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Aerial view of the disposal site of Vall d'en Joan

Aerial view of the disposal site of Vall d'en Joan

Operations at the controlled depot at Vall d'en Joan - Garraf - have been carried out since the beginning by TIRSA, the company which holds the concession for this service, in accordance with the stipulations of Decree 1/1997, dated 7 January, regarding the disposal of waste in controlled depots, and observing compliance with Royal Decree 1481/2001, dated 27 December, which brings Spanish regulations into line with EC Directive 1999/31/CE, dated 26 April 1999, relating to the disposal of waste at landfill sites.

Currently, the only zone being operated for the dumping of municipal waste is zone 4, with an approximate surface area of 30 hectares, within the municipal district of Begues. In accordance with the forecasts of the PMGRM, the disposal of mass municipal waste will be maintained at most until 31 December 2006.

The operation system used is defined by filling the deposit vessel in cells that are kept isolated from each other by using a layer of compacted earth. Only the cell that is in the process of being filled maintains the face of the mass of waste uncovered, thus constituting the so-called front of exploitation.

The distribution and morphology of the set of cells responds to a predefined structural configuration based on the formation of terraces, supported by retaining walls to ensure the stability of the mass of waste, minimising erosion processes and facilitating and improving the later work of sealing and restoration.

Annually, and due, amongst other factors, to the topographical lifting of the landfill in the controlled depot that is carried out regularly, the Operations Plan is produced, determining by half-years the corresponding tasks and areas of operation.

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