What document must employers provide operators upon request concerning hazardous substances?

Employers are required to provide operators with Material Safety Data Sheets (MSDS) upon request regarding hazardous substances. These documents are crucial because they contain detailed information about the properties, hazards, safe handling, storage, and emergency measures related to specific substances. This ensures that employees have access to essential safety information, allowing them to work with hazardous materials responsibly and respond appropriately in case of emergencies.

Having MSDS on hand promotes a safe working environment and helps operators understand the risks associated with the substances they may encounter. This regulatory requirement underscores the commitment to workplace safety and compliance with Occupational Safety and Health Administration (OSHA) regulations, which mandate that such information is available to employees. Other options mentioned, while relevant to workplace safety, do not specifically fulfill the legal obligation of providing detailed hazardous substance information as mandated for MSDS.