The member of the board of supervisors appointed pursuant to subdivision (a) of Section 120050.2 shall represent one of the two supervisorial districts with the greatest percentage of its area within the incorporated area of the County of San Diego within the area under the jurisdiction of the transit development board as defined in Section 120054.
Source:
Section 120051, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=120051..