1) when was award received?
2) when was contract terminated?
3) if contract has been terminated on account of disputes between parties you can invoke arbitration clause under the contract
4) arbitration would be maintainable as it is in respect of fresh cause of action .
5) earlier arbitration has no co relation with subsequent dispute that arose between parties on termination of contract .
6) invoke the arbitration clause and appoint your arbitrator . if the other party refuses to do so move court for appointment of arbitrator on his behalf
7) inorder to save costs single arbitrator can be appointed by court