Final answer:
In the event of a WMM storage facility flood, you should notify the DDESB, EPA, and state/local authorities within 24 hours and follow up with a written report to the same entities.
Step-by-step explanation:
When a WMM storage facility floods and toxic material is washed out, it is crucial to notify proper authorities to address the environmental and health risks involved. You are correct to notify the DDESB, EPA, and state/local authorities within 24 hours. Following this initial notification, it is mandatory to follow up with a written report to the same entities, namely the DDESB, EPA, and state/local authorities. This action ensures that the officials have all the information necessary to take appropriate measures in response to the contamination, such as waste removal or establishing an evacuation zone.
Considering the regulatory framework provided by the United States Department of Transportation and the EPA's hazardous waste regulations, this step maintains compliance with the legal requirements for managing hazardous waste and responding to accidents involving such materials.