(a) This division shall not apply to any railroad grade separation project that eliminates an existing grade crossing or that reconstructs an existing grade separation.
(b) (1) Whenever a state agency determines that a project is not subject to this division pursuant to this section, and it approves or determines to carry out the project, the state agency shall file a notice with the Office of Planning and Research in the manner specified in subdivisions (b) and (c) of Section 21108.
(2) Whenever a local agency determines that a project is not subject to this division pursuant to this section, and it approves or determines to carry out the project, the local agency shall file a notice with the Office of Planning and Research and with the county clerk in each county in which the project will be located in the manner specified in subdivisions (b) and (c) of Section 21152.