When working in the field, must possess the strength, stamina, and mobility to perform medium to heavy physical work; to sit, stand, and walk on level, uneven, or slippery surfaces; frequently reach, twist, turn, kneel, bend, stoop, squat, crouch, grasp, and make repetitive hand movement in the performance of daily duties; to climb and descend ladders; to operate various equipment and tools; to operate a motor vehicle and visit various District sites; and vision to locate utilities and read printed materials. Under general supervision, performs a wide variety of skilled journey-level duties in maintenance, design, modification, construction, installation, and repair of electrical and instrumentation systems, machinery, motors, equipment, devices, plant control systems, and related facilities of District domestic and reclaimed water distribution systems, sewage collection systems, water treatment systems and Bio-solids and gas recovery systems.