California Code, Public Resources Code - PRC § 21003.1

(a) Comments from the public and public agencies on the environmental effects of a project shall be made to lead agencies as soon as possible in the review of environmental documents, including, but not limited to, draft environmental impact reports and negative declarations, in order to allow the lead agencies to identify, at the earliest possible time in the environmental review process, potential significant effects of a project, alternatives, and mitigation measures which would substantially reduce the effects.

(b) Information relevant to the significant effects of a project, alternatives, and mitigation measures which substantially reduce the effects shall be made available as soon as possible by lead agencies, other public agencies, and interested persons and organizations.

(c) Nothing in subdivisions (a) or (b) reduces or otherwise limits public review or comment periods currently prescribed either by statute or in guidelines prepared and adopted pursuant to Section 21083 for environmental documents, including, but not limited to, draft environmental impact reports and negative declarations.