explain the role of the states in the regulation of hazardous material, environmental science homework help

1. Explain the role of the states in the regulation of hazardous material spills and releases under DOT, EPA, and OSHA.

2. What are the differences between threshold limit value and permissible exposure limit? Which one should be used when considering the toxicity of a spilled hazardous material?

3. In a spill response operation, one of the basic operating principles is to not make the situation worse. Discuss a real or imagined spill scenario, and explain two or more actions that might make the situation worse

4. Discuss how vapor density and vapor pressure contribute to the hazards of a spilled or released hazardous material. Provide examples that illustrate your points.