In this study, samples from different waste depths were collected during new vertical gas well constructions as replacements of deformed wells due to landfill settlement or pipe clogging. The
wells were bored with a drilling rig operated in auger mode with a borehole diameter of 800 mm and height of 1500 mm. Hence,the maximum drilling depth was decided as 35 m in order to obtain samples from three waste depths (10, 20 and 30 m) for a representative waste characterization study. For each waste depth in every sampling point only one sample could be taken in order to
comply with study budget constraints. Samples were collected from 12 locations representing the landfill as much as possible with respect to waste age and landfill sections. The aim was to
divide the samples roughly into older (cLF) and fresher (aLF) samples representing different landfilling periods of the entire landfill.Since more problematic LFG generations occur in cLF section according to information given by operator, it was decided to take more samples from this section. 27 samples from 9 sampling points at cLF and 9 samples from 3 sampling points at aLF were planned for this study. All planned samples were successfully taken except the sample EN7-30. The volume of each sample was ensured by using a metal box having a 500 L volume. The average weight of taken samples was measured between 250 and 380 kg,hence, the average waste density was around 0.50–0.76 t/m3.