Final answer:
Hazardous waste generators must keep training records for at least three years from the last date the employee worked, in compliance with EPA regulations.
Step-by-step explanation:
Hazardous waste generators are required to keep training records for a specific duration per the Resource Conservation and Recovery Act (RCRA) to ensure hazardous waste is managed appropriately from creation to disposal. This act is part of a broad regulatory program established by the Environmental Protection Agency (EPA) to handle hazardous waste safely at all stages, including generation, transportation, treatment, storage, and disposal. While specific timelines may vary depending on detailed regulations and updates, comprehensive information on EPA's hazardous waste management program is available, but generally, hazardous waste generators must maintain these records for at least three years from the last date the employee worked.