California Code, Code of Civil Procedure - CCP § 1284

The arbitrators, upon written application of a party to the arbitration, may correct the award upon any of the grounds set forth in subdivisions (a) and (c) of Section 1286.6 not later than 30 days after service of a signed copy of the award on the applicant.

Application for such correction shall be made not later than 10 days after service of a signed copy of the award on the applicant.  Upon or before making such application, the applicant shall deliver or mail a copy of the application to all of the other parties to the arbitration.

Any party to the arbitration may make written objection to such application.  The objection shall be made not later than 10 days after the application is delivered or mailed to the objector.  Upon or before making such objection, the objector shall deliver or mail a copy of the objection to the applicant and all the other parties to the arbitration.

The arbitrators shall either deny the application or correct the award.  The denial of the application or the correction of the award shall be in writing and signed by the arbitrators concurring therein, and the neutral arbitrator shall serve a signed copy of such denial or correction on each party to the arbitration personally or by registered or certified mail or as provided in the agreement.  If no denial of the application or correction of the award is served within the 30-day period provided in this section, the application for correction shall be deemed denied on the last day thereof.