CAL. GOV. CODE § 11518.5 : California Code - Section 11518.5

(a) Within 15 days after service of a copy of the decision on a party, but not later than the effective date of the decision, the party may apply to the agency for correction of a mistake or clerical error in the decision, stating the specific ground on which the application is made. Notice of the application shall be given to the other parties to the proceeding. The application is not a prerequisite for seeking judicial review.

(b) The agency may refer the application to the administrative law judge who formulated the proposed decision or may delegate its authority under this section to one or more persons.

(c) The agency may deny the application, grant the application and modify the decision, or grant the application and set the matter for further proceedings. The application is considered denied if the agency does not dispose of it within 15 days after it is made or a longer time that the agency provides by regulation.

(d) Nothing in this section precludes the agency, on its own motion or on motion of the administrative law judge, from modifying the decision to correct a mistake or clerical error. A modification under this subdivision shall be made within 15 days after issuance of the decision.

(e) The agency shall, within 15 days after correction of a mistake or clerical error in the decision, serve a copy of the correction on each party on which a copy of the decision was previously served.