California Code, Education Code - EDC § 22328

(a) Upon termination of a retirement allowance or disability allowance that began to accrue on or after July 1, 1972, the person's individual account shall be credited with the amount of his or her accumulated retirement contributions as they were on the effective date of retirement or disability, less the sum of all payments made under paragraph (1) of subdivision (a) of Section 24202, and under Sections 24006 and 24007.  The reduction shall not be greater than the total of the accumulated retirement contributions.

(b) Upon the termination of a retirement allowance, the person's accumulated annuity deposit contribution accounts shall be credited with the amounts of the contributions as they were on the date the annuity became payable because of the retirement less the sum of all payments made under paragraph (2) of subdivision (a) of Section 24202.