Usually, any agreement to waive the employee’s right to sue under PAGA is unenforceable. But there is an exception for collective bargaining agreements that cover construction workers, provide for wages, hours and working conditions, set forth a grievance and arbitration remedy for Labor Code violations, allow the arbitrator to award all remedies authorized by the Labor Code and clearly waive the right to sue under PAGA. (Lab. Code 2699.6(a).) The defendant employer’s collective bargaining agreement with its employees’ union met those requirements so the trial court should have ordered arbitration of all the employees’ claims, including their PAGA claims, in accordance with the collective bargaining agreement.