(a) An environmental impact report for a redevelopment plan may be a master environmental impact report, program environmental impact report, or a project environmental impact report. Any environmental impact report for a redevelopment plan shall specify the type of environmental impact report that is prepared for the redevelopment plan.
(b) If the environmental impact report for a redevelopment plan is a project environmental impact report, all public and private activities or undertakings pursuant to, or in furtherance of, a redevelopment plan shall be deemed to be a single project. However, further environmental review of any public or private activity or undertaking pursuant to, or in furtherance of, a redevelopment plan for which a project environmental impact report has been certified shall be conducted if any of the events specified in Section 21166 have occurred.