California Code, Government Code - GOV § 31676.6

This section shall apply only to counties coming under the provisions of Section 31676.1 prior to January 1, 1953.  If a member files an election pursuant to Section 31676.3 and does not file an election pursuant to Section 31676.4, and either he has no accumulated additional contributions to his credit or the accumulated contributions to his credit are less than payments due for credit for prior service subsequent to June 30, 1921, the amount due or balance thereof shall be paid by additional salary deductions in the amounts specified by the member but in no case less than six dollars ($6) per month.  The total amount due shall be paid prior to the effective date of his retirement.