This technical description concerns the project “Urban Solid Waste Processing Unit and Pre-selected Organic Waste in OEDA Northeast Attica” which will be constructed at the location “Black Mountain” Grammatiko, within the administrative boundaries of the Municipality of Marathon. The project is located on a plot of a total area of approximately 510.000 m², in which a landfill has already been constructed for the disposal of residual waste with the necessary accompanying projects.The Urban Solid Waste Treatment Plant (ASA) will have a total capacity of 60,000 tonnes of mixed waste per year. In addition, the construction of a plant for the processing of pre-selected Organic Waste with a capacity of 20,000 tonnes per year is planned.