Government Code § 20826
CHAPTER 9. Employer Contributions
The board shall certify to the Controller at the end of each quarter the total amount of compensation in respect to which state contributions are payable from the General Fund and each other fund in the State Treasury, and the Controller shall transfer the state’s contribution from each fund, respectively, to the retirement fund. Compensation shall be included in the certification at the end of the month in which the member’s contributions based upon it are paid.