California Code, Health and Safety Code - HSC § 4607

Whenever the governing body of a city determines that the public interest or convenience requires the making of any improvement in any part of the territory of the city, it may pass a resolution to that effect.  The resolution shall be passed by a vote of at least two-thirds of the members of the governing body.  It shall describe the improvement in general terms.  For the purpose of such description, reference may be made to maps, plats, plans, or other documents on file in the office of the clerk of the city.  Any improvements may be combined into a single project, the indebtedness for which is to be submitted to the electors as a single proposition.

The resolution shall also contain the total dollar amount of a general estimate of the costs and expenses of the proposed improvement.  In arriving at such estimate, the governing body may include the estimated amounts of any or all of the items which are set forth in Section 4625.  The resolution need not, however, itemize or separately state any of the items included in the costs and expenses.