Cal. Sts. & High. Code § 22083

A proceeding for the planting, maintenance, or removal of trees may also be instituted by a petition to the council of property owners whose property will be among that to be assessed to pay the cost of the proposed improvement. Upon such petition being filed the city forester shall file with the city council a diagram similar to the one accompanying a written proposal of the board for similar improvements, which shall describe the improvement proposed by the petition.