Section 5254 Of Article 6. Proceedings From California Public Utilities Code >> Division 2. >> Chapter 7. >> Article 6.

. Service by personal delivery is complete upon delivery to the person to be served of a true copy of the paper to be served. Service by mail is complete upon the expiration of four days after the deposit of the notice. Proof of service may be made by the certificate of any officer or employee of the commission or the affidavit of any person over the age of 18 years, naming the person served and specifying the time, place, and manner of service.