May be required to attain a valid unrestricted California Commercial Driver''s License, with any special certification needed (i.e., Special Construction Equipment Certificate, Radioactive Materials Certificate, Hazardous Materials/Waste Certificate, Tank Combination/Bulk Liquid Load Certificate), depending on the type of vehicle driven or load carried. Summary: Perform maintenance and repair of internal combustion engines, derricks, transmissions, brake systems, electrical systems, including 12 volt DC, 110 and 220 volt AC, ignition and fuel systems, hydraulic systems, steering and running gear.