The preparation of an environmental document required under this Article is intended to assist the responsible agency in determining the appropriate decision on the proposed action. An environmental document required under this Article is a necessary part of an application or other request for agency action. Administrative and judicial review of an environmental document is incidental to, and may only be undertaken in connection with, review of the agency action. No other review of an environmental document is allowed. (1991 (Reg. Sess., 1992), c. 945, ss. 5, 7(a).)