California Code, Water Code - WAT § 78647.7

(a) A delineation of the watershed area or areas critical for project purposes using available hydrogeologic or other pertinent information.  If no information is available, the project shall conduct, to the extent practicable, vulnerability assessments in the watershed area, including identification of risks to drinking water, a project may use delineations and vulnerability assessments undertaken to identify groundwater sources under a wellhead protection program, surface or groundwater sources under a pesticide management plan, or surface water sources under a state or local watershed initiative, or undertaken in accordance with Subpart H (commencing with Section 141.70) of Part 141 of Title 40 of the Code of Federal Regulations.

(b) An identification, to the maximum extent practicable, of the origins of drinking water contaminants that may be addressed by a project, including, to the maximum extent practicable, a description of the specific activities contributing to the presence of the contaminants in the watershed.