"OSHA's [Occupational Safety and Health Administration] standards for general industry and the construction industry on hazardous waste operations and emergency response (29 CFR 1910.120 or 29 CFR 1926.65) cover all employees involved in: 1. Clean-up operations of hazardous substances at uncontrolled hazardous waste sites required by Federal, state, local or other governments; 2. Corrective actions involving clean-up procedures at sites covered by the Resource Conservation and Recovery Act (RCRA); 3. Voluntary clean-up operations at sites recognized as uncontrolled hazardous waste sites by Federal, state, local or other governments; 4. Operations involving hazardous waste that are conducted at treatment, storage and disposal facilities licensed under RCRA; 4. Emergency response operations for hazardous substance releases or substantial threats of releases. Exceptions are permitted if the employer can demonstrate that the operation does not involve employee exposure or a reasonable possibility of such exposure to hazards. State and local government employees are covered by equivalent standards in the 26 states with OSHA-approved state plans and by the Environment Protection Agency's hazardous waste standard in states without plans."
United States. Dept. of Labor. Occupational Safety and Health Administration: http://www.osha.gov/