Government Code § 31894
ARTICLE 17. Integration with Federal Old Age, Survivors, and Disability Insurance
Notwithstanding the provisions of Section 31893, however, before the board shall execute on behalf of the State an agreement with the federal agency as herein provided, the pension board and the board shall enter into a written agreement, which agreement shall include such provisions not inconsistent with this article which the board deems necessary in the administration of the said federal system as it affects the State and the county and its employees.