The Schedule & Cost Control On Call Services Consultant (Consultant) will assist the Authority in monitoring and will be responsible for determining the accuracy, completeness, and the impact of past and potential issues associated with the contractor’s schedule. The master, look ahead and monthly schedule updates shall be reviewed for both cost and time impacts. The Consultant is also responsible for assisting the GCRTA Resident Engineer (RE) in the change order process by providing independent estimates and review of contractor cost proposals as needed. The consultant will also assist the RE in reviewing contractor invoices. Finally, the Consultant will assist in project closeout to ensure that change orders and the final contract sum have been resolved completely and accurately.