Colorado Revised Statutes Title 13. Courts and Court Procedure § 13-22-209. Initiation of arbitration

(1) A person may initiate an arbitration proceeding by giving notice in a record to the other parties to the agreement to arbitrate in the agreed manner between the parties or, in the absence of an agreement, by certified or registered mail, return receipt requested and obtained, or by service as authorized by law for the commencement of a civil action. The notice shall describe the nature of the controversy and the remedy sought.

(2) Unless a person objects to the lack of notice or the insufficiency of notice under section 13-22-215(3) not later than the beginning of the arbitration hearing, a person who appears at the arbitration hearing waives any objection to the lack of notice or insufficiency of notice.