Ключевые слова: access, assembly, biological treatment, builder, cesspool, cleaning, communications, concrete rings, construction, cover, disposal, drainage, equipment, fecal, fix, ground, hatch, hole, hygiene, industry, installation, maintenance, male, men, outdoor, pave, pipeline, plumbing, pumping out, purification, repairman, reservoir, round, sanitary, sanitation, septic, septic tank, sewage, sewer, storage, structure, system, tank, toilet, trench, underground, waste system, water utility, work, worker,