Sec. 13. If the commissioner approves or modifies and approves a proposed voluntary remediation work plan under this chapter, the commissioner shall notify the applicant in writing, under the applicable provisions set forth in IC 4-21.5-3-5(b) and IC 4-21.5-3-5(c), of the following:
(1) That the voluntary remediation work plan has been approved or modified and approved.
(2) The date:
(A) the applicant may begin implementing the work plan; and
(B) by which the work plan must be completed.
(3) The applicant's right to appeal the commissioner's decision under IC 4-21.5.