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Key definitions
  • Key definitions for benzene may be found in this section.

Action level: An airborne concentration of benzene of 0.5 ppm calculated as an eight-hour time-weighted average.

Authorized person: Any person specifically authorized by the employer whose duties require the person to enter a regulated area, or any person entering such an area as a designated representative of employees for the purpose of exercising the right to observe monitoring and measuring procedures under paragraph (l) of 1910.1028, or any other person authorized by the Occupational Safety and Health Act or regulations issued under the Act.

Benzene (C6H6) (CAS Registry No. 71-43-2): Liquefied or gaseous benzene. It includes benzene contained in liquid mixtures and the benzene vapors released by these liquids. It does not include trace amounts of unreacted benzene contained in solid materials.

Bulk wholesale storage facility: A bulk terminal or bulk plant where fuel is stored prior to its delivery to wholesale customers.

Container: Any barrel, bottle, can, cylinder, drum, reaction vessel, storage tank, or the like, but does not include piping systems.

Day: Any part of a calendar day.

Emergency: Any occurrence such as, but not limited to, equipment failure, rupture of containers, or failure of control equipment which may or does result in an unexpected significant release of benzene.

Employee exposure: Exposure to airborne benzene which would occur if the employee were not using respiratory protective equipment.

Regulated area: Any area where airborne concentrations of benzene exceed or can reasonably be expected to exceed, the permissible exposure limit, either the eight-hour time-weighted average exposure of 1 ppm or the short-term exposure limit of 5 ppm for 15 minutes.

Vapor control system: Any equipment used for containing the total vapors displaced during the loading of gasoline, motor fuel or other fuel tank trucks and the displacing of these vapors through a vapor processing system or balancing the vapor with the storage tank. This equipment also includes systems containing the vapors displaced from the storage tank during the unloading of the tank truck which balance the vapors back to the tank truck.