Ability to exert heavy to extremely heavy, though not constant, physical effort, typically involving some combination of climbing and balancing, stooping, kneeling, crouching and crawling, and the lifting, carrying, pushing, and/or pulling of objects and materials weighing 21-50 pounds; may occasionally involve objects and materials up to and exceeding 100 pounds. Ability to operate a personal computer, utilizing word processing, spreadsheet, database management, mapping, incident reporting, and other software applications as may be necessary to perform essential job functions; ability to operate a mobile data computer.