The directive mainly uses a question and response format based on OSHA’s interpretation letters of the standard dating back to 1992, which are also available to search and view individually online.
Questions include whether the amount of a hazardous chemical stored at a facility requires compliance. In many responses, 10,000 pounds is the limit level before compliance is required.
Other questions look into how chemicals are monitored and how they must be stored, for example, the types and specificity or acceptable barriers between liquid storage tanks.
There is also guidance on whether discrete operations within refineries and chemical plants are connected in such a way as to require compliance.