Under which circumstance must all carriers involved in transportation sign the Hazardous Waste Manifest?

The requirement for all carriers involved in the transportation of hazardous waste to sign the Hazardous Waste Manifest is mandated when hazardous waste is being transported. The Hazardous Waste Manifest is a crucial document that ensures the proper tracking and management of hazardous waste from its point of origin to its final destination. This document provides essential information about the waste being transported, including its nature, quantity, and the parties involved in the transportation process.

Having all carriers sign the manifest is vital for accountability and compliance with environmental regulations. It serves as a legal record that the carriers acknowledge and accept the responsibility for the waste during transit, ensuring that they are aware of the hazardous nature of the materials they are handling. This accountability is important for safety, environmental protection, and adherence to waste disposal regulations.

The other circumstances mentioned do not align with the requirement. A non-professional shipper does not negate the need for a manifest if hazardous waste is involved. Similarly, the weight of the materials is not a determining factor for the necessity of the manifest—it is the type of materials being transported that is critical. Lastly, it is inaccurate to suggest that carriers never need to sign the manifest, as their signature is essential when hazardous waste is being transported.