573.1.3.A municipality may, in a contract awarded in accordance with section 573 or 573.1 involving the transport of bulk material, stipulate that small bulk trucking enterprises subscribing to the brokerage service of an association holding a brokerage permit issued under the Transport Act (chapter T‐12) shall participate in the performance of the contract in the proportion and on the conditions determined by the municipality, in particular as regards the applicable tariff.