A properly prepared uniform hazardous waste manifest must be ____.

A properly prepared uniform hazardous waste manifest must be signed and carried by anyone transporting hazardous waste because it serves as a crucial legal document that tracks the movement of hazardous waste from the generator (the person or business that created the waste) to the designated disposal facility. This manifest ensures accountability and compliance with regulations governed by the Environmental Protection Agency (EPA) and state authorities.

The requirement for a signature indicates that the transporter acknowledges the responsibility for the waste being transported and the obligations that come with it, including proper handling and disposal. Carrying the manifest during transport is essential to provide documentation for authorities in case of inspections or emergencies. This ensures that hazardous materials are managed safely and properly throughout their journey.

Options that suggest submitting the manifest online, keeping it in a file, or posting it on the vehicle do not fulfill the essential requirement of having a signed document in possession during transportation, which is key to legal and safe management of hazardous wastes.