Cal. Code Regs. tit. 2 § 2124
Each lease shall provide that at the expiration of the lease or sooner termination thereof the lessee shall surrender the premises leased, with all permanent improvements thereon, in good order and condition, or, at the option of the commission and as specified by the commission, the lessee shall remove such structures, fixtures and other things as have been put on the lease by the lessee, all removal costs to be borne by the lessee, subject to the lessee's right to remove his equipment as provided in the statutes. Notwithstanding any provision of these regulations, the lessee shall have the right to remove any and all drilling and producing platforms and other oil field development and producing equipment having a re-use or salvage value.
Cal. Code Regs. Tit. 2, § 2124