- Lot I: drafting of the project for the expansion and improvement of the Gibraleón WWTP (Huelva),

- Lot II: drafting of the project for the grouping of discharges and purification in various centers of Aracena (Huelva),

- Lot III: drafting of collector and WWTP projects in several municipalities in the northern part of the province of Huelva,

- Lot IV: drafting of projects for the grouping of effluents and purification of Villanueva de las Cruces and Castaño del Robledo and for the expansion of the WWTP of Cortelazor y los Marines (Huelva).

The technical assistance services contract will include the drafting of the construction project of the works necessary for the execution of the expansion and improvement of the Gibraleón WWTP.

The project will include the definition of the works necessary for the expansion and improvement of the group of wastewater discharges (if necessary) and the WWTP in which the wastewater of the Gibraleón population will be treated and the subsequent discharge to the receiving environment under the quality conditions required by current legislation.

The technical assistance services contract will include the drafting of the construction project (s) of the works necessary for the adequate treatment of urban wastewater in various population centers of the municipality of Aracena, specifically, Carboneras, Castañuelos, Corterrangel, Jabuguillo and La Umbria, including all the necessary elements for it.

The project (s) will include the definition of the works necessary for the grouping of wastewater discharges and the WWTP in which the wastewater from the nuclei of Carboneras, Castañuelos, Corterrangel, Jabuguillo and La Umbría will be treated. and the subsequent discharge to the receiving environment under the quality conditions required by current legislation.

The technical assistance services contract will include the drafting of six projects, one for each of the following urban agglomerations:

1) Santa Olalla del Cala;

2) Arroyomolinos de León;

3) Cañaveral de León;

4) Fennels;

5) Cumbres de Enmedio and;

6) Summits of San Bartolomé.

In these projects, the necessary works for the execution of the adequate treatment of urban wastewater of said municipalities will be defined, including all the necessary elements for this.

Each of the projects will include the definition of the works necessary for the expansion and improvement of the group of wastewater discharges and the WWTP in which the wastewater of each of the municipalities will be treated, namely: Santa Olalla del Cala, Arroyomolinos de León, Cañaveral de León, Hinojales, Cumbres de Enmedio and Cumbres de San Bartolomé, and the subsequent discharge to the receiving environment under the quality conditions required by current legislation.

The technical assistance services contract will include the drafting of four projects, one for each of the following urban agglomerations:

1) Villanueva de Las Cruces;

2) Castaño del Robledo;

3) Cortelazor and;

4) The Marines.

In these projects, the necessary works for the execution of the adequate treatment of urban wastewater of said municipalities will be defined, including all the necessary elements for this.

Each of the projects will include the definition of the works necessary for the expansion, adaptation and / or necessary improvement of the group of wastewater discharges and / or the WWTP in which the wastewater of each of the municipalities will be treated. , namely: Villanueva de Las Cruces, Castaño del Robledo, Cortelazor and Los Marines, and the subsequent discharge to the receiving environment under the quality conditions required by current legislation.