Uncontrolled landfills comprise one of the most important topics with regard to solid waste management (SWM) in Greece. The environmental impact of these landfills is closely related to some characteristics, namely the composition and quantity of the disposed solid wastes and the conditions that control the physicochemical processes inside the waste volume, which determine the rehabilitation plan. The objective of this paper is to present a methodology for obtaining these crucial data. The definition of the necessary information and the choice of the appropriate measurements have proved to be the key factors in solving the problem of non-conformity and absence of data without wasting time and money.
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