Cal. Sts. & High. Code § 8706

When made, the reassessment shall constitute a trust fund for the redemption and payment of the original bonds issued against the original assessment; or the legislative body may call in the original issue of bonds outstanding and issue new bonds upon the security of the reassessment in lieu thereof. If the legislative body determines that new bonds shall be issued upon the security of the reassessment, the notice of hearing upon the reassessment shall contain a declaration of intention to issue bonds substantially in the form provided for in Section 8573. Upon confirmation of the reassessment the legislative body may issue the new bonds in the manner that it determines.