A trust fund account to be designated as "employees retirement fund" shall be opened upon the books of the retirement board, or treasurer and auditor if authorized by the board, of any county adopting this retirement system.
The "employees retirement fund" shall be a trust fund created or continued and administered in accordance with this chapter, solely for the benefit of the members and retired members of the system and their survivors and beneficiaries.
Nothing in this section shall be construed to prohibit the retirement board paying administrative costs, already authorized or to be authorized, or to prohibit the transfer of surplus funds to county advance reserves.
Ca. Gov. Code § 31588