California Code, Streets and Highways Code - SHC § 11309

Any objections or protests, whether to the things proposed by the resolution of intention or to any changes proposed pursuant to Section 11308, not made at the time and in the manner provided by this part are deemed voluntarily waived, and the proceedings hereunder shall not be attacked on any ground not stated in a written objection filed as provided in this part. Except in the case of a majority protest, as provided in Section 11306, or Section 11307, the legislative body may sustain or deny any or all objections or protests and its determination is final.