Union Referral to Arbitration. Failing satisfactory settlement at Step 3 or upon expiration of the fifteen (15) day period referred to in Step 3 of the grievance procedure, the Union may refer the grievance to arbitration under Article 26.
Union Referral to Arbitration. Failing satisfactory resolution or upon expiration of the fifteen (15) day period referred to in the grievance procedure, the Union may within sixty (60) calendar days refer the grievance to arbitration.