(a) A port commission may change the plans, specifications, proposal, or quantities of items purchased after a contract has been awarded, but the total contract price may not be changed unless the cost can be paid from available funds.
(b) If a change order involves an increase or decrease in cost less than or equal to the amount authorized in Section 60.403(a) for routine purchases or contracts, a port commission may grant general authority to an employee to approve the change order. However, the original contract price may not be increased by more than 25 percent or decreased by 18 percent or more without the consent of the contractor.