Guidelines and standards for the retention and disposition of student records maintained under this title shall be those adopted in the Maryland Student Records System Manual. Individual student records not required or specifically regulated by other State or local regulations shall be destroyed when they no longer serve legitimate education purposes, subject to the following exceptions: The local school system or educational institution may not destroy any student record if there is an outstanding request to inspect and review them under Regulation .13 of this chapter; Explanations placed in the education record under Regulation .15 of this chapter shall be maintained as provided in Regulation .15D of this chapter; and The record of access required under Regulation .20 of this chapter shall be maintained for as long as the education record to which it pertains is maintained.