lagoons 43 ponds 43 sewage 43 mercury emissions 43 tributaries 43 marsh 43 contamination 43 shellfish beds 43 dioxin 43 toxic algae