The California Environmental Quality Act (CEQA) requires a lead agency, as defined, to prepare, or cause to be prepared, and certify the completion of an environmental impact report on a project that it proposes to carry out or approve that may have a significant effect on the environment or to adopt a negative declaration if it finds that the project will not have that effect. CEQA also requires a lead agency to prepare a mitigated negative declaration for a project that may have a significant effect on the environment if revisions in the project would avoid or mitigate that effect and there is no substantial evidence that the project, as revised, would have a significant effect on the environment. Existing law requires a lead agency to be responsible for determining whether the project is exempt from CEQA and whether an environmental impact report, negative declaration, or mitigated negative declaration is required, as provided. Existing law, for certain projects, establishes a ministerial review process with modified environmental assessment procedures, as provided.