Section 10240.9 Of Article 7.1. Resolution Of Contract Claims From California Public Contract Code >> Division 2. >> Part 2. >> Chapter 1. >> Article 7.1.

. A party to the contract may join in the arbitration as a party, any supplier, subcontractor, design professional, surety, or other person who has so agreed and if the joinder is necessary to prevent a substantial risk of the party otherwise being subjected to inconsistent obligations or decisions.