Analyze rock and mud to detect the presence of oil.
Supervises and coordinates activities of workers engaged in repair and maintenance of sewers: Directs workers in connecting sewer lines to mains. Inspects construction of new sewers and manholes to ensure conformance with specifications, according to blueprints. Directs workers in cleaning storm, water, and sewer catch basins, repairing broken sewer lines, and replacing worn and damaged parts. May assist workers in repairing breaks in sewers. May operate and repair equipment, such as jackhammers, pumps, air compressors, and other equipment, used in repair and maintenance of sewers. May direct workers in operation of mobile closed-circuit television monitoring system to inspect internal areas of sewer lines.