Upon receipt of notification from the Department that an elementary school's out-of-school suspension rate exceeds the standard specified in §B of this regulation, the local school superintendent or the superintendent's designee shall direct the principal of the school to implement: A PBIS; or An alternative behavioral modification program developed in collaboration with the Department. An elementary school is subject to this regulation if it has an out-of-school suspension rate that exceeds: 18 percent of its enrollment for the 2005—2006 school year; 16 percent of its enrollment for the 2006—2007 school year; 14 percent of its enrollment for the 2007—2008 school year; 12 percent of its enrollment for the 2008—2009 school year; and 10 percent of its enrollment for the 2009—2010 school year and each school year thereafter. The school principal or the principal's designee and appropriate staff members shall: Develop a plan for implementing a program as set forth in §A of this regulation; Attend PBIS or alternative behavior modification training program approved by the Department; and Follow implementation guidelines and practices for PBIS or the alternative behavior modification training program. The following apply to an elementary school that has at least one grade beyond grade 5: The suspension rates in §B of this regulation shall apply to students in prekindergarten through grade 5; and PBIS or the alternative behavioral modification program shall focus on students in prekindergarten through grade 5. Nothing in this regulation precludes a school system from implementing PBIS or an alternative behavioral modification program either in specific schools or system-wide. An elementary school shall expand its existing PBIS or alternative behavior modification program by providing more intensive interventions to targeted students in need of such interventions if: The elementary school has already implemented a PBIS or an alternative behavior modification program; and The elementary school has a suspension rate that exceeds the standard specified in §B of this regulation.