Cal. Pub. Res. Code § 4562

In order to reduce the incidence and spread of fire on timberlands, the board shall adopt rules in the fire protection zone as such zone is defined by the board, including, but not limited to, land along either side of the rights-of-way along public roads in widths to be determined by rule by the board in various areas, and in such other areas as the board deems necessary, to govern the disposal of solid nonforest wastes and slash created by timber operations.