Challenge achieved: The execution of a main collector and six additions for the collection of the neighborhoods of Lambarri, Sologutxi and Lasier, such as the Osotu School and Muebles Bizkaia. The execution of a separate collector is required to incorporate and link the Lambarri neighborhood with the primary sanitation network and to incorporate the networks of the Lasier, Sologutxi and Muebles Bizkaia neighborhoods.