Cal. Public Utilities Code § 120481

(a) The board, 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, the portion of the area of the board to which the tax would apply, and may set a term during which the tax will be imposed. The purposes for which the tax revenues may be used shall be limited to public transit purposes serving the area of jurisdiction of the board, as determined by the board, including the administration of this division and legal actions related thereto. These purposes include expenditures for planning, environmental reviews, engineering and design costs, and related right-of-way acquisition. The ordinance shall contain an expenditure plan that shall include the allocation of revenues for the purposes authorized by this section. (b) As used in this section, “public transit purposes” includes the public transit responsibilities under the jurisdiction of the board as well as any repair, redesign, or ongoing maintenance of a right-of-way upon which transit is intended to travel, or any bikeway, bicycle path, sidewalk, trail, pedestrian access, or pedestrian accessway.