California Code, Public Resources Code - PRC § 43220

The board, in conjunction with an inspection conducted by the local enforcement agency, shall conduct at least one inspection every 18 months of each solid waste landfill and transformation facility in the state.  A written inspection report shall be prepared and submitted within 30 days of the inspection to the local enforcement agency.  If the board identifies any significant violation of state minimum standards that was not resolved through previous inspections by the local enforcement agency, the board shall take appropriate action as authorized by Sections 43215 and 43216.5 and subdivision (d) of Section 43219.