California Code, Streets and Highways Code - SHC § 10424.2

(a) If the Orange County Board of Supervisors determines, subsequent to the issuance of bonds, that the acquisition or construction of all or any part of the proposed improvement will be delayed beyond the date upon which, at the time the bonds were issued, the acquisition or construction was expected to occur, the balance then on deposit in the improvement fund, or the portion specified by the board, may, at the direction of the board, be applied to call outstanding bonds called for redemption.  The call and redemption of bonds pursuant to this section shall not cause the amount of any assessment to be reduced.  The board shall cause any annual assessment installments occurring after any redemption under this section to be reduced to the maximum extent permitted by law.

(b) The board may, from time to time, issue bonds in an aggregate principal amount not in excess of the principal amount of bonds called for redemption pursuant to subdivision (a).  The net proceeds derived from the sale of the bonds shall be deposited in the improvement fund.