Learn the major DOT placards in your area, and what the properties are for those chemicals. It is important to learn how they can hurt you and what you can do to protect yourself from them before they are released.
It is not a good idea to wait until you have 9000 gallons of it running rampient, before you learn the ways it can hurt you.
1203- Gasoline 1075-Propane 2810-Mustard Gas or unknown inhalation hazard are some of the most common in our area.