Where a concession contract covers both an activity referred to in b of 2° of article R. 3126-1 and another service activity, it is awarded:
1° In accordance with the rules applicable to its main purpose where this other service activity is not covered by this chapter. The main purpose of the contract is determined on the basis of the highest estimated value of these respective activities;
2° In accordance with the rules applicable to contracts covered by b of 2° of article R. 3126-1 when the other activity is also covered by the same article.