Cal. Gov. Code § 91008

Not more than one judgment on the merits with respect to any violation may be obtained under Sections 91004 and 91005. Actions brought for the same violation or violations shall have precedence for purposes of trial in order of the time filed. Such actions shall be dismissed once judgment has been entered or a settlement approved by the court in a previously filed action. The court may dismiss a pending action without prejudice to any other action for failure of the plaintiff to proceed diligently and in good faith. The action may be so dismissed on motion of the civil prosecutor or any plaintiff in an action based on the same violation.