If a dispute should arise between the contractor and the government agency over the payment of retainages and final payment, then the dispute shall be arbitrated under the applicable terms of the contract. If the contract contains no provision for arbitration, then both parties may mutually agree to arbitrate the dispute under the rules of the American Arbitration Association or in accordance with 42 Pa.C.S. Ch. 73 (relating to arbitration). In any event, either party shall have the right of appeal from any decision and award as provided by law.