Frequently required to walk, sit, talk, drive, hear, bend, stoop, twist, and balance; ability to kneel, crawl and grasp manual controls and to use foot controls and operate gas, diesel, and electrically powered equipment. Physical Demands: Essential functions involve significant demands related to repeated lifting of up to 50 pounds unassisted, 100 pounds with assistance rarely, carrying tools, materials, and equipment over rough terrain, climbing, reaching and bending.