Analyze rock and mud to detect the presence of oil.
Supervises and coordinates activities of workers engaged in construction, repair, and maintenance of swimming pools: Measures and marks pool excavation site, using transit and stakes. Directs workers in mixing, pouring, and leveling cement to form pool floor and in assembling prefabricated pool walls and lining. Cuts openings for plumbing into sides of pool and directs workers in installation of fixtures, such as pipes, spigots, valves, and pumps. Oversees installation of pool solar-heating system components. Inspects work in progress and completed pool installation to verify adherence to specifications. Trains new workers in work methods and assists workers in pool construction, maintenance, and repair. May secure contracts for pool installation and write customer orders. Performs other duties as described under SUPERVISOR Master Title.