California Code, Civil Code - CIV § 799.56

(a) The 72-hour written notice shall be served by delivering a copy to the defaulting occupant personally or to a person of suitable age and discretion who is occupying the recreational vehicle located on the lot.  In the latter event, a copy of the notice shall also be affixed in a conspicuous place on the recreational vehicle and shall be sent through the mail addressed to the occupant at the place where the property is located and, if available, any other address which the occupant has provided to management in the registration agreement.  Delivery of the 72-hour notice to a defaulting occupant who is incapable of removing the occupant's recreational vehicle from the park because of a physical incapacity shall not be sufficient to satisfy the requirements of this section.

(b) In the event that the defaulting occupant is incapable of removing the occupant's recreational vehicle from the park because of a physical incapacity or because the recreational vehicle is not motorized and cannot be moved by the occupant's vehicle, the default shall be cured within 72 hours, but the date to quit shall be no less than seven days after service of the notice.

(c) The management shall also serve a copy of the notice to the city police if the park is located in a city, or, if the park is located in an unincorporated area, to the county sheriff.