The award procedure for concession contracts shall be governed by this Decision subject to the following modifications:

1. (a)

   the calculation of the estimated value of concession contracts shall take account of the estimated total turnover, net of VAT, generated by the contractor through the performance of the concession contract during its term;

2. (b)

   concession contracts shall always be limited in term. The duration shall not exceed the period that a concessionaire could reasonably be expected to take to recoup the investments made and to obtain a financial return.