LUNCH AND RECESS SUPERVISION. When an employee accepts either occasional or regular duty for recess or lunch supervision during the employee’s duty free lunch or designated planning time, extra compensation will be allocated at the rate of $15.00 per 30- minute period. Such duty will be voluntary (except in the case of an emergency) and will be treated as an extra duty contract in cases where an employee elects to perform the duty on a regular basis for the duration of a school year.