In the negotiated public procedure for the entrusting of the creation as a whole of the works for the enhancement of the gas and water ridges (IV type) located in Pievesestina and realisation of pressurised sewage collectors and adaptation of the pumping plant for collection at the treatment plant in Via Calcinaro of the waste sewage networks for the districts of Pievesestina and Borgo Pievesestina for a tender amount of around Euro components, 5 points were reserved for social sustainability aspects (accident & injury trend and possession of OHSAS 18001 certification), 2 points for environmental sustainability (possession of ISO 14001 certification), and 23 points for technical aspects linked to the experience of the staff and execution timescales.