If the county elections official certifies that the percentage of registered voters signing the petition is less than that required by Section 101284, a supplemental petition may be presented to the secretary of the district within 30 days after the county elections official’s certification of the first petition. The supplemental petition shall thereupon be processed as provided in Sections 101284 and 101285.
Source:
Section 101287, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=101287..