Einsatz von Direct Push im Rahmen von Sanierungsuntersuchungen – Fallbeispiel Elsterwerda (Brandenburg) | Application of Direct Push techniques for delineation of vertical variations in hydrochemistry at remediation sites—case study Elsterwerda (Brandenburg)
2012
Radny, Dirk | Leven, Carsten | Flachowsky, Johannes | Scheytt, Traugott | Dietrich, Peter
Monitoring of ground water for remediation projects is usually done using conventional ground water sampling. However, vertical variations in hydrochemistry cannot be detected well with this approach and, as a result, can create serious problems. Such problems were observed at the Elsterwerda site in Brandenburg where a spill of about 470 t of unleaded gasoline contaminated the Quaternary aquifer in 1997. Despite the installation of an increasing number of monitoring wells during site remediation, evaluation of the spatial development of the plume was not possible. Direct Push ground water sampling was therefore used to obtain depth-dependent hydrochemistry information for the design of additional monitoring wells. A mobile gas chromatograph enabled an adaptive site investigation that allowed on-site determination of the appropriate depths and lengths of the screened intervals for small-diameter multichannel monitoring wells. The installation of these multichannel wells provided reproducible, depth dependent information on site hydrochemistry. The investigations at the Elsterwerda site demonstrated the power of direct push technology and showed that simple cleaning of the Direct Push rods and the use of a new sampling tube for each profile eliminates potential cross contamination.
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