(1) The agency may contract for preparation of an EIS or portions thereof. Whenever an EIS or portion thereof is prepared by a contractor, the agency shall furnish guidance and participate in the preparation, independently evaluate the statement or portion thereof prior to its approval, and take responsibility for its scope and content.

(2) A person contracting with the agency in the preparation of an EIS must execute a disclosure statement, in affidavit form prepared by the agency, specifying that he has no financial or other interest in the outcome of the proposed action other than a contract with the agency.