A hazardous waste generator who is accumulating hazardous waste in a containment building without authorization provided by a permit or interim status shall comply with all provisions of this regulation. If hazardous waste is placed in a containment building, the generator shall: Manage the waste in accordance with the requirements of COMAR 26.13.05.18—.18-3; Label the containment building with the words “Hazardous Waste” in a conspicuous place easily visible to employees, visitors, emergency responders, waste handlers, and other persons on site; Provide, in a conspicuous place, a label or signage that: Indicates the hazards of the waste that is being accumulated; Communicates the hazards associated with the waste by: Listing the hazardous waste characteristic or characteristics that the waste exhibits; Providing hazard communication information consistent with the U.S. Department of Transportation requirements at 49 CFR Part 172 Subpart E (labeling) or Subpart F (placarding); Providing a hazard statement or pictogram consistent with the U.S. Occupational Health and Safety Administration Hazard Communication Standard at 29 CFR §1910.1200; Providing a chemical hazard label consistent with the National Fire Protection Association Code 704; or Some other method that is at least as effective as one of the methods listed in §B(3)(b)(i)—(iv) of this regulation; Before accumulating hazardous waste in the unit, obtain and place in the facility’s operating record a certification by a qualified registered professional engineer that the containment building design meets the requirements of COMAR 26.13.05.18-1; and Maintain records at the facility documenting that hazardous waste is not accumulated in the containment building for periods of accumulation longer than 90 days, with the records: Being generated by use of inventory logs, monitoring equipment, or another equally effective means; Consisting of either: Documentation that the containment building is emptied at least once every 90 days; or A written description of the procedures that are followed to ensure that each waste volume remains in the unit for no more than 90 days, a written description of the waste generation and management practices at the facility that shows these practices are consistent with respecting the 90-day limit, and documentation demonstrating that the procedures have been followed; and Being readily available for inspection.