Related by context. Frequent words. (Click for all words.) 55 mine subsidence 49 subsidence 45 sinkholes 43 drainage pipes 42 longwall mining 41 roadbed 41 soil borings 41 sinkhole 41 cofferdam 41 landslips 41 Sinkholes 40 retaining wall 40 structurally unsafe 40 leaky pipe 40 cave ins 40 ponding 40 rockfalls 40 concrete piers 39 backfilling 39 revetment 39 deemed uninhabitable 39 seepage 39 flood plain 39 groundwater contamination 39 berm 39 landslip 38 drainage 38 concreted 38 stormwater drains 38 propane leak 38 digging trench 38 retaining walls 38 vapor intrusion 38 regrading 37 embankments 37 waterlines 37 sumps 37 drainage ditches 37 floodplain 36 slurry wall 36 silt 36 retention pond 36 sewer mains 36 rockfall 36 drainage basins 36 culvert 36 borings 36 railroad underpass 36 Devil Slide 36 backfilled 36 retention basins 36 excavation 36 coffer dam 36 drainage pipe 36 coal seam 35 manhole 35 noxious gases 35 streambed 35 manholes 35 infilling 35 ventilation shafts 35 Pawtuxet River 35 stormwater drainage 35 flood prone 35 dredge spoils 35 culverts 34 floodwater 34 water mains 34 sewer pipes 34 regraded 34 masonry walls 34 toxic vapors 34 flood proofing 34 diking 34 geotechnical 34 watercourse 34 sandbag dikes 34 backfill 34 Tangjiashan 34 pothole patching 34 dig trench 34 subsurface 34 waterline 34 floodwaters 34 swale 34 footings 34 stormwater drain 34 excavating 34 detention basins 34 groundwater 33 gravel 33 asbestos contamination 33 dredged material 33 hydrogeological 33 tract 33 subfloor 33 septic tank 33 geotechnical drilling 33 vacant 33 repaved 33 tailings dam