Under the Comprehensive Environmental Response $,$ Compensation and Liability Act $($CERCLA$),$ the following is$/$are classified as Potentially Responsible Party Contractors who were in charge to clean$-$up a contaminated site producers, transporters and depositors of hazardous waste materials Technicians who were hired with the EHS functions at the sites Technicians who were assigned internship functions at the site a government department who had the EHS oversight functions of the site