Cal. CCP § 1263.720

(a) Upon petition of any party to the proceeding, the court in which the proceeding is brought shall specially set for hearing the issue of whether any hazardous material is present within the property to be taken.

(b) If the court determines that any hazardous material is present within the property to be taken, the court shall do all of the following:

(1) Identify those measures constituting the required action with regard to the hazardous material, the probable cost of the required action, and the party that shall be designated by the court to cause the required action to be performed.

(2) Designate a trustee to monitor the completion of the required action and to hold funds, deducted from amounts that are otherwise to be paid to the defendant pursuant to this title, to defray the probable cost of the required action.

(3) Transfer to the trustee funds necessary to defray the probable cost of the required action from amounts deposited with the court pursuant to Article 1 (commencing with Section 1255.010) of Chapter 6 or pursuant to Section 1268.110. In the case of any payment to be made directly to the defendant pursuant to Section 1268.010, the plaintiff shall first pay to the trustee the amount necessary to defray the probable cost of the required action, as identified by the court, and shall pay the remainder of the judgment to the defendant. The total amount transferred or paid to the trustee pursuant to this paragraph shall not exceed an amount equal to 75 percent of the following, as applicable:

(A) Prior to entry of judgment, the amount deposited as the probable amount of compensation pursuant to Article 1 (commencing with Section 1255.010) of Chapter 6.

(B) Subsequent to entry of judgment, the fair market value of the property taken, as determined pursuant to Article 4 (commencing with Section 1263.310). If the amount determined as fair market value pursuant to that article exceeds the amount deposited pursuant to Article 1 (commencing with Section 1255.010) of Chapter 6, that excess shall be available, subject to the 75 percent limit set forth in this paragraph, for transfer to the trustee for the purposes of this paragraph or for reimbursement of the plaintiff for payments made to the trustee pursuant to this paragraph. If the amount determined as fair market value pursuant to Article 4 (commencing with Section 1263.310) is less than the amount deposited pursuant to Article 1 (commencing with Section 1255.010) of Chapter 6, the plaintiff shall be entitled to a return of amounts thereby deposited, a judgment against the defendant, or both, as necessary to ensure that the total amount transferred or paid to the trustee pursuant to this paragraph not exceed an amount equal to 75 percent of the fair market value of the property taken, as determined pursuant to Article 4 (commencing with Section 1263.310).

(4) Establish a procedure by which the trustee shall make one or more payments from the funds it receives pursuant to paragraph (3) to the party causing the required action to be performed, upon completion of all or specified portions of the required action. Any amount of those funds that remains following the completion of all of the required action shall be applied in accordance with the provisions of this title that govern the disposition of the deposit amounts referred to in paragraph (3).

(c) The actual and reasonable costs of the trustee incurred pursuant to this section shall be paid by the plaintiff.