Cal. Code Regs. tit. 3 § 1180.45
The management of a licensed establishment desiring to work under conditions which will require the services of an employee of the Bureau on any Saturday, Sunday, or holiday, or for more than eight hours on any other day, shall sufficiently in advance of the period of overtime, request the inspector to furnish inspection service during such overtime period, and shall pay the Director therefor an amount sufficient to reimburse the Department for the cost of the inspection services so furnished. The request shall provide that if the overtime charge is not paid within 10 days of billing therefor, the Director may bring an action for collection of such fees, including attorney fees and other costs of collection. A minimum charge for four hours work time shall be assessed the establishment in cases when the time worked by the inspector is less than four hours. Failure on the part of an establishment to pay overtime fees within 10 days after they have been billed for such fees shall be sufficient cause for the Director to refuse to furnish further overtime inspection.
Cal. Code Regs. Tit. 3, § 1180.45