A pesticide may be applied in a school building or on school grounds without prior notification only if an emergency pest situation exists. Within 24 hours after an emergency pesticide application, or on the next school day, the school shall notify: The parent or guardian of each student and each staff member at an elementary school according to Regulation .05 of this chapter; or Each parent or guardian and staff member on the pesticide notification list provided by Regulation .04B of this chapter, for a middle school or high school according to Regulation .06 of this chapter.