Which document provides crucial safety information regarding chemicals on a project site and is required by OSHA?

The correct answer is the Material Safety Data Sheet (MSDS), which is a critical document that provides detailed information about various chemicals used or present on a project site. These sheets serve several important functions in maintaining workplace safety and compliance with Occupational Safety and Health Administration (OSHA) regulations.

The MSDS includes information on the properties of each chemical, the hazards they may pose, proper handling procedures, first aid measures, and guidelines for safe storage and disposal. This information is vital for any workers who may come into contact with the chemicals, enabling them to understand the risks involved and how to mitigate them effectively.

In contrast, the other options, while related to safety practices, do not specifically serve the same function as an MSDS. For instance, a Construction Safety Plan outlines an overall approach to maintaining safety on the construction site, including general policies and procedures, but does not provide detailed chemical safety information. A Job Safety Analysis focuses on specific tasks and the hazards associated with them but may not include comprehensive chemical information. An Incident Report is used to document accidents and injuries that occur on the job site but does not serve as a guide for chemical safety.

Thus, the MSDS stands out as the essential document required by OSHA for conveying safety information about chemicals