Which of the following is NOT a characteristic of hazardous materials regulations?

The regulation of hazardous materials is designed to ensure that substances posing risks to health, safety, and the environment are managed properly. A key aspect of these regulations includes guidelines on proper handling, which encompasses safe storage, effective training for staff to recognize hazards, and the requirement for maintaining documentation that tracks the use and disposal of hazardous materials.

The characteristic that indicates "unlimited storage duration on site" does not align with hazardous materials regulations. Such regulations typically specify limits on how long hazardous materials can be stored in order to minimize environmental risks and ensure prompt disposal or treatment. Therefore, allowing unlimited storage is inconsistent with the overarching goal of protecting public health and the environment, making it the correct choice as not being a characteristic of hazardous materials regulations.

In summary, the essence of hazardous materials regulations is about ensuring safety and compliance, which is achieved through specific guidelines on handling, training, and documentation, rather than promoting indefinite storage of hazardous materials.