Cal. Civ. Code § 8104

(a) A direct contractor or subcontractor on a work of improvement governed by this part that employs a laborer and fails to pay the full compensation due the laborer, including any employer payments described in Section 1773.1 of the Labor Code and implementing regulations, shall not later than the date the compensation became delinquent, give the laborer, the laborer’s bargaining representative, if any, the construction lender or reputed construction lender, if any, and the owner or reputed owner, notice that includes all of the following information, in addition to the information required by Section 8102:
1. (1) The name and address of the laborer, and of any person or entity described in subdivision (b) of Section 8024 to which employer payments are due.
2. (2) The total number of straight time and overtime hours worked by the laborer on each job.
3. (3) The amount then past due and owing.
(b) Failure to give the notice required by subdivision (a) constitutes grounds for disciplinary action under the Contractors’ State License Law, Chapter 9 (commencing with Section 7000) of Division 3 of the Business and Professions Code.