What high-heat procedure must be implemented by a highway striping contractor when outdoor temperatures reach or exceed 95 degrees Fahrenheit under Cal/OSHA heat illness rules?

1. Shut down all work permanently until the following winter season.
2. Require workers to work 12 consecutive hours without taking breaks.
3. Double the production speed of thermoplastic melter equipment.
4. Conduct mandatory 10-minute cool-down rest periods every 2 hours.