California Code, Fish and Game Code - FGC § 15409

(a) Upon termination of a lease, for any reason, all structures shall be removed at the lessee's expense from the leasehold, and the area shall be restored to its original condition.  If the lessee fails to remove the structures, the state may remove them and the lessee shall pay the removal costs incurred.

(b) The commission shall require financial assurances of each marine finfish aquaculture lessee to ensure that restoration is performed to the satisfaction of the commission.  Financial assurances may take the form of surety bonds executed by an admitted surety insurer, irrevocable letters of credit, trust funds, or other forms of financial assurances specified by the commission, as it determines are available and adequate to ensure the lease site is restored pursuant to this section.

(c) Marine finfish aquaculture lessees shall be responsible for any damages caused by their operations, as determined by the commission, including, but not limited to, reimbursement for any costs for natural resource damage assessment.

(d) Nothing in this section limits the state in pursuing additional remedies authorized by law.