Expedited Arbitration (a) The Parties may by mutual agreement refer to expedited arbitration any outstanding grievances considered suitable for this process, and shall set dates and locations for hearings of groups of grievances considered suitable for expedited arbitration. (b) All grievances shall be considered suitable for and resolvable by expedited arbitration except grievances in the nature of: (1) dismissals; (2) rejection on probation; (3) suspensions in excess of twenty (20) workdays; (4) policy grievances; (5) grievances requiring substantial interpretation of a provision of the Collective Agreement; (6) grievances requiring presentation of extrinsic evidence; (7) grievances where a Party intends to raise a preliminary objection; and