For the purposes of carrying out the provisions of this article, the Director of Finance may, pursuant to appropriate authority in each annual Budget Act, authorize the withdrawal from the General Fund of an amount or amounts not to exceed the amount of the unsold bonds which have been authorized to be sold for the purpose of carrying out this chapter. Any amounts withdrawn shall be deposited in the fund. Any moneys made available under this section shall be returned to the General Fund from moneys received from the sale of bonds for the purpose of carrying out the provisions of this chapter. The withdrawals from the General Fund shall be returned to the General Fund with interest at the rate which would otherwise have been earned by those sums in the Pooled Money Investment Fund.