Cal. Pub. Cont. Code § 20431

At any time within 10 days from the date of the first publication of the notice of award of the contract, any owner of, or other persons having any interest in, any lot or land liable to assessment, who claims that any of the previous acts or proceedings relating to the work are irregular, defective, erroneous or faulty, may file with the clerk a written notice specifying in what respect the said acts and proceedings are irregular, defective, erroneous or faulty. The notice shall state that it is made pursuant to this section.