A dispute that arises in the performance of a procurement contract which is not resolved by agreement of the parties shall be decided in writing by the Executive Director. The decision of the Executive Director is final and conclusive unless, within 10 calendar days of receipt of a copy of the decision, the contractor delivers a written appeal to the Executive Director. In connection with an appeal, the contractor shall be given an opportunity to be heard and to offer evidence in support of the contractor’s position. The decision by the Executive Director binds the contractor, and the contractor shall abide by the decision.