in the negotiated procedure tender, originating from the qualification system call, for the annual entrusting of the scheduled maintenance work, network extension, connections and accessory services (for example plant engineering distributed on the networks) in the water, sewage, district heating and gas commodity sectors to be carried out in the area managed by Hera S.p.A. involving a maximum amount, per individual adjudication, of Euro area), for a total tender amount of Euro 30.2 million.