The normal rates of contribution of general and safety members subject to the California Public Employees’ Pension Reform Act of 2013 shall be determined pursuant to Section 7522.30 subject to the following exceptions:
(a) The board may, but is not required to, apply the provisions of subdivision (c) of Section 7522.30 that require the initial contribution rate to be rounded to the nearest quarter of 1 percent.
(b) Subdivision (d) of Section 7522.30 shall not apply to the contribution rates of members of retirement systems established pursuant to this chapter.