Cal. Pub. Res. Code § 29405

Notwithstanding the provisions of Sections 29400, 29401, 29402, and 29403, the local protection program for that portion of the secondary management area west of State Highway Route 680 and outside the city limits of the City of Fairfield as of January 1, 1977, may include only ordinances to be prepared by the county, in cooperation with the City of Benicia, which control grading, erosion, sediment, runoff, and creekside development and which meet the requirements of subdivisions (h) and (i) of Section 29401. Such ordinances shall take into consideration the seismic hazards and unusually erodible and landslide-prone soils at this location, and ensure that development, if any, in this portion of the secondary management area will not cause increased sedimentation within the marsh.