(a) At any point after reviewing the information submitted in compliance with sections 613-6.2 through 613-6.4 of this Subpart, the department may require the facility to submit additional information or to develop and submit a corrective action plan for responding to contaminated soils and groundwater. If a plan is required, the facility must submit the plan according to a schedule and format established by the department. Alternatively, the facility may, after fulfilling the requirements of sections 613-6.2 through 613-6.4 of this Subpart, choose to submit a corrective action plan for responding to contaminated soil and groundwater. In either case, the facility is responsible for submitting a plan that provides for adequate protection of public health and the environment as determined by the department, and must modify the facility’s plan as necessary to meet this standard.

(b) The department will approve the corrective action plan only after ensuring that implementation of the plan will adequately protect public health, safety, and the environment. In making this determination, the department will consider the following factors as appropriate:

(c) Upon approval of the corrective action plan or as directed by the department, the facility must implement the plan, including modifications to the plan made by the department. The facility must monitor, evaluate, and report the results of implementing the plan in accordance with a schedule and in a format established by the department.

(d) The facility may, in the interest of minimizing environmental contamination and promoting more effective cleanup, begin cleanup of soil and groundwater before the corrective action plan is approved provided that the facility: