Martin Marietta Materials - - Responsibilities: Start, monitor, and regulate crushers, screens, conveyors, feeders, and pumps in compliance with safety standards; Adjust process settings to ensure optimal material flow and quality in line with job specifications; Operate mobile equipment such as skid steers and front-end loaders during load out or clean-up tasks; Conduct pre-shift and ongoing inspections of plant and mobile equipment, document daily reports accurately; Perform preventative maintenance tasks like greasing, cleaning, screen changes, belt splicing, and bearing or pulley replacements