CA Gov't Code Section 9356.15

Any person who is a member of the system pursuant to Section 9355.45 may also receive credit for state service prior to the date he or she became a member, whether that service was rendered before or after the operative date of this section, provided that he or she makes the contributions required by Section 9357.2, but at the rate of 612 percent. If he or she elects to make a contribution with respect to service credited under the Public Employees’ Retirement System, he or she shall receive a refund of his or her accumulated contributions in that system with respect to all of his or her state service. The contribution rate for a person who first commences service in any of the offices listed in Section 9350.55 or who becomes a member of this system on or after January 1, 1982, shall be 8 percent.