Cal. Pub. Res. Code § 21156

It is the intent of the Legislature in enacting this chapter that a master environmental impact report shall evaluate the cumulative impacts, growth inducing impacts, and irreversible significant effects on the environment of subsequent projects to the greatest extent feasible. The Legislature further intends that the environmental review of subsequent projects be substantially reduced to the extent that the project impacts have been reviewed and appropriate mitigation measures are set forth in a certified master environmental impact report.