Cal. Gov. Code § 43638
When municipal improvements are being made pursuant to this article, the legislative body shall make all necessary regulations for carrying out and maintaining the improvements and appoint all necessary agents to look after the construction and operation of improvements.
The board of public works shall perform these duties in cities having freeholders' charters providing for such a board.
The legislative body may contract with a specially qualified person, firm or corporation to act as fiscal agent. Such contracts may authorize the fiscal agent to act as agent for any city officer or employee in the performance of any duty required to be performed, or in taking any action authorized to be taken in connection with bonds issued pursuant to this chapter.
Ca. Gov. Code § 43638