Cal. CCP § 1952.3

Notwithstanding any other provision of the law, the court, on its own motion, may order the destruction or other disposition of any exhibit, deposition, or administrative record introduced in the trial or posttrial hearing of a civil action or proceeding or filed in the action or proceeding that, if appeal has not been taken from the decision of the court in the action or proceeding, remains in the custody of the court or clerk five years after time for appeal has expired, or, if appeal has been taken, remains in the custody of the court or clerk five years after final determination thereof, or that remains in the custody of the court or clerk for a period of five years after any of the following:

(a) A motion for a new trial has been granted and a memorandum to set the case for trial has not been filed, or a motion to set for trial has not been made within five years.

(b) The dismissal of the action or proceeding.

In addition, the court on its own motion, may order the destruction or other disposition of any exhibit, deposition, or administrative record that remains in the custody of the court or clerk for a period of 10 years after the introduction or filing of the action or proceeding if, in the discretion of the court, the exhibit, deposition, or administrative record should be disposed of or destroyed.

The order shall be entered in the register of actions of each case in which the order is made.

No exhibit, deposition, or administrative record shall be ordered destroyed or otherwise disposed of pursuant to this section if a party to the action or proceeding files a written notice with the court requesting the preservation of any exhibit, deposition, or administrative record for a stated time, but not to exceed one year.

Any sealed file shall be retained for at least two years after the date on which destruction would otherwise be authorized pursuant to this section.