The Project consists of the construction of a wastewater collection and conveyance system for the east part of the city of Mexicali B.C . It also includes the expansion of the Las Arenitas WWTP, which is a lagoon system. In particular, the project will be implemented in the zone identified as Mexicali IV. The project comprises 26.21 Km of sewer lines, with diameters ranking between 200 mm and 450 mm, two lift stations, a pump station, and a force main of 910 mm diameter and 21 km long that will convey the wastewater to the “Las Arenitas” WWTP.