Health and Safety Code § 1179.92

The committee shall determine whether or not it is necessary or desirable to issue bonds authorized pursuant to this part in order to carry out the actions specified in Section 1179.84 and, if so, the amount of bonds to be issued and sold. Successive issues of bonds may be authorized and sold to carry out those actions progressively, and it is not necessary that all of the bonds be issued or sold at any one time.