Which of the following is NOT an example of interim controls?

Interim controls are measures designed to reduce lead exposure while more permanent solutions are evaluated or implemented. These controls focus on managing lead hazards without completely eliminating them.

Complete removal of lead paint is not considered an interim control because it represents a permanent solution to a lead hazard. Instead, it completely eliminates the lead source from the environment, rather than simply managing or minimizing exposure. The other choices provided—smoothing surfaces, covering with rocks, and planting vegetation—are all strategies used to manage lead risks temporarily. They aim to reduce the potential for lead dust or particles to become airborne or accessible, but they do not remove the lead source itself.

By understanding the distinction between permanent solutions and interim controls, it becomes clear why removing lead paint does not fit the definition of interim controls, as it eliminates the hazard entirely rather than just managing it.