California Code, Government Code - GOV § 31493.6

(a) Any person who qualifies as a member, and who has not elected to be covered by the retirement provisions and benefits available to members, shall become a member of the plan established by this article as of the first day of the month following the date of employment or date of eligibility for membership. Any person who dies prior to certifying his or her election shall be deemed to have elected to be covered by the retirement plan established by this article.

(b) The employer shall, within 14 days of the date of employment or eligibility for membership, provide to each person who qualifies as a member, written disclosure materials of the elements of each of the available retirement plans.

(c) Any person who has been enrolled in the plan provided for in this article pursuant to subdivision (a) may elect to be covered by any other retirement plan to which he or she is otherwise eligible, provided that the election is made in writing and filed with the board within 60 days from his or her beginning date of employment or eligibility for membership, or within 45 days after receipt from the employer of the materials required by subdivision (b), whichever is later. Any person who makes the election shall be deemed to be a member of the elected plan as of the first day of the month following the date of employment or eligibility, and the county auditor shall make appropriate deductions from the member's future salary warrant to cover the member's contributions applicable to the period that the member was deemed to be included in the plan covered by this article.

(d) This section shall be applicable to persons eligible for general membership who become employed on or after January 1, 1992, and to persons who were employed prior to January 1, 1992, but who did not become eligible for membership until January 1, 1992, or later.