(a) If the Department finds a situation, condition or practice which violates this Act or any rule promulgated thereunder which does not constitute a Type “AA”, Type “A”, Type “B”, or Type “C” violation, the Department shall issue an administrative warning. Any administrative warning shall be served upon the facility in the same manner as the notice of violation under Section 3-301. The facility shall be responsible for correcting the situation, condition or practice; however, no written plan of correction need be submitted for an administrative warning, except for violations of Sections 3-401 through 3-413 or the rules promulgated thereunder. A written plan of correction is required to be filed for an administrative warning issued for violations of Sections 3-401 through 3-413 or the rules promulgated thereunder.
     (b) If, however, the situation, condition or practice which resulted in the issuance of an administrative warning, with the exception of administrative warnings issued pursuant to Sections 3-401 through 3-413 or the rules promulgated thereunder, is not corrected by the next on-site inspection by the Department which occurs no earlier than 90 days from the issuance of the administrative warning, a written plan of correction must be submitted in the same manner as provided in subsection (b) of Section 3-303.