(a)
Any member may redeposit in the retirement fund, prior to filing an application for retirement, by lump sum payment or by installment payments over a period of one year or for a longer time upon approval of the board, an amount equal to all of the accumulated normal contributions which he has withdrawn, plus regular interest thereon from the date of separation from the retirement system, and his membership is the same as if unbroken by such termination. Except as provided in this section his rate of contribution shall be based on age at the nearest birthday at time of reentrance into the system. If he does not redeposit all of the accumulated normal contributions previously withdrawn he shall be considered as a new member without credit for any previous service.
“Regular interest” as used in this section shall mean that amount of interest which would have been credited to the account of the member on the amount to be deposited at the interest rates established for the system if the contributions required by this section had been on deposit from the date of separation from the retirement system until the amount required to be deposited has been paid.
(b)
Any member who left county service on or before December 31, 1971, and thereafter again became a member of the county system which he left and (1) who did not withdraw his accumulated normal contributions, or (2) who elected to leave his accumulated normal contributions on deposit pursuant to Article 9 (commencing with Section 31700), or (3) who redeposited or redeposits withdrawn accumulated normal contributions plus interest as authorized in this section, shall be eligible for all benefits granted a member entering a reciprocal retirement system under Article 15 (commencing with Section 31830), including the benefits granted to members who left their accumulated contributions on deposit or who redeposited their accumulated contributions pursuant to Section 31831.1. This paragraph shall not be applicable to any member entering service after December 31, 1977.
(c)
Any member who left county service on or after January 1, 1972, and who within 90 days thereafter again became a member of the county system which he left and (1) who did not withdraw his accumulated normal contributions, or (2) who elected to leave his accumulated normal contributions on deposit pursuant to Article 9 (commencing with Section 31700), or (3) who redeposits or redeposited his withdrawn accumulated normal contributions plus interest as authorized by Section 31652 within 180 days after leaving county service, shall be eligible for all benefits granted a member entering a reciprocal retirement system under Article 15 (commencing with Section 31830), except that Section 31831.1 shall not apply to such members.
(d)
This section shall not apply to members who are retired or who are not in service of an employer making him a member of this system.