Explanation:
Employees who are required to work with hazardous chemicals--in a manner that results in a duration and frequency of exposure greater than what a normal consumer would experience--have a right to know about the properties of those hazardous chemicals. Cleaning the outside of storage tanks typically would take much more time than cleaning a toilet bowl. Similarly, if your job is to clean toilets, your frequency of exposure would be much greater than someone cleaning a toilet in a home.