Related by context. Frequent words. (Click for all words.) 45 mill tailings 45 ponds 45 contaminating groundwater 43 impoundments 43 silt fences 43 evaporation ponds 43 streambeds 42 tailings impoundment 42 retention basins 42 earthen dams 41 Conemaugh River 41 intermittent streams 41 sumps 41 tailing ponds 41 detention basins 41 frac fluid 40 Topsoil 40 silts 40 ash ponds 40 sediment 39 decomposed granite 39 frac sand 39 suspended solids 39 contaminate groundwater 39 aluminum sulfate 39 drainage basins 39 coarse sand 39 Sediment 39 headwater streams 38 retention ponds 38 dry casks 38 burnable 38 leach pads 38 uranium tailings 38 dewatered 38 dewater 38 disinfection byproducts 38 PCBs polychlorinated biphenyls 38 tailings 37 rip rap 37 silt 37 flyash 37 stormwater retention 37 arsenic cadmium 37 pollute groundwater 37 storage caverns 37 Columbia Generating Station 37 coal ash 37 gravel pits 37 cubic yards 37 Yucca Mountain Nev. 37 dissolved solids 37 roadbeds 37 freshwater mussels 37 dewatering 37 contaminated sediments 37 clarifiers 37 debris basins 37 tributary streams 37 Dunkard Creek 37 effluent discharge 36 dredged material 36 sediment samples 36 contaminated soils 36 valley fills 36 chlorinated solvents 36 diked 36 bottomland 36 caliche 36 Generating Plant 36 storage tanks 36 dredge spoils 36 waste MSW 36 lunar soil 36 radioactive contaminants 36 harmful contaminants 35 woody debris 35 pounds U#O# 35 riprap 35 sediments 35 dischargers 35 soil borings 35 freshwater wetlands 35 Widows Creek 35 cu ft gas 35 soil conditioner 35 contaminants 35 mercury arsenic 35 pumphouse 35 ruptured wellhead 35 stormwater runoff 35 fly ash 35 sanitary sewer overflows 35 borings 35 livestock manure 34 Kingston Fossil Plant 34 bio solids 34 Hobet 34 red sludge 34 situ uranium 34 excavated