Public Resources Code § 5507
ARTICLE 3. Regional Park, Park and Open-Space, and Open-Space Districts
If the clerk’s certificate or certificates indicate that the petition has been properly signed, the board of supervisors of the county or counties not having the largest area within the proposed district shall, by resolution, fix a time and place for a hearing upon the question whether the territory described within the boundaries of its county will be benefited and should be included in the proposed district.