If a Class 7 package leaks liquid or powder during transport, what immediate action must the driver take?

1. Isolate the vehicle, restrict access, stay upwind, avoid touching the spill, and contact emergency services and the Radiation Protection Adviser (RPA)
2. Mop up the spill with a personal handkerchief and place it in the cab glovebox
3. Wash the spill down storm drains using a high-pressure hose
4. Blow the powder away using the vehicle cab heater fan