Gov. Code, § 31699.7

(a) The postemployment health benefits fund board shall establish the terms and conditions for a public agency and its trust fund to participate in the postemployment health benefits fund, including, but not limited to, eligibility to participate, amount of assets transferred to the fund, investments, withdrawal, transfer of assets to or from the fund, termination of participation, and reporting to the public agency.

(b) The postemployment health benefits fund board shall account separately for each public agency and its trust fund with respect to contributions, withdrawals, earnings, losses, fees paid to third-party vendors, expenses, and all other relevant items. Any expenses charged to the postemployment health benefits fund by the retirement system shall be reported at least monthly by the postemployment health benefits board in its public records and shall be reported at least annually to each agency or trust that participates in the postemployment health benefits fund. The portion of the postemployment health benefits fund that is attributable to each public agency and its trust fund after the accounting, including each agency’s and trust fund’s allocated share of expenses as provided in this section, shall be used only for the exclusive benefit of the employees of that agency.

(c) The postemployment health benefits fund board shall, by resolution, establish all rules, regulations, or bylaws for the administration of the postemployment health benefits fund, including any revision that it deems appropriate, and shall have sole discretion to interpret those rules, regulations, or bylaws.