The project concerns the necessary work for the final formation and waterproofing of the A3 and A4 cells of the Landfill of Mavrorachi of the Regional Unit (Nomos) of Thessaloniki. It aims to serve the needs of all the municipalities of the Prefecture of Thessaloniki, as well as in part of the Municipality of Veria, which is also served by the Kozani Landfill.The basin of Mavrorachi Landfill has an area of 377 acres and includes 4 individual basins (A1, A2, A3 and A4). The A1 and A2 cells have already been built and operated since 2008 and are now saturated, while the A3 and A4 cells are under construction (the A3 hive has already been given for disposal at its bottom). The capacity of the landfill is approximately 14900000 m².