manhole, sewer, construction, drain, industrial, pipe, concrete, collector, sewage, water, sewerage, industry, drainage, work, repair, pipes, underground, pipeline, urban, dirty, city, trench, outdoor, equipment, tube, road, street, ground, hole, hatch, plumbing, replacement, laying, tunnel, danger, rusty, engineering, maintenance, worker, pit, communications, installation, reconstruction, wastewater, development, city collector, cement, roadway, city services