Ключевые слова: background, backhoe, backhoe digs, build, business, civil engineering, commercial, concrete, concrete drain, concrete pipe, construction, construction site, development, dig, digs ground, ditch, drain, drainage, drained water, earth work, excavator working, external sewage, ground, industrial, industry, installation, laying pipe, manhole, materials, municipal, pipe, pipeline, piping, plumbing, preparation, road, round, row, sanitary sewer, sewage, sewage pipes, sewer, sewerage, sewerage systems, site, trench, underground, underground installation, water, work,