For the purpose of carrying out the provisions of this title, the Director of Finance may by executive order authorize the withdrawal from the General Fund of an amount or amounts not to exceed the amount of the unsold bonds which the committee has by resolution authorized to be sold for the purpose of carrying out this title. Any amounts withdrawn shall be deposited in the fund and shall be disbursed by the board in accordance with this title. Any money made available under this section to the board shall be returned by the board to the General Fund from moneys received from the sale of bonds sold for the purpose of carrying out this title. These withdrawals from the General Fund shall be returned to the General Fund with interest at the rate which would have otherwise been earned by these sums in the Pooled Money Investment Fund.