IR IKS and ReTrans Midt AS shall enter into a Framework Agreement for the procurement of sanitation vehicles. A comprehensive description of the delivery is given in the tender documentation. Estimated volume of the Framework Agreement: the estimated volume during the agreement period is approx. 10 — 30 units. Continuous evaluations are made on whether or not the Contracting Authority shall procure diesel-powered refuse collection vehicles or biogas-operated vehicles. The assessments for selecting refuse collection vehicles shall be made in connection with each individual call-off, based on where and what the different refuse collection vehicles shall be used for.