California Code, Public Resources Code - PRC § 31006

(a) “Coastal zone” means that area of the state as defined in Section 30103.  Only for purposes of conservancy action in San Francisco Bay, the “coastal zone” also includes areas that are within the permit jurisdiction of the bay commission, as described in Section 66610 of the Government Code, with the exception of Contra Costa County lands from the Richmond-San Rafael Bridge north and east to the termination of the bay commission boundary, except as provided in subdivision (b), as well as any uplands, wetlands, marshes, diked lands, and other watershed lands that significantly affect the environmental quality of the bay or are directly related to the public's use and enjoyment of the bay, and other watershed lands within the nine counties adjacent to the bay that have waters that flow directly into the bay or the ocean.

(b) Notwithstanding subdivision (a), with respect to lands within Contra Costa County that are included within the permit jurisdiction of the bay commission, as described in Section 66610 of the Government Code, or that consist of any uplands, wetlands, marshes, diked lands, or other watershed lands that significantly affect the environmental quality of the bay or are directly related to the public's use and enjoyment of the bay, the local public agency having jurisdiction over any such lands may formally request conservancy action by resolution.