California Code, Education Code - EDC § 15235

Any money paid into the county treasury of the county and credited to the interest and sinking fund of any district remaining after the payment of all bonds and coupons payable from the fund, or which is in excess of an amount sufficient to pay all unpaid bonds and coupons payable from the fund, shall be transferred to the special reserve fund of the school district, or designated building fund of the community college district upon the order of the auditor, and may be used only for the purpose specified in Section 42840 or in accordance with the California Community Colleges Budget and Accounting Manual and for no other purpose.