(1) Upon completion of a response activity a person may request a certificate of completion from the department.

    (2) To obtain a certificate of completion from the department under this section, a person shall submit each of the following to the department:

    (a) A certificate of completion request form. The department shall specify the required content of the request form and make the form available on the department's website.

    (b) Documentation of the completed response activity.

    (3) Upon receipt of a request for a certificate of completion submitted under this subsection, the department shall issue a certificate or deny the request, or shall notify the submitter that there is not sufficient information for the department to make a decision. If the department's response is that the request does not include sufficient information, the department shall identify the information that is required for the department to make a decision. If the request is denied, the department's denial shall, to the extent practical, state with specificity all of the reasons for denial. The department shall make a decision under this subsection and shall provide the person submitting the request with a certificate of completion, as appropriate, within 1 of the following time frames, as applicable:

    (a) 150 days after the request was received by the department if the response activity was undertaken without prior approval of the department and the department determines that the response activity complies with the applicable requirements of this part.

    (b) 90 days after the request was received by the department if the response activity was undertaken pursuant to a response activity plan that was approved under section 20114b and the department determines that the response activity was completed in accordance with the approved plan.

    (4) If the department fails to provide a written response within the time frame required by subsection (3), the response activity is considered approved.

    (5) Any time frame required by this section may be extended by mutual agreement of the department and a person submitting a request for a certificate of completion or a person who has received a certificate of completion. An agreement extending a time frame shall be in writing.

    (6) A person requesting a certificate of completion may appeal the department's decision in accordance with section 20114e, if applicable.