Cal. Pub. Util. Code § 132302
The commission, in the ordinance, shall state the nature of the tax to be imposed, the tax rate or the maximum tax rate, the purposes for which the revenue derived from the tax will be used, and may set a term during which the tax will be imposed. The purposes for which the tax revenues will be used may include, but are not limited to, the administration of this chapter, including legal actions related thereto, the construction, capital acquisition, maintenance, and operation of streets, roads, and highways, including state highways, and the construction, maintenance, and operation of public transit systems, including exclusive public mass transit guideway systems. These purposes include expenditures for the planning, environmental reviews, engineering and design costs, and related right-of-way acquisition. The ordinance shall contain an expenditure plan which shall include the allocation of revenues for the purposes authorized by this section.
Ca. Pub. Util. Code § 132302