In the restricted procedure public tender relating to the porterage service, industrial cleaning, waste handling care of the Ravenna waste disposal and treatment plants, for a tender amount of around Euro period of two years, of the 60 points reserved for the technical component, 15 points were reserved for social sustainability (possession of OHSAS18001 certification and control on the accident rate applied) and 25 points were reserved for environmental sustainability (possession of ISO 14001 environment certification, age and impact of vehicles used).