(1) The department and the attorney general may enter into a consent order with a person that is liable under section 21323a or any group of persons that are liable under section 21323a to perform corrective action if the department and the attorney general determine that the persons that are liable under section 21323a will properly implement the corrective action and that the consent order is in the public interest, will expedite effective corrective action, and will minimize litigation. The consent order may, as determined appropriate by the department and the attorney general, provide for implementation by a person or any group of persons that are liable under section 21323a of any portion of corrective action at the property. A decision of the attorney general not to enter into a consent order under this part is not subject to judicial review.

    (2) Whenever practical and in the public interest, as determined by the department, the department and the attorney general shall as promptly as possible reach a final settlement with a person in an administrative or civil action under this part if this settlement involves only a minor portion of the response costs at the property concerned and, in the judgment of the department and the attorney general, the conditions in either of the following are met:

    (a) Both of the following are minimal in comparison to other regulated substances at the property:

    (i) The amount of the regulated substances contributed by that person to the property.

    (ii) The toxic or other regulated effects of the substances contributed by that person to the property.

    (b) Except as provided in subsection (3), the person meets all of the following conditions:

    (i) The person is the owner of the property on or in which the underground storage tank system is or was located.

    (ii) The person did not conduct or permit the generation, transportation, storage, treatment, or disposal of any regulated substance at the property.

    (iii) The person did not contribute to the release or threat of release of a regulated substance at the property through any action or omission.

    (3) A settlement shall not be made under subsection (2)(b) if the person purchased the property with actual or constructive knowledge that the property was used for the generation, transportation, storage, treatment, or disposal of a regulated substance.

    (4) A settlement under subsection (2) may be set aside if information obtained after the settlement indicates that the person settling does not meet the conditions set forth in subsection (2)(a) or (b).