Ключевые слова: activity, aging process, blue overall, caucasian ethnicity, construction industry, day, dirt, drinking water, earthwork, earthy, employee, engineer, engineering, environmental issues, equipment, examining, excavator, industry, large, leaking, main, metal, outdoors, pipe, pipe tube, pipeline, potable water, processing, pvc, repairing, reservoir, sand, screw, soil, steel, sunlight, sustainable resources, symbol, test, trench, tube, valve, warning sign, water company, water meter, water pipe, waterworks, wheel, worker, working,