Cal. Code Regs. tit. 14 § 15165
Where individual projects are, or a phased project is, to be undertaken and where the total undertaking comprises a project with significant environmental effect, the lead agency shall prepare a single program EIR for the ultimate project as described in Section 15168. Where an individual project is a necessary precedent for action on a larger project, or commits the lead agency to a larger project, with significant environmental effect, an EIR must address itself to the scope of the larger project. Where one project is one of several similar projects of a public agency, but is not deemed a part of a larger undertaking or a larger project, the agency may prepare one EIR for all projects, or one for each project, but shall in either case comment upon the cumulative effect.
Cal. Code Regs. Tit. 14, § 15165
Note: Authority cited: Section 21083, Public Resources Code. Reference: Sections 21061, 21100 and 21151, Public Resources Code; Whitman v. Board of Supervisors, 88 Cal. App. 3d 397 (1979).