GOV §21318: (a) In addition to the increase of allowance authorized by and granted pursuant to Section 21313 and notwithstanding the limitation in subdivision (b) of Section 21329, any monthly allowance computed

(a) In addition to the increase of allowance authorized by and granted pursuant to Section 21313 and notwithstanding the limitation in subdivision (b) of Section 21329, any monthly allowance computed under or limited by any section other than Section 21362, as amended by Chapter 96 of the Statutes of 1971, and paid with respect to a local safety member whose retirement for service or nonindustrial death before retirement occurred, or who was granted an industrial or nonindustrial disability retirement, prior to the date the contracting agency elected to be subject to Section 21362 as so amended, shall be increased by 15 percent. The percentage shall be applied to the allowance payable on the date this section becomes applicable to the contracting agency and the allowance as so increased shall be paid for time on and after that date and until the first day of April immediately following the date of application. The base allowance shall be increased by the same percentage for annual adjustments beginning with the adjustment effective for time commencing with that annual adjustment. (b) For the purposes of this section, all contributions, liabilities, actuarial interest rates, and other valuation factors shall be determined on the basis of actuarial assumptions and methods that, in the aggregate, are reasonable and that, in combination, offer the actuary’s best estimate of anticipated experience under this system. (c) The additional employer contributions required under this section shall be computed as a level percentage of member compensation. The additional contribution rate required at the time this section is added to a contract shall not be less than the sum of (1) the actuarial normal cost and (2) the additional contribution required to amortize the increase in accrued liability attributable to benefits elected under this section over a period of not more than 30 years from the date this section becomes effective in the contracting agency’s contract. (d) This section shall not apply to any contracting agency nor to the employees of any contracting agency unless that agency elected to be subject to the provisions of this section in its contract with the board on or before December 31, 2001.