1047 To fill the geocells, a long-arm backhoe was used to dump soil that had been previously placed on flat areas onto the cells and then spread it along the sloped surface, maintaining the 300 mm thickness required in the project. Figure 15 - Filling and spreading soil over the geocells. In sections where vehicle traffic was necessary on the slopes, additional reinforcement was considered through the application of a second layer of geogrid, so that the geosynthetic coating could support the additional loads without compromising the stability of the cover. Once the soil filling was completed, the vegetation planting process began, as specified in the project, where the thickness of the soil layer allowed for vegetative development and avoided interference with the drainage and waterproofing system. Figure 16 - Finalized coverage, with soil layer implementation and early vegetation development and vegetation cover. 4. CASE HISTORY Nº3 - ASH DUMP CLOSURE COVER, TARAPACÁ, IQUIQUE, I REGIÓN, CHILE 4.1 Background The plant is located 65 km south of the city of Iquique, on the coast of the Tarapacá Region, between the towns of Patillos and Punta Patache. In hydrographic terms, it corresponds to the coastal basin sector between Tiliviche and Loa (Figure 17). The landfill site is located approximately 7.5 km northeast of the plant, in a natural depression between the coastal massif and Route A1. The site is located 2 km from the Pacific Ocean coast in a desert area with no vegetation. It covers an area of approximately 53 hectares with
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